5: 01- II , _□ ; ru • m | un 'i O E O i r^ ï O : m i O THE DECAPODA OF THE SIBOGA EXPEDITION PART II Family ALPHEIDAE Sib o ga-Exp editie XXXIX a' THE DECAPODA OF THE SIBOGA EXPEDITION PART II Family ALPHEIDAE BY DR J. G. DE MAN Ierseke (Holland) late E. J BRILL PUBLISHERS AND PRINTERS LEYDEN — 191 1 '?* 3 TO THE MEMORY OF HIS HIGHLY ESTEEMED AND BELOVED PARENTS THIS WORK IS DEDICATED BY THE AUTHOR. PART II Family ALPHEIDAE It is especially to the important investigations of Professor Coutière that science is indebted for the fact that our knowledge of the Family Alpheidae has increased to such a great extent, not only as regards the morphology and the biology of these interesting animals, but also in view of the considerable number of new genera, new species and new varieties with which he has made us acquainted. Coutière also first called attention to the great importance of the relative measurements of the thoracic appendages and of the telson as specific characters, characters that previously had been overlooked by the carcinologists and it was just by means of these new characters, that often specimens of small size of Alpheiis or Synalpheus proved to belong to species that were still unknown, while formerly such specimens usually would be regarded as juvenile forms or at most as varieties. At present not less than 19 genera are included in this family, one of which, however, Racilius Paulson, is regarded by Coutière as doubtful, while the genus Parathanas Sp. Bate has been created for specimens that apparently were still in a larval stage. The genus Aretopsis is the only new one, discovered by this expedition. Excepting the old genus Alphcus and the genus Synalpheus, that previously was united with the former, all these genera are represented by few species and nine of them even by one species only. The genera Alpheus, Synalpheus, Ogyris, Automate, Alphcopsis, Betacus, Joiisseaumea and Athanas are distributed not only over the Indopacific region, but occur also in the Atlantic or on the coasts of America, the Mediterranean or the Black Sea and Alpheopsis Haugi Cout. inhabits a freshwater lake of the French Congo at 200 kil. from the sea. The other genera of this family are confined to the Indopacific region. While all the first mentioned genera were collected by the "Siboga", of the latter only Arete and Aretopsis have been observed. As regards the distribution of the other genera, we know that Athanopsis Cout., Pterocaris Heller, Parabetaeus Cout., Amphibctacus Cout. and Raeilius Paulson have up to the present time only been observed in the Red Sea or at Djibouti ; the remarkable genus Cheirothrix that was discovered by the "Challenger", occurs at Cape York, the genus Alpheinus Borr. at the Loyalty Islands and Metabetaeus, finally, is still only known from the island of Funafuti. The three last named may perhaps once prove to exist also in the East Indian Archipelago, like also the two species of Parathanas Sp. Bate, that occur at the Philippine Islands. 1 SIHOGA-EXPEDITIE XXXlXr!1. '° Ó48J6 '34 Total number of indopacific species and varieties known at present. Total number of species and varieties collected by the "Siboga". Total number of new species and varieties. Ogyris Stimps Automate de Man Athanas Leach Parathanas Sp. Bate .... Athanopsis Cout Jousseaumca Cout Amphibctaeus Cout Arete Stimps Aretopsis de Man Betaeus Dana Parabetaeus Cout Metabetaeus Borr Alpheopsis Cout Pterocaris Heller Cheirothrix Sp. Bate .... Alpheimis Borr Synalpheus Sp. Bate .... Alpkeus Fabr Racilius Paulson Total 2 sp. 5 sp. 12 Sp. , 1 var. 2 sp. I sp. 5 sp. i sp. 6 sp., 1 var. i sp. 3 sp. i sp. i sp. 8 sp., 1 var. i sp. i sp. i sp. 62 sp. 15 var. 128 sp. , 19 var I sp. 142 sp., 37 var. 1 sp. 2 sp. 5 sp. 2 sp. sp., 1 var. 1 sp. 1 sp. 4 SP- 38 sp., 9 var. 57 sp., 10 var. 1 sp. 1 sp. 4 sp. 2 sp. 1 sp., 1 var. 1 sp. 1 sp. 4 sp. 22 sp., 7 var. 20 sp., 9 var. 1 13 sp., 20 var. 57 sp., 17 var. Ogyris Stimps. The remarkable genus Ogyris, distinguished by its elongate and slender eye-peduncles from all other Alpheidae, was hitherto represented by one indopacific and two atlantic species; a fourth, O. Sibogae, has been collected by this expedition. This species with its quadriarticulate carpus appears closely related to O. occidentalis from the mouth of the river Tocantins, but it differs by the smaller number of teeth on the dorsal carina of the carapace and by the shape of the telson. Ogyris Sibogac was collected in rather deep water off the Sulu Islands and also probably inhabits the Saleh-bay, Sumbawa, though the specimen from the latter locality may perhaps once prove to belong to a distinct species. O. orientalis Stimps. has been observed in the China Sea and in the Bay of Kagoshima. Of the american species, one inhabits the coast of Virginia, the other the mouth of the river Tocantins. Key to the species of the genus Ogyris. ax Carpus of second pair of legs triarticulate. è1 Carapace smooth, without dorsal carina ; rostrum very small . . alphaerostris Kingsley (J. S. KINGSLEY, in: Proc. Acad. Nat. Scienc. Philadelphia, 1879, p. 420, PI. XIV, Fig. 7). b2 No rostrum, but the carapace with a dorsal carina armed with 4 or 5 small teeth orientalis Stimps. (W. STIMPSON, in: Proc. Acad. Nat. Scienc. Philadelphia, 1860, p. 36). a„ Carpus of second pair of legs quadriarticulate. Rostrum present, small. bx Dorsal carina of carapace with 7 — 9 teeth. Lateral margins of telson without a prominence occidentalis Ortm. (A. ORTMANN, in: Ergebnisse der Plankton-Exped. II, Kiel und Leipzig, 1893, p. 46, Taf. III, Fig. 4). b„ Dorsal carina of carapace with 4 teeth. Lateral margins of telson with an obtuse prominence just before the middle Sibogae de Man f 1. Ogyris Sibogae de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 19 10, p. 31S. Stat. 102. July 1. 6°4'.i N., I20°44'E. Sulu-Sea. 535 m. Fine, yellow sand. Dredge full of fine yellow sand; nearly no animals. 1 specimen. Stat. 313. February 14/16. Anchorage East of Dangar Besar, Saleh-bay. Depth up to 36 m. Sand, coral and mud. 1 specimen. This species closely approaches to O. occidentalis Ortm. from the mouth of the river Tocantins. The following description is drawn from the adult specimen collected at Stat. 102, 3 136 but the corresponding measurements of the other, that has a much smaller size, are placed in parenthesis. Rostrum triangular, acute, twice as long as wide in the middle, reaching a little bevond the extra-orbital angles, its lateral margins diverging backward and beset with short setae ; the upper side which is slightly curved downward, bears three longer setae near the tip. In a lateral view the straight, lower margin of the rostrum appears to run horizontally forward. The rostrum is continued backward as a low, rounded crest or carina that extends to the middle ot the carapace, gradually disappearing ; the crest bears f o 11 r spiniform teeth, the first or hindmost is the smallest, the second and the fourth are of equal length, one and a half as long as the first, while the third is slightly longer than the second or the fourth. External angles of the orbits rounded; at a short distance beneath them, the antero-lateral margin which is also fringed with short setae, bears a small, subacute prominence that probably represents the antennal tooth. Pterygostomian angle obtuse. The carapace is distinctly pubescent anteriorly, perhaps also posteriorly. Abdominal pleura rounded posteriorly, except those of the 6lh segment that are acute, though n o t articulate or movable ; this 6th segment appears elongate with a rounded upper border and just twice as long as thick, when looked at from above. Telson as in O. occidentalis, but the lateral margins bear, just before the middle, an obtuse prominence or tooth, which in the species from the river Tocantins is apparently wanting (A. Ortmann, l.c. Fig. 4,:). The length of the telson equals 3,4-times the width of the posterior margin, i. e. the distance between the postero-lateral angles, and the proportion betvveen this distance and the width at the base is 1,76. Posterior margin as in O. Occidental is, very prominent and rounded, its length being three-fifths the distance between the postero-lateral angles ; the longer, internal spinules reach as far as the extremity of the telson, but the outer are very short. The spinules of the upper surface are small, measuring one-sixth the width of the posterior margin and are rather far remote from the lateral margins; those of the anterior pair are implanted in the middle, those of the posterior just twice as far from the end of the telson as from the anterior pair. The outer uropods of the caudal fan are much longer than the telson, narrow, curved outward and their extremity is acute ; the inner are still narrower, obtuse at the tip and reach to midway between the end of the telson and that of the outer uropods. Unfortunately in this mutilated specimen the third antennular article with the flagella, as well as the antennal flagella are missing. The very slender eye-peduncles, that are thickened at both extremities, reach with half the length of their black, facetted eyes beyond the extremity of the second antennular article, but they are almost as much shorter as the carpocerite as the eyes are long; the eye-peduncles are a little less than half as long as the carapace, the length of the latter being in proportion to that of the peduncles as 1 : 0,43. The first or basal anten- nular article reaches to the middle of the eye-peduncles and, measured from the base of the rostrum to the end of the article, appears just twice as long as the second or median article, which is nearly 3-times as long as thick and rather slender. Like in O. occidentalis Ortm. the stylocerite terminates in two strong, acuminate spines ; the outer spine reaches to the distal fifth part of the basal antennular article, the inner is a little shorter and slightly directed upward. 4 137 Basicerite armed at the infero-external angle with two small, acute spines of equal length. Carpocerite slender, 5-times as long as thick and probably about as long as the antennular peduncle. Scaphocerite small, hardly reaching beyond the middle of the carpocerite, semi-elliptical ; its distal extremity is acute, though it does not terminate, as usually, in a tooth, more or less distinct from the scale and the scaphocerite reaches as far forward as the distal end of median antennular article. The two last joints of the external maxillipeds are missing, the long and slender, ante- penultimate joint extends to the apex of the second antennular article. The legs of the first pair are equal, feeble and resemble those of O. occidentalis. The short ischium shows a small notch or emargination near the base of the lower margin. Merus slender, unarmed, 5,1 (4,3)- times as long as wide, with a few setae on the lower margin. The carpus that gradually thickens towards the distal extremity, is but very little longer than the merus and 5,3 (4,2)- times as long as thick at the distal end. The carpus bears some long, fine setae and one observes more numerous, shorter, and feathered setae distally, at the inner side. Chelae small, their length measuring five-sevenths (six-sevenths) of the carpus, they are turned outward, the dactylus being external ; fingers slightly gaping, one-third (five-sevenths) longer than the palm, which is almost one and a half as long as broad. The palm is slightly wider near the articu- lation of the fingers than proximally and is deeply emarginate along the proximal half of its inner border; there are many short, feathered setae near that emargination, on the lower surface. The fingers, the pointed tips of which are crossing one another, show entire cutting- edg-es that are unarmed and the fingers bear the usual tufts of setae. Ischium of second legs with a small notch at the base of the lower margin. Merus slender, 9 (7,6)-times as long as wicle in the middle and appearing at the proximal extremity less broad than in the middle and distally. Carpus 1,27 (i,32)-times as long as the merus, fou r-j o in ted, as in O. occidentalis-, the segments are 1,34 (0,98) mm., 0,36 (0,3) mm., 0,3 (0,22) mm. and 0,54 (0,42) mm. long. The carpus gradually thickens from the proximal to the distal extremity ; the first segment, hardly longer than the sum of the three following, is slender, 7 (7)-times as long as thick at its distal extremity, the third is the shortest of all, the fourth one and a half as long as the second. Chela just as long as that of the first pair, viz. 1,1 (0,76) mm., twice as long as the fourth segment of the carpus; fingers one-fifth (one-third) longer than the palm. Ischium of third legs with a movable spine near the middle; merus nearly of the same length, 4 (3)-times as long as wide distally and also armed with a movable spine on the lower margin near the truncate, distal extremity. This joint and the two following show these dimensions: merus 1,42 (1,21); carpus i; propodus 0,58 (0,66). Carpus 3 (3)-times as long as thick; propodus compressed, twice (2,2-times) as long as wide at its base, its margins fringed with long, feathered setae that extend beyond the extremity of the dactylus. Dactylus about as long, not shorter (in the other specimen a little shorter) than the propodus, straight and slender, 8-times as long as broad, with a few setae at the tip. The ischium, the merus and the carpus are also beset with feathered setae, on the carpus on the upper border only. Legs of the fourth pair more slender than those of the third. Merus longer than the 5 133 preceding joint, slender, 6,6 (6,2)-times as long as wide at the distal end; relative dimensions : merus 1,75 (1,6); carpus i; propodus 0,96 (0,9). Carpus 4,4 (4,5)-times as long as broad, presenting the same width almost along its whole length; propodus 6 (5,6)-times as long as wide in the middle and gradually narrowing. Dactylus measuring three-elevenths (one-third) of the propodus, 6 (5)-times as long as broad, much narrower than the preceding joint ; tip truncate, with a tuft of setae. All the joints of this leg, excepting the dactylus, are fringed, along their margins, with long, feathered setae, but they are quite unarmed. In the specimen from Stat. 102, which is the type of this species, the fifth legs are missing. The specimen from Stat. 3 1 3 may once prove to belong to a distinct species, but the differences are perhaps owing to the younger age.' The rostrum, that appears hardly longer than wide in the middle, is much short er than the extra-orbital angles. The eye-peduncles, very slender, 25-times as long as thick in the middle, are compa- ratively longer than in the type specimen, measuring just two-thirds the length of the carapace ; the eyes are one and a half, the base of the peduncles 3-times as thick or broad, looked at from above, than the middle of the peduncle. The scaphocerite, that reaches a little beyond the middle of the eye-peduncles, shows another form than in the other specimen, the outer margin, indeed, terminates in a distinct spine at a right angle with the obtuse extremity of the scale. As was already remarked, the measurements of the four anterior legs are indicated above in parenthesis and show that the joints are generally of a somewhat stouter form. The chela of the first legs appears a little longer with regard to the carpus, but the second legs resemble those of the type and, as in the latter, the chelae of these legs are just as long as those of the first pair. The fifth legs are present and are quite characteristic : they are much th inner and feebier than the two preceding legs. The ischium is elongate, very slender, 15-times as long as thick in the middle and but little thicker at both extremities. Merus much shorter than the preceding joint, the proportion being as 1 :o,Ó4; the merus very slightly thickens distally and is 8-times as long as thick at the distal extremity. The relative dimensions are: merus 2,5; carpus i; propodus 1,3. Carpus conical, 2,6-times as long as thick at distal extremity. Propodus 3-times as long as wide in the middle and about half as wide at either extremity as in the middle ; the arcuate, posterior margin with 5 or 6, feathered setae. Dactylus hardly shorter than the propodus, 7-times as long as broad proximally and slightly narrowing toward the distal extremity which is truncate and furnished with two feathered setae, as long as the dactylus itself, while three other similar setae occur on the lower margin. The type specimen from Stat. 102 is 18 mm. long, the other 12,4 mm.; the carapace of the latter, rostrum included, is 3,9 mm. long, that of the type 5,5 mm. Automate de Man. The genus Atitomate de Man, established in 1888 for a species living in the Bay of Batavia, is represented in this collection by a new species, remarkable by the propodi of the 6 139 third and the fourth legs being devoid of spinules on their posterior margin and by another species that could not be determined with certainty, because the legs of the first pair are missing, but that probably ought to be referred to Aut. dolichognatha or Aut. Gardineri. Four species are at present known to inhabit the Indopacific region: i° Aut. dolicho gnatha de Man, observed in the Bay of Batavia, at Penang and at Djibouti, 20 Aut. Gardiueri Cout., known both from the Western Indian Ocean and from the Pacific (Kingsmill Islands) so that this species certainly will prove to occur also in the East Indian Archipelago ; 30 Aut Salomoni Coüt., a species still only taken at Chagos, Salomon Island and 40 the new Aut anacantJiopus, that occurs in the East Indian Archipelago. One species, Aut. Talismani Cout. occurs at the Azores and another, Aut. Evermanni, has been recorded by Miss Rathbun from Porto Rico ; the latter species, finally, is represented in the Bay of Panama by Aut. rugosa Cout. The species of this genus are living in shallow water, the greatest depth at which this genus has been observed, being 137 fathoms, but this species, Aut. Evermanni, was also taken at 12 to 18 fathoms. Key to the species of the genus Automate. ax Rostrum very small, triangular, acute or a little larger, obtuse, but never reaching beyond the frontal margin of the carapace. Scale of the scaphocerite shorter than the median antennular article. ö1 Rostrum very small, triangular, more or less acute. cx Carpocerite slightly longer than the antennular peduncle. Scapho- cerite not yet reaching to the middle of the second article ; visible part of basal article clearly shorter than the eye-peduncles. Second carpal segment of second legs one and a half as long as the first. Propodus of the third legs armed with spinules on its posterior margin dolichognatha de Man (J. G. de Man, in: Archiv fïir Naturg. 53. Jahrg. 1888, p. 529, Taf. XXII, Fig. 5). c% Carpocerite slightly longer than the antennular peduncle, scale of the scaphocerite reaching two-thirds the length of the second article of the antennular peduncle ; visible part of basal article distinctly longer than the eye-peduncles. Second antennular article one-fourth longer than the visible part of the first. No spinules on the posterior margin of the propodus of third legs . . . anacantJiopus de Man cz Carpocerite a little longer than the antennular peduncle, scapho- cerite in adults reaching two-thirds the length of second anten- nular article-, visible part of basal article distinctly longer than the eye-peduncles. Second carpal segment of second legs 3- or 4-times as long as the first. Proportion between length and heisht of the larsj-e chela in the female more than 2 . . . Evermanni Rathb. (M. J. RATHBUN, in: U.S. Fish Commission Bulletin for 1900, Vol. 2, Wash. 1901, p. 112, Fig. 22). 7 140 cé Carpocerite not longer than antennular peduncle. Proportion between length and height of the large chela in the female less than 2, the palm being just as long as high. Upper and lower margin of the palm very rugose. Second legs as in Aut. Evermanni rugosa Cout. (H. COUTIÈRE, in: Buil. Mus. Paris, 1902, p. 341). ó„ Rostrum distinct, though small and rounded. Carpocerite hardly longer than the antennular peduncle. Scaphocerite just reaching beyond the middle of second antennular article. Visible part of basal article much shorter than the eye-peduncles. Second antennular article much longer than the visible part of the first. Second legs as in Aut. dolichognatha Gardineri Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 854, Fig. 127, 128). 63 Rostrum triangular, the obtuse tip reaching almost as far forward as the anterior margin of the carapace. Eye-peduncles therefore much shorter than the visible part of basal antennular article. Scaphocerite not reaching to the middle of second antennular article. Second carpal segment of second legs only one-third longer than the first Talismani Cout. (H. COUTIÈRE, in: Buil. Mus. Paris, 1902, p. 340). a.2 Rostrum triangular, acute, reaching, beyond the frontal margin, to the distal third part of the eye-peduncles. Scaphocerite extending to the apex of second antennular article Salomoni Cout. (H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 190S, p. 2). f 1. Automate sp. Stat. 19. March 19/21. 8°44'.5 S., n6°2'.5E. Bay of Labuan Tring, west coast of Lombok. 18 — 27 m. River-mud, coral, coralsand. 2 egg-bearing females. Stat. 86. June 18/19. Anchorage off Dongala, Palos-bay, Celebes. Shore. 1 female with eggs. Stat. 1S1. September 5/1 1. Ambon. Reef. 1 specimen. It remained uncertain to which species these specimens belong, because all have lost their legs of the first pair, but they probably belong either to Aut. Gardineri Cout., a species observed in the Maldive Archipelago and at Kingsmill Island, or to Aut. dolichognatha de Man from the Java Sea. The largest specimen is a female from Stat. 19, long 15,5 mm. The median frontal process is triangular, obtuse and resembles that of Aut. Gardineri (H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, Fig. 127a). Eye-peduncles also as in this species. The visible part of the basal antennular article measures two-thirds the length of the eye-peduncles and appears just half as long as the median article, when the latter is measured along its inner margin ; the median article which is 3-times as long as thick, appears 3-times as long as the third article. The eye-peduncles measure but a little more than one-fourth the length of the 8 141 antennular peduncle, the invisible part included. Stylocerite as in the tvvo cited species, as long as basal article. The carpocerite extends beyond the tip of the antennular peduncle by half the length of the third joint. The terminal spine of the scaphocerite reaches to the distal fourth part of the median antennular article, as in Aut. Gardineri (H. Coutière, 1. c. Fig. 127a). The telson apparently differs from that of Aut. dolichognatha by the posterior margin being less broad with regard to the length and by the posterior pair of spinules of the upper surface being situated nearer to the anterior pair (vide : J. G. de Man, in : Archiv f. Naturg. 53. Jahrg. 1888, Taf. XXII, Fig. 5/). In the other specimens, however, the two pairs of spinules are just as far distant from one another as in that figure of Aut. dolichognatha. The spinules of the posterior pair of the upper surface measure one-ninth, in the specimen from Ambon one-eleventh the length of the telson ; the longer, internal spinules of the posterior margin, which are 4-times as long as the outer, are a little longer than the posterior margin is wide. In the larger female from Stat. 19 the merus of the second legs is 10-times as long as wide, in the female, long 10 mm., from Stat. 86, 8,62-times; the slender carpus, which in the female from the west coast of Lombok is 19-times, in that from Stat. 86 18,3-times as long as thick at the distal extremity, appears in the former 1,43-times, in the latter 1,5-times as long as the merus. In the female from Stat. 19 the second segment of the carpus is one- fourth longer than the first and twice as long as the fifth ; the first segment is just twice as long as the fourth, which is the shortest of all, the third one-sixth longer than the fourth and almost as long as the fifth ; the chela measures four-fifths the length of the first segment and the fingers are very little longer than the palm. In the female from Stat. 86 the second segment is 1,66-times as long as the first and about twice as long as the fifth; the first 1,75-times as long as the fourth, which is the shortest of all, the third one-fourth longer than the fourth and almost as long as the fifth ; the chela appears in this specimen not shorter, but slightly longer than the first segment, the proportion being as 1,1 : 1. These measurements agree fairly well with those of Aut. Gardineri, in which species the fourth segment is described as the shortest of all, the third and the fourth of equal length, while in Aut. dolichognatha the fourth and the fifth are equal and a little shorter than the third. In the other specimens the second legs are missing. The measurements of the third legs are mentioned in Table B, unfortunately of Aut. Gardineri the legs of the third and following pairs have not been described. The slender carpus bears a tuft of setae at the distal extremity of both margins and there are also one or two setae at the far end of the anterior margin of the merus. The stout propodus is armed with 7 rather strong spinules, the longest of which measure two-thirds the width of the propodus; a tuft of setae at the distal extremity of the anterior margin of this joint are almost as long as the dactylus, which is half as long as the propodus. In the specimen from Ambon the propodus bears also 7 spinules, in that from Stat. 86 six and in both specimens the dactylus is a little more than half as long as the propodus. In the ova-bearing female from Stat. 86, long 10 mm., the frontal process appears comparatively longer than in the described specimen, measuring one-third the length of the eye-peduncles ; the latter are not longer, but even a little shorter than the visible part of basal 9 SIBOGA-EXPEDITIE XXXIX a'. 19 142 antennular article and the corneae are comparatively larger, reaching backward as far as the tip of the rostrum. The median, antennular article appears hardly one and a half as long as the visible part of the first and 3-times as long as the third ; the scaphocerite reaches almost to the end of median article. As regards the frontal and antennal region, the specimen, long 12 mm., from Ambon agrees with that from the Station 86. It is difficult to say whether the described differences exhibited by the specimens from the Stations 86 and 181 are due to a difference of age, or that these specimens belong to another species than those from Stat. 19. Compare also the measurements in the Tables A and B. Table A. Proportion between the length of the telson and the width of the posterior margin. Proportion between the width at the base and that of the posterior margin. Proportion between the length of the telson and the distance of the anterior pair of spinules from the posterior margin Proportion between the distances of both pairs of spinules from the posterior margin 4,8 1 Ó) i,9 i-5 5-5 ' 4,9 3)5 3)4 i)9 Table B. Merus Relative dimensions of Carpus Propodus Proportion between the length and the width of the merus . Proportion between the length and the width of the propodus. N° 1 Stat. 19; N° 2 Stat. 86; N° 3 Stat. 181. 1-57 1,64 1,66 1 1 1 of third legs 0,85 1,06 1 J) 0/ n 0 c 0)- J 3.2/ 4 4 4 f 2. Automate anacanthopus de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 317. Stat. 114. July 8. o°5S'.5N., I22°55'E. Entrance of Kwandang-bay. 75 m. Hard sand, very fine. 1 mutilated specimen, probably a female. Stat. 193. September 13/14. Sanana-bay, East coast of Sula Besi. 22 m. Mud. 1 mutilated specimen. Rostrum acute, very small, its length one-fifth that of the eye-peduncles, the latter as in the other species of this genus; corneae almost extending to the middle of the peduncles, that are obtusely pointed at the tips. The eye-peduncles are a little shorter than the visible part of the basal antennular article, the proportion being as 7:10. Antennular peduncle rather slender; median article 3-times as long as thick in the middle, one-fourth longer than the visible part of basal article and 2,5-times as long as the third, the visible part of basal article and the two following being in proportion to one another as 4 : 5 : 2. The inner margin of the basal article has a small spine a little in front of the eyes, just at the angle where the margin is turned outward ; several stiff setae are observed at the apex of the basal and of the median article. Stylocerite acuminate, a little shorter than basal article. 143 In the specimen from Stat. 193 which is here described, the thicker basal part of the outer flagellum consists of 1 1 articles, the two or three distal articles are slightly longer than thick. Carpocerite slender, 6-times as long as thick, a little longer than the antennular peduncle ; the terminal spine, 4-times as long as broad at its base, of the scaphocerite extends to the apex of median antennular article and measures one-fifth the total length of the scaphocerite, while the scale reaches until to the distal third part of median article. The measurements of the telson are indicated in Table A. Spinules of the upper surface small, those of the posterior pair measuring one-fourteenth the length of the telson and implanted, like those of the anterior, close to the lateral margins; the latter are emarginate on their proximal half. Outer angles of the posterior margin rather indistinct; the longer internal spinules are a little longer than the width of the posterior margin and measure one-fourth, in the younger specimen from Stat. 1 1 4 even one-third the length of the telson. Table A. 1. 2 4,5 2,1 4,7 3-4 i,94 Proportion between the length of the telson and the width of the posterior margin. Proportion between the width at the base and that of the posterior margin . Proportion between the length of the telson and the distance of the anterior pair of spinules from the posterior margin Proportion between the distances of both pairs from the posterior margin . . The specimen from Stat. 193 has lost both chelipeds, that from Stat. 114 supports still the small one. Merus of the latter 1,4 mm. long and 3-times as long as wide, presenting its greatest width a little before the middle and narrowing more proximally than distally ; upper margin with short setae that become longer toward the rounded distal extremity. Length of the carpus two-fifths that of the merus, the carpus one-third longer than thick or high at the distal end, the thickness or height being in proportion to the length as 3 : 4 ; the upper margin of the carpus is beset with rather long setae and ends, at the outer side, in a small, acute tooth, while a similar tooth, slightly larger, occurs at the distal end of the lower margin. The distal surface of the carpus is concave, embracing the palm, and the distal border of the inner surface is emarginate. Chela 1,93 mm. long, one-third longer than the merus and a little more than 3-times as long as the carpus ; measured in the plane of the fingers, that are but slightly shorter than the palm, the chela appears 3, 3-times as long as high. The distal margin of the outer (lower) surface of the palm carries a small, obtuse tooth near the base of the cutting-edge of the immobile finger. The fingers, the pointed tips of which are crossing one another, sluit close together and the immobile finger appears a little higher at its base than the other. The immobile finger bears a small, tridentate lobe near the articulation, foliowed by a slight emargination of the cutting-edge, while one observes a very small, acute tooth at the distal end of this concavity; the following part of the cutting-edge appears entire, but there are probably still 2 or 3 small teeth near the tip. The dactylus bears a small, acute tooth opposite to the described emargination on the other finger and between this tooth and the tip 7 or 8 smaller teeth occur. The chela is fringed with rather long setae, near the upper margin of the palm and dactylus, at the inner side. 11 144 2,14 2 1 I of third legs J,34 5 1 '00 3,82 3,6 [ 6,2 5o The external maxillipeds and the legs of the second pair are missing in both specimens. The measurements of the third le^s are indicated in : Table B. 1. 2. Merus Relative dimensions of ^ Carpus Propodus Proportion between the length and the width of the merus . Proportion between the length and the width of the carpus . Proportion between the length and the width of the propodus N° 1 Stat. 114; N° 2 Stat. 193. These third legs are characteristic, because the propodus which narrows rather much distally, appearing one and a half as wide near the carpal articulation as at the distal extremity, is d e v o i d o f s p i n e s on its posterior margin ; this margin carries, however, especially on the middle third, several rather stout and long setae, and four or five occur also at the distal extremity; a few shorter setae exist on the anterior margin and on the outer side. The dactylus measures almost two-thirds of the propodus, the proportion being as 1:1,7 m the specimen from Stat. 193 and as 1:1,6 in the other; the dactylus is tapering, slender, slightly curved, 6-times as long as thick at base. Relative dimensions of the fifth legs in the specimen from Stat. 193: merus 1,7; carpus i; propodus 1,5. Merus 6, 6-times as long as wide, carpus 4-times, propodus 7,3-times; proportion between the length of the dactylus and that of the propodus as 1 : 2,2, the dactylus being almost half as long as the preceding joint. In the tube containing the specimen, long 9 mm., from Stat. 114, are lying two eggs, that probably belong to it -, these eggs are 0,57 mm. long. The length of the other specimen is perhaps 9,5 mm. Remarks. Atttomate anacanthopus differs from Aut. dolichognatha de Man and Aut. Gardineri Cout. by the propodi of the third and following legs bearing no spines on their posterior margin ; it remains uncertain whether it differs also from the other species by this character, because nothing is known about the presence or absence of spines on their legs. Aut. Salomoni Cout. is distinguished by the longer rostrum, the longer stylocerite, the longer scaphocerite etc. Aut. Talismani Cout., Aut. rugosa Cout. and Aut. Evermanni Rathb. are no doubt also other species. Athanas Leach. The genus Athanas, no species of which are known to inhabit the coasts of America, was hitherto represented by 10 species: 5 belonging to the Nitcscens group of Coutière, in which the chelae of the first pair are directed straight forward, 5 to the DimorpJius group, in which these chelae with their carpi are directed backward, enclosed by the excavate meri. The first described species, Ath. nitescens Leach, is one of the two that do not occur in the Indopacific; it ranges from . Christiania Fjord (Lat. 6o°) to the Cape Verde Islands, inhabiting the coasts of England and of France, the Mediterranean and the Adriatic seas. Pearson lately recorded 145 this species from Cheval Paar, Ceylon, which record, indeed, should be very interesting, but I am not quite sure whether his species should not belong to Ath. Naifaroensis or AtJi. aretcformis. Ath. veloculus Sp. Bate, collected by the "Challenger" also at the Cape Verde Islands, is considered by Coutière as a variety of Aih. nitescens. The other atlantic species is Ath. Grimaldii Cout., a form inhabiting the same Archipelago and observed also at Belle-Isle; this species, described quite lately, is remarkable by the extraordinary development of the Appendix masculina on the 2nd pleopods of the male. Ath. Naifaroensis Cout., of which only the female is known, inhabits the Maldive Archipelago ; in this species the supra-corneal tooth is more strongly developed than in the two european species and the carpus of the first pair of legs is shorter, when compared with the merus. Closely related to this species is Ath. areteformis Cout. from the same Archipelago, which chiefly differs by the absence of the infra- corneal spine. The fourth species of this group is Ath. Granti Cout. from the South Adelaide coast, which differs from the preceding by the lack of a supra-corneal tooth and especially by the dactyli of the three posterior legs being distinctly biunguiculate. To the other group belongs in the first place Ath. dimorphus Ortm., which has given its name to the group. This species inhabits the Red Sea (Suez) and has also been observed at Perim, Djibouti, Dar-es-Salaam, even at the shores of New Caledonia and perhaps at those of the Fiji Islands. A variety monoceros Heller occurs in the Red Sea. Ath. Minikoensis Cout., of which only the female was hitherto known, differs from Ath. dimorphus by the carpus of the first pair of legs being much shorter than the merus and than the chela : this species occurs at Minikoi Atoll and was captured by the Siboga Expedition near the island of Siau and on the west coast of New Guinea. The third, Ath. Haswelli Cout., from the South Adelaide coast, is closely related to Ath. Minikoensis, but the carpus of the first pair of legs of the female (the male is unknown) is slender as in Ath. dimorphus. Ath. orientalis Pearson is also only known by the female, at least as regards the first pair of legs, and it inhabits the shores of Ceylon ; this species is also closely related to Ath. Minikoensis, but the carpus of the first pair of legs is not conicak but has a more slender form, being almost 5-times as long as thick at the distal extremity. The fifth species is Ath. Djiboutensis Cout., that occurs at Djibouti, in the Maldive Archipelago, at Minikoi Island and even in the Pacific, at the shores of the island of Funafuti. Besides Ath. Minikoensis Cout., four species were collected in the East Indian Archipelago by the Siboga Expedition that all proved to be new to science. Ath. parvus, from the south coast of Timor, is only known by the female-, it belongs to the Nitescens group. By the biunguiculate dactyli of the three posterior legs and by the lack of a supra-corneal tooth it much approaches to Ath. Granti, but, while in the latter the legs of the first pair resemble those of Ath. Naifaroensis, in those of Ath. parvus the carpus appears 2, 5-times as long as thick and the chela is hardly longer than the merus. Two species of the Dimorphus group were collected, that differ from all the other known species of this group by the dactyli of the three posterior legs being biunguiculate. In Ath. jedanensis from the Jedan Islands the legs of the first pair of the male resemble those of Ath. Djiboutensis, while those of the female are equal and much agree with those of Ath. Minikoensis. The other, Ath. Sibogae, collected at various localities of the Archipelago, has the first pair of legs much as in Ath. Djiboutensis. 13 146 I cannot say to which group the fourth new species, Ath. tenuipcs, ought to be referred, because the chelipeds are missing. This species, observed at the entrance of Kwandang-bay, may, however, easily be distinguished by the very slender legs of the second to fifth pairs. Key to the species of the genus Athanas. ax Legs of the first pair with the carpi and the chelae directed straight forward, merus short. [Nitescens group). ö1 Dactyli of three posterior legs simple. Supra-corneal spine more or less developed. c1 Supra-corneal spine little marked, a more or less obtuse prominence. Infra-corneal spine distinctly developed. Carpus of the first pair of legs, in the female, about twice as long as thick at the distal extremity, merus measuring two-thirds the length of the chela nitescens Leach (veloculus Sp. Bate) (Vide: C. HELLER, Die Crustaceen des südlichen Europa. Wien 1863, p. 281, Taf. IX, Fig. 21—23 and C. Spence Bate, Report Challenger Macrura, 1888, p. 529, PI. XCVI, Fig. 1). c„ Supra-corneal spine quite conspicuous, prominent. Carpus of the first pair of legs, in the female, one and a half as long as thick at the distal extremity, merus measuring two-thirds the length of the chela. dx Infra-corneal spine distinctly developed Naifaroensis Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 859, Fig. 131). da Infra-corneal spine wanting areteformis Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 860, Fig. 132). b„ Dactyli of three posterior legs with a small, ventral, accessory tooth, acute and conical, that makes 110 angle with the posterior margin of the dactylus. Legs of the first pair of equal shape in the male and in the female; carpus, in the female, even a little shorter than thick at the distal extremity, merus half as long as the chela. Appendix masculina elongate, reaching beyond the tip of the inner ramus of 2nd pleopods and inserted on the middle of the ramus. Grimaldii Cout.1) (H. COUTIÈRE, in: Buil. de 1'Institut Océanogr. Monaco. N° 197. — 20 Janvier 191 1). 1) In Coutière's description of Ath. Grimaldii the dactyli of the three posterior legs are said to be simple, but Professor Coutière wrote me afterwards the following : "Quant aux dactyles 3, 4, 5, ils possèdent évidemment une tracé de division, Ie bord libre est tres légèrement interrompu, et la partie distale de la griffe est aussi plus mince que la partie proximale, comme si on 1'avait creusée latéralement". Through the courtesy of Professor Lenz of the Naturhistorisches Museum at Lübeck I was able to study 8 specimens of Ath. Grimaldii collected at Porto Grande, St. Vincent, Cape Verde Islands and so I could establish the fact that the dactyli terminate, at the distal third of their posterior margin, in a small, acute, conical, accessory tooth, which is separated by a narrow incision from the distal part of the dactylus and which makes no angle with the posterior margin, the tooth being directed toward the distal extremity of the joint. Properly speaking the dactyli are therefore in reality biunguiculate, though they appear simple when examined under a feeble magnifying-glass and this opinion is corroborated by the following observation. In one of the specimens, an egg-bearing female, about 12 mm. long, the accessory hook of the dactyli of the 3rJ and 5th legs is directed backward, making a distinct angle with the posterior margin, about as in Ath. Granti^ whilst in the 4'h legs it shows the normal typical form : as this specimen for the rest fully agrees with the others, it must evidently be regarded as an individual variety. In this specimen the meri of the 3rd legs proved to be 3,8-times as long as wide, in another specimen, also an adult female, 4-times, and in a young specimen 3,S5-times: according to the original description the proportion should be 4,6 — 4,9. 14 M7 A. Dactyli of three posterior legs distinctly biunguiculate, the ventral accessory hook making a distinct angle with the posterior margin. Supra-corneal spines wanting. Cj Infra-corneal spine very short. Legs of the first pair of the female as in At li. Xaifaroensis. Dactyli of three posterior legs with the accessory hook conical, much shorter than the principal hook. Granti Cout. (H. Coutière, in: Buil. Soc. Philom. Paris, 1908, p. 2). cs Infra-corneal spine hardly shorter than the extra-corneal. Chela of the first pair of the female almost as long, hardly longer than the merus, carpus 2,5-times as long as thick. Dactyli of three posterior legs with the accessory hook slender, a little more than half as long as the principal hook parvus de Man a2 Legs of the first pair with the carpi and the chelae directed backward, fitting in the elongate, excavate merus. {Dimorphus group). ó1 Dactyli of three posterior legs simple. Cj Supra-corneal teeth vvanting. dx Carpus of the first pair of legs of the female slender, much longer than the chela. e1 Rostrum reaching until to the second antennular article . . dimorphus Ortm. (A. ORTMANN, in: Jenaische Denkschriften VIII, 1894, p. 12, Taf. I, Fig. 1). e„ Rostrum a little longer than the antennular peduncle . dimorphus Ortm. var. monoceros Heller (Alpheus monoceros Q. Heller, in : Sitzungsber. Kais. Akad. Wiss. Bd. XLIV, Wien, 1861, p. 274). d2 Carpus of the first pair of legs of the female shorter than the chela. ex Carpus conical, half as long as the merus ; chela slightly longer than the merus Minikoensis Cout. ez Carpus slender, in proportion to the chela as 0,85 : 1 Hasioelli Cout. orientalis Pearson ]) (H. Coutière, in: Buil. Soc. Philom. Paris, 1908, p. 2 and J. Pearson, On the Macrura, in: Herdman's Report on the Pearl Oyster Fisheries, 1905, p. 88, PI. II, Fig. 10). c„ Supra-corneal spines distinctly developed. Legs of the first pair in the female very unequal .... Djiboutensis Cout. (H. COUTIÈRE, Alpheidae Mald. and Lacc. Archip. 1905, p. S56, Fig. 129). ö„ Dactyli of three posterior legs biunguiculate. Supra-corneal spines wanting. 1) The brief description of Ath. Haswelti makes it impossible to indicate a differential character between this species and Ath. orientalis. According to Pearson's figure the proportion between the carpus and the chela should be in this species also 0,85. *5 148 c1 Infra-corneal spine as long as the extra-corneal. Legs of the first pair in the female subequal, resembling the small cheliped of the male Sibogac de Man 0, Infra-corneal spine wanting. Legs of the first pair in the female equal, resembling those of Ath. Minikoensis jedanensis de Man f 1. Athanas parznis de Man. J. G. DE MAN, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI. 1910, 315. Stat. 285. January 18. 8° 39.1 S., I27°4'.4E. Anchorage South coast of Timor. 34 m. On the limit between mud and coral. 1 egg-bearing female. This species that belongs to the Nitescens group, is apparently closely related to Af//. Granti Cout. from the South Adelaide coast, but it seems to differ by the different form of the first pair of legs ; it is, however, to be regretted that so few characters of Ath. Granti have been described. The rostrum of Ath. partnis is triangular, carinate, acuminate, just reaching beyond the apex of the second antennular article and rejoining the orbital margin by a concave curve; supra-corneal spine wanting. Extra-corneal and infra-corneal spines well-developed, the extra- corneal extending by half its length beyond the eye, the other is a little shorter. Median antennular article a little wider than long, half as long as the visible part of basal article, third a little longer than the second; the stylocerite reaches to the apex of median article. Carpocerite 3,5-times as long as thick, reaching to the apex of the second antennular article, scaphocerite as in Ath. Naifarocnsis. Telson 4,2-times as long as the posterior margin is wide, the latter as in Ath. Sibogac ; proportion between the width at the base and that of the posterior margin 1,8. Anterior pair of spinules of the upper surface just before the middle, the proportion between the length of the telson and the distance of the anterior pair from the posterior margin being 1,95; proportion between the distances of both pairs from the posterior margin 1,7. The spinules of the upper surface measure one-tenth the length of the telson. Legs of the first pair equal, feeble. Ischium 3,4-times as long as wide, with a stiff seta at the proximal end and another just before it. Merus 1,7-times as long as the ischium and 4,4-times as long as wide in the middle, appearing here wider than at either extremity. The carpus, that measures two-thirds the length of the merus, is 2,5-times as long as thick at the distal end and the chela is hardly longer than the merus, the proportion being 1,08; measured in the plane of the fingers, the chela appears 4,4-times as long as high and the fingers that shut together and that are unarmed, are shorter than the palm, the fingers being in proportion to the length of the chela as 1 : 2,6. In Ath. Naifarocnsis, however, the chelipeds of which should agree with those o'f Ath. Granti, the carpus appears, according to the figure (H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, Fig. 131 c), only half as long as the merus and not yet one and a half as long as thick, while the chela appears one and a half as long as the merus. Merus of second legs 6,5 to 7-times as long as wide in the middle. Carpus 1,4-times 16 149 as long as the merus, and 10,5-times as long as thick at its distal extremity; first segment 5-times as long as thick at the distal extremity, shorter than the sum of the four following, the proportion being as 1 : 1,33; second segment a little shorter than the third and the fourth that are equal, the three segments longer than thick; the third and the fourth one and a half as long as thick ; chela nearly as long as the first segment, hardly a little shorter, fingers as long as the palm. Ischium of third legs with a slender spine at the base of the posterior margin. Relative dimensions of third legs: Merus 2; carpus 1 ; propodus 2,25. Merus 7-times, propodus 10,2-times as long as wide, the latter with 6 short spinules on the posterior margin and a longer one at the distal extremity, which is half as long as the dactylus and that measures one-séventh of the propodus. Dactylus b i u n g u i c u 1 a t e , one-third the length of the propodus, slender, 7-times as long as wide near the articulation ; ventral hook a little more than half as long as the dorsal or principal hook, slightly divergent, the anterior margin of the ventral hook being not parallel with that of the other; dorsal hook 3-times as wide at its base as the ventral. Following legs also biunguiculate. Ova 0,5 mm. long. Length of the single specimen collected 6,5 mm. Remarks. Apart from the first pair of legs, this species much resembles Ath. Sibogae\ the merus of the second and following legs is, however, a little more slender, as also the propodus of the three posterior legs and the dorsal hook is 3-times instead of twice as broad at its base as the other. There are, however, still more differences. f 2. Athanas Minikoensis Cout. Athanas Minikoensis H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 858, Fig. 130. Stat. 125. July 18/19. Anchorage off Sawan, Siau-island. Reef. 1 egg-bearing female. Stat. 169. August 23/25. Anchorage off Atjatuning, West-coast of New Guinea. Reef. 1 adult male. In the male from Atjatuning the rostrum agrees with Coutière's figure a and reaches almost to the apex of the second antennular article; the upper margin which is sharply carinate, is slightly directed downward. Supra-corneal spine and infra-corneal spine also as in the type, but the latter spine slightly less acute. In the female the rostrum, though reaching as far forward, appears a little broader with regard to its length. Median antennular article one-fourth shorter than the visible part of the first and hardly longer than the third; stylocerite reaching to the distal extremity of the second article. Antennal scale as long as the antennular peduncle, terminal spine just reaching beyond it; carpocerite much shorter than the scale, 3-times as long as thick, measured at the lower side. Telson, in the male, 3,8-times as long as the posterior margin is wide, proportion between the width at the base and that of the posterior margin 1,8; longer, internal spinules of the posterior margin only a little shorter than the latter is broad and 3-times as long as the outer, that reach as far backward as the end of the telson. Anterior pair of spinules of 17 SIBOGA- EXPEDITIE XXXIx'ö. 20 i5o the upper surface implanted a little before the middle, proportion between the length of the telson and the distance of that pair from the posterior margin 1,7; proportion between the distances of both pairs from the posterior margin 1,8. Both in the male and in the female the legs of the first pair are unequal. In the male the left is the larger, the merus reaching as far forward as the carpocerite : this leg much resembles that of the male of Ath. dimorphus (H. Coutière, Les "Alpheidae", 1899, Fig. 205). Ischium 2,5-times as long as wide at the distal extremity, the straight upper margin supports at the distal extremity a movable spine, the length of which is one-fourth that of the member, another, half as long, just behind the middle and a third of the same length at the proximal extremity. The merus, vaginiform along its whole length, is 2,3-times as long as the preceding member, just 3-times as long as wide and closely resembles that of Ath. dimorphus Ortm. The short, conical carpus is about half as long as the ischium. The chela, one-third longer than the merus, resembles that of Ortmann's species, but one observes a small tooth on the lower margin near the carpal articulation ; the chela is nearly 5-times as long as high. The fingers that measure almost one-fourth the length of the chela, shut nearly together, while their tips meet one another; the immobile finger carries one or two teeth. The dactylus which is strongly curved, appears as thick at its base as the other finger. The other leg, in the male, much resembles the described one, but is smaller. Ischium one-third shorter than that of the large cheliped, also 2,5-times as long as wide at the distal extremity, but without movable spinules on the upper margin. Merus a little more than 3-times as long as wide, shorter than that of the large cheliped, the proportion being as 3:5; its shape is, however, the same. The carpus, exactly as long as in the larger leg, measures one- third the length of the merus, but the chela which is 1,4 mm. long, appears half as long as that of the larger cheliped, but only a little longer than the merus (1,29 mm.). The fingers that shut together and the cutting-edges of which are entire, unarmed, measure almost one- third the length of the chela, the proportion being 3,3; the chela is 4-times as long as high. In the female the right leg is the larger: it apparently agrees with the description and the figure c of the cited paper. The ischium, 0,84 mm. long, is 3, 4-times as long as broad distally, showing a more si en der form than that of the larger cheliped of the male; but the three spinules of the latter are implanted in the same manner. The merus that measures 1,26 mm., appears just one and a half as long as the ischium and 3,6-times as long as wide ; it appears more distinctly truncate at the distal extremity and it narrovvs proximally less considerably than in Fig. c of Coutière's paper, the greatest width being in proportion to the width at the proximal extremity as 25 : 14. Carpus exactly half as long as the merus and twice as long as thick; it is one-fourth shorter than the ischium, the proportion being as 3 : 4. Chela 1,54 mm. long, a little longer than the merus, the proportion being as 11:9; palm a little shorter than the merus, the proportion being as 8:9, fingers a little less than one-third the length of the chela, the length of the latter being in proportion to that of the fingers as 11:3. The fingers that are tapering and shut together, are just as long as the palm is high. The smaller leg has a quite different form and appears more si en der. Ischium i5i unarmed, almost 3-times as long- as thick; mcrus 1,8-times as long as the preceding joint, cylindrical, 5-times as long as wide. Carpus 3-times as long as thick at the distal extremity, much shorter than the merus, which is 1,54-times as long as the carpus. Chela 4-times as long as high, just as long as the merus and 1,6-times as long as the carpus. Fingers measuring a little more than one-third of the chela, the proportion between the length of the chela and that of the fingers being 2,73; fingers tapering, unarmed, excepting a very small tooth just near the tip of the immobile finger. Merus of second legs, in the male, 4, 3-times as long as wide. Carpus 1,36-times as long as the merus and g-times as long as thick near the articulation of the chela ; first segment 0,84 mm. long, slender, 5, 4-times as long as thick at the distal extremity; the four following segments, the three first of which are very short and equal, are together just as long as the first; fifth segment twice as long as thick distally and 0,35 mm. long. Chela 0,66 mm. long, a little more than one-third of the carpus, fingers a little shorter than the palm. In the female the merus is 4,7-times as long as wide, the carpus 1,35-times as long as the merus and 11-times as long as thick near the articulation of the chela; the first segment, which is 6-times as long as thick distally, appears a little longer than the sum of the four following, viz. 1,1 6-times ; fifth segment measuring just one-fifth the length of the carpus, chela almost twice as long. Ischium of third legs with a movable spine near the base ; propodus in the male with 7, in the female with 6 very short spinules and a much stronger spine, 0,21 mm. long, at the distal extremity, this spine being half as long as the dactylus. Dactylus tapering, simple, 5-times as long as wide at its base, measuring in the female just one-third of the propodus, in the male a little less, the propodus being in the male 1,61 mm. long, the dactylus 0,48 mm. Table. [ Merus Relative dimensions of [ Carpus ( Propodus Proportion between the length and the width of the merus. . Proportion between the length and the width of the propodus. Ova numerous, small, 0,42 — 0,45 mm. long. Length of the male 10,5 mm., of the female 9,5 mm. Remarks. Athanas Hasivelli Cout. from the South Adelaide coast is related to this species, but the legs of the first pair of the female seem to be equal, and the proportion between the length of the chela and that of the carpus is 0,85, in the small cheliped of the female of Ath. Minikoensis, however, 0,63. 0" 1,66 9 1 — -» li/3 1 1 of the third legs 1,8 1,76 4.3 4,3 8 8 f 3 Athanas Sibogac de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI. 1910, p. 314. Stat. 37. March 30/31. Sailus ketjil, Paternoster-islands. 27 m. and less. Coral and coralsand. 3 young specimens. 19 152 Stat. 125. July 18/19. Anchorage off Sawan, Siau-island. 31 m. Stone and some Lithothamnion. 1 young specimen. Stat. 162. August 18. Between Loslos and Broken-islands, West-coast of Salawatti. 18 m. Coarse and fine sand with clay and shells. 1 specimen, probably female. Stat. 258. December 12/16. Tual-anchorage, Kei-islands. 22 m. Lithothamnion, sand and coral. 1 specimen. Stat. 273. December 23/26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 13 m. Sand and shells. 1 male and 1 ova-bearing female. Stat. 315. February 17/18. Anchorage East of Sailus Besar, Paternoster-islands. Depth up to 36 m. Coral and Lithothamnion. 1 specimen, without the legs of the first pair. A new species of the Dimorplms group, characterized, like AtJi. jcdanensis, by the three posterior legs being biu nguicula te; it differs from this species at once by the well-developed, infra-corneal spine. Rostrum in the male from Stat. 273, which is considered as the type, triangular, 3,2- times as long as wide at its base, acuminate, carinate and projecting straight forward to just beyond the apex of median antennular article. Supra-corneal spines wanting. Looked at from above, the extra-corneal spine almost reaches to the anterior margin of the eyes; in a lateral view it appears a little shorter than the eyes and the well-developed, triangular and acute, infra-corneal spine extends as far forward as the other. Along their posterior fourth part the lateral margïns of the rostrum run nearly parallel and they make distinct angles with the orbital margins. Median antennular article slightly longer than thick, hardly one-third shorter than the visible part of basal article ; third article hardly longer than the second. Stylocerite acuminate, reaching to the apex of median article. The carpocerite extends a little beyond the median antennular article and is 3,2-times as long as thick ; scale of scaphocerite decidedly longer than the antennular peduncle, terminal spine just exceeding beyond it. Telson 4,2-times as long as the posterior margin is wide, outer angles not prominent; longer inner spinules about as long as the posterior margin is wide, the short outer ones extend beyond the end of the telson. Proportion between the width at the base and that of the posterior margin 1,9 — 1,95. Spinules of the upper surface implanted near the lateral margins, the anterior pair a little bef o re the middle, the proportion between the length of the telson and the distance of this pair from the posterior margin being 1,8 in the type, 1,75 in the specimen from Stat. 162; the proportion between the distances of both pairs from the posterior margin is 1,7 in both specimens. The spinules are of moderate length, those of the posterior pair measure one-tenth the length of the telson. In the male from Stat. 273 the legs of the first pair are unequal. Measured along its upper margin, the ischium of the left cheliped, which much resembles the larger one of the male of Ath. Djiboutensis Cout. (H. Coutière, Alpheidae Mald. and Laccad. Archip. p. 857, Fig. 129 f), appears one and a half as long as wide near the articulation of the merus ; the upper margin is armed with five movable spinules, two at the distal extremity, the longer of which is almost half as long as the upper margin, one at the proximal extremity, measuring a little more than one-fifth the length of the upper margin and three of intermediate length 153 between both extremities. The vaginiform merus, which is 2,73 mm. long, resembles that of the cheliped of Ath. Djiboiitensis • it shows its greatest wiclth just before the proximal third, this width being slightly more than one-third the length of the member, namely 1 ,05 mm. ; the upper margin is straight from the distal extremity until to the posterior third and then curves backward toward the ischium, like in Ath. Djiboutensis, the posterior margin appears somewhat like a S, running in the middle parallel with the upper margin and the merus distinctly more narrows toward the proximal extremity than toward the distal one, which is slightly excavate. Carpus very short, almost globular. Chela a little longer than the merus, appearing 3,01 mm. long when measured to the tip of the immobile finger and 3,29 mm., when the dactylus is included ; palm ovoid, twice as long as high in the middle, the chela appearing 3-times as long as high, when the dactylus is included. The concave, lower margin of the immobile finger makes, at the inner side, a dist i net angle with the convex lower border of the palm ; this angle, a little behind the articulation of the fingers, is more prominent in the small chela than in the large. As in Ath. Djiboiitensis, the fingers are gaping, the dactylus being strongly curved and somewhat longer than the immobile finger ; the proportion between the length of the chela and that of the dactylus, measured in the direction of the axis of the chela, is as 2,76 : 1, the proportion between the length of the chela and that of the immobile finger as 3,7 : 1, the dactylus being one-third longer than the other finger when measured in the direction of the axis of the chela. The immobile finger is armed with a large, compressed, subacute tooth that extends to near the upturned tip; the anterior margin of this tooth is arcuate, convex. The dactylus bears near the base a longitudinal tooth or lobe, much smaller than the tooth of the index and tridentate, and one observes three very small, conical teeth on the distal half of the finger, the first of which is a little larp/er than the followinp- The ri^ht lep; resembles the described one, but it is a little smaller and the fingers are shutting together. Ischium with 6 movable spinules, as in the other lég. The merus shows the same shape, but it is smaller, the length being in proportion to that of the merus of the right leg as 1 : 1 ,08. Chela also smaller, its length being in proportion to that of the right as 1 : 1,2; it is also 3-times as long as high, but the fingers that are finely denticulate along- their whole lencfth, shut close top; et her and measure about one-third the length of the chela. Carpus as in the other leg. The specimen from Stat. 162 is considered to be the female of this species, with some doubt, because it carries no eggs. In both chelae of the first pair the fingers are shutting together, the chelae resembling the small chela of the male; the right leg is a little larger than the left. The ischium of this leg bears eight spinules, three at the distal, one at the proximal extremity and four on the margin itself. Merus w i d e r in proportion to its length than that of the small cheliped of the male, the proportion between length and width being 2,3, in the small cheliped of the male, however, 2,6; carpus and chela as in the latter, the proportion between the length of the merus and that of the chela is the same, but the prominent angle at the inner side of the lower border appears distinctly as a small tubercle. Merus of second legs in the male 5,5-times as long as wide. Carpus 1,35-times as long 154 as the merus and io-times as long as thick at its distal extremity; first segment 5-times as long as thick at distal extremity, shorter than the sum of the following, the proportion being as 1 : 1,22; the three following segments are equal and one and a half as long as thick; chela one-eighth shorter than the first segment, fingers slightly longer than the palm. In the specimen (a female?) from Stat. 162 the merus is 5,7-times as long as wide ; the carpus is 1,3-times as long as the merus and 10-times as long as thick at its distal extremity, carpal segments and chela as in the male. The measurements of the third legs are indicated in the Table. Propodus in the male (type) with 6, in the specimen from Stat. 162 with 7 rather short spinules, and a longer one, half as long as the dactylus, at the distal extremity. The biunguicu late dactylus measures one-third of the propodus and has a si en der form, being 6-times as long as broad at its base ; the ventral, accessory hook is about half as long as the dorsal or principal one, its anterior margin runs parallel with that of the other and it appears at its base just half as broad as the dorsal hook ; both hooks are slender, the dorsal slightly arcuate, the other almost straight. Table. Relative dimensions of Merus Carpus Propodus Proportion between the length and the width of the merus . Proportion between the length and the width of the propodus. N° 1 Stat. 162; N° 2 Stat. 258; N° 3 Stat. 273; N° 4 Stat. 315. Length of the male 8,5 mm., of the specimen from Stat. 162 8,75 mm.; the ova-bearing female from Stat. 273 is hardly 7 mm. long. 1. 2. 3- 0 1,96 2 2 r-f CD I 1 I r-h 2,1 2,27 2,18 •t CL 5-7 6 6 nT aq 3,3 9,7 9,6 4- 5,7 9 f4. Athanas jedanensis de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI. 1910, p. 313. Stat. 273. December 23/26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 13 m. Sand and shells. 1 male and 3 ova-bearing females. A new species of the Dimorphus group, characterized by the lack of the infra-corneal spine and by the dactyli of the three posterior legs being biunguiculate, agreeing, as regards the first character, with AtJi. areteformis Cout. and, as regards the second, with Ath. Granti Cout. from the South Adelaide coast. Rostrum triangular, carinate, acuminate and projecting straight forward almost to or just to the middle of the third antennular article, rarely, as in the largest female, to the apex of the second; rostral carina sharp. Supra-corneal spine wanting. Extra-corneal spine acuminate, reaching in the male by half its length beyond the eyes, in the female to the anterior margin of the eyes or hardly beyond it ; infra-corneal spine wanting and represented, as in Atli. areteformis, by a slight, broad, rounded prominence of the margin. 155 Visible part of basal antennular article in the male a little more than one and a half as long as the second and one-third longer than the distal article ; in one of the females the visible part of the basal article does not yet appear one and a half as long as the second, while in this female like also in the largest one the third article appears even a little longer than the visible part of the first : in the largest female the median article appears but a little shorter than the visible part of the first. The stylocerite reaches to the end of the median article or slightly beyond it. Carpocerite twice as long as thick, shorter than the antennular peduncle ; scale of scaphocerite as long as the antennular peduncle or, as in the male, a little longer, terminal spine twice as long as broad, just reaching beyond the scale. Telson elongate, in the male 4-times, in the largest female 3,87-times as long as the posterior margin is wide, the latter half as wide as the width at the base ; posterior margin only a little prominent, not semicircular, outer angles not prominent ; the longer, inner spinules measure two-thirds the width of the posterior margin, the outer ones are half as long and reach to the end of the telson. The spinules of the upper surface are of moderate length, those of the posterior pair measure in the male one-tenth, in the adult female one-twelfth the length of the telson ; anterior pair situated just behind the middle, the proportion between the length of the telson and the distance of that pair from the posterior margin being 2,1; the proportion between the distances of both pairs from the posterior margin is 1,5. The male carries but one cheliped, that of the right side. Ischium twice as long as wide at the distal extremity, upper margin with a movable spine at the apex, that measures one-third the length of the member, two smaller spines in the middle behind one another and two at the proximal extremity. The characteristic merus, 1,61 mm. long, is almost 3-times as long as the preceding member ; the distal extremity is excavate, the distal half is widened, the merus showing its greatest width at two-sevenths its length from the distal extremity; from this point it gradually narrows towards the proximal articulation, the greatest width being in pro- portion to the width at the proximal extremity as 40 : 1 7 and the greatest width, 0,56 mm., is about one-third the length of the merus. While the upper margin is nearly straight, the lower shows a S-like form. Carpus very short. Chela 2,24 mm. long, 1, 4-times as long as the merus ; it much resembles the small chela of Ath. Djiboutensis Cout. (H. Coutière, "Les Alpheidae", 1899, p. 177, Fig. 209, the left) and it appears to be 4-times as long as high, when measured in the plane of the fingers. The fingers that measure one-fourth the length of the chela, shut together; the prehensile edge of the immobile finger is armed with eight, small, acute teeth, almost along the whole length, the dactylus bears similar teeth, four of which near the articulation are a little larger than the rest. While the upper surface of the palm is rather flattened, the lower is swollen and bulging. The chelipeds of the female are equal, very small and much differ from the described leo- of the male. In the largest female the ischium is 0,56 mm. long and 2,2-times as long as broad; like in the male the upper margin carries a movable spine, long 0,155 mm., both at the proximal and at the distal extremity and two smaller spines, behind one another, in the middle; the upper margin is somewhat setose. The merus is 1,05 mm. long, almost 23 156 twice as long as the preceding member and 3,5-times as long as wide, showing its greatest vvidth just in the middle and equally narrowing to both extremities, the distal obliquely truncate. Carpus 0,616 mm. long, but a little longer than the ischium, 0,28 mm. thick at the distal extremity, when measured in the plane of the merus, appearing about twice as long as thick; the concave, distal extremity embraces the chela. Chela 1,12 mm. long, twice as long as the ischium and hardly longer than the merus ; looked at in the plane of the merus, the chela appears thickest near the proximal fourth part ; the thickness here is one-fourth of the length and it tapers regularly to the extremity of the fingers. Measured in the level of the fingers, the chela appears a little higher, viz. 0,322 mm., appearing 3,5-times as long as high, while the height of the palm is in proportion to its thickness as 23 : 20 ; fingers tapering, a little shorter than the palm, the length of the chela being in proportion to the length of the fingers as 16:7. The immobile finger and the dactylus carry each a very small, acute and oblique tooth, a little farther distant from the tip than from the articulation, which teeth are of equal size ; one observes a larger conical tooth just near the tip of the immobile fineer, at the end of the cuttingr-edg-e, this tooth is subacute and twice as high as thick at its base and there is still another, more acute and smaller tooth which is probably placed between the other and the extremity of the finger. The dactylus, finally, bears also two teeth near the tip, but these teeth are acute, directed obliquely forward, parallel with the acute tip of the finger and are placed abreast ; they are smaller than the tip of the finger, but their form and their size are the same, while they are somewhat smaller than the conical tooth of the immobile finger and of the same size as the tooth between the latter and the tip. Merus of second legs in the male 3,75-times, in the adult female 5,75-times longer than wide. Carpus, in the male, 1,31-times, in the adult female 1,26-times as long as the merus ; in the male the carpus is 7,6-times, in the adult female 9-times as long as thick at its distal extremity, near the articulation of the chela. First segment of the carpus, in the male, 3,3-times longer than thick distally and measuring two-thirds the sum of the four following; fourth segment a little longer than the second and the third that are equal ; chela one-third longer than the first segment, fingers but a little shorter than the palm. In the adult female the first carpal segment is 4,5-times as long as thick distally and the sum of the four following segments is 1,22-times as long as the first segment; the three following segments are equal, and the chela is as long as the first segment, while the fingers are as in the male. Ischium of third legs with a movable spine near the base of the posterior margin and with another less strong spine at the distal extremity of the upper margin. Merus unarmed, propodus, in the male, with six small and feeble spinules, long 0,08 mm., and with a much longer spine, long 0,16 mm., at the distal extremity, this spine half as long as the dactylus and accompanied by a smaller one; in the adult female the propodus carries eight spinules, long 0,06- — 0,14 mm., and the larger spinule at the far end measures 0,21 mm. The dactylus, in the adult female just one-third of the propodus, in the male a little longer, is slender, 5-times as long as wide near the articulation and it bears at the distal third a small and feeble, accessory hook; this ventral hook measures about one-fourth of the principal hook, while its width at the base is only one-fourth that of the latter. 157 Relative dimensions of Table. Merus Carpus Propodus Proportion between the length and the width of the merus. Proportion between the length and the width of the propodus Ova numerous, small, 0,42 — 0,45 mm. long. The male is 8,5 mm. long, the largest of the three ova-bearing females 12 mm. of the third legs cT 9 i,9 1,82 1 i 1,92 i,93 4,42 5,2 6,7 7,7 f5. AtJianas tenuipes de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 316. Stat. 116. July 12. o°58'.5 N., I22°42'.5 E. West of entrance of Kwandang-bay. 72 m. Fine sand with mud. 1 mutilated and probably young specimen. This species, that belongs to those in which the supra-corneal spines are w a n t i n g and in which the dactyli of the three posterior legs are sim pi e, may easily be recognized by the very slender form of the four posterior legs: unfortunately the legs of the ist pair are missing. Rostrum slender, acute, slightly directed downward, 6-times as long as wide in the middle and just reaching beyond the apex of the iïrst antennular article ; its lateral borders make distinct angles with the frontal margin. Looked at from above, the extra-corneal spines almost reach the anterior end of the eyes; in a lateral view this spine appears one and a half as long as wide at its base and slightly directed upward, though not extending beyond the eyes. Infra-corneal tooth half as long as the extra-corneal spine, small, dentiform, not longer than wide. Eyes black, distinctly facetted, almost entirely uncovered. Measured from the base of the rostrum, the first antennular article appears slightly longer than the two following taken together; the second and the third that are subequal, are hardly longer than thick. The undivided part of the outer flagellum consists of 4 or 5 articles; the ist and the 4th are of equal length and one and a half as long as thick, the 3rd is a little shorter and the 2nd the shortest of all, nearly half as long as the ist. Stylocerite acuminate, reaching to just beyond the middle of median article. Basicerite with a short spine at the infero-external angle. Carpocerite about as long as the antennular peduncle, not longer; scaphocerite slightly longer than the latter, terminal spine just surpassing the blade. Abdomen nearly one and a half as long as the carapace, rostrum included ; pleura of 6th somite acute, articulate, movable. Telson characteristic, 5-times as long as the posterior margin is wide; the latter, rather narrow, appears in the middle slightly notched or emarginate and bears at either side two long spin ui es, the outer spinule as long as the posterior margin is broad, the inner one and a half as long; in the narrow interspace between the inner spinules two or three setae are implanted. Width at the base twice as broad as the posterior margin. The spinules of the upper surface are half as long as the posterior margin 25 SIEOGA-EXPED1TIE XXXIX a' 158 is wide, the anterior pair twice as far distant from the end of the telson as from the base, posterior pair nearly midway between the anterior pair and the posterior margin. Merus of second legs very slender, 12-times as long as thick. Carpus 1,17-times as long as the merus ; the first segment, 8-times as long as thick, appears a little longer than the sum of the four following, the proportion being as 1 : 0,8, and it is 0,61 mm. long; the following segments are 0,09 mm., 0,1 mm., 0,1 mm. and 0,2 mm. long. The second segment is just as thick as long, the two following almost as thick as long, the fifth twice as long as thick. Chela twice as long as the fifth segment, 3,5-times as long as broad and the fingers are one and a half as long as the palm. The three posterior legs are very slender, thin, glabrous and unarmed, excepting the ischium of the 3rd and of the 4th pair that bears two spines, one near the base, the other in the middle. Measurements of the 3ld pair: merus 1,6; carpus i; propodus 1,53; merus 9-times, carpus 7-times as long as thick; propodus without spinules, 14-times as long as wide. Dactylus simple, tapering, slightly curved, measuring two-fifths of the propodus and 10-times as long as thick at its base. The ischium of the fifth pair is probably unarmed. Measurements of these legs: merus 1,4; carpus i; propodus 1,57. Merus 11-times, propodus 1 4-times as long as broad in the middle ; carpus 8-times as long as thick distally. Dactylus three-fifths of the propodus, slightly curved, simple, tapering, 13-times as long as thick at the base. A few short setae at the far end of the propodus. This specimen, which is probably young, is 7,3 mm. long, the carapace, rostrum included, 2,8 mm.; the rostrum measures hardly more than one-fifth the length of the carapace. Jousseaumea Cout. Also this genus comprises only a few species. Three species namely : Jous. serratidigitus Cout., Jous. latirostris Cout. and Jous. cristata Cout., occur at Djibouti, in the Gulf of Aden, a fourth, Jous. Ortmanni Cout., inhabits the coast of America and the fifth, Jous. trigona Rathb., occurs at the shores of the island of Porto Rico. Two species, referred to this genus and both new to science, were collected by the "Siboga": Jous. Sibogae de Man, taken near South-Lucipara-island in the Banda Sea and Jous. hilarula de Man from the Sea between Misool and Salawatti. These two species differ from the three that occur on the reefs of Djibouti, at once by the posterior margin of the telson being marked with a median, trapezi- form notch, at either side of which only two spinules are implanted instead of four. f 1. Jousseaumea Sibogae de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 19 10, p. 303. Stat. 225c. November 8. South of Lucipara-islands. Reef. 1 female with eggs. Rostrum triangular, one-fourth longer than wide at its base, acuminate, with the lateral margins slightly concave and extending a little beyond the middle of third antennular article ; upper surface slightly convex, not carinate, in a lateral view it appears narrow or low, slightly directed downward, with the lower margin straight and the upper arcuate. Extra-corneal 26 159 teeth triangular, acute, measuring one-fifth the length of the rostrum and directed as in Jous. serratidigitus Cout. ; their internal margin runs obliquely outward and forward and makes a right angle with the lateral margins of the rostrum. In the two other indopacific species, Jous. latirostris Cout. and Jous. cristata Cout., the internal margin of these teeth runs straight forward and makes an acute angle with the rostrum (H. Coutière, Les "Alpheidae", 1899, p. 71, Fig. 21 and 22). The upper surface of the carapace is glabrous. Antennular peduncle stout, the second article a little broader or wider than long, about as long as the visible part of the first, third article one and a half as long as the second ; distal margin of the articles a little setose. The stylocerite is subacute, extends to the middle of third article and is hardly shorter than the rostrum, while its outer margin is arcuate, convex. Antennular flagella as in the other species of Jousseauwea ; the undivided part of the outer flagellum consists of one or two articles, inner branch about as long as the third antennular article ; first article of inner flagellum twice as long as thick and twice as long as the second. Carpocerite one and a half as long as thick at its distal extremity, reaching to the apex of second antennular article, and much shorter than the antennal scale, which resembles that of Jous. serratidigitus and appears as long as the antennular peduncle. Lower angle of the basicerite dentiform, acute. Pterygostomian angle of the carapace rounded. The pleura of the ist abdominal somite extend by half their length over the carapace, those of the 6th are immovable. Telson one- third longer than the 6th somite, much narrowed backward, the length of the telson equals 4,5-times the width of the posterior margin ; proportion between the width at the base and that of the posterior margin 2,3. Outer angles of the posterior margin acute, though not prominent; the margin is notched in the middle, the notch is trapeziform and its anterior margin, which is less broad than the posterior, shows another very small, median in cis ion. At either side of this incision a long seta is implanted; the posterior width of the notch measures two-thirds the width of the lateral parts of the posterior margin. At either side of the notch not four spinules are observed, as is the case in the other indopacific species of this genus, but only two, of which the inner longer one is about as long as the posterior margin is wide, while the other is half as long. Spinules of the upper surface small, measuring only 1/s0 the length of the telson ; they are placed not far from the lateral margins, the anterior pair immediately behind the middle, the proportion between the length of the telson and the distance of the anterior pair from the posterior margin being 2,3, the posterior pair just midway between the anterior pair and the posterior margin. Uropods a little longer than the telson. The large cheliped, on the left side, is only present and is borne in the same position as in Jous. serratidigitus (H. Coutière, 1. c. p. 179, Fig. 212). The merus, which in this position extends a little beyond the tip of the antennular peduncle, has a slender form ; looked at from the outer side it appears to become wider toward the distal extremity. This member is not straight, as in Jous. serratidigitus, but distinctly c u r v e d, the upper margin being convex, the lower concave; the lower face of the merus is slightly concave with the margins somewhat prominent and in the described position of the leg the merus apparently embraces the convex, lower surface of the palm. The merus therefore functions like in some 27 i6o species of the genus Atkanas, different from the other species of Jousseatimea. The carpus is short, conical and embraces the palm, while its distal margin is emarginate at the outer, at the upper and at the inner side. The chela, which is 2,94 mm. long, about two-thirds the length of the carapace, rostrum included, is almost 3-times as long as high (1,05 mm.); this number is the height or width of the upper (inner) surface of the palm. The outer (upper) border of the palm, which is ovoid, swollen and a little longer than the fingers, is marked with a longitudinal groove, but this groove is, perhaps, owing to desiccation. Near the carpal articulation the palm is deeply notched at the lower side, so that the inner (lower) border shows proximally an obtuse, dentiform angle; the lower (outer) face of the palm, that fits into the concavity of the merus, is more convex than the upper. The fingers, which closely resemble those of Jous. serratidigihis, are strongly compressed, shut close together and their pointed tips are crossing one another ; they are armed, like in that species, with 9 or 10 conical teeth along the whole length of the prehensile edge, and these teeth progressively increase in size from the first at the base to the last near the tip. Second legs nearly as in Jous. latirostris Cout. (H. Coutière, 1. c. p. 247, Fig. 299). Merus slender, slightly bent, 8,6-times as long as wide. Carpus one-fourth longer than the merus, slender; first segment 0,85 mm. long, longer than the sum of the following, the pro- portion being as 1 : 0,75 ; second segment about one-fifth the first, as long as the third and the fourth taken together, the third and the fourth of equal length ; fifth article a little longer than the second. Chela twice as long as the fifth article, almost 3-times as long as high or broad, the proportion being as 2,8 : 1 ; fingers a little longer than the palm. Ischium of third legs with a movable spine at the base. Relative dimensions of these legs: merus 1,5; carpus i; propodus 1,15. Merus unarmed, 4, 3-times as long as wide, carpus 5,2-times, propodus 7,7-times; the slender carpus bears a short spinule at the far end of the lower margin, the propodus that slightly widens distally, bears only two feeble spinules, as long as the spinule of the carpus, on its posterior margin but a longer and stronger one at the distal extremity, while a short spinule occurs at the distal end of the anterior border. The dactylus, half as long as the propodus, is simple and slender, being 6-times as long as broad at its base. The following legs have lost their propodi and dactyli. Ova 0,63 mm. long. Length 10,5 mm. f 2. Jousseaumea hilarula de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 304. Stat. 164. August 20. i°42'.5 S., I30°47'.5 E. Between Misool and New Guinea. 32 m. Sand, small stones and shells. 2 specimens of equal size. Carapace depressed. Rostrum triangular, acuminate, a little wider at its base than long and reaching to the apex of the second antennular article; the lateral margins are concave or, as in the other specimen, angular, the angle appearing just behind the distal extremity of the first antennular article. Lateral teeth, i. e. the extra-corneal teeth, very small and short, acute and directed as in Jous. serratidigihis Cout. and as in Jous. Sibogae de Man, their inner margins being at a right angle with the lateral margins of the rostrum. The upper surface 28 iói of the rostrum, which is slightly turned downward, shows a tracé of a median carina, especially when looked at obliquely, and this carina is traceable, in one specimen, as far as the gastric region. Corneae small, at some distance from the frontal margin. Pterygostomian angle rounded. Antennular peduncle stout, second article hardly longer than thick, twice as long as the visible part of the first article, third slightly longer than second. Stylocerite acuminate, a little shorter than the rostrum, reaching not yet to the apex of median article. The basal, undivided part of the outer flagellum consists of three articles which are broader than long, the third bearing the two flagella ; the short flagellum is one and a half as long as the basal, undivided part. Basicerite with a subacute tooth on the lovver side, that reaches almost as far forward as the basal antennular article. Carpocerite of a stout shape, reaching to the middle of third antennular article and just as long as the rather broad scale of the scaphocerite ; flagellum robust, shorter than the body. Posterior angle of the pleura of the third, fourth and fifth abdominal somite rather obtuse, pleura of the sixth immovable. Telson 1,7-times as long as the sixth somite, resembling that of Jons. Sièogae, the length being equal to 4,8-times the width of the posterior margin; proportion between the width of the latter and the width at the base 2,5. Posterior margin with the outer angles obtuse and with a trapeziform notch in the middle, which posteriorly appears a little less broad than the lateral parts of the margin; the anterior margin of the notch is entire and bears two feathered setae that are as long as the longer inner spinules of the posterior margin. Like in Jous. Sibogae, one observes at either side of the notch only two spinules, the inner longer one as long as the posterior margin is broad, while the outer is but a little shorter. Spinules of the upper surface small, implanted not far from the lateral margins, the anterior pair near the posterior third, the length of the telson being in proportion to the distance of this pair from the posterior margin as 2,8 : 1 ; posterior pair midway between the anterior pair and the posterior margin. In the other specimen which is a little smaller, the proportion between the length of the telson and the width of the posterior margin is 4,4 ; the anterior pair of spinules is situated a little more forward and the posterior a little farther distant from the anterior pair than from the posterior margin ; in this specimen the longer spinules of the posterior margin are even a little longer than the latter is wide. In both specimens the large cheliped is missing, the small cheliped resembles that which is observed in the genus Athanas. The ischium, twice as long as broad, carries some setae near its posterior margin. Merus twice as long as the preceding joint, slightly bent and 4-times as long as wide ; its lower face appears a little concave. The carpus measures three- fourths of the merus and appears 3, 4-times as long as thick at its distal extremity. The chela measures four-fifths of the merus and is but a little longer than the carpus; the palm appears slightly broader or higher, in the plane of the fingers, than thick, the proportion being as 4 : 3 and the length of the chela is in proportion to the width or the height as 2,4 : 1. Fingers shorter than the palm, the proportion being as 1 : 1,35; they do not quite shut together, are of equal height and are armed each with 3 or 4 small, conical teeth that increase in size from the proximal to the distal. 29 IÖ2 Merus of second legs very slender, io-times as long as wide, curved a little. Carpus almost one-third (1,28-times) longer than the merus, also very slender; first segment 8-times as long as thick at the distal end, one-ninth shorter than the sum of the four following ; second segment three-tenths of the first, fifth one-third longer than the second and just as long as the third and the fourth combined, the fourth a little longer than the third. Chela i3/:5-times as long as the fifth segment and 3,5-times as long as broad ; fingers nearly as long as the palm. The measurements, indeed, of the merus, of the carpal segments and of the chela are respectively : 1,85 mm.; 1,12 mm., 0,34 mm., 0,21 mm., 0,25 mm., and 0,46 mm. ; 0,77 mm. Ischium of third legs with a movable spine on the proximal half of the posterior margin and with another just before it on the outer surface. Relative dimensions of the third legs : merus 1,57; carpus i; propodus 0,91. Merus 4,45-times as long as wide, its greatest width at the proximal third; carpus unarmed, slender, 5,7-times as long as thick; propodus a little shorter than the carpus, also 5,7-times as long as wide, showing its greatest width at the proximal third ; the propodus bears 3 small and feeble spinules on the posterior margin and 2 at the far end one of which is longer than the preceding. Dactylus simple, short, measuring one-fourth of the propodus ; its form is rather stout, the dactylus being only 3-times as long as thick at its base. Measurements of the fifth pair: merus 1,2; carpus i; propodus 1,3. Merus 5-times as long as wide, carpus 6-times, both joints, like also the merus, unarmed; propodus 10-times as long as wide, longer than the merus, with the usual transverse tufts of setae. The dactylus resembles that of the third pair, but measures one-sixth of the propodus. Length 13,5 mm. Arete Stimps. Besides two specimens of Arete dorsalis Stimps., one new species and one variety, also new, of Ar. Afaruteensis Cout. were collected by this expedition. The two specimens of Ar. dorsalis do not fully agree with the specimen which by Professor Coutière was also referred to this species (Alpheidae Mald. and Lacc. Archip. 1905, p. 866 Y) : in the specimen from Goidu Atoll the carpocerite appears much longer than the scaphocerite and even slightly surpasses the antennular peduncle. According to Stimpson, however, the scaphocerite is not shorter than the antennal peduncle ("antennarum appendix brevis, lata, pedunculum vix superans"), just as in the specimens captured by the "Siboga". I don't venture, however, to regard Coutière's species as different, because in the "Siboga" specimens both chelipeds are missing. The new variety of Ar. Maruteensis only differs by subordinate characters. The new species, finally, Ar. Iphianassa, approaches closely to Ar. indicus Cout., but the armature of the fingers of the larger chela in the male is different and there are still more differences. A re-examination of the young specimen from Amboina preserved in the Museum of Göttingen, which specimen was referred by me in 1888 (Archiv f. Naturg. 53. Jahrg. p. 527) to Ar. dorsalis, proved it to belong to a new species for which the name of Ar. amboinensis 1) I must draw the attention to some typographical errors in this description. The merus of the third legs of Ar. dorsalis is said to be 3,7-times as long as wide (p. 867) and that of Ar. Maruteensis 3,8-times (p. 868) : in the later description of the latter species (in: Buil. Muséum Paris 1905, p. 22), however, these numbers are respectively 4,6 and 2,75: here apparently correct. 3° i63 has been proposed (J. G. de Man, in: Archiv f. Naturg. 76. Jahrg. igio, p. 25 — 27). It approaches to Ar. dorsalis Stimps., but the telson tapers more strongly, being 6,5-times as long as the posterior margin is wide and the chela is 3,6-times as long as high 1). The geographical distribution of the species of this genus is the following. Arcte dorsalis Stimps. was discovered near Hongkong and was collected by the "Siboga" on the Borneo. bank and near the island of Saleyer, while, after Coctière, this species inhabits also the Maldive Archipelago, Samoa and New Caledonia. Ar. Maruteensis Cout. has been observed in the Paumotu Archipelago, while the new variety occurs in the sea between Mindanao and Halmaheira. Ar. amboijiensis de Man is still only known from Amboina, Ar. indicus Cout. inhabits Hulule Male Atoll (Maldive Archipelago), but occurs also in the Persian Gulf and near Djibouti. This species is represented in the East Indian Archipelago by Ar. Iphianassa, which was observed on the reefs of the islands of Siau and of Obi Major, Ar. Borradailei Cout., finally, inhabits Hulule Male Atoll. The species of this genus have not yet been observed outside the Indopacific region and inhabit the reefs and shallow water. Key to the species of the genus Arete Stimps. «j Supra-corneal spines present, quite conspicuous. Dactyli of three posterior legs simple Borradailei Cout. (H. COUTIÈRE, Alpheidae Mald. and Lacc. Archip. 1905, p. 861, Fig. [33). a„ Supra-corneal spines wanting or hardly marked. Dactyli of three posterior legs biunguiculate. bx Rostrum as long or almost as long as the antennular peduncle, 3-times as long as wide at its base. Merus of third and fourth legs with a well-developed tooth. c1 Dactylus of the large chela of the male unarmed, immobile finger with one acute tooth at the base. Propodus of third legs almost unarmed, with only 2 or 3 spinules near the distal extremity indicus Cout. (H. COUTIÈRE, Alpheidae Mald. and Lacc. Archip. 1905, p. 863, Fig. 134, 135). e,., Dactylus of the large chela of the male with a rounded tooth in the middle, immobile finger with two teeth. Propodus of third legs in the male with 12 spinules, in the female with 8. Iphianassa de Man b. Rostrum reaching to the distal extremity of the first or the second antennular article, one and a half or at most twice as long as wide. Apical tooth of the merus of the third and the fourth legs feebly developed or wanting. 1) In the cited description the chela is described as being almost 5-times as long as high. This was, I suppose, the case in the other cheliped which is lost; in the only cheliped now still present and which is detached from the body, the chela is 2,75 mm. long (fingers included), 0,76 mm. high, and the fingers are I mm. long. 31 164 dx Telson elongate, 6,5-times as long as the posterior margin is wide, the latter about one-third the width at the base. One of the chelae 3,6-times, the other probably almost 5-times as long as high amboinensis de Man (J. G. DE Man, in: Archiv f. Naturg. 76. Jahrg. 1910, p. 25 — 27). d„ Telson less than 5-times as long as the posterior margin is wide. Chelae about twice as long as high. el Merus of the third and the fourth legs with a small, though distinct tooth at the apex. Merus of the second legs more than 4-times as long as wide, that of the third 4 — 4,6- times. Rostrum about one and a half as long as wide . dorsalis Stimps. e„ Merus of the third and the fourth legs truncate at the apex, apical tooth wanting or hardly discernible. Merus of the second legs 3-times as long as wide. ƒ, Rostrum one and a half as long as wide. Merus of third legs 2, 7 5-times as long as wide, propodus 4-times . . Maruteensis Cout. /„ Rostrum twice as long as wide at the base. Merus of the third legs 3,35-times as long as wide, propodus 5-times Maruteensis Cout., var. Salibabuensis de Man f 1 . Arete Iphianassa de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 312. Stat. 125. July 18/19. Anchorage off Sawan, Siau-island. Reef. 1 male and 1 ova-bearing female. Stat. 142. August 5/7. Anchorage off Laiwui, coast of Obi Major. Reef. 1 young male. A new species of small size, closely approaching to Ar. indicus Cout. Rostrum acuminate, about 3-times as long as wide at its base, reaching, as in Ar. indicus, to the distal third part of third antennular article ; anteriorly the rostrum is carinate, the rostral carina, separated by lateral grooves from the lateral margins, gradually widens backward. The lateral margins of the rostrum, which is slightly directed downward, make right, though arcuate angles with the orbital margins, that, like in Ar. indicus, show no tracé at all of supra-corneal teeth ("denticules supra-cornéens"). Spine at the outer angle of the orbits as long as the eyes. Third antennular article twice as long- as the second and as long as the second and the visible part of the first taken together ; anterior margin of the first and of the second article finely denticulate, the denticles rather acute. The outer antennular flagellum consists, both in the male and in the female, of four articles, the first of which is a little longer than thick, the three following one and a half as long as thick. Stylocerite bent, acuminate, a little shorter than the antennular peduncle. The terminal spine of the scaphocerite is a little more than twice as long as broad at its base and projects a little beyond the antennular peduncle, while the scale is slightly shorter than it ; carpocerite stout, one and a half as long as wide, looked at from the lower side, and hardly as long as the antennular peduncle 32 i65 (in Ar. indicus the carpocerite is 3-times as long as thick). The telson resembles that of Ar. dorsalis Stimps. ; in the male it is 4-times as long as the posterior margin is wide, the latter not very prominent, outer angles acute, very short ; proportion between the vvidth at the base and that of the posterior margin 2,3. The longer, inner spinules near the outer angles measure one-third the width of the posterior margin and extend by half their length beyond the latter. Spinules of the upper surface small, implanted close to the lateral margins; those of the anterior pair, that are 0,07 mm. long, 1/16 of the length of the telson, are placed, in the male, twice as far from the base as from the distal end of the telson. In the outer uropod the distal extremity of the outer margin is not curved outward, different from Ar. indicus. Chelipeds asymmetrical in the male, symmetrical in the female. The merus of the larger (left) cheliped of the male is about twice as long as wide, the margins unarmed at apex. Carpus almost as long as the merus, a little less high than long, the proportion being as 9: 10 ; the lower surface is deeply hollowed out, in order to embrace the merus and this concavity is bounded at the inner side by a crest that ends in an acute tooth ; the inner surface is grooved, the groove runs parallel with the posterior margin and not far from it. Outer face triangular as in Ar. indicus, but the lower margin is straight ; the distal margin is slightly concave and a fine, impressed line runs from the middle of that margin toward the rounded, distal extremity of the infero-external margin of the merus. Chelae turned outward, the fingers placed horizontally, the dactylus at the outer side. The large chela which is as long as the carapace, rostrum included, resembles, as regards its outer form, that of Ar. indicus ; the palm is longer than high, the proportion being as 7:5, and a little longer than the fingers, measured along their axis ; the lower (outer) face of the palm is slightly convex, the upper (inner) less so. The concavity of the lower border of the chela is deeper than in Ar. indicus and the fingers that are crossing one another, are more sharply acuminate. In Ar. indicus the dactylus is unarmed and the immobile finger carries but one single tooth (H. Coutière, Alpheidae Mald. and Lacc. Archip. 1905, Fig. 135a:). In Ar. Iphianassa, however, the dactylus is armed with one tooth, the immobile finger with two. Just in the middle the immobile finger is armed with a strong tooth, which is directed obliquely forward and which is not acute, but obliquely truncate and at the inner (upper) side even slightly excavate; between this tooth and the articulation one observes another similar tooth, which is half as large and obtuse. The dactylus is armed, just in the middle, with a tooth that is slightly larger than the p r o x i m a 1 , but rauch smaller than the d i s t a 1 tooth of the immobile finger; this tooth, placed between the two of the immobile finger, is as long as broad and rounded. Merus and carpus of the small cheliped as in the large. The chela closely resembles that of Ar. indicus Cout. The fingers, measured along their axis, appear a little longer than the palm, which is 1, 3-times as long as high, the proportion between the length and the height of the chela being 2,8. Like in Ar. indicies, the dactylus is unarmed, while the cutting-edge of the immobile finger is high and denticulate. Proportion between the length of both chelae 1,1, proportion between the height of the palm of the large chela and that of the smaller 1,18. The chelipeds of the female resemble the smaller one of the male, but the high crest on the lower side of the carpus is entire, arcuate, not ending in a tooth and the fingers, 33 SIBOGA-EXPEDITIE XXXIX tf'. 22 i66 measured along their axis, are a little shorter than the palm. The left chela is slightly larger than the right, the palm of the left is precisely as long and as high as that of the small chela of the male, but, as was already remarked, the palm is a little longer than the fingers. On the lower (outer) surface of the chelae the semi-elliptical area is quite distinct; it reaches beyond the middle of the palm, the area on the larger chela being more obtuse at the far end than the other. All the chelae are marked, like in Ar. indicus, with a constriction on the outer (upper) margin of the palm, near the articulation of the carpus. Second legs stouter than those of Ar. indicus. Merus, in the male, 3,5-times longer than wide; the first segment of the carpus, which is hardly longer than the merus and 5-times as long as broad near the articulation of the chela, is 0,48 mm. long and 3-times as long as thick distally ; second segment 0,18 mm. long, third 0,14 mm., fourth 0,25 mm. Chela 0,67 mm. long, fingers a little shorter than the palm. Relative dimensions of the third legs, in the male: merus 2,1; carpus 1 ; propodus 1,7; merus 1,2 5-times as long as the propodus, 4, 3-times as long as wide and armed with a strong acute tooth, that appears a little larger than in Ar. indicus (Coutière, 1. c. Fig. d). Propodus 5, 5-times as long as wide; whereas in Ar. indicus the propodus bears only 2 or 3 spinules, one observes in Ar. Iphianassa 12 spinules along the whole length of the margin; these spinules are small, 0,07 — 0,085 mm- ^ongi there being still a much larger spinule, long 0,14 mm., at the distal extremity. In the female the propodus carries 8 spinules besides those at the distal extremity. Measured until to the end of the dorsal hook, the dactylus proves to measure one-third of the propodus and to be 4-times as long as broad near the articulation ; ventral hook half as long as the other. Relative dimensions of fourth legs: merus 2; carpus i; propodus 1,95. Merus 4-times as long as wide, the tooth at the distal extremity smaller than in the third pair ; propodus 5,8-times as long as wide, posterior margin with 6 very small spinules, 0,028 — 0,056 mm. long, besides 2 or 3 larger ones at the distal extremity. Dactylus as in the third pair. Ova of moderate size. The two specimens are of equal size, 9,5 mm. long. The young male from Stat. 142, the telson of which is damaged, agrees with the described specimens from Stat. 125, but it is a little smaller, hardly 8 mm. long. The spine at the outer angles of the orbits is, however, a little longer than the eyes and the third anten- nular article is but a little more than one and a half as long as the second and a little shorter than the second with the visible part of the first taken together. The palm of the large chela — the small cheliped is missing — appears a little longer with regard to its height than in the adult male from Stat. 125, the proportion between length and height being as 7:4. The fingers are toothed as in the adult male, but the tooth of the dactylus is smaller, decidedly smaller than the rounded, proximal tooth of the immobile finger and the large tooth of the latter is truncate, though not slightly excavate. The following legs are a little more slender than in the adult, as has been observed also in other species. Merus of second legs 4, 3-times as long as wide. Carpus 6, 3-times as long as broad or thick at the distal extremity of the fourth segment and one-fourth longer than the 34 i67 merus; first segment 0,57 mm. long and 3,6-times as long as thick at distal extremity; following segments respectively 0,14 mm., 0,13 mm. and 0,28 mm. long; chela 0,6 mm. long, compa- ratively shorter than in the adult, being but a little more than twice as long as the fourth segment ; fingers slightly shorter than the palm. Relative dimensions of third legs: merus 2, resp. 1,9; carpus 1 •, propodus 1,9, resp. 1,8. Merus 4,65-, resp. 4,7-times as long as wide, propodus 7-, resp. 6,8-times, the latter with 10 very short spinules and a somewhat longer one at the distal extremity ; the short spinules are 0,056 — 0,07 mm. long. Dactylus a little more than one-fourth of the propodus. f 2. Are te dorsa/is Stimps. Arete dorsalis W. Stimpson, in: Proc. Acad. Nat. Scienc. Philadelphia, 1860, p. 32. 1 Ar et e dorsalis Pacificus H. Coutière, in: Buil. Soc. Philom. Paris 9. V, 1903, p. 17. ? Arete dorsalis H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 866, Fig. 136, 137. Nee: Arete dorsalis J. G. de Man, in: Archiv f. Naturgeschichte. 53. Jahrg. 1888, p. 527. Stat. 78. June 10 11. Lumu-Lumu-shoal, Borneo-bank. Reef. 1 adult egg-bearing female. Stat. 213. September 26 — October 26. Pulu Pasi Tanette. Reef. 1 ova-bearing female. These two specimens, in either of which the legs of the first pair are unfortunately missing, do not quite accord with one another : the slight differences are perhaps due to the difference of age, for the adult female from Stat. 78 is 16 mm. long, the other only 9,5 mm. Perhaps, however, these specimens may once prove to belong to different species. They show also differences from Coutière's description and figures, so that I am not quite sure whether both specimens in reality appertain to the form described by that author. In a lateral view the carapace of the female from Stat. 78 appears hunch-backed, the upper border being arcuate and the rostrum strongly bent downward. Looked at from above the acute rostrum that reaches almost to the end of the second antennular article, much resembles the figure 136 of Coutière's paper, but the lateral margins regularly curve into the upper orbital margins, whereas in that figure they make a right angle with one another; looked at from above, the rostrum appears to be about one-third longer than wide at its base, the width at the base could not be measured exactly, because there are no angles. In a lateral view the spine at the outer angles of the orbits (épine extra-cornéenne of Coutière) hardly reaches to the middle of the eyes. Accordino- to Professor Coutière the length of the telson should be 3,5-times the width of the posterior margin, in both specimens this proportion is indicated by a larger number, the proportion being 4,42 in the female from Stat. 78 and 4,2 in the other specimen. Posterior margin not much prominent, outer angles acute, very short ; the inner longer spinules are hardly longer than the spinules of the upper surface and project by half their length beyond the posterior margin. The spinules of the upper surface are small, 0,1 mm. long, l/21 of the length of the telson ; they are implanted close to the lateral margins on the distal half and the posterior pair is one and a half as far distant from the posterior margin as from the anterior pair. In the female from Stat. 78 the third antennular article is nearly one and a half as 35 i68 long as the second ; the anterior margin of the first and of the second article is finely den- ticulate, but the small teeth are worn off at the tips. Outer flagellum composed of 9 articles before the bifurcation ; excepting the first these articles are broader than long. Stylocerite reaching beyond the middle of third article, with the extremity rather blunt. Different from the specimen described by Coutière, the carpocerite is as long as the antennular peduncle, not longer and hardly one and a half as long as broad, when looked at from below ; the terminal spine of the scaphocerite is twice as long as broad at its base and as long as the antennular peduncle, while the scale is a little shorter. Merus of second legs 4,64-times as long as wide. First carpal segment 5,3-times as long as thick at the distal end, distinctly longer than the sum of the three following, the proportion being as 1 : 0,8 ; first segment 1,26 mm. long, the second 0,32 mm., the third 0,22 mm., the fourth 0,48 mm.; chela 0,95 mm. long, fingers just as long as the palm. Proportion between the length of the carpus and the width of the fourth segment 9,3. Accor- ding to Stimpson and to Coutière, the first segment should be as long- as the sum of the following and the chela as long as the third and the fourth segments taken together ; in Coutière's figure, however, the first segment appears a little longer than the sum of the following and the chela a little longer than the third and the fourth segment combined. The legs of the third pair seem to accord with Coutière's specimen, excepting the merus which in his specimens is described as being 3,7-times as long as wide, but the distal extremity and the small tooth near it are exactly similar. The propodus bears 9 spinules instead of 12, that increase in length from the proximal to the distal extremity, from 0,07 mm. to 0,175 mm. The dactylus, measured to the extremity of the dorsal hook, appears a little shorter than one-third of the propodus and just 3-times longer than wide at the base ; ventral hook much shorter than the other. In the specimen from Stat. 213 the carapace is less strongly curved above and the rostrum which is acute and extends also to the end of the second antennular article, appears 1,6-times as long as broad at its base and the lateral margins, which on their posterior half are almost parallel, rejoin the supra-orbital margin by a concave curve of short radius in such a manner as to form an acute prominence, the remnant of the "épines supra-cornéennes", which are so strongly developed in Ar. Borradailei Cout.; in the much older specimen from Stat. 78 this prominence has almost fully disappeared. The antero-lateral spine of the orbits (épine extra-cornéenne) is larger than in the other specimen and reaches almost to the end of the eyes. The third antennular article is one and a half as long as the second and just as long as the second with the visible part of the first taken together; the anterior margin of the first and of the second article is finely denticulate, the small teeth are acute, whereas in the other much older specimen they are more or less worn off. The outer flagellum still only consists of 6 articles before bifurcation and these articles are a little longer than thick. Carpocerite one and a half as long as thick, as long as the antennular peduncle, not longer. Second legs a little less slender than in the other specimen and differing by the first carpal segment being as long as the sum of the following, not longer, and by the second and the third segments being equal. First carpal segment 0,63 mm. long, 4-times 36 169 as long as thick distally, second and third each 0,17 mm. long, fourth 0,31 mm.; chela 0,68 mm. long, a little longer than the second to fourth segments taken together-, palm slightly longer than the fmgers. Proportion between the length of the carpus and the width of the fourth article S. The legs of the third pair agree as regards their relative dimensions with those of the other specimen, the small tooth at the end of the merus appears a little less acute. Propodus with 10 spinules, dactylus as in the other specimen. Table A. Proportion between the length of the telson and the width of the posterior margin. Proportion between the width at the base and that of the posterior margin . Proportion between the length of the telson and the distance of the anterior pair of spinules from the posterior margin Proportion between the distances of both pairs of spinules from the posterior margin. Table B. f Merus Relative dimensions of J Carpus ( Propodus Proportion between the length of the merus and that of the propodus Proportion between the length and the width of the merus Proportion between the length and the width of the propodus of the third legs I. 2. 4,42 4,2 2,5 2,6 2,8 2,6 ',7 1,75 1. 2. i,94 i 2 2 1 I 1,8 2 1,07 1,1 4,i 4 5,6 6 The ova of the female from Stat. 78 are numerous, small, o, 6 — 0,63 mm. long, those of the other specimen are a little larger and less numerous. The female from Pulu Pasi Tanette may, as was already remarked, once prove to belong to a species different from that collected on the Borneo-bank ; it differs especially by the joints of the outer antennular flagellum being longer than thick and few in number, by the second and the third segment of the carpus being equal, by the less strongly arcuate carapace, by a smaller size and by larger ova. General distribution: Hongkong (Stimpson) ; Samoa (Coutière); Goidu Atoll (Coutière). 73. Arete Marutecnsis Cout., var. Salibabuensis de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 313. Confer: Arete Maruteensis H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 868 and in: Buil. Muséum Paris, XI, 1905, p. 18. Stat. 133. July 25/27. Anchorage off Lirung, Salibabu-island. Depth up to 36 m. Mud and hard sand. 1 specimen. As only one specimen, probably a young female, was collected, it is provisionally described as a new variety, but afterwards it may perhaps prove to belong to a distinct species. This specimen is 8,5 mm. long. The acute rostrum that is turned downward and that 37 I JO reaches a little beyond the first antennular article, is t w i c e as long as broad at its base and shows therefore a more slender form than the rostrum of Ar. Maruteensis. At either side of the rostrum one observes a slight rounded prominence, the tracé of the supra-corneal spines, which, according to the figure, are in Ar. Maruteensis acute. Second antennular article one and a halfas wide as long, s hor ter than the visible part of basal article and only half as long as the third ; stylocerite curved, acute, reaching to the transverse suture of the third article. The undivided part of the outer flagellum consists of 5 articles that are broader than long. Carpocerite a little longer than the antennular peduncle, stout, one and a half as long as thick ; scaphocerite as long as the antennular peduncle. The length of the telson equals 3,5-times the width of the posterior margin, proportion between the width at the base and that of the posterior margin 1,9. Spinules of the upper surface small, measuring 1/1B the length of the telson and placed near the lateral margins, the anterior pair a little behind the middle, the proportion between the length of the telson and the distance of the anterior pair from the posterior margin being 2,3; proportion between the distances of both pairs from the posterior margin 1,8. Posterior margin slightly convex, the outer angles obtuse; inner longer spinules measuring one-third the width of the margin. The chelipeds are equal and closely resemble the small cheliped of the female of Ar. Maruteensis (H. Coutièke, 1. c. 1905, p. 21, Fig. 4, the left). The cutting-edge of the triangular immobile finger is finely denticulate along its whole length, that of the tapering dactylus is entire. Second legs also as in Ar. Maruteensis. Merus 3-times as long as wide. Carpus 1,12- times as long as the merus, 5-times as long as thick at distal extremity; the four segments are 0,42 mm., 0,14 mm., 0,14 mm. and 0,24 mm. long. Chela 0,63 mm. long, one and a half as long as the first segment of the carpus, fingers half as long as the palm. The following legs show a somewhat less stout shape than those of Ar. Maru- teensis. Relative dimensions of the third pair: merus 2: carpus i; propodus 2. The merus is 3,35-times as long as wide, but for the rest fully resembles that of Ar. Maruteensis, being truncate at the distal extremity, with only a minute tracé of an apical tooth. Carpus twice as long as thick at the distal end. Propodus not 4-, but 5-times as long as wide, with 7 short spinules on the posterior margin and two longer ones at the far end. Dactylus one-third of the propodus, of a rather stout shape, 2,6-times as long as broad at its base; ventral accessory hook much shorter and smaller than the principal one. The ischium appears also a little less stout than in the typical species, being one-third longer than wide distally. The typical species has been observed at the island of Marutea (Paumotu-islands). Aretopsis de Man. J. G. DE MAN, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 19 10, p. 310. A new genus of the Alpheidae, closely related to Arete Stimps. Looked at from above, the rostrum appears acute, triangular, carinate, without any tracé of supra-corneal teeth ; in a lateral view it appears strongly compressed with the tip rounded, like in the genus Athanopsis Cout. Extra-corneal teeth wanting, infra-corneal teeth (outer angles of the orbits) acute, dentiform. Eyes as in the genus Arete, cornea antero-lateral, 38 I7I almost quite free and uncovered. Pterygostomian angle rounded. Pleura of the sixth abdominal somite articulate, movable. Antennal region as in Arete, but die stylocerite shorter. Only one cheliped is known, and this leg agrees with the small cheliped of Arete. Merus short, not vaginiform ; carpus short, cyathiform; chela turned outward, compressed, with both margins entire, but with a small groove on the upper (inner) face of the palm, just behind the articulation of the dactylus. Fingers shutting close together, with rather sharp, cutting-edges, that of the dactylus finely denticulate. Legs of the second pair with the carpus 5 -articulate, the five segments as in the genus SynalpJiciis, the second to the fourth being very short, equal, the first the longest, the fifth a little shorter than the first. Ischium of the following legs with a movable spine near the base. Merus unarmed at the apex of the lower margin. Dactylus biunguiculate. f 1. Aretopsis amabilis de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 311. Stat. 89. June 21. Pulu Kaniungan ketjil. Reef. 1 specimen. Looked at from above, the rostrum that extends to just beyond the first antennular article, appears acute, triangular, rather wider at its base than long, with slightly concave, divergent, lateral margins ; the upper margin that projects horizontally forward, is obtusely carinate. In a lateral view, however, the rostrum appears strongly compressed laterally, like in the genus Athanopsis, half as high as long with rounded tip and with the arcuate lower margin curving backward and downward. There is 110 tracé of supra-corneal or extra-corneal teeth, but, like in the genus Arete, the outer angle of the orbits is acute, denti- form and reaches to midway the eye; above this triangular tooth the orbital margin, i. e. the continuation of the lateral margin of the rostrum, appears concave without any prominence. Beneath the outer angle of the orbits the antero-lateral margin of the carapace is directed vertically downward and the pterygostomian angle is rounded. The upper border of the some- what compressed carapace is straight. The pleura of the sixth abdominal somite are articulate, movable. Telson moderately tapering, its length equals 3,5-times the width of the posterior margin, the latter half as wide as the greatest width near the base ; posterior margin truncate in the middle, this truncated part just half as broad as the width of the margin. There are two spinules near the outer angles that are not prominent at all; the inner, longer spinules measure a little more than one-third the width of the posterior margin, beyond which they extend by half their length ; the outer spinules measure one-fourth of the longer. The spinules of the upper surface are situated not far from the lateral margins and are rather short, measuring one-fourth the width of the posterior margin; anterior pair just before the middle, the proportion between the length of the telson and the distance between this pair and the posterior margin being 1,8; posterior pair a little farther distant from the posterior margin than from the anterior pair. Anal tubercles probably wanting. Distal margin of the uropods truncate. 39 1 72 Antennular peduncle as in Arde indicus (Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 864, Fig. 134a). Second article one and a half as wide as long, a little shorter than the visible part of the first, third article as long as the two preceding taken together. Stylo- cerite acute, reaching to the middle of median article, vvith the outer margin slightly bent. Outer antennular flagellum with 6 articles before the bifurcation and but a little longer than the peduncle; ist article very short, following a little longer or just as long as thick. Carpocerite stout, slightly longer than the antennular peduncle, a little more than twice as long as thick ; flagellum rather slender, tapering. The scale of the scaphocerite is rather broad, a little longer than the antennular peduncle, with the outer margin very slightly curved and ending in a rather strong terminal spine which is twice as long as broad at its base. External maxillipeds as in Athanas, penultimate joint rather short, terminal joint pointed, 4-times as long as broad at its base. There is but one cheliped, the right, present. Ischium tolerably slender, almost 3-times as long as thick in the middle and becoming thicker at the distal extremity. Merus a little more than one and a half as long as the preceding joint, its outer face about twice as long as broad in the middle ; this face rather rapidly widens from the proximal extremity to the middle and appears, near the carpal articulation, but a little less broad than in the middle. The upper margin is unarmed at the apex, but the lower bears in the middle 3 slender S-like shaped and movable spin u les, nearly of equal length, and that measure about one-sixth the length of the merus ; between the acute, dentiform, distal extremity and the third spinule one observes 2 or 3 setae ; the distal margin that articulates with the carpus, shows a small, triangular notch, situated a little nearer to the lower than to the upper margin. Infero-internal margin unarmed. Carpus short, about as long as the ischium, cyathiform. The chela is turned outward, the dactylus even slightly directed downward. The chela is one and a half as long as the merus and the fingers are just as long as the palm; of the palm, which is one and a half as long as wide, the outer (upper) and the inner (lower) margin are entire, the latter carinate, but one observes on the upper (inner) surface a small, oblique gr 00 v e, just behind the articulation of the dactylus. The fingers which are also distinctly compressed, shut close together and the pointed tips are crossing one another ; the dactylus appears a little less broad than the other finger, its cutting-edge is very finely denticulate from the articulation to near the tip, but the cutting-edge of the immobile finger is entire. Second legs as in the genus SynalpJieus. Merus 5-times as long as wide and nearly as long as the carpus. First segment of the carpus 3,6-times as long as thick distally ; following segments, taken together, 1, 3-times as long as the first, the second, the third and the fourth are equal, slightly broader than long, each measuring one-fourth the length of the first; fifth segment a little more than half as long as the first. Chela slightly more than twice as long as the fifth segment, fingers as long as the palm. Ischium of the three following legs with a small, movable spinule near the base. Measurements of the third legs: merus 2; carpus i; propodus 1,33. The merus is unarmed at the distal extremity of the lower margin and 3,7-times as long as wide. Carpus unarmed, 3,1-times as long as thick distally. Propodus also of a stout shape, 4,66-times as long as wide, 40 i/3 the lower margin with 8 or 9 spinules that increase in length, the longest of the three at the apex being twice as long as the first or proximal spinule. Dactylus half as long as the carpus and s/s of the propodus, 4-times as long as wide at the base ; the ventral hook, a little shorter but almost 3-times as broad at lts base as the other, has a stout shape, being only one and a half as long as broad at its base. These legs are nearly glabrous. Of the lifth legs only the three first joints are present. Length 1 1 mm. ■&* Betaeus Dana. Only one species of Betaeus was collected by the "Siboga" and this species, Bet. indicus, is new to science; it is very closely related to Bet. acquimanus Dana from New Zealand, but it differs by the frontal margin being only very slightly emarginate and by the more slender propodi of the three posterior legs. This genus comprises at present about 8 species the distribution of which is quite peculiar and limited. Bet. aequimauits Dana, which differs from the other species by the deep triang-ular emarg-ination of the front, inhabits the seas of New Zealand, Stewart Island and the Warekauri or Chatham Islands. Bet. australis Stimps. occurs at Port Jackson and differs by the frontal margin being convex and by the more slender legs. The third indopacific species is the new Bet. indicus from the Sea of Lombok, where it lives at a depth of 1 8 m. At no other localities of the whole Indopacific region a representative of this genus has hitherto been observed. The other species inhabit the west coast of America. Bet. Harrimani Rathb., in which the frontal margin is nearly straight, marked only with an almost imperceptible median sinus, occurs at Sitka, and, according to Miss Rathbun, "represents a more northern latitude than any Alpheid hitherto described". Bet. longidactylus Lock. inhabits the coast of California from San Pedro to San Diego and Bet. Harfordi (Kingsley), which, according to Professor Coutière, is identical with Bet. aequalis (Kingsley) = aequimanus Lock., ranges from Point Arena to Catalina Island. Two species, finally, occur on the west coast of South America. Bet. scabro- digitus Dana is found on the coast of Chili and has been observed at Valparaiso, Isla de Pajaros, Bay of Arauco etc, after Coutière, however, this species should be identical with Bet. emarginatus (H. M.-Edw.). The second, Bet. truncatus Dana, has been observed on the shore's of Terra del Fuego (Hermite Island) and on the west coast of Patagonia. With this species Bet. sinuosus (Guérin), recorded from Callao and the coast of Chili, should be identical and this should also be the case with Bet. laevigatus (Nicolet) from Chili. f 1. Betaeus indicïis de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 309. Stat. 34. March 27. Anchorage off Labuan Pandan, Lombok. 18 m. Coral reef. 1 ova-bearing female and 1 young specimen. Closely related to Bet. aequimanus Dana from New Zealand and representing this species 41 SIBOGA-EXPEDITIE XXXIXtf'. 23 174 in the East Indian Archipelago, Bet. indicus differs at first sight by the characters of the frontal margin. While in the New Zealand species the front is deeply emarginate, "notched about as deep as the eye-sockets" (G. M. Thomson, in: Trans. Linnean Soc. London, 1903, p. 438, PI. 28, Fig. 1), the frontal margin appears in Bet. indicus very slightlye marginate; the notch or emargination is concave at the base, not angular. The orbital hoods that are rounded above, are separated from one another by a s h a 1 1 o w triangular groove and are marked each with a fine suture, that runs from the antero-internal angle of the hoods, along their inner side, backward; the two sutures unite at the base of the eye-hoods and extend as a very narrow, linear, median groove or suture backward on the gastric region to a little beyond the anterior third of the carapace. The distinctly facetted, grayish corneae are almost entirely covered by the carapace, hardly projecting beyond the frontal margin when looked at from above ; in a side view, however, they slightly extend beyond it. At the antero-internal angle of the corneae the ophthalmopods are produced forward from under the frontal margin of the carapace and armed each with a strong, acute, triangular tooth which is directed forward and laterally compressed, appearing slightly concave at the inner, slightly convex at the outer side; these produced parts of the ophthalmopods are rounded at their inner side and separated from one another by a triangular notch, at the bottom of which one observes a small, acute, median tooth, apparently the "bec ocellaire" of Coutière. Frontal and antero-lateral margin of the carapace devoid of spines or teeth, pterygostomian angle rounded. The pleura of the second abdominal somite are very broad, those of the sixth subacute, not articulate. When Thomson's figure 2 (1. c.) of the telson is exact, Bet. indicus proves to differ especially by the spinules of the upper surface being placed nearer to the lateral margins. The telson, as long as the 6th somite, is 4,5-times as long as the posterior margin is wide ; posterior margin as in Bet. aequimauus, the outer angles appearing dentiform ; proportion between the width at the base and that of the posterior margin 2,8. The spinules of the anterior pair are 0,22 mm. long, one-tenth or one-eleventh the length of the telson, and are placed just before the middle, the proportion between the length of the telson and the distance of this pair from the posterior margin being 1,9; the posterior pair is a little farther distant from the anterior pair than from the extremity of the telson. The outer spine of the basal joint of the 6th pleopods is acute, depressed, large and reaches as far as the posterior pair of spinules on the upper surface of the telson ; outer uropod almost twice as long as the telson, the inner but very slightly shorter. Antennal region nearly as in Bet. acquimanns. Second antennular article almost as thick as long and hardly more than half as long as the visible part of the first ; third almost one and a half as long as the second ; anterior margin of the first and of the second article beset with very small spinules. The outer flagellum is composed before bifurcation of 8 articles which are all very short, much broader than long, excepting the first that is twice as long; the two flagella are subequal and as long as the carapace. The stylocerite is acuminate and almost reaches to the apex of the second antennular article. Spine at the infero-external angle of the basicerite triangular, acute, compressed, reaching almost to the apex of first antennular article. Carpocerite stout, extending beyond the antennular 42 175 peduncle by one-third of the third article; flagellum robust, tapering, one and a half as long as the carapace. Scaphocerite enlarged, the scale reaches to the middle of third antennular article, while the terminal spine, separated by a triangular notch, hardly projects beyond the rounded tip of the scale. External maxillipeds reaching to the middle of the carpocerite. Only the left cheliped is present, it is rather feeble. The merus vvhich is unarmed, with the infero-internal margin somewhat setose, is 3,2-times as long as its outer face is wide and reaches until to the pterygostomian angle of the carapace ; it is just as long as the telson. Carpus conical, with the antero-external margin notched in the middle. Chela one and a half as long as the merus, entirely inverted, so that the dactylus is placed inferiorly ; the chela is 3,3-times as long as high in the plane of the fingers and 2,75-times as long as the latter. Fincrers shuttine close together, the cutting-edg-es with a few small, acute teeth. Second legs rather stout. Merus 5-times as long as wide, carpus 1,3-times as long as the merus. The five carpal segments are 1,14 mm., 0,28 mm., 0,28 mm., 0,28 mm. and 0,74 mm. long; the first segment, 4-times as long as thick at the far end, is distinctly longer than the sum of the three following that are equal and just as thick as long, fifth segment twice as long as thick distally, a little shorter than the sum of the three preceding. Chela twice as long as the fifth segment, fingers a little shorter than the palm, which is just twice as long as broad. The second legs resemble those of Bet. acqttimanus according to Dana's figure \\a (U. S. Explor. Exped. Crust. PI. 35), but after Thomson's description the three middle carpal segments should, taken together, be equal to the first and last in length. The three posterior legs evidently differ from those of Bet. aequimanus by the more si en der propodi ; the dactyli are all biunguicula t e, which is also the case in Bet. aequi- manus, according to Coutiëre (Les Alpheidae, 1899, p. 263, Fig. 328). The measurements of the third legs are: merus 1,8; carpus i; propodus 1,8. Merus stout, 3, 5-times as long as wide in the middle ; like on the meri of the fourth and fifth pair, the posterior margin bears a movable spine near the proximal extremity. Carpus 3, 4-times as long as thick distally. The propodus which is j u s t as long as the merus, is 8, 4-times as long as broad in the middle, while in Coutière's figure the propodus of Bet. aequimanus appears only 5-times as long as broad. The propodus bears 5 or 6 very small spinules, long 0,11 mm., and 2 that are slightly curved and 0,14 mm. long, at the distal extremity. Dactylus one-fourth of the propodus, 3-times as long as broad at its base ; the slightly bent, tapering, dorsal hook is almost 3-times as long as the ventral and appears one and a half as thick at its base, notch between both hooks obtuse. In the two following legs the merus appears gradually much shorter. These legs are nearly glabrous. Ova not very numerous, 1,05 — 1,1 mm. long. This female is 20 mm. long. The other specimen is much younger, 14,5 mm. long, and has lost the legs of the first, the second and the fifth pair; it accords with the female but the stylocerite reaches hardly beyond the middle of the second antennular article and the linear groove on the carapace extends backward to beyond the middle. This specimen was sent to Professor Cöutière at 43 -: > 176 Paris, who informeel me that he regarded it as a species distinct from Bet. aequimanus Dana, and he added that even in young individuals of Dana's species the front is deeply emarginate. Betaeus australis Stimps. from Port Jackson is apparently also a different species. Alpheopsis Cout. Four species of this genus, all new to science, have been collected by the "Siboga". Alpheopsis consobrinus closely approaches to Alph. aequalis Cout., but the pterygostomian angle terminates in a small, acute tooth or spine, as in Alph. idiocarpus Cout. and Alph. Chalciope de Man, while the antennular peduncle more accords with that of Alph. aequalis var. triincatus Cout. Alph. Chalciope, the second of the four, also much resembles Alph. aequalis, as regards the first pair of legs, but the front is trispinose and the pterygostomian angle is also armed with a small, acute tooth or spine : this species therefore approaches to Alph. Haugi Cout., a remarkable form at once distinguished by the first pair of legs, the fingers of which are considerably shorter than the palm. Alph. Sibogae, the third, is a more different species. The front is trispinose like in Alph. Haugi and the antennal region also agrees with this species, but the carpocerite is slender, as long as the antennular peduncle. The chelipeds, however, are equal, project straight forward and the chelae are entirely inverted, with the dactylus placed quite inferiorly: like in the genus Amphibetaeus the dactylus bears a prominence, that fits into a deep groove of the immobile finger. The last species, finally, Alph. Etiryone, is referred with some doubt to the genus Alpheopsis, not only because the first pair of legs are missingf, but also on account of the remarkable form of the telson, which resembles that of the genus Parabefaeus. Unfortunately all the four species are only represented by one specimen, excepting Alph. Chalciope, of which two egg-bearing females were captured. The geographical distribution is the following. Alph. aequalis is rather widely distributed and has been observed at Djibouti, near Perim, in the Maldive Archipelago and at New Caledonia; the variety truncatus Cout. was found at Goifufahendu Atoll (Maldive Archipelago). Alph. fissipes Cout. and Alph. idiocarpus Cout. are only known from Providence Island near Madagascar. The four species collected by the "Siboga" are the only representatives of this genus known to occur in the East Indian Archipelago : Alph. cotisobrinus was captured near the N. E. point of Timor, Alph. Chalciope near the island of Waigeu, Alph. Sibogae in Sapeh-Strait between the islands of Sumbawa and Flores, and Alph. ? Euryoue, finally, near the Karkaralong Islands. Alph. trispinosus (Stimps.) occurs at Port Jackson, but should also be found on the west coast of Africa according to Coutière (in: Buil. Mus. Paris, 1906, p. 377). Alph. chilensis Cout. occurs on the coast of Chili and Alph. Haugi Cout., finally, is a fresh- water species, living in a small lake near the banks of the river Ogoué (French Congo), at 200 kilom. from the Sea ! Alph. consobrimis was collected at a depth of 27 — 54 m., Alph. Chalciope between 59 m. and 83 m., Alph. Sibogae in water of 70 m. and Alph?. Euryone on the reef at a depth of 23 — 31 m. They are all inhabitants of shallow water, which is also the case with the other known species. 44 i77 Key to the indopacific species of the genus Alpheopsis Cout. ay Carpus of second legs triarticulate. No extra-corneal spines. Ptery- gostomian angle terminating in an acute triangular point. Legs of first pair unknown idiocarptis Cout. (H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 1908, p. 4). ai Carpus of second legs five-articulate. bx Dactyli of three posterior legs biunguiculate. No extra-corneal spines. Legs of the first pair unknown fissipes Cout. (H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 1908, p. 3). b„ Dactyli of three posterior legs simple. cl Posterior margin of the telson straight or a' little convex. dx Chelae of first pair entire and smooth. el Front without extra-corneal spines. fx Pterygostomian angle of the carapace rounded. gx Rostrum acute aeqnalis Cout. (H. COUTIÈRE, in: Buil. Mus. Paris, 1896, N° 8, p. 380). g„ Rostrum truncate aeqnalis Cout., var. trtmcatus Cout. (H. COUTIÈRE, Alph. Mald. and Lacc. Archip. 1905, p. 868, Fig. 139). f„ Pterygostomian angle terminating in a small acute tooth. Rostrum acute. Antennular peduncle with the second article a little wider than long. Chelipeds unequal, palm of the large chela one-fourth longer than the fingers .... consobrinus de Man e„ Front trispinose. Pterygostomian angle with a small, acute tooth or spine. Chelae of the first pair in the female with the palm slightly shorter than the fingers. Three posterior legs slender, merus of third pair 8-times as long as wide . Clialciope de Man d„ Chelae of first pair more or less grooved, with the dactylus lunulate. Front trispinose. e1 Chelae of first pair entirely inverted, equal, dactylus quite inferior. No transverse groove behind the articulation of the dactylus ; cutting-edge of the dactylus with a slight promi- nence, fitting, as in the genus Amphibetaeus, into a deep groove of the immobile finger Sibogae de Man e2 Chelae of first pair unequal, dactylus at most in a horizontal plane. A deep transverse groove behind the articulation of the dactylus, the dactylus with one tooth, the immobile finger with two trispinosus Stimps. (W. STIMPSON, in: Proc. Acad. Nat. Scienc. Philadelphia, 1860, p. 32). C2 Telson terminating, like in the genus Parabctaeus, in a large, acute tooth, that measures one-ninth the whole length of the telson. No extra-corneal teeth. Rostrum acute. Legs of the first pair unknown. Euryone de Man 45 173 f i. Alpheopsis consobrinus de Man. J. G. DE MAN, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 305. Stat. 282. January 15/17. 8°25'.2S., i27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 specimen. A new species closely related to Alph. acqualis Cout. Rostrum triangular, probably acuminate, for in the only specimen which was collected, the extreme tip seems to be broken off; the rostrum, as long as wide at its base, just extends beyond the fïrst antennular article and is slightly directed downward. It is obtusely carinate above and appears in a lateral view almost 3-times as long as high at its base. At either side of the rather broad and large rostrum the frontal margin, which shows no tracé at all of extra-corneal teeth, soon curves downward and slightly backward ; the pterygostomian angle is not rounded, but ends in a small, acute tooth or spine, like in Alph. Chalciope. Viewed at from above, the large black corneae, though reaching as far as the frontal margin, prove to be entirely covered by the carapace, but in a lateral aspect the lower part of the corneae slightly projects beyond the antero-lateral margin. Upper margin of the carapace straight, rounded. The straight lower margin of the fourth and the fifth abdominal pleura terminate posteriorly in a minute, acute tooth ; those of the sixth somite are articulate, movable. Telson 5-times as long as the posterior margin is broad; width near the base twice as large as that of the posterior margin. Posterior margin almost straight, hardly a little prominent in the middle, with the outer angles acute, but not prominent ; longer internal spinules as long as the posterior margin is wide, outer spinules one-third of the inner. Spinules of the upper surface almost half as long as the posterior margin is broad ; the anterior pair immediately behind the middle of the telson, the posterior a little farther distant from the anterior pair as from the posterior margin. Antennular peduncle as in Alph. acqualis Cout., var. truncatus Cout. (H. Coutière, Alph. Mald. and Lacc. Archip. 1905, p. 869, Fig. 139^). Second article a little thicker or wider than long, the proportion being as 17:15, and a little shorter than the visible part of basal article-, third article one and a half as lono- as the second. Outer flagrellum consisting- of two articles before bifurcation, the first of which is slightly longer than the second. Stylocerite acuminate, almost reaching to the middle of third article. Carpocerite about as long as the scale of the scaphocerite, not longer ; the scale reaches to the middle of third antennular article and is rather broad, while its outer margin is straight and terminates in a spine, which, projecting straight forward, is half as broad at its base as long and extends by one-fourth of its length beyond the scale. External maxillipeds as in Alph. Chalciope. The chelipeds resemble those of Alph. aequalis, the left is much larger than the right. The short ischium, a little longer than thick, of the large cheliped bears a movable spine at the apex of its upper border, which spine is but a little shorter than the joint. The merus is rather short, its outer face is 2,8-times as long as broad at the truncate distal margin, where it shows its greatest width, though it is almost as wide in the middle. The three margins are unarmed at the apex, but on the outer face an obtuse crest or ridge runs from the 46 179 proximal extremity of the upper margin to the apex of the infero-external border. Carpus short, conical, cyathiform, with a transverse groove on the upper side near the anterior margin. Chela turned outward, 2,7 mm. long, 2,3-times as long as the merus ; the palm, which is a little longer than the fingers, the proportion being as 1 : 0,8, is nearly cylindrical ; its rounded upper (inner) surface is 2,2-times as long as wide and there are nowhere grooves or ridges. Fingers straight, shutting close together, the immovable finger a little broader than the dactylus, the rounded, outer (upper) border of which is slightly arcuate ; the cutting-edge of the immobile finger bears 9 or 10 very small, acute teeth, 3 or 4 of which in the middle are a little larger than the rest, and one observes also a few teeth on the other finsrer. Merus of small cheliped 3,1-times as long as wide in the middle, appearing here slightly wider than at the truncate, distal margin ; for the rest it resembles the merus of the other leg and there is also a movable spine at the apex of the upper margin of the preceding joint. The length of the chela is in proportion to that of the larger as 1 : 1,9, the latter being almost twice as long ; the small chela, however, is only 1 ,4-times as long as the merus. The palm of the small chela is as long as the fingers and its upper surface is 1,75-times as long as wide-, fingers as in the other leg. Second legs as in Alph. aeqtialis. Ischium 5-times as long as wide, merus one-fourth longer and 6, 2 5-times as long as wide. Carpus one-third longer than the merus, the five segments are 0,45 mm., o,iS mm., 0,2 mm., 0,2 mm. and 0,3 mm. long. The first segment, 3,75-times as long as thick at its distal extremity, is one and a half as long as the fifth ; the third is as long as the fourth, two-thirds of the fifth and the second article appears only a little shorter than the third. Chela twice as long as the fifth segment, the fingers a little shorter than the palm. Following legs as in Alph. frispinostis. The ischium of the third legs which is just as long as that of the second legs and also 5-times as long as wide in the middle, bears a movable spine in the middle and another, slightly longer, near the base. Both the merus and the propodus are about twice as long as the carpus, the propodus being only 1,06-times as long as the merus; the merus is 6-times, the propodus 10-times as long as broad and the latter bears 4 short spinules besides a longer spine, twice as long, at the distal extremity. The dactylus, that measures two-fifths of the propodus, is a little curved, simple and slender, being 7-times as long as broad at its base. The propodus of the fifth pair is just as long as that of the third, 1 i-times as long as broad, and bears 5 or 6 spinules besides the longer one at the distal extremity, but seems to be devoid of the transverse rows of setae ; the dactylus measures one-third of the propodus. Length 10 mm. f 2 Alpheopsis Clialciope de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 306. Stat. 154. August 14. o°7'.2 N., i30°25'.5E. Off the North coast of Waigeu Island. 83 m., decreased till 59 m. during the haul. Grey muddy sand, shells and Lithothamnion. 2 females with eggs. 47 i8o Rostrum slender, acuminate, almost reaching to the end of basal antennular article, with the lateral margins regularly curving toward the extra-corneal teeth ; the rostrum appears 6-times as long as wide in the middle. Extra-corneal teeth also acute, slightly directed inward, but much shorter than the rostrum, their length being in proportion to that of the rostrum as 5:18. In a lateral view the upper margin of the rostrum seems to be directed obliquely downward, the lower nearly horizontal and the height of the rostrum at its base appears then to be one-third of the length; the extra-corneal teeth are also slightly turned downward. The very black and clearly facetted corneae are entirely covered by the carapace, as in A/fik. aequalis Cout., but in a lateral view they prove to reach until to the antero-lateral margin of the carapace. Like in the genus Cheirothrix Sp. Bate the pterygostomian angle is armed with a small, acute tooth or spin e, that is directed forward and slightly upward ; this spine is barely half as long as the extra-corneal teeth. As far as I am aware, only in two other species of this genus, viz. in Alph. idiocarpus Cout. from Providence Island and in Alp/i. consobrinus de Man, the pterygostomian angle is marked by an acute triangular point. Pleura of sixth abdominal somite articulate, movable. Telson elongate, 4,7-times as long as the posterior margin is wide, the latter half as wide as the width near the base ; posterior margin as in Alph. trispinosus (vide: H. Coutière, Les Alpheidae, 1899, p. 314, Fig. 396), slightly prominent and rounded, with the outer angles not prominent at all ; the longer inner spinules measure about three-fourths the width of the posterior margin, the outer are nearly half as long. The spinules of the upper surface are almost half as long as the posterior margin is wide ; those of the anterior pair, that are nearly as far distant from the lateral margins as from the median line of the telson, are implanted just before the middle, the proportion between the length of the telson and the distance between this pair and the posterior margin being 1,8; the posterior pair is just as far distant from the anterior pair as from the posterior margin. Second joint of antennular peduncle one and a half as long as thick, equal to or slightly shorter than the visible part of basal article ; third article nearly as long as the second. Outer flagellum consisting of two articles before bifurcation, the first of which is almost twice as long as the second and twice as long as thick, while the second is hardly longer than thick. Olfactory setae well-developed. Inner flagellum composed of a little more than 40 articles. In Alph. trispinosus (Stimps.) on the contrary the second article of the outer flagellum is much longer than the first (H. Coutière, 1. c. p. 133, Fig. 120). Stylocerite slender, acuminate, reaching to the distal fourth part of median antennular article. Infero-internal crest of basal antennular article terminating in an acute spine that extends as far forward as the rostrum. Basicerite with an acute spine at the infero-external angle. Carpocerite 4-times as long as thick, about as long, not longer than the antennular peduncle; scale of scaphocerite a little longer than median antennular article, its outer margin straight and terminating in a slender, acute spine, which is twice as long as wide at its base and which, projecting beyond the scale and directed straight forward, extends to the tip of the carpocerite. Basal article of external maxillipeds 5. 6-times as long as wide, showing the same width along its whole length ; the following joint measures one-fifth of the preceding and appears twice as long as thick distally ; the distal joint, finally, is 3-times as long as the carpus, the 48 i8i spines at the distal extremity included, and 7-times as long as broad at its base ; it bears the usual, transverse rows of setae and 3 or 4 spines at the distal extremity. One of the two females has lost both chelipeds, the other supports still the right, and another cheliped is lying loose in the tube : these two chelipeds are equal. This fact, of course, does not exclude that the chelipeds may be subequal in the female, because the detached leg perhaps belongs to the other specimen. The two chelipeds are rather feeble and somewhat resemble those of A/pk. aequalis Cout. Of the detached cheliped the ischium is rather slender, 5-times as long as thick distally. The merus which is one and two-thirds times as long as the preceding joint, is also slender and also about 5-times as long as thick at the distal extremity, while the slightly curved joint gradually thickens tovvard the far end; the distal angles are obtuse, not acute as in Alph. aequalis. The carpus is short, one and a half as long as thick and measures one-third the length of the merus ; as in Alph. aequalis one observes a feeble transverse groove near the articulation of the chela. Chela 4-times as long as the carpus and two-fifths longer than the merus. The palm which is very slightly shorter than the fingers, appears a little more than twice as long as high, is somewhat compressed and shows no grooves at all, the two margins running parallel with one another; the cutting-edges of the two fingers that shut close together, bear a very small tooth near the tips, while one observes more- over on the cutting-edge of the immobile finger 3 or 4 similar, minute teeth along the middle, on that of the dactylus 1 or 2. This leg is almost 4 mm. long, two-fifths the length of the body. Second legs slender. The very slender ischium is 1 4-times as long as thick, the merus which is one-seventh shorter, 1 2-times. Carpus 1,45-times as long as the merus ; the five seg- ments are respectively 0,62 mm., 0,3 mm., 0,26 mm., 0,26 mm. and 0,3 mm. long. The first segment which is 7-times as long as thick distally, appears twice as long as the second and as the fifth that are equal, while the third and the fourth are also equal and a little shorter only than the second and the fifth; the second segment is 3-times, the fifth 2,22-times as long as thick. The chela, the fingers of which are a little longer than the palm, is just half as long as the merus and as long as the first segment of the carpus. The third legs resemble those of Alph. trispinosus (Stimps.) (H. Coutière, Les Alpheidae, 1899, p. 259, Fig. 315). The slender ischium is armed with a movable spine in the middle and with another behind it. The measurements of the three following joints are: merus 1,9; carpus i; propodus 1,8. Merus 8-times, propodus 11 -times as long as wide, the propodus with 6 feeble spinules along its whole length and 2 or 3 longer spinules at the distal extremity. Dactylus simple, measuring only a little more than one-third of the propodus, slender, 7-times as long as broad at its base, slightly curved. The fifth legs are missing. Ova few in number, 0,6 mm. long. Length 10 mm. f 3. AlpJieopsis Sibogae de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 307. Stat. 49a. April 14. 8°23'.5 S., H9°4'.6E. Sapeh-Strait. 70 m. Coral and shells. 1 specimen. This remarkable species is at once distinguished by the characteristic shape and position 49 SIBOGA-EXPEDITIE XXXIX tl '. 24 182 of the chelipeds. Rostrum triangular, projecting straight and horizontally forward, acute, short hardly reaching beyond the proximal third of the visible part of basal antennular article and almost 4-times as long as broad in the middle. Frontal margin broad, its outer angles slightly projecting forward and terminating in the extra-corneal teeth that reach to the middle of the rostrum; the distance between the acute tips of the rather small, extra-corneal teeth, which are a little directed inward, is 2,5-times as long as the length of the rostrum. In a lateral aspect the rostrum appears about half as high at its base as long. Anteriorly the orbits are quite open, the large, black and distinctly facetted corneae are entirely covered by the carapace, but in a lateral view a small lower part of the corneae extends beyond the lateral margin of the carapace. Pterygostomian angle rounded. Posterior angle of the third and the fourth abdominal pleura rounded, that of the fifth subacute ; pleura of the sixth somite small, acute, articulate and movable. Telson much tapering backward, width of the posterior margin one- fifth the length of the telson, proportion between the width at the base and that of the posterior margin 2,2 ; posterior margin rather much prominent in the middle, outer angles acute, not prominent. The longer, internal spinules are nearly as long as the posterior margin is wide, the outer are hardly half as long, but still project beyond the rounded, median part of the margin. The spinules of the upper surface are just half as long as the longer inner spinules of the posterior margin ; the anterior pair is situated immediately before the middle of the telson, the posterior pair a little farther distant from the anterior pair as from the posterior margin. Antennular peduncle slender, second joint twice as long as thick and as long as the visible part of the first, third joint two-thirds the second. Undivided part of outer flagellum composed of four articles, the first as long as thick, the second somewhat shorter, two-thirds of the first, one and a half as thick as long, third a little longer than the second, fourth as long as the first ; olfactory setae well-developed. Stylocerite acuminate, extending until to the 2nd fourth part of median antennular article. Basicerite unarmed, carpocerite slender, 6-times as long as thick and as long as the antennular peduncle, flagellum slender. Scale narrow, just reaching beyond the second antennular article, its outer margin straight, terminal spine small, twice as long as broad at its base, and reaching to the 2nd third part of the third antennular article. The chelipeds, equal to one another as regards their size and their shape, are directed straight forward, projecting by the whole length of their chelae beyond the rostrum ; they are about half as long as the body. The small and feeble merus is 1,75 mm. long, rather slender, 4-times as long as its outer surface is wide at the truncate, distal margin, and gradually thickens from the proximal to the distal extremity; the lower face is slightly concave and both the upper and the lower margin are unarmed and obtuse at apex. The carpus is short, cyathiform, anteriorly widely emarginate at each side; the anterior margin of the upper surface is slightly concave and terminates at its outer angle in an acuminate spine, that is a little directed outward, while the inner angle is obtuse; there is also an acute tooth at the inner angle of the lower surface. Like in Betaeus Harfordi Kingsley, the chelae are altogether inverted, the dactylus being placed at the 5° i83 lower side and die plane of the fingers being perpendicular to the horizontal plane and parallel with the sagittal plane of the body; the inner face of the palm is therefore situated ;U the outer side, the outer at the inner side. The chelae are 5,9 mm. long, the fingers much shorter than the palm : the proportion, indeed, between the length of the palm and that of the fingers is as 1 : 0,55, the fingers being bat a little more than half as long as the palm. The palm is nearly cylindrical, 3,45-times as long as high in the middle, showing here the greatest height of i,i mm., while the height slightly decreases toward the articulation of the fingers. The lower (upper) border of the palm bears a rather broad, though quite shallow groove that runs from the carpal articulation to the middle; a transverse groove, however, just behind the articulation of the dactylus, which is observed in Alph. trispinosus and in AlpJi. chilensis, is wanting completely. The inner (outer) face of the palm appears also slightly concave, almost along its whole length, the concavity extends from the lower (upper) border until near the upper (lower), but it gradually disappears distally ; the outer (inner) surface of the palm is convex, like the upper (lower) border, and rounded, but one observes on that surface a small excavation at the base of the immobile finger. The fingers are strongly compressed and shut close together, while the brown horny tips cross one another. The lower (upper) margin of the dactylus is distinctly curved and the dactylus shows it greatest breadth a little beyond the middle, where the cutting-edge somewhat projects, though this prominence is rounded, and, like in the genus Amphibetaeus Cout., this prominence fits into a deep groove, nearly twice as long as broad, of the immobile finger. The dactylus appears here just one and a half as high as at its base ; between the base and the prominence one observes 4 small, c o n i c a 1 teeth, of which the first or most proximal is smaller than the three following. Between the oblong groove and the articulation the immobile finger bears 6 sim il ar, small, conical teeth, the first smaller than the following, the sixth obtuse and rounded; between the groove and the tip, finally, the cutting-edge is rather sharp. The height or width of the immobile finger is nearly the same along its whole length. Ischium of second legs 7,3-times, the merus which is one-fifth longer, 8,3-times as long as wide. The five segments of the carpus which is 1,45-times as long as the merus, are 1,56 mm., 0,26 mm., 0,23 mm., 0,26 mm. and 0,44 mm. long; the first segment, as slender as the merus, being 8,6-times as long as thick at its distal extremity, is 1,3-times as long as the sum of the four following ; the second and the fourth segment that are a little longer than the third, measure just one-sixth the length of the first and the fifth is about one and a half as long as the fourth. The second segment is one and a half as long as thick. The chela is twice as long as the fifth segment, the fingers are one-fourth longer than the palm, which is one and a half as long as wide. Following legs very slender. Ischium of third legs 6-times as long as broad, with a spine at the proximal and another near the distal extremity. Measurements of the three following joints: merus 1,56; carpus i; propodus 1,34. Merus 10, 6-times as long as wide, carpus 8, 8-times as long as thick at its distal extremity, propodus 14-times as long as wide, with 4 short spinules along the posterior margin and 2 longer spinules at the distal extremity. Dactylus a little more than one-third of the propodus, almost straight, slender, 8-times as long as thick S1 184 at the articulation ; the dactylus is sim pi e, without an accessory tooth on the ventral or posterior margin, but there are two minute teeth on the distal half of the anterior, with one or two short setae implanted near each of these teeth. Measurements of the fifth legs : merus 1,33; carpus i; propodus 1,6. Merus 13-times, propodus 21-times as long as wide; carpus also very slender, 10,6-times as long as thick at distal extremity. The propodus bears 9 very small spinules along the posterior margin and 2 longer ones at the distal end; dactylus 10-times as long as thick near the articulation, measuring almost one-third the length of the propodus. Length 16 mm. f 4. Alpheopsis ? Euryone de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 19 10, p. 308. Stat. 129. July 22/23. Anchorage off Kawio- and Kamboling-islands, Karkaralong-group. Reef. 1 ova-bearing female. It is with some doubt that this species is referred to the genus Alpheopsis Cout., because the legs of the first pair are missing and because the telson shows a quite different form from that of the known species of this genus, resembling the telson of the genus Para- betaeus (H. Coutière, Les Alpheidae. 1899, p. 310, Fig. 390). Frontal region as in Alpheopsis acqiialis Cout., but the triangulair, acute rostrum which is slightly convex above and which does not yet reach to the middle of the visible part of first antennular article, appears distinctly wider than long ; as in Alph. aeqitalis the rostrum rejoins at either side the frontal margin by a regular curve, and, like in this species, there is no tracé of extra-corneal teeth, though the frontal margin makes an obtuse angle with the descending, lateral parts of the anterior margin of the carapace. Pterygostomian angle rounded. Upper surface of the carapace finely punctate. Ophthalmopods widely accessible from before. Pleura of sixth abdominal somite triangular, movable, articulate. The telson, which is one and a half as long as the sixth somite, is elongate, 2,91 mm. long and, the posterior margin being 0,53 mm. wide, it appears to be 5,5-times as long as this margin is wide; proportion between the width at the base and that of the posterior margin 2,2. Like in the genus Parabetaeus, the telson considerably narrows backward and ends in an acute media n tooth, that measures one-ninth the total length of the telson and that is a little longer than wide at its base, the proportion being as 16:13; this tooth is almost twice as broad at its base as the lateral parts of the posterior margin. These lateral parts make obtuse angles with the lateral borders of the tooth and carry two spinules, the inner longer spinule one and a half as long as the meclian tooth, the outer measuring one-third the length of the inner ; the outer angles of the posterior margin are hardly marked. The lateral margins of the median tooth are fringed with 4 or 5 setae that are even a little longer than the internal spinules of the posterior margin. Spinules of the upper surface small, measuring 1/1. the length of the telson and situated not far from the lateral margins; the anterior pair a little before the middle, the proportion between the length of the telson and the distance of the anterior pair from the end of the 52 i85 telson being as i :o,57; posterior pair but a trifle farther distant from the extremity of the telson as from the anterior pair. Antennular peduncle stout, resembling that of Alph. acqualis Cout. var. truncatus Cout. (Alpheidae Mald. and Lacc. Archip. 1905, p. 869, Fig. 139); the second article which is a little wider than long, appears a little longer than the visible part of the first and than the third article ; stylocerite acute, similar to that of the variety truncatus, but reaching only to the middle of second antennular article or hardly beyond it. Basicerite with a rather large, acute, triangular tooth or lobe at the lower side; carpocerite stout, a little more than twice as long as thick and reaching about to the middle of third antennular article ; antennal flagellum nearly twice as long as the carapace. Scaphocerite as long as the antennular peduncle, very broad like in Athanopsis, with the terminal spine very small, curved inward and not reaching beyond the rounded, anterior margin of the scale. Merus of second legs 7-times as long as wide. Carpus 1,3-times as long as the merus ; first segment 1,3 mm. long and 6,5-times as long as thick at distal extremity, second 0,24 mm. long, third 0,2 mm., fourth 0,24 mm., fifth 0,42 mm., the first segment being a little longer than the sum of the following, the proportion being as 1 : 0,85. Chela 0,81 mm. long, about twice as long as the fifth segment; fingers one-third longer than the palm. Relative dimensions of third legs: merus 1,4; carpus i; propodus 1,16. Merus 6-times longer than wide, armed, as in the genus Paraöetaeus, with 1 or 2 small spinules on the proximal half of the posterior margin, ischium also with a movable spine near the base ; carpus slender, 7-times as long as thick at distal extremity ; propodus 9-times as long as broad, with 5 spinules on the posterior margin, of which the spinule at the distal extremity is the longest of all, 0,34 mm. long, almost half as long as the dactylus; there are also 3 or 4 spinules at the distal extremity of the anterior margin, preceded by 2 or 3 smaller ones. Dactylus measuring two-fifths of the propodus and one-third 01" the merus, slender, 6, 6-times as long as thick at the base, slightly curved, simple, with 2 or 3 setae at the distal third of the anterior maro-in. These legs are slightly setose, especially the propodus. Eggs ovoid, 0,65 mm. long, one and a half as long as thick. Length 18,5 mm. Synalpheus Sp. Bate. The Russian naturalist Paulson has been the first who recognized in 1875 the generic value of the genera Alphais and Synalpheus when he observed the fact that in the latter genus the epipods of the thoracic legs are wanting. Erroneously, however, Paulson created the new genus Alpheoides for those species which are furnished with epipods, while he left the name of Alphcus to those that are destitute of these appendages. Ignorant of Paulson's paper I also recognized, thirteen years later, the close relationship of the species which are at present included in the genus Synalpheus: for the first time, indeed, the old genus AlpJmis Fabr. was divided by me into four natural groups, one of which, the Spiuifrous group, corresponds to the present genus Synalphetis (J. G. de Man, in: Archiv f. Naturg. 53. Jahrg. 1888, p. 498). In the same 53 i86 year 1888 the genus Synalpheus was created by Spence Bate, in the Report on the Macrura collected by the Challenger Expedition, for a species which he thought to be new, but which six years before had already been described by Haswell under the name of A. Comatularum: in spite of the creation of this genus, several other species which also belong to this quite natural group, were erroneously referred by Spence Bate to the old genus Alpheus. In his important and masterly treatise on the Alpheidae published in 1899, Professor Coutière has finally defmitively established the characters by which the genus Synalpheus is differentiated from the other genera of the family Alpheidae. Of the genus Synalpheus no less than 38 species and 9 varieties have been collected by the Expedition of the "Siboga", of which 22 respectively 7 proved to be.new to science ! The total number of species of Synalpheus recorded from the Indopacific region therefore now amounts to 62 species and 15 varieties. Of the 16 old species and the 2 old varieties, that were collected by the "Siboga", two, viz. Syn. Charon (Heller) and Syn. Nilandensis Cout., are apparently distributed through the whole Indopacific: the first, indeed, which was discovered in the Red Sea, has also been taken near the Hawaiian Islands, the other, at first recorded from the Maldive and Laccadive Archipelagoes, occurs also at the Mangarewa Islands, in the Pacific. Syn. amboinae (Zehntner) and Syn. carinatus (de Man) were still only known from Amboina, as was likewise the case with Syn. demani Borr., but the latter has also been observed at the Loyalty Islands; Syn. Pococki has also a limited distribution, for this species was only known from the eastern parts of the Archipelago as far as the Holothuria Bank, N. W. Australia and Torres Straits. Eight species and two varieties are also found westward from the East Indian Archipelago, but are not yet observed eastward from it. These species are the following: Syn. Gravieri Cout. Syn. heroni Cout. Syn. neomeris (de Man) Syn. streptodactylus Cout. Syn. aeauthitelsonis Cout. Syn. hastilicrassus Cout. Syn. twnidomanus Cout. Syn. biunguieulatus (Stimps.) Cout. Syn. Nilandensis Cout. var. oxyceros Cout. Syn. paraneomeris Cout. var. prolatus Cout. According to Coutière, Syn. Gravieri should also exist in the China Sea, but the occurrence of Syn. neomeris in Japan and in the Pacific is, in my opinion, still doubtful. One species, Syn. neptunus (Dana), occurs also in the Pacific and Syn. Pescadorensis Cout., that inhabits the Pescadore Islands near Formosa, has also been captured in the Maldive and Laccadive Archipelagoes. The two varieties, finally, Syn. Nilandensis Cout. var. oxyceros Cout. and Syn. paraneomeris Cout. var. prolatus, are distributed in the northwestern part of the Indian (Jccan. With regard to the range of the 24 old species and the 6 old varieties which were not collected by the "Siboga", the following may be remarked. Syn. Comatularum (Hasw.) inhabits the Albany Passage near Cape York and Thursday Island, like also Syn. Haddoni Cout., a remarkable species of which it is still doubtful whether it belongs to the Biunguieulatus or to the Lacvimanus group. Syn. Stimpsoni (de Man) is only known from Amboina, and Syn. Helleri de Man only from the Nicobar Islands, while Syn. Bakert Cout. var. S tor mi n. has still only 54 i87 been observed at Atjeh; Syn. hululensis Cout., finally, lias been recorded from th<: Red Sea, the Indian Ocean and the Pacific as far as the american coast and will therefore certainly once prove to occur also in the East Indian Archipelago. We may consequently also include these five species and this variety in the Fauna of the Indian Archipelago and we come then to the conclusion that t w o thirds of all the Indopacific species and two t h i r d s of all the Indopacific v a r i e t i e s , that are known at present, are inhabitants of the East Indian Archipelago. Fourteen species and five varieties are at present only known from the Indian Ocean and, generally speaking, from the seas situated westward from the Archipelago. They are the following : Syn. fossor (Paulson) Syn. merospiniger Cout. Syn. otiosus Cout. Syn. paraneomeris Cout. Syn. physocheles Cout. Syn. tri onyx Cout. Syn. triunguiculatus (Paulson) Syn. Mushaensis Cout. Syn. Paulsoni Nob. Syn. tricuspidatus (Heller) Syn. laticeps Cout. Syn. lophodactylus Cout. Syn. pachymeris Cout. Syn. Sladeni Cout. Syn. Stimpsonii de Man var. Maldivensis Cout. Syn. Paulsoni Nob. var. Kurracheensis Cout. Syn. Paulsoni Nob. var. liminaris Cout. Syn. Paulsoni Nob. var. Rameswarensis Cout. Syn. biunguiculatus (Stimps.) Cout. var. exi- lipes Cout. These 14 species and 5 varieties that hitherto have only been observed in the Red Sea and the northwestern parts of the Indian Ocean, are probably confined to these seas though the possibility of their existing also in the Indian Archipelago is, of course, not excluded. Syn. Albatrossi Cout. is a species only known from Laysan Island in the northern Pacific and Syn. brachyecros Nob. only from Makatea, while Syn. Bakeri Cout. and Syn. Mac-Cullochi Cout. are up to the present time only met with on the coast of South Adelaide, the latter, however, also at Port Jackson. Syn. Latastei Cout., finally, inhabits the coast of Chile, but exists perhaps also in the seas of Australia. There can be little doubt, however, that new researches, especially in the Pacific and in the seas of Japan and China, will make us acquainted with other species of which we are at present still ignorant. When looking over the new species and varieties discovered by the "Siboga", we call in the first place attention to Syn. odontophorus, a form of the Comatularum group, noteworthy by the prominent tooth with which the immobile finger of the large chela is armed. The 7 species and 3 varieties of which the Comatularum group is at present composed, are all inhabitants of the East Indian Archipelago, except only Syn. Albatrossi and Syn. Stimpsonii var. Maldivensis. Among those species of the Neomeris group, in which the dactyli of the three posterior legs are biunguiculate, Syn. Pococki is remarkable just by the form of these dactyli, because the ventral hook is very short, measuring only one-eighth the total length of the dactyli : in the new Syn. Iocasta, which is represented by numerous specimens, the dactyli have nearly the same form, SS i88 but the ventral hook is still considerably shorter. The other new species and varieties of this group closely approach to some known forms, the differences are in general not striking. Syn. Theophane of the Paulsoni group much approaches to Syn. tumidomanus (Paulson), but the spinules on the upper surface of the telson are arranged in a rectangle that is wider than long. A more interesting form is the new Syn. ancistrorhynchus from the Jedan Islands, which is related to Syn. acanthitelsonis by the shape of the telson, but the merus of the third legs bears three feeble movable spinules and the frontal spines are curved upward like barbed hooks. The characters of the two other new species, Syn. gracilirostris and Syn. hilarulus, are less conspicuous. The acquisitions made in the Biunguiculatus group are more interesting. As far as I ara aware, in all the Indopacific species of this genus the posterior margin of the 6* abdominal somite is entire. Now the expedition of the "Siboga" has discovered no less than 6 different species, all pertaining to the Biunguiculatus group, in which species the posterior margin of that somite is armed with 2, 3, 4 or 7 spines or acute teeth; these species, however, not only differ from one another by the number of teeth with which the 6th abdominal somite is armed, but also by many other features. Another remarkable form is the new Syn. bituberculatus \ represented by several specimens: different from all other species, except Syn. septcmspinosus, the large chela ends anteriorly in two conical tubercles, instead of one as usually. As a quite interesting form ought also to be considered Syn. Antenor, not only on account of the extra- ordinary slender form of the antennular and antennal peduncles, of the telson etc. but also on account of the fact that this species belongs to the largest representatives of the genus. This species, however, is not new, for it has already been described by me in 1S88 under the name of A. biunguiculatus Stimps. Except, perhaps, Syn. carinatus (de Man) var. binongcensis, Syn. odontophorus and Syn. streptodactylits, all the Indopacific species of this genus, as far as we are aware, are inhabitants of shallow water : of 1 3 species and 4 varieties, indeed, the depth at which they have been obtained, is still unknown. Twenty six species and 6 varieties have been taken not deeper than 54 m. or 30 fathoms, but four of them, Syn. Nilandensis var. oxyceros, Syn. aeauthitelsonis, Syn. biunguiculatus and Syn. Pescadorensis, like also Syn. fossor, paraneomeris, hululensis, laticeps, pachymeris and bmngtdculatus var. exilipes extend perhaps to a depth of 90 m. (H. Coctière, Alpheidae Mald. and Laccad. Archip. 1905, p. 852). The following species have also been taken in deeper water, not deeper, however, than 113 m. : Syn. consobrinus de Man Syn. odontophorus de Man Syn. neomeris (de Man) Syn. Gravicri Cout. Syn. Ipliinoë de Man Syn. streptodactylus Cout. Syn. Iocasta de Man Syn. Nilandensis Cout. Syn. Nilandensis Cout. var. bandaensis de Man Syn. hastilicrassus Cout. Syn. hastilicrassus Cout. var. Syn. triacantlius de Man Syn. qiiadrispinosus de Man Syn. trispinosus de Man. Syn. neptzmus (Dana) Syn. Antenor de Man Syn. merospiniger Cout. 56 189 We know at present that some species of this genus are sedentary animals, living on sponges, corals etc. and that they are not free swimming. This manner of life may probably account for the fact that the great majority of the species collected are only represented by a few specimens and that of several species only one single specimen has been captured. Unfortunately, except for a few species, no information is to be given with regard to the manner of life, so that I am unable to enlarge our knowledge about the biology of the numerous species existing in the Archipelago. The new variety binongcensis of Syn. carinatus (de Man) was collected on a Comatula and the new Syn. triacanthus, a single male of which has been captured at a depth of 112 m., was found living in a specimen of Solenocaulon Gray. Several species, especially among the new ones, are perhaps rare forms of a quite local distribution, but, in conclusion, the rarity of specimens of other species may be accidental. The genus Synalphms Sp. Bate has been divided by Coutière into six groups that are quite natural and that therefore are also accepted by me. The key to these groups was published in his paper, entitled: "The American Species of snapping shrimps of the genus Synalpkeus, Washington, 1909, p. 3". Excepting the Brevicarptis group, all are inhabiting the Indopacific region. List of all the Indopacific species of the genus Synalpheus , arranged according to their relationship, as indicated in the keys1). I. Comatularum group. Comatularum (Hasw.) 1882 = falcatus Sp. Bate 1888. *"amboinae (Zehntner) 1894. Stimpsonii (de Man) 1S88. Stimpsonii (de Man) var. Maldivensis Cout. 1905. *consobrinus de Man 1909. odontophorus de Man 1909. "carinatus (de Man) 1888. 3;carinatus (de Man) var. binongcensis de Man 1909. ■carinatus (de Man) var. ubianensis de Man 1909. Albatrossi Cout. 1909. II. Neomeris group. *neomeris (de Man) 1897. Gravieri Cout. 1905. Tphinoë de Man 1909. jedanensis de Man 1909. 'miscellaneus de Man 1909. *streptodactylus Cout. 1905. *streptodactyloides de Man 1909. modestus de Man 1909. Tococki Cout. 1898. Iocasta de Man 1909. paraneomeris Cout. 1905. "paraneomeris Cout. var. praedabunda de Man *paraneomeris Cout. var. prolatus Cout. 1909. *paraneomeris Cout. var. halmaherensis de Man otiosus Cout. 1908. 1909. 1909. "Charon (Heller) 1S61. Helleri de Man 19 10. *Nilandensis Cout. 1905. *Nilandensis Cout. var. bandaensis de Man 1909. 3;Nilandensis Cout. var. oxyceros Cout. 1905. triunguiculatus (Paulson) 1875. physocheles Cout. 1908. fossor (Paulson) 1S75. *fossor (Paulson) var. propinqua de Man 1909. trionyx Cout. 1908. Bakeri Cout. 1908. Bakeri Cout. var. Stormi n. 1910. 'Heroni Cout. 1909. *demani Borr. 1899. merospiniger Cout. 1908. 1) The species collected by the "Siboga" are marked with an asterisk and the new species are printed in a more heavy type. 57 SIBOGA-EXrEDITIE XXXIXö'. 25 190 ":êtumidomanus (Paulson) 1875. *Theophane de Man 19 10. s'hastilicrassus Cout. 1905. '*hastilicrassus Cout. var. de Man 19 10. *acanthitelsonis Cout. 1905. hululensis Cout. 1909. ancistrorhynchus de Man 1909. Paulsoni Nob. 1906. Paulsoni Nob. var. Rameswarensis Cout. 1908. III. Paulsoni group. Paulsoni Nob. var. Kurracheensis Cout. 1908. Paulsoni Nob. var. liminaris Cout. 1908. Mac-Cullochi Cout. 190S. *gracilirostris de Man 19 10. Mushaensis Cout. 1908. hilarulus de Man 1910. Latastei Cout. 1908. tricuspidatus (Heller) 1861. *biunguiculatus (Stimps.) Cout. 1S98. biunguiculatus (Stimps.) Cout. var. exilipes Cout. 1905. brachyceros Nob. 1906. 'amabilis de Man 19 10. lophodactylus Cout. 1908. pachymeris Cout. 1905. *bituberculatus de Man 19 10. bispinosus de Man 19 10. 'triacanthus de Man 19 10. IV. Biunguiculatus group. '*quadridens de Man 1910. quadrispinosus de Man 19 10. ■'trispinosus de Man 19 10. 'septemspinosus de Man 19 10. *neptunus (Dana) 1852. Theano de Man 19 10. laticeps Cout. 1905. Antenor de Man 19 10. 'Tescadorensis Cout. 1905. ? Haddoni Cout. 1900. V. Laevimanus group. Sladeni Cout. 1908. Key to the indopacific species and varieties of the genus Synalphetts. Comatularum group. #j Merus of the third and the fourth pair of legs with an acute tooth at the distal end of the lower margin. ól Dactylus of the small chela not shorter than the palm, curved like a hook and longer than the immobile finger. Rostrum very long, reaching nearly the end of the antennular jDeduncle Comatularum (Hasw.) (W. A. HASWELL, Catal. Australian Stalk- and Sessile-eyed Crustacea, 1882, p. 189. E. J. Miers, Report Zool. Coll. H. M. S. "Alert", 1884, p. 289. C. Spence Bate, Report Challenger Macrura, 18S8, p. 574, PI. CIII (Synalpheus falcatus)). b„ Fingers of the small chela much shorter than the palm, about half as long. cx Telson with the anterior pair of spinules situated behind the middle, close to the lateral margins. dx Front not very prominent, rostrum reaching to the middle of the 2nd or the 3rd antennular article; lower spine of basicerite as long as the supra-orbital spines; spinules of the upper surface of the telson large, 0,42 mm. long, anterior pair just behind the middle amèoinae (Zehntner) d„_ Front very prominent. 58 el Lower spine of basicerite shorter than the supraorbital spines. /j Rostrum reaching the middle of 2nd antennular article, visible part of ist article hardly longer than <>nd, ventral accessory hook of the dactylus of 3"1 pair oblique with regard to the lower margin Stimpsonii (de Man) (J. G. DE Man, in: Archiv fur Naturg. 53. Jahrg. 1888, p. 513, Taf. XXII, Fig. 3). f„ Rostrum a little shorter than ist antennular article, visible part of ist article hardly longer than 2nd, ventral accessory hook of the dactylus of 3rd pair perpendicular to the lower margin Stimpsonii (de Man) var. Maldivensis Cout. (H. Coutikre, Alpheidae Mald. and Laccad. Archip. 1905, p. 878, PI. LXXIII,fig. 16). 03 Lower spine of basicerite not shorter than the supra-orbital spines, not yet or hardly reaching to the middle of the visible part of ist antennular article, this visible part almost twice as long as 2nd article; rostrum usually a little shorter than ist article. Spinules of the upper surface of the telson small, 0,22 mm. long, anterïor pair far behind the middle. Ventral accessory hook of the dactylus of 3rd pair per- pendicular to the lower margin consobrinus de Man c„ Telson with the anterior pair of spinules situated before the middle, rather far remote from the lateral margins. Frontal and antennal region as in Syn. Stimpsonii de Man, but the stylocerite reaches only to the middle of the visible part of ist antennular article. Large chela of the female with the distal lobe on the inner side of the immobile finger not rounded as in Syn. consobrinus, but produced into an acute prominent tooth. (Male unknown) . . odontophorus de Man . a„ Merus of the third and the fourth pair of legs unarmed. ól Rostrum reaching just beyond the extremity or almost to the extremity of 2nd antennular article; rostrum carinate, the carina continued to quite near the posterior margin of the carapace. cx Rostral carina with a notch at the limit between the gastric and cardiac regdons. Ova 0,9 — 1 mm. long. Proportion between the width of the telson at base and the posterior margin 2,2 carinatus (de Man) c2 Rostral carina without a notch, telson at least 2,6-times as wide at base as the posterior margin is broad. dx Ova 1,2 mm. long carinatus (de Man) var. binongcensis de Man d2 Ova 0,4 — 0,5 mm. long carinatus (de Man) var. ubianensis de Man b„ Rostrum not carinate, very short, a little shorter than the basal antennular article. Lower spine of basicerite not attaining the extremity of the frontal spines Albatrossi Cout. (H. COUTIÈRE, in: Proc. U.S. National Museum, XXXVI, 1909, p. 89). 59 192 Neomeris group. al Dactylus of the third legs biunguiculate. ó1 Merus of the third legs armed with one or more spinules on the posterior margin. Upper angle of basicerite spinulose. cx Dactylus of the third legs with the ventral hook half as long or almost half as long as this joint. dz Small chela more than 3-times as long as high. e1 Ventral or principal hook of the dactyli of third legs making an oblique angle with the lower border; telson with the anterior pair of spinules usually situated behind the middle. ƒ-, Telson with the anterior pair of spinules situated far backward, at or near the posterior third ; stylocerite reaching to the middle or just beyond the middle of median antennular article. neomeris (de Man) /„ Telson with the anterior pair of spinules situated but a little behind the middle; stylocerite but a little longer than ist antennular article Gravieri Cout. e% Ventral or principal hook of the dactyli of third legs perpendicular to the lower border. Telson with the anterior pair of spinules situated before the middle Iphinoe' de Man d2 Small chela less than 3-times as long as high, palm one and a half as long as high. gl Telson with the anterior pair of spinules situated just in front of the middle. Dactyli of third legs as in Syn. Gravieri . jedanensis de Man g„ Telson with the anterior pair of spinules situated far backward, just at the posterior third, nearly as in Syn. neomeris; dactyli of third legs also as in this species misccllaneus de Man c% Dactylus of third legs with the ventral hook measuring about one- fourth the length of that joint. h^ Rostrum not reaching beyond basal antennular article, less than four times as long as wide at its base ; telson more than 2, 5 -times as long as the posterior margin is wide. il Rostrum usually 3-times (2,75 — 3,25) as long as wide at its base ; telson with the anterior pair of spinules situated just before the middle. Dactylus of third legs 3-times as long as thick at its base streptodactylus Cout. e'jj Rostrum 2,2-times as long as wide at its base; telson with the anterior pair of spinules situated a little behind the middle and nearer to the lateral margins than in Syn. streptodactyhes, the spinules 0,07 — 0,08 mm. long, much smaller than in this species. Dactylus of third legs 2,51- times as long as thick at its base streptodactyloides de Man 60 193 h„ Rostrum reaching to just beyond the middle of median anten- nular article, five times as long as wide at its base. Telson 2,375-times as long as the posterior margin is wide, anterior pair of spinules 0,13 mm. long, situated before the middle. Dactylus of third legs 2,5-times as long as thick at its base. modestus de Man cs Dactylus of third legs with the ventral hook measuring one-eighth the length of this joint or still less. y'j Dactylus of third legs with the ventral hook measuring one- eighth the length of this joint, the dactylus one-fourth the propodus; propodus distinctly arcuate, the concave posterior margin with only 2 or 3 short spinules, that are separated by long, smooth interspaces Pococki Cout. Js Dactylus of third legs with the ventral hook measuring l/u — 1/17 the length of this joint, the dactylus one-third, rarely two- fifths the length of the propodus; propodus nearly straight, posterior margin with 7 — 10 spinules, that are separated from one another by short interspaces Iocasta de Man è„ Merus of third legs unarmed. Upper angle of basicerite without a spine, truncate. è1 Dactylus of third legs with the ventral hook acute, conical. Merus at least 3,5-times as long as wide. /2 Proportion between the width of the telson at base and that of the posterior margin nearly 2, rarely 1,7, but in this case the carpocerite 3,54-times as long as wide. ml Median antennular article slightly longer than wide distally. nx Terminal spine of scaphocerite a little shorter than carpocerite. 01 Merus of third legs 4 — 4,5-times as long as wide . . paraneomeris Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 872, PI. LXXI, fig. 7). 02 Merus of third legs 3,56 — 3,58-times as long as wide. paraneomeris Cout. var. praedabtmda de Man n2 Terminal spine of scaphocerite a little longer than carpo- cerite paraneomeris Cout. var. prolatus Cout. m% Median antennular article a little wider distally than long. Terminal spine of scaphocerite a little shorter than carpocerite paraneomeris Cout. var. halmaherensis de Man /3 Proportion between the width of the telson at base and that of the posterior margin 1,5. Carpocerite 3-times as long as wide otiostis Cout. (H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 1908, p. 5). 61 i94 fc2 Dactylus of third legs with the ventral hook obtuse. Merus at the utmost 3,1-times as long as wide. px Ventral hook of the dactylus spoon-like excavate, anterior margin of the dactylus with a process with which the dorsal hook has coalesced. Frontal spines acute, rostrum with the margins straight and converging from the base to the tip . . . CJiaron (Heller) p„ Ventral hook of the dactylus probably not excavate, anterior margin of the dactylus probably without a process. Lateral margins of the rostrum at first parallel, further converging to the tip. Lateral teeth broader than those of Syn. CJiaron (Heller), not acuminate Helleri de Man (Syn.: A. charon J. G. de Man, in: Zool. Jahrb. Abth. f. Syst. IX, 1S97, P- 743» Taf. 35, fig. 63). a3 Dactylus of third legs triunguiculate. bx Merus of third legs with movable spinules on its posterior margin. ex Terminal spine of scaphocerite shorter than carpocerite. Lower spine of the basicerite about as long as basal antennular article. dx Dactylus of third legs stout, about 1,5-times as long as broad at its base, the principal hook perpendicular to the axis of the joint Nilandensis Cout. d2 Dactylus of third legs 2,5-times as long as broad at its base, the principal hook directed obliquely forward .... Nilandensis Cout. var. bandaensis de Man c„ Terminal spine of scaphocerite longer than carpocerite. Lower spine of the basicerite reaching to apex of median antennular article Nilandensis Cout. var. oxyceros Cout. b% Merus of third legs unarmed. ex Spinules of the upper surface of the telson quite distinct. Propodus of third legs spinulose along its posterior margin. dx Dactylus of third legs with the ventral hook measuring three- fourths the principal, being almost as long as it. ex Fingers of large chela of moderate length, their length in proportion to that of the chela as 1 : 3,5. Carpocerite 4,3 — 4,5-times as long as wide triunguiculatus (Paulson) (Confer: G. Nobili, in: Buil. Scientif. France et Belgique, XL, 1906, p. 25). e„ Fingers of large chela extraordinarily short, their length in proportion to that of the chela as 1 : 5,33. Carpocerite 5-times as long as wide physocheles Cout. (H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 190S, p. 10). 62 195 da Dactylus of third legs with the ventral hook much shorter than the principal. e1 Carpocerite more than 4,5-times as long as wide. fx Carpocerite 6- or almost 6-times as long as wide. Palm of larger chela with an obtuse tubercle at the distal extremity. Smaller chela 2,4 — 2, 6-times as long as high. Merus of third legs 2,8 — 3-times as long as wide fossor (Paulson) (PAULSON, Studies on the Crustacea of the Red Sea, (in Russian), Kiew, 1875, p. 103, pi. 13, Fig. 5. — Confer also: H. COUTIÈRE, Alpheidae Mald. and Lacc. Archip. 1905, p. 872, PI. LXX, fig. 6). f„ Carpocerite 4, 6-times as long as wide. Palm of large chela with an obtuse tubercle at the distal extremity. Small chela 2,73 — 3,2-times longer than high. Merus of third legs 3,4 — 3, 6-times as long as wide. fossor (Paulson) var. propinqua de Man f„ Carpocerite 5-times as long as wide. Palm of large chela spinous at the distal extremity. Small chela 3-times longer than high. Merus of third legs 4,4-times as long as wide trionyx Cout. (H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 1908, p. 6). es Carpocerite about 4-, or less than 4-times as long as wide. Ventral hook of the dactylus of third legs measuring hardly one-fourth the principal one. fY Carpocerite 3, 6-times as long as wide. Merus of third legs more than 3-times as long as wide. gy Palm of large chela unarmed at the distal extremity. Merus of third legs 3,5-times as long as wide . . Baker i Cout. (H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 1908, p. 9). £■„ Palm of laree chela terminatingf in a small conical tooth. O il ö O Merus of third legs 4-times as long as wide. Bakeri Cout. var. Stormt n. /2 Carpocerite about 4-times as long as wide. Palm of larger chela with an obtuse tubercle at the distal extremity. Merus of third legs 2,32 — 2, 6-times as long as wide . hcroni Cout. C2 Spinules of the upper surface of the telson wanting or quite rudimentary. Propodus of third legs without spinules on its posterior margin, excepting 2 or 3 at the distal end . . . demani Borr. Paulsoni group. ciy Carpocerite elongate, 4- or more than 4-times as long as wide. Posterior angles of telson often spinous. bx Merus of third legs unarmed. Lower spine of basicerite a little shorter than the stylocerite. 63 196 c, Posterior angles of the telson decidedly spinous, at least half as long as the outer spinules. dx Carpocerite slender, not thickened in the middle. ex Terminal spine of scaphocerite as long as the carpocerite, upper angle of basicerite spiniform. Third antennular article shorter than second. Distance between the posterior pair of spinules of the upper surface of the telson and the median part of the posterior margin hardly more than half as long as the posterior margin is wide. Eggs very large, giving rise to mysis tumidomanus (Paulson) £3 Terminal spine of scaphocerite distinctly longer than the carpocerite, upper angle of basicerite spiniform. Third anten- nular article as long as second. Posterior pair of spinules just as far distant from the median part of the posterior margin of the telson as this margin is wide ; spinules of the upper surface rather far distant from the lateral margins, inserted at the angles of a rectangle that is wider than long. Eggs rather numerous, 0,75 — 0,8 mm. long . Theophane de Man ds Carpocerite a little thickened in the middle, ovoid. Terminal spine of scaphocerite as long as the carpocerite. Third antennular article shorter than second. el Upper angle of basicerite truncate. Posterior angles of the telson about as long as the median part of the posterior margin. Distance between the posterior pair of spinules and the median part of the posterior margin but a little shorter than the width of the latter or just as long. fx Length of the large chela in proportion to that of the fingers as 4,2 : 1 hastilicrassus Cout. /„ Length of the large chela in proportion to that of the fingers as 2,9 : 1 hastilicrassus Cout. var. e„ Upper angle of basicerite spiniform, sometimes only acute. Posterior angles of the telson longer than the median part of the posterior margin. Distance between the posterior pair of spinules and the median part of the posterior margin rriuch shorter than the width of the latter, usually two- thirds or three-fourths, rarely oniy one-sixth acanthitelsonis Cout. c„ Posterior angles of telson acute, though not spinous, hardly one- fourth the length of the outer spinules. Carpocerite slender, 3,8 — 4,1-times as long as wide, not thickened in the middle, as long as the terminal spine of the scaphocerite. Third anten- nular article shorter than second. Upper angle of the basicerite 64 197 liululensis Cout. spiniform, lower spine one and a half as long as the basal part. Palm of large chela unarmed at distal extremity (Synon. : Syn. tumidomanus H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. S76, PI. LXXIII, fïg. 14. — Confer also: H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 1908, p. 12 and in: Proc. U.S. Nat. Mus. XXXVI, 1909, p. 24). /;., Merus of third legs armed with 3 feeble, movable spinules on the distal third of the posterior margin. Lower spine of basicerite as long or slightly longer than the stylocerite, upper spine small. Frontal spines short, acute, with the tips curved upward like barbed hooks. Terminal spine of scaphocerite shorter than the carpocerite. Posterior margin of the telson as in Syn. acanthi- tclsonis Cout ancistrorhynchus de Man 6 carpus almost half as long as the merus, 3-times as long as thick and with 2 small, movable spinules, long o, 18 mm., at the far end of its posterior border. Propodus twice as long as the carpus, 8,4-times as long as broad, its posterior margin armed with 15 small spinules and both margins beset with tufts of rather long setae; dactylus one-sixth the propodus, differing from that of Syn. Stimpsonii by the accessory claw that makes a right angle with the posterior margin and that appears almost as thick as the principal claw; the latter appears more slender than in the figure 3^ of my quoted paper. The carpus and the merus are also setose along their margins. While the merus of the 4th legs bears the same tooth as that of the 3rd, in the 5th legs this joint is unarmed, like as in Syn. Stimpsonii. The male from Stat. 282, of the same size as the preceding one, fully accords with it, but the large cheliped is missing. Brachium of small cheliped 4-times as long as broad, upper margin terminating in a small, acute tooth, the lower margins as in the large cheliped. Small chela half as long as the carapace, 4-times as long as high, fingers half as long as the palm, shutting together and of equal length. The egg-bearing female has also nearly the same size, but the rostrum reaches the end of first antennular article. Eggs ovoid, not very numerous and rather large, o, 7. mm. long. The male from Stat. 91 is 15 mm. long. Rostrum one and a half as broad at its base as it is long, a little shorter than first antennular article, orbital spines also as in the type. This is also the case with the antennal and antennular peduncles, but the visible part of the first antennular article appears only one and a half as long as the second. Telson typical, 4,3- times as long as its posterior margin is broad, the width of the latter one-third the width at the base ; spinules on the upper surface typical. The large chela, however, closely resembles that of Syn. Stimpsonii (de Man, 1. c. fig. 3 a), the dactylus has quite the same form and the cutting-edge is entire. The following legs agree also with this species, for the 3ld — 5th legs are of a somewhat stouter shape than those of the typical specimens from the Stations 213 and 282. So e. g. the merus of 3vd legs appears 5-times as long as broad, the carpus is almost half as long as the merus, 3-times as long as thick and bears 3 short spinules at the far end of the posterior margin ; the propodus is almost twice as long as the carpus and 6-times as long as broad; the accessory hook, finally, of the dactylus, though being also at a right angle with the posterior margin, appears somewhat smaller. In the ova-bearing female from Stat. 91 which has the same size as that from Stat. 282, the rostrum just reaches beyond the first antennular article, the visible part appears as long as in the preceding male. The stylocerite reaches to the 2nd third of second antennular article. The carpocerite is somewhat longer than the antennular peduncle, the blade of the scaphocerite reaches to the tip of that peduncle, but the terminal spine, that extends as far forward as the carpocerite, projects only with xjs or 1/9 of its length beyond the tip of the blade, but is not curved inward. Telson typical, but only 3,8-times as long as its posterior margin is broad. It appears doubtful whether the large cheliped that is lying loose in the bottle, belongs really to this female; the infero-internal margin of the brachium is namely armed with a strong acute tooth at the far end, the anterior border of the upper face of the carpus bears three acute teeth and the posterior border ends in a strong acute tooth; the fingers are shorter, the dactylus 74 207 shorter than the immobile finger and its upper margin is more strongly arcuate. The eggs are a little larger than those of the typical female from Stat. 282, they are 0,9 mm. long. The young male from Stat. 305 is 1 1 mm. long. The rostrum extends to the middle of second antennular article, but the orbital spines that are a little turned outward, measure but one-fourth the length of the rostrum. The antennular peduncle fully agrees with my figure 3 (1. c.) of Syn. Stimpsonii^ the visible part of the first article is but one-fourth longer than the second, but the stylocerite is somewhat shorter than the first article. Carpocerite a little longer than the antennular peduncle, the blade of the scaphocerite reach.es only to the end of the second article and the terminal spine, that is not curved inward and that extends by one-third of its length beyond the tip of the blade, appears as long as the antennular peduncle. The lower spine of the basicerite reaches a little less forward than the orbital spines. The telson is typical, 4-times as long as the posterior margin is broad, width at the base 3-times as broad as the posterior margin ; the spinules of the upper face are arranged as in the typical specimens from the Stations 213 and 282. The larger cheliped resembles that of Syn. Stimpsonii, the other chela is hardly half as long as the larger and much smaller. First carpal segment of 2nd legs a little shorter than the sum of the four following, the 2nd — 4th segments are equal in length. The following legs show the same somewhat stouter shape as the specimens from Stat. 91, but the almost rudimentary accessory claw of the dactylus is directed as in the figure 3 c of my quoted paper. The female, collected by Mr. van Nouhuys east of Segli, is 24 mm. long and larger than all the specimens collected by the "Siboga"; in its features and outer appearance it much resembles the egg-bearing female from Stat. 91. The eggs are also 0,9 mm. long. The frontal spines are abnormally developed. The rostrum that just reaches beyond the ist antennular article, is slightly turned to the right and bears, just behind the middle of its left margin, a small, acute spine, somewhat directed outward ; the right orbital spine is directed straight forward, but the left distinctly outward. At either side of the body the lower spine of the basicerite is slightly turned outward and appears as long as the lateral frontal spines. The visible part of ist antennular article is one and a half as long as the 2nd and the 2nd almost twice as long as the 3rd. The stylocerite of the left peduncle extends to the apex of ist article and its tip is slightly curved outward; the stylocerite of the right peduncle, however, is directed straight forward and decidedly a little shorter than ist article. The carpocerite hardly reaches a little beyond the antennular peduncle, the terminal spine of the scaphocerite is as long as this peduncle and the scale reaches just beyond the apex of the 2nd article. Unfortunately the large cheliped is wanting, the smaller fully agrees with that of the female from Stat. 91. The upper margin of the merus terminates in a small spine, fingers hardly more than half as long as the palm. First segment of the carpus 5,6-times as long as wide at the distal extremity, its length in proportion to the sum of the four following segments as 113 194, 2nd segment just as long as the 4th and slightly longer than the 3ld, 5* segment almost twice as long as the 2nd, chela a little more than twice as long as the 5th segment, fingers one-third longer than the palm. The measurements of the 3rd legs are: merus 2,1; carpus i; propodus 1,8. Merus 5,5-times longer than wide, propodus 7,25-times; the propodus 75 208 bears 16 rather short spinules, that are 0,2 mm. long, on the outer side of the posterior margin, while, along the distal third of the joint, each spinule is accompanied by another on the inner side of the margin. The ventral hook of the dactylus is broken off and the other leg is missing. These legs are very setose. The telson shows also the same measurements as the female from Muaras-reef. The length equals 3,78-times the width of the posterior margin and the latter measures one-third the greatest width. The spinules of the upper surface are 0,26 mm. long, proportion between the length of the telson and the distance of the anterior pair from the posterior margin 2,7, proportion between the distances of both pairs from the posterior margin 1,73. Remarks. The form which was referred by Schenkel to a variety of Syn. Stimpsonii (in: Beitrag zur Kenntniss der Dekapodenfauna von Celebes, 1902, p. 567, PI. XIII, fig. 22a — c), seems really to belong to this species and not to Syn. consobrinus, because the terminal spine of the scaphocerite hardly reaches beyond the blade and because it is curved inward. Further researches must decide whether Syn. consobrinus and Syn. Stimpsonii are indeed different species or whether Syn. Stimpsonii is a much variable form as regards the terminal spine of the scaphocerite extending more or less far beyond the blade, as regards the length of the visible part of first antennular article, as regards the length of the lower spine of the basicerite in proportion to the orbital spines, as regards the shape of the 3rd — 5th legs etc. f 3. Synalphens odontophorus de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 113. Stat. 6sa. May 6. Near Tanah Djampeah. From 400 m. upward to 120 ra. Pale, grey mud, changing during haul into coral bottom. 1 egg-bearing female. Stat. 260. December 16 and 18. 5°3Ó'.5S., I32°55'.2E. ■ 2,3 miles N. 630 W. from the North point of Nuhu Jaan, Kei-islands. 90 m. Sand, coral and shells. 1 egg- bearing female. Stat. 289. January 20. 9°o'.3 S., I2Ó°24'.5E. 112 m. Mud, sand and shells. 1 egg-bearing female. A new species of small size, characterized by the inner, upper side of the immobile finger of the large chela being- armed with a characteristic strong tooth. Frontal region prominent as in the other species of this group, rostrum acute, one-sixth, one-seventh or even still less, longer than broad at its base and reaching to the middle or to the distal third or fourth part of 2nd antennular article; rostral carina prominent, though rather obtuse, and separated by rather deep grooves from the orbits to the base of which it reaches; length of the rostral carina two-fifths the length of the carapace, rostrum included. The orbital spines that project, like the rostrum, straight forward, are short and measure only one-fourth the length of the rostrum ; they are slightly directed outward. First abdominal pleura truncate, second and third rounded, fourth and fifth subacute, sixth acute. In the specimens from the Stations 260 and 289 the telson is 4,5-times, in that from Stat. 65a 4-times as long as the posterior margin is broad and in all the specimens the greatest width anteriorly is 3-times as broad as the posterior margin, the lateral margins converging rather strongly ; the outer angles of the posterior margin are acute, though not prominent and 76 209 the posterior margin projects bul little in the middle; the longer, inner spinules measure two thirds the width of the posterior margin. As regards the arrangement of the spinules of the upper surface, that are o, 1 6 mm. long, the three specimens do not agree with one another. In the female from Stat. 2S9 the two anterior spinules either of which is situated almost as far from the lateral margin as from the mid-line, are inserted at the anterior third and the posterior pair is nearly twice as far distant from the posterior margin as from the anterior pair. In the two other specimens the anterior pair is situated a little more backward, its distance from the posterior margin being three-fifths the length of the telson and in both specimens the posterior pair is situated just m i d w a y between the posterior margin and the anterior pair. Inner uropod 1,6-times as long as broad. Second joint of antennular peduncle one-fourth shorter than the visible part of the first, third joint a little shorter than second; the acute stylocerite that distinctly projects beyond the orbital spines, reaches to the middle or to the distal third of the visible part of first antennular article. Lower spine of basicerite small, reaching to or hardly beyond the base of the rostrum proper, upper spine half as long; both spines are sometimes directed outward. Carpocerite hardly longer than the antennular peduncle and of a rather stout shape, appearing 3,2-times as long as broad when measured at the lower side; the rounded tip of the blade reaches to the middle of third antennular article, but the terminal spine of the scaphocerite, the outer margin of which is slightly concave, is not curved inward, extends by one-fifth of its length beyond the tip of the blade and reaches as far forward as the carpocerite. The external maxillipeds extend to the end of second antennular article. Of the large cheliped of the female the merus is 2,4-times as long as broad, its upper margin ends in a small, acute tooth, the apices of the two lower margins are also acute, though presenting no proper tooth. The lower side of the very short carpus is produced into a long acute tooth and one observes a smaller, acute tooth on the anterior margin of the upper side. Chela a little, viz. one-seventh, longer than the carapace, rostrum included, much resembling that of Syn. consobrinus, 3,17-times as long as high, presenting its greatest height at the proximal third. Fingers a little less than half as long as the chela, the palm about one and a half as long as the fingers, the chela being 2,63-times as long as the fingers and the palm being in proportion to the fingers as 1 :o,6i. The palm is everywhere rounded, somewhat narrowing distally and bears, as in Syn. consobrinus, a small, acute tooth at the far end of its inner (upper) face. As regards the shape of the dactylus and of the lower (outer) face of the immobile finger, this species does not differ from Syn. consobrinus, but this is not the case with the upper (inner) side of the immobile finger. The distal lobe, indeed, is much larger, not rounded as in Syn. consobrinus, but produced into an acute tooth which is directed obliquely upward and forward. The distal half of this finger is, moreover, considerably broadened and, as the distal margin of the lobe runs obliquely downward, the immobile finger appears excavate, when the fingers are looked at from the tips. Merus of small cheliped somewhat more slender than that of the larger, 3,7-times as long as broad, armed in the same manner; carpus thicker, upper border with an acute tooth; 77 2IO chela very small, its length being only one-third that of the larger, fïngers just half as long as the palm, vvhich is unarmed and twice as long as high. First carpal segment of 2nd legs 5-times as long as thick, 1,2 mm. long, slightly shorter than the sum (1,4 ram.) of the four following segments; the three following subequal, the fifth as long as the third and the fourth taken together; the chela, the fingers of which are longer than the palm, is somewhat more than one and a half as long as the fifth segment. Merus of third legs 5, 5-times as long as broad, armed with a rather small, acute t o o t h at the distal end of posterior margin ; carpus almost 3-times as long as thick distally, with a small spinule, long 0,09 mm., at the far end of the posterior margin. Propodus twice as long as the carpus, almost 7-times as long as broad, its posterior margin presenting 16 small spinules; dactylus one-fifth the propodus, of a rather stout shape, 3-times as long as broad at base, with a small, ventral, accessory claw that is half as long and half as broad as the principal and that makes an obtuse angle with the posterior margin. Apical tooth of the merus of 4th legs smaller than that of the 3rd, merus of 5th legs unarmed. Eggs few in number, ovoid, large; those of the female from Stat. Ó5a are 1 mm. long, whereas the eggs of the specimens taken at the Stations 289 and 260 are respectively 0,75 mm. and 0,7 mm. long. Length of the ova-bearing female 1 5 mm., the three females are of the same size. f 4. Synalpheus carinahis (de Man). Alpkeus carinatus J. G. de Man, in: Archiv f. Naturg. Bd. 53. 1888, p. 508, PI. XXII, fig. 2. Alplieus carinatus L. Zehntner, Crustacés de 1' Archipel Malais, Genève 1894, p. 201. Alpkeus carinatus H. Coutière, in: Notes from the Leyden Museum, Vol. XIX, 1898, p. 206. Nee: Synalpheus carinatus J. Pearson, On the Macrura, in: Herdman's Report on the Pearl Oyster Fisheries, 1905, p. 83, PI. II, fig. 9. Stat. 33. March 24/26. Bay of Pidjot, Lombok. 9 — 22 m. Mud, coral and coralsand. 1 ova- bearing female of medium size and 1 still younger male. Stat. 181. September 5/1 1. Ambon-anchorage. Reef. 1 adult, ova-bearing female. Stat. 282. January 15/17. 8°25'.2 S., I27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 young female without eggs and 1 still younger male. Stat. 315. February 17/18. Anchorage East of Sailus Besar, Paternoster-islands. Depth up to 36 m. Coral and Lithothamnion. 1 very young specimen. The adult female from Amboina is 34 mm. long from tip of rostrum to the end of the telson. The rostrum hardly reaches beyond the 2nd antennular article and is very slightly upturned at the tip ; rostral carina sharp, prominent, reaching to near the posterior margin of the carapace and distinctly notched at the limit between the gastric and cardiac regions. Orbital spines half as long as the rostrum, parallel and directed obliquely upward; their carinae are traceable to beyond the micldle of the carapace, but they are obtuse and much less prominent than the median carina; the inner, lower margin of the left orbital spine bears two acute teeth, an abnormality indeed, for in this species the orbital spines are simple and unarmed. The pleura of the 4th — 6th somites end in a pointed tooth. Telson 3,41-times as long (4,3 mm.) as its posterior margin is broad (1,26 mm.), its greatest width (2,76 mm.) a little 78 2 1 I more than twice as broad as the posterior margin. The distance between the anterior pair of spinules and the posterior margin is in proportion to the length of the telson as 0,43:1; these spinules being situated even a little more forward than in my figure 2 a (1. c), in accordance with the large size of this specimen. Brachium of small cheliped more slender than that of the large, the upper margin and the infero-external margin terminate in an acute, pointed tooth, bat instead of the posterior tooth that is observed on the infero-external margin of the merus of the large cheliped, there is a small, obtuse prominence. Carpal segments of the left leg of the 2nd pair (the right is missing) 3,3 mm., 0,8 mm., 0,7 mm. 0,65 mm. and 1,12 mm. long; the chela is 1,8 mm. long (palm 0,8 mm., fingers 1 mm.). In this full-grown specimen the first segment appears even very slightly longer than the four following taken together. In the three posterior legs the ischium is unarmed. In my original description nothing is said about the eggs: in this specimen they are very numerous, ovoid, 1 mm. long, 0,6 mm. thick. The egg-bearing female from Stat. 33 is 24,5 mm. long, the ova are 0,9 mm. long, and the telson is more narrowed posteriorly, being 43/3-times as long as its posterior margin is broad. In Syn. carinatus the proximal extremity of the S-like curved, outer margin of the scaphocerite is produced into a spine: in the adult female from Amboina this spine is rather small and directed outward, in the young male from Stat. 33 it is well-developed and directed straight forward. This spine is often broken off. In the young specimen, long 12 mm., from Stat. 315 the rostrum reaches almost the end of second antennular article, but the rostral carina only extends- to the posterior fourth of the carapace. The first carpal segment of the 2nd legs is much shorter than the sum of the four following. Remarks. The specimen which was referred by Zehntner to this species, was examined by me and no doubt belongs to this species. The rostrum that appears somewhat asymmetrical, is apparently regenerated. The species, however, which was referred by Pearson to Syn. carinatus, is certainly another, the second antennular article is hardly shorter than the first, the telson has a quite different form etc. General distribution: Amboina (de Man, Zehntner). j 4a. Synalpheus carinatus (de Man) var. binongcensis de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. III. Stat. 220. November 1/3. Anchorage off Pasir Pandjang, West coast of Binongka. 55 m. Coral sand. 1 ova-bearing female, collected on a Comatula. This specimen, 25 mm. long, is described as a variety, because the ovoid eggs are larger, 1,2 mm. long, and less numerous than those of the female taken at Amboina, which was referred to the typical species. The rostrum, reaching almost to the end of second anten- nular article, is continued to near the posterior margin of the carapace, but, different from the typical female from Amboina, is not notched at the limit between the gastric and cardiac regions. The carinae of the orbital spines that are half as long as the rostrum, slightly convergent, 79 2 12 but in a less degree turned upward than in the female from Amboina, may be foliowed to the middle of the carapace. The telson has a different form, its posterior margin (0,78 mm.) measures just one-fourth the length (3,12 mm.), but anteriorly the telson appears broader, 2,6- times as broad (2,04 mm.) as the posterior margin; the spinules of the upper surface are inserted a little more backward, the proportion between the length of the telson and the distance between its posterior margin and the anterior pair of spinules being as 1 : 0,36. Otherwise as in the typical species the carpocerite appears longer, extending beyond the antennular peduncle by one-half the third article. The large cheliped is missing, the following legs are as in the typical species. \b. Synalpheus carinatus (de Man) var. ubianensis de Man. J. G. de Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 111. Stat. 99. June 28/29/30. 6°f.$ N., i2o°26'E. Anchorage off North-Ubian. 16 — 23 m. Litho- thamnion-bottom. 1 ova-bearing female. Stat. 220. November 1/3. Anchorage off Pasir Pandjang, West coast of Binongka. Reef. 1 ova- bearing female and 1 younger male. It is again because of the size of the eggs that these specimens are considered as a distinct variety: the ova are namely very small, 0,4 — 0,48 mm. long, and a little less thick. The female from NortlvUbian is 2 1 mm. long, the two other specimens are of a somewhat smaller size. Rostrum and orbital spines as in the typical species, the rostrum just reaching beyond the second antennular article, but the carinae of the orbital spines are inconspicuous and the rostral carina is not notched. Telson in the female from Stat. 99 47/16-times, in that from Stat. 220 4,8-times as long as the posterior margin is broad ; in the former the proportion between the greatest width near the base and that of the posterior margin is 2,6, in the specimen from Stat. 220 just 3. The anterior pair of spinules of the upper surface are inserted just in front of the posterior third, the proportion between the length of the telson and that distance from the posterior margin being in the female from North-Ubian 2,84, in the other 2,6. Thoracic legs as in the typical species, but the second, third and fourth carpal segments of the second legs are of equal length, the second being hardly longer than the third or the fourth. II. Neomeris group. f5. Synalpheus neomeris (de Man). Alpkeus minor, var. neptunus Dana, J. G. de Man, in: Journal Linnean Soc. London, XXII, 1888, p. 272. Alpkeus neomeris J. G. de Man, in: Zoolog. Jahrb. IX. Abth. f. Syst. 1897, p. 734 (partim). Synalpheus neomeris G. Nobili, in: Buil. Scientif. France et Belgique, XL, 1906, p. 25. ? Synalpheus neomeris H. Coutière, Les "Alphéidae", 1899, p. 259, fig. 318 and in: Alpheidae Mald. and Laccad. Archip. 1905, p. 869, PI. LXX, fig. 1 and in: Buil. Soc. Philom. Paris, 1908, p. 5. Nee: Synalpheus neomeris J. G. de Man, in: Abhandl. Senckenb. Naturf. Ges. XXV, 1902, p. 891. So 213 Stat. 96. June 27. South-east side of Pearl-bank, Sulu-archipelago. 15 m. Lithothamnion- bottom. 1 male of medium sizc. Stat. 99. June 28/29/30. 6°7'.5 N., I20°26'E. Anchorage off North-Ubian. 16 — 23 m. Litho- thanmion-bottom. 1 adult male and 1 adult, ova-bearing female. Stat. 164. August 20. i°42'.5 S., I30°47'.5 E. 32 m. Sand, small stones and shells. 3 adult, ova-bearing females and 2 younger males. Stat. 258. December 12/16. Tual-anchorage, Kei-islands. 22 m. Lithothamnion; sand and coral. 25 specimens, males and ova-bearing females and young specimens. Stat. 299. January 27/29. io°52'.4S., I23°i'.iE. Buka- or Cyrus-bay, South-coast of Rotti- island. Depth up to 40 m. Lithothamnion. 1 adult male. Stat. 320. February 23. 6°s'S., U4°7'E. Java Sea. 82 m. Fine, grey mud. 1 young specimen. In my Report on the Podophthalmous Crustacea of the Mergui-Archipelago, published in [888, six specimens, 3 males and 3 females, of unequal size were referred by me to A. minor Say var. neptunus Dana. Two of these specimens, a male and an ova-bearing female, both 1 7 mm. long, preserved in my private collection, are lying before me. It was on these specimens from the Mergui-Archipelago that Syn. neomeris was founded by me in 1S97 (1. c). In this paper 9 other specimens of smaller size, collected by Capt. Storm on the coast of Atjeh, were also referred by me to this Syn. neomeris, but, as I now see, erroneously, for this Atjeh form, specimens of which are also lying before me, proved after a careful examination to belong to another species, viz. to Syn. streptodactylus Cout. In this paper of 1897 the figures 61a (large chela of the male), 6id (third leg of the male) and 61e (dactylus of this leg) are relative to the true Syn. neomeris, but the figures 61, 6iö and 6 ir to Syn. streptodactylus. Many an author has probably been misled by this figure 61, which indeed does not represent Syn. neomeris. According to my description of 1888 the second antennular article should be "scarcely longer than the ist"; in the typical male of Syn. neomeris, the cotype, that is lying before me, the second article, 1 mm. long and 0,6 mm. thick, appears a little shorter than the visible part, long 1,1 mm., of the hrst article, but in the female this visible part appears just as long as the second article, namely 0,9 mm. In all the specimens, collected by the "Siboga", the second article appears also a little shorter than the visible part of the first, the proportion is, however, somewhat variable. So, e. g., in the male from Stat. 299 the second article is one- fourth shorter than the visible part of the first, in the adult male from Stat. 99 one-sixth and in an ova-bearing female from Stat. 258 one-seventh. In all the specimens the third article is distinctly shorter than the second. The stout stylocerite, the outer margin of which is setose, reaches almost to the middle of the second article, as e. g. in an adult, ova-bearing female from Stat. 164; sometimes it extends just to the middle, as in the male from Stat. 299, or even slightly beyond the middle, as in the adult male from Stat. 99. In the two cotypes from the Mergui-Archipelago the stylocerite extends also to just beyond the middle of the second article. The lower spine of the basicerite is turned outward at the tip and shorter than the stylocerite, but it reaches more or less beyond the apex of first antennular article; the length of the upper spine is one-third that of the lower. Carpocerite much longer than antennular peduncle, projecting with the whole length of third article beyond the tip of this peduncle; terminal spine of scaphocerite as long as the antennular peduncle, rounded tip of the blade extending to the distal third, or sometimes to the middle, of third article. 81 SIBOGA-EXPEDITIE XXXIX a '. 2S 214 As in Syn. Gravieri the rostrum and the orbital spines are setose at their tips ; the rostrum which is slightly upturned at the extremity and slightly longer than the orbital spines, reaches to the distal third or fourth of the visible part of first antennular article, sometimes, as in an adult female from Stat. 164, hardly beyond the middle. The orbital spines that are subacute - - in an adult, ova-bearing female from Stat. 164 even rather obtuse — are much broader than the rostrum, slightly convex above and their tips are a little curved inward, just as in the Mergui cotypes. Telson rather elongate, proportion between its length and the width of the posterior margin varying from 3 to 3,43, greatest width anteriorly twice as large as the width of the posterior margin. The spinules of the upper surface are situated more backward and the two pairs are situated nearer to one another than those of Syn. Gravieri, as is proved by comparing the Table of measurements of both species. The large chela accords with my figure 61 a (1. c. 1897). In my Report of 1888 nothing is said concerning the small chela, while in my paper of 1897 it is described as presenting nearly the same form as in Syn. neptunus (Dana) (Dana, PI. 35, iïg. 5^). In the two cotypes from Mergui this is indeed the case: in Dana's figure the proportion between the length of the chela and the height of the palm appears to be 3,3, in the two Mergui specimens 3,4 and 3,35 and in either of them the fingers are slightly shorter than the palm. Novv it is a remarkable fact that in the specimens collected by the "Siboga" the smaller chela shows a somewhat more slender shape, the proportion between the total length and the height of the palm varying between 3,8 and 4,33; the fingers are, in adult specimens, a little shorter, as long or slightly longer than the palm. The palm therefore usually appears a little more slender than in the cotypes from the Mergui- Archipelago, but in the adult male from Stat. 99 its shape is the same, the proportion between the length of the palm and its height being 1,8, in the Mergui specimens 1,77 and 1,7: it is therefore obvious that the stouter form of this chela in the specimens from the Mergui-Archipelago is only an individual feature — and that the specimens taken by the "Siboga" indeed belong to Syn. neomcris. The 2nd legs resemble those of Syn. Gravieri. The first carpal segment is slender, 6- times as long as thick, and longer than the following segments taken together : in very young specimens, as in N° 6 of the Table of measurements, the first segment is stouter and slightly shorter than the following taken together. The number of spinules with which the meri of the third legs are armed, 3 in very young specimens, amounts to 4, 5, 6, even to 8 in larger and adult individuals ; the meri of the fourth legs bear 2, 3 or 4 spinules, in young specimens only one. The dorsal hook of the dactylus of the third legs measures one-third the length of the principal one, its thickness is usually a little less than one-third, sometimes almost one-fourth that of the other; the dactyli of the fourth legs resemble those of the third. As regards these legs I refer to the Tables B and C of measurements. Table A. Proportion between length of telson and width of posterior margin Proportion between the greatest width and that of posterior margin N» 1. N" 2. 9 X" 3- N" 4. O* X» 5. X° 6. 9 N° 7. 9 N» 8. juv. 1 3 3-25 3»i 3,-4 3,2 3,43 3-375 3<3 i.93 1,925 2,1 2,1 2,1 2 2 2,175 2,1 1 U V . 3>o: 212 82 215 Proportion between the length of the telson and the distance of the anterior pair of spinules from the postérior margin Proportion between the distances of the two pairs of spinules from the postérior margin N" i. N» 2. N° 3. N° 4. N° 5. N° 6. N° 7. N° 8. N° 9. cf 9 cf cf cf 9 9 jw- juv. 2,5 i.57 2,4 2,8 2,38 2-7 2,6 3>i 2,7 2,6 i.S '.57 1.55 i,Si i-47 1,52 1,56 i,54 Table B. Length of small chela Height of small chela Proportion between length and height of the chela . Length of the fingers Proportion between the length of the chela and that of the fingers Proportion between length and height of the palm . NO 1. No 2. NO 3. N» 4. N« 5. N° 6. No 7. N» 8. N» 9. juv. 1,85 0,46 4 0,85 2,17 2,2 cf 9 cf cf cf 9 9 juv. 4,7 3-85 7.8 5-2 5,24 6,8 4,94 3-86 1,38 1,15 2,06 1,26 1,26 i-7 1,14 0,96 3.4 3-35 3>8 4,12 4,16 4 4-33 4 2,26 i.9 4.i 2,6 2,62 3-4 2,54 1,96 2,08 2,03 i-9 2 2 2 L94 1.97 i,77 i-7 i,S 2,07 2,08 2 2,1 1,98 Table C , indicating the proportions between the length of the meri, carpi and propodi of the third and fourth legs. N» 1. No 2. No 3. NO 4. NO 5. No 6. N" 7. N» S. N« 9. 9 cf cf cf 9 9 j"v. juv. Merus i ( 2,64 2,45 2,72 2,62 2,33 2,7 2,68 2,68 2,44 Carpus > of third legs (Iiiiiiiii Propodus ) ( 2,18 2,1 2 2,08 1,88 2,1 2,1 2,21 2,35 Merus j ( 2,52 2,31 2,56 2,55 2,5 2,75 2,47 2,5 2,31 Carpus I of fourth legs jliil.lliii Propodus ) ( 2,25 2,1 2,04 2,2 2,26 2,26 2,27 2,36 2,41 Table D. Length of merus YVidth of merus Proportion between length and width of merus Length of carpus from articulation to articulation Width of carpus Proportion between length and width of carpus Length of propodus Width of propodus Proportion between length and width of propodus Length of dactylus Length of dorsal hook with regard to the prin- cipal one Thickness of dorsal hook with regard to the principal one CfQ NO 1. NO 2. No 3. NO 4. N« 5. No 6. NO 7. No 8. NO 9. cf O cf cf cf 9 9 juv. juv. 2,9 2-7 4,46 3-15 3,i 4 3 2,3 1,1 0,98 0,9 1,28 0-97 o,95 1,26 0,89 0,72 0,36 3 3,48 3-25 3,26 3,17 3-37 3,2 3 1,1 1,1 1,64 1,2 i,3 i,45 1,12 0,86 0,45 0,58 o,55 0,88 0,65 0,66 0,84 0,62 0,48 0,26 1,9 2 1,86 1,84 i-97 l>73 1,8 1,8 1,7 2,4 2,3 3-3 2,5 2,44 3,05 2,4 1,9 1,06 o,5 0,48 0,71 0,55 0,52 0,71 0,51 0,42 0,24 4,8 4,8 4-65 4,54 4,7 4-3 4,7 4,5 4,42 0,72 o,68 1,04 0.72 0,82 0,8 0,6 0,32 o,33 o,33 0,36 0,43 0,31 0,28 0,3 0,27 o,3 0,4 83 2 IÓ CfQ Table E. Length of merus. . . , Width of merus Proportion between length and width of merus Length of carpus from articulation to articulation Width of carpus Proportion between length and width of carpus Length of propodus Width of propodus Proportion between length and width of propodus Length of dactylus Length of dorsal hook with regard to the prin- cipal one Thickness of dorsal hook with regard to the principal one N° i and N" 2, Cotypes of Syn. neomeris (de Man) from the X" 3, adult male, long 26,5 mm. and N° 6, ova-bearing female, long 26 N° 4, 5, 7, 8 and 9 from Stat. 258. N» 1. N« 2. No 3. N» 4. NO 5. NO 6. N» 7. NO 8. N° 9. 0" 9 c? O* C? 9 9 juv. juv. 2,4 2,2 3,64 2,55 2,5 3<3 2,4 1,8 0,9 0,77 0,715 0,98 0,8 0,82 1,05 o.73 0,59 0,3 3.1 3,1 3-7 3,i9 3 3- 14 3,3 3 3 0,95 0,95 1,42 1,06 i 1,2 o,97 0,72 0,39 0,53 0,5 0,72 0,61 0,63 0,78 o,57 o,45 0,24 1,8 1,9 2 1,64 1,6 i,54 i.7 1,6 1,6 2,14 2 2,9 2 2 2,26 2,72 2,2 1.7 o,94 0,41 0,4 0,64 0,48 o,5 0,64 0,48 o,37 0,225 5 5 4,53 4,58 4,52 4,25 4,58 4,6 4,2 0,64 0,66 0,96 0,8 0,9 0,3 o,33 0,38 0,43 o,3 0,28 0,26 0,3 0,33 The eggs are rather numerous, large, 1 — 1,2 mm. long, 0,72 — 0,7; of the Mergui female N° 2 are long 0,8 mm. and 0,55 mm. thick. Mergui-Archipelago ; mm. from Stat. 99; mm. broad ; those f 6. Synalpheus Gravieri Cont. Synalpheus Gravieri H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 870, fig. 2. Synalpheus Gravieri J. Pearson, On the Macrura, in: Herdman's Report on the Pearl Oyster Fisheries, 1905, p. 82. Alpheus prolificus A. Ortmann, in: Zoolog. Jahrb. V. Abth. f. Syst. 1890, p. 484. Stat. 49'. April 14. 8°23'.5S., ii9°4'.6E. Sapeh-Strait. 70 m. Coral and shells. 6 specimens of different size, one of which with eggs. Stat. 51. April 19. Madura-bay and other localities in the southern part of Molo-Strait. Depth from 69 — 91 m. Fine grey sand. 3 specimens, one of which with eggs. Stat. 164. August 20. i°42'.5 S., I30°47'.5 E. Between Misool and New Guinea. 32 m. Sand, small stones and shells. 1 specimen. Stat. 240. November 22 — December 1. Banda-anchorage. Lithothamnion-bank in 18 — 36 m. 2 young specimens. Stat. 258. December 12/16. Tual-anchorage, Kei-islands. 22 m. Lithothamnion. 19 specimens of different size, many of which with eggs. Stat. 260. December 16 and 18. 5°3Ó'.5S., I32°55'.2E. 2,3 miles N., 630 W. from the North point of Nuhu Jaan, Kei-islands. 90 m. Sand, coral and shells. 2 egg-bearing females of small size. St.it. 279. January 1 1 1 3 . Rumah-Kuda-bay, Roma-island. 36111. Mud and sand. 1 egg-bearing female. Stat. 310. February 12. 8°3o'S., II9°7'.5 E. 73 m. Sand with few pieces of dead coral. 1 adult egg-bearing female and 1 young specimen. Stat. 315. February 17/18. Anchorage East of Sailus Besar, Paternoster-islands. Depth up to 36 m. Lithothamnion. I female with eggs. The numerous specimens, collected by this expedition, are very well in accordance with 84 2 I 7 Coutière's description and figures. As wel! the rostrum as the two orbital spines bear a few fine setae at their tips; the outer margin of the orbital spines appears usually not concave mar the tips that usually are turnecl inwarcl; whereas the rostral point is generally slightly turned upward, the orbital spines project horizontally forward. The measurements of the telson are for 6 specimens indicated in Table A, they are somewhat variable: in the young specimen N° 5 the two pairs of spinules of the upper surface are situated closer together, in the female N° 6 from Stat. 260, that has a small size, they are farther distant from one another than in the other specimens. As results from Table B, the proportion between the length of the meri, carpi and própodi of the 3ld and 4,h legs appears also liable to variability. The four specimens N° 2 — 5 from Stat. 258 accord, with regard to these proportions, pretty well with those mentioned by Coutière, though it ought to be remarked, that, after this author, the meri and propodi of the 4th legs should be of equal length, while in our specimens the propodi are usually a little short er, sometimes, however, as in N° 3 and in a small, ova-bearing female from Stat. 260, N° 6 of the Table, longer than the meri; different from the other specimens, the propodus of the 3"1 pair appears in this female N° 6 hardly shorter than the merus. As regards the proportion between the length and the width of these joints, I wish to remark that in fig. 2 6 of Coutière's work the propodus appears 7-times as long as broad, while, according to the measurements indicated on Table C, the propodus of the 3rd legs shows in the „Siboga" specimens a somewhat stouter shape, the proportion varying between 5,1 and 5,88, except in the small female from Stat. 260, in which the proportion is indicated by the number 6,6; according to the enlargements of the figures in Coutière's paper, his specimens of Syn. Gravieri seem to have been of a very small size, and the more slender shape of the propodus may probably be explained by that difference of size. The merus of 3"1 legs is sometimes furnished with 5 spinules, in the two adult females N° 2 and X" 3 from Stat. 258 with 3, in younger specimens with 2 and in the male X" 4 from this Station there were no spinules at all. The meri of the 4,h legs carry one or two spinules. Accordine to Coutière the thickness of the dorsal hook of the dactvli should be onlv one- sixth that of the principal hook ; though in our specimens the length of the dorsal hook measures also usually one-third that of the other, the dorsal hook appears co mparati vely thicker, for its thickness is usually one-third, rarely one-fourth that of the ventral hook. This difference, however, is perhaps also owing to the larger size of the specimens collected by this expedition. In the original description the proportion between the length and the height of the small chela is said to be 3,75. In the female X° 2 from Stat. 258 this proportion proved to be 3,72, but in the female X" 3 from the same Station 3,44: in both specimens the fingers appear as much shorter than the palm as in Fig. 2 a of Coutière's paper. First carpal segment of 2nd legs slender, 6 — 6,6-times as long as thick at its distal extremity and somewhat longer than the following segments taken together: in the youngest specimens the first segment shows a somewhat less slender form and it appears here not longer than the sum of the following. In some ova-bearing specimens, as e. g. in X° 3 from Stat. 258 and in the female from Stat. 315 the eggs are of a yellow colour, rather numerous, 0,72 — 0,76111111. long and black 85 2l8 eye-spots are not visible. Now it is a remarkable fact that in other specimens, as in the adult female N° 2 from Stat. 258 and in that from Stat. 310, the eggs are much larger, 1 — 1,1 mm. lono- and 0,6 — 0,7 mm. thick, less numerous and large, black eye-spots are well-developed. These females Nu 2 and N° 3 from Stat. 258 are, however, adult, of equal size and fully agree with one another. In the female N° 6 from Stat. 260 the ova are few in number, also large, 1 mm. long and provided with black eye-spots, though this specimen is only 10 mm. long. These observations indicate that the eggs are developed at various ages of the individual. The largest specimens are 16 mm. long. Table A. Proportion between length of telson and width of the posterior margin Proportion between the greatest width and that of the posterior margin Proportion between length of telson and the distance of the anterior pair of spinules from the posterior margin .... Proportion between the distances of the two pairs of spinules from the posterior margin N" 1. N° 2. N° 3. N» 4. N« 5. N» 6. N» 7. 2,73 1,97 2,3 1,75 3.17 3>2I 3 3,16 3,26 3>3 2,17 2,3 2,1 2,26 2,17 2,1 2,16 2,2 2,l6 2,13 2,34 i,93 1,76 1,64 1,66 i,7 i,45 1,84 Table B, indicating the proportion between the length of the meri, carpi and propodi of the third and fourth legs. N" 1. Merus j ( 2,64 Carpus > of the third legs ( 1 Propodus ) '2,3 Merus J ( 2,43 Carpus J of the fourth legs \ 1 Propodus ) ' 2,37 N» 2. according to N° 4. N° 5. N° 6. Coutière. 2,8l I 2,43 2,41 1 2,41 2,87 2,82 3 2,81 2,61 I I 1 1 1 2,37 2,43 2,39 2,38 2,58 2,46 2,43 2,63 2,65 2,31 I 1 1 1 1 2,37 2,48 2,57 2,54 2,61 Table C. Length of merus Width of merus Proportion Length of carpus ') Width of carpus Proportion Length of propodus Width of propodus Proportion Length of dactylus , Length of the dorsal hook with regard to the ventral Thickness of the dorsal hook with regard to the ventral N° 1. N° 2. N» 3. No 4. NO 5. 2.3 2o 2 2 2,6 1,8 0,6 0,64 0,7 0,68 0,48 3-33 3,6 3> '4 3,82 375 0 0,87 0,8 0,78 0,88 0,64 Er o,39 0,42 0,46 0,45 o,33 rt 2,23 i,9 i.7 2 i,94 S. o,34 i,9 0,36 i>9 o,37 2,1 0,4 i,52 0,27 crq e/; 5,88 5,3 5,i 5,25 5,63 o,54 0,6 0,62 0,6 0,42 o,33 0,31 o,33 0,33 0,4 0,33 0,26 0,3 0,3 o,33 NO 6. 1,54 0,387 4 o,59 0,26 2,3 1,52 0,23 6,6 0,36 o,33 1) Measured from articulation to articulation. 86 2 19 Length of merus Width of merus Proportion Length of carpus Width of carpus Proportion Length of propodus Width of propodus. : Proportion Length of dactylus Length of the dorsal hook with regard to the ventral Thickness of the dorsal hook with regard to the ventral NO i. N» 2. No 3. NO 4. N" 5. [ I,85 1,72 '>7 2 I,38 0,485 0,52 o,54 0,58 0,39 3.8i 3o 3.i5 3,45 3-54 o 0,76 0,7 o,7 0,76 0,52 o o,345 0,39 0,4 0,4 0,29 o1 2 2 1,8 i,75 i.9 i,8 r+ 1,8 1,66 i,74 i,95 1,32 ^ 0,3 o.33 0,36 0,38 0,25 O 'Jï 6 5 4.83 5,i 5,3 0,52 0,6 0,62 0,42 o,33 o,33 0,38 o,33 o,3 0,28 o,33 o,3 N» 6. 1,2 0,315 3,8 0,52 0,23 2,26 1,36 0,2 6,8 0,38 o,37 o,33 N° 2 and Nn 3, females with eggs, 16 mm. Nu 1 male, long 13,5 mm. from Stat. 49a long, from Stat. 258; N° 4 male, long 15,5 mm., and N° 5 young specimen, both from Stat. 258; N° 6 female with large eggs, 10 mm. long, from Stat. 260; N° 7 male from Stat. 258. Remarks. The examination of two specimens from Kagoshima, Japan, referred by Dr. Ortmann (1. c.) to Syn. prolificus (Sp. Bate), proved them to belong to Syn. Gravieri. The proportion between the greatest width of the telson and that of its posterior margin was hardly 2, just as in the male N° 7 from Stat. 258: both in this male and in Ortmann's specimens the telson appeared a little narrower than in the other specimens collected by the "Siboga". General distribution: Djibouti (Coutière); Maldive Archipelago (Coutière); China Sea (Coutière); Tokyo Bay and Kagoshima, Japan (Ortmann). f 7. Synalphais Iphinoè de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 116. Stat. 49'. April 14. 8°23'.5S., U9°4'.6E. Sapeh-Strait. 70 m. Coral and shells. 1 male. Stat. 51. April 19. Madura-bay and other localities in the southern part of Molo-Strait. From 54 — 90 m. Fine grey sand. 2 males and 1 ova-bearing female. Stat. 240. November 22 till December 1. Banda-anchorage. Lithothamnion-bank in 18 — 36 m. 1 male. Stat. 279. January n/13. Rumah-Kuda-bay, Roma-island. 36 m. Mud and sand. 1 male. A new species of small size, belonging to the Neomeris group. The rostrum in the male from Banda, which is regarded as the type, is narrow and reaches to the distal third of the visible part of first antennular article. The conical and acuminate, orbital spines are hardly shorter than the rostrum and diverge slightly outward: the three spines are distinctly curve d upward at their tips and are not setiferous. In the male from Ruma-Kuda-bay the three spines reach a little farther forward and the supraorbital spines do not diverge outward, in the male from Stat. 49=* they slightly diverge, but are somewhat shorter with regard to the rostrum than in the type; the males from Madura-bay resemble that from Sapeh-Strait, but the rostrum reaches the end of first antennular article, the ova-bearing female, finally, agrees with the type, but the supraorbital spines are less broad and anteriorly much 37 220 narrower, the three spines are moreover more strongly curved upwar'd. These slight differences are, in my opinion, to be regarded as individual. Measured at the upper side, — not along the margins - - the visible part of hrst antennular article appears t \v i c e or alm os t twice as long as the second, which is a little longer than the third and the stylocerite just reaches beyond the first article; in this species the visible part of first article is longer with regard to the second than in Syn. Gravieri. The two spines of the basicerite are turned outward and the upper appears in a lateral view almost half as long as the lower; carpocerite little longer than the antennular peduncle, reaching with scarcely half the length of the third article beyond it. The blade of the scaphocerite just exceeds the second antennular article and the terminal spine that projects by one-third of its length beyond the blade, slight ly surpasses the antennular peduncle and is almost as 1 o n g as the carpocerite ; in the ova-bearing, adult female from Stat. 51 it is even just as long, but in this female the blade reaches almost the end of the antennular peduncle. The external maxillipeds exceed the carpocerite by one-third or two-fifths of their terminal joint. Telson short er with regard to the width of the posterior margin than that of Syn. Gravieri, the telson being 2,7 — 2,75-times as long as that margin is broad, in the specimen from Stat. 279 this number is even 2,44; outer angles of the posterior margin acute, though not prominent, the margin itself prominent in the middle as in Syn. Gravieri. Spinules of the upper surface o, 1 4 — o, 1 6 mm . long, a n t e r i o r pair s i t u a t e d just in front of the middle, posterior pair one and a half, in the male from Sapeh-Strait even more than twice as far distant from the posterior margin as from the anterior pair. Upper margin of brachium of large cheliped with a small, curved spine at the apex, chela, as in Syn. Gravieri, with a spinous process at the distal end of the palm, but the fingers are a little longer. Small chela also as in Syn. Gravieri, the measurements and proportions are indicated in the Table. Carpus of second legs as in this species, hrst segment si en der, 6-times as long as thick distallv and distinctly longer than the followincr seoments taken together. As regards the legs of the third and fourth pair, I refer to the Table, but I wish to remark the following. In both legs the merus is 4-times as long as broad; along the middle of the merus of the third legs are inserted four or five small spinules, from 0,04 to 0,1411101. long, whereas one observes two or three similar spinules on the merus of the fourth pair. Propodus as in Syn. Gravieri, but, like the merus, usually a little more slender. Dactylus about one-fourth the propodus, broad at its base, its width being here just half as long as the straight distance between the tip of the ventral hook and the proximal end of the anterior margin. Ventral hook perpenclicular to the posterior border, 3-times as long as broad near the insertion of the dorsal hook and slightly tortuous; dorsal hook much s hor ter and narrower than the other, its length one-third that of the ventral hook, which at its base appears somewhat more than 3-times as thick as the dorsal hook. Ova comparatively large, 0,75 mm. long. The male from Banda is 12111111. long, the ova-bearing female from Stat. 51 12,5111111. SS 2 2 1 Table A. Proportion between length of telson and that of the posterior margin . . . Proportion between the greatest width and that of the posterior margin . Proportion between length of telson and the distance of the anterior pair of spinules from the posterior margin Proportion between the distances of the two pairs of spinules from the posterior margin N° i male from Stat. 49a; X" 2 male from Stat. 51 ; N" 3 male from Banda; N° 4 male from Stat. 279. Table B. N» 1. N» 2. NO 3. N" 4. 2,7 2,75 2,75 2,44 2,05 2 2,o6 i>95 1,8 1 1,8 1,86 1,81 1.45 1,65 1,66 1,6 Length of small chela Height of the palm Proportion between length and height Length of the fingers Proportion between length of chela and that of the fingers Proportion between length and height of the palm . N« 1. N» 2. NO 3. 2,24 2,25 2,24 0,66 0,73 0,67 3,4 3,1 3-34 1 0,92 0,94 2,24 2,44 2,4 1,88 1,82 1,94 N° 1 male from Stat. 49a ; N° 2 adult female from Stat. 5 1 ; N° 3 male from Banda. Table C , indicating the proportion between the length of the meri, carpi and propodi of the 3rd and 4,h legs. NO 1. NO 2. NO 3. Merus \ ( 3 Carpus > .of y& legs < 1 Propodus ) ! 2,6 Merus \ j 2,5 Carpus > of 4th legs j I Propodus ) 3 2,86 1 1 2,54 2,46 2,58 2,5 1 I 2,41 2,42 Table D. Length of merus Width of merus Proportion between length and width of merus . Length of carpus from articulation to articulation. . Width of carpus Proportion between length and width of carpus . . . . Length of propodus Width of propodus Proportion between length and width of propodus . Length of dactylus 89 Sir.OGA- EXPEDITIE XXXIX fl '. of the third legs N» 1. No 2. 2 2 0,51 0,5 4 4 0,66 0,67 0,3 0,31 2 2 2,1 1,72 ï.7 0,25 0,268 7 6,3 0,4 0,44 NO 3. 2,12 0,525 4 0,74 o,33 2,24 1,82 0,29 6,3 0,46 29 of the fourth legs Length of merus Width of merus Proportion between length and width of merus .... Length of carpus from articulation to articulation. Width of carpus Proportion between length and width of carpus .... Length of propodus Width of propodus Proportion between length and width of propodus . Length of dactylus • . . . Table C and Table D : N° i male from Stat. 49* ; N° 2 male from Stat. 5 1 ; N° from Banda. N» 1. N» 2. 1,6 i.55 0,39 0,4 4,i 3.375 0,64 0,6 0,28 0,285 2,3 2,1 1,48 i,45 0,23 0,25 6,4 5-8 0,4 0,42 1,65 0,41 4 0,66 0,29 2,28 1,6 0,26 6,i 0,46 male f 8. Synalpheus jcdanensis de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 117. Stat. 273. December 2326. Anchorage off Pulu Jedan, East coast of Aru-islands (Pearl-banks). 13 m. Sand and shells. 3 males and 3 ova-bearing females. A nother new form of the Neomeris group, approaching to Syn. Gravieri and Syn. Iphinoc, but distinguished by the stouter shape of the small chela and of the four posterior legs. In one of the male specimens the rostrum is narrow, 3-times as long as wide at its base and reaching to the distal fourth of the visible part of first antennular article; it appears distinctly longer than the supraorbital spines which are also narrow, though at their base broader than the rostrum. The tips of the three frontal spines are setose, slightly curved upward and project almost straight forward. In another male and in an adult female the rostrum reaches almost to the end of first article, in another female, on the contrary, it extends to the distal third only, while in the second male the supraorbital spines are very slightly converging. The visible part of first antennular article is usually a little more than one and a half as long as the second, in the ova-bearing female it is almost twice as long, the proportion being as 9:5; third article as long or hardly shorter than second. The stylocerite reaches to the 2nd third or fourth part of second antennular article. Lower spine of basicerite curved outward, slightly shorter than the stylocerite; upper spine turned upward, hardly half as long as the lower. Carpocerite very little longer than the antennular peduncle, reaching only by one-thircl or one-fourth the third article beyond it ; blade extending to the middle of third article, terminal spine of the scaphocerite as long as the antennular peduncle, in one female even as long as the carpocerite. The telson resembles that of Syn. Iphinoc, the outer angles of the posterior margin which is rather prominent in the middle, are spiniform though measuring hardly one-third the length of the adjacent, short, external spinules. Spinules of the upper surface large, o, 15 — 0,1911101. long, anterior pair situated just in front of the middle, but the distance between the two pairs with regard to their distance from the posterior margin appears rather variable (vide the measurements). 90 2 2 ' External maxillipeds extending by two-fifths of their terminal joint beyond the carpocerite. The large chela resembles that of Syn. iphino'è, distal extremity of the palm with a spine which is curved downward, upper margin of brachium ending in a small acute tooth. The small chela agrees also with that of Syn. Iphinoë, as regards the length of the fingers but, the height being much larger, the chela presents a much stouter shape. While in Syn. Iphino'è the chela is more than 3-times and the palm almost twice as long as high, in Syn. jedanensis the palm is only one and a half, the chela 2,61 — 2,73-times as long as high. First carpal segment of 2lld legs ofa stouter form than in Syn. Iphino'è, the proportion between length and thickness varying from 3,8 to 4,8; following segments taken together slightly longer or but a trifle shorter than the first segment. As regards the proportion between the length of the merus, the carpus and the propodus of 3ld and 4th legs, this species accords with Syn. Iphino'è, but all these joints show a stouter shape, as is proved by the measurements. The merus of 3lJ legs is armed with five spinules which are 0,06 — 0,16 mm. long, that of 4th legs with three or four. Dactyli nearly as in Syn. IpJiinoc, but those of the yd pair a little less broad or thick at base: so, in the 3ld legs, the proportion between the length of the dactylus, i. e. the straight distance between its tip and the proximal end of its anterior margin, and the width near the articulation varies from 2,45 to 2,5, whereas it is 2,1 — 2,21 in Syn. Iphiiio'è. These dactyli measure about one-fourth the length of the propodus, the dorsal hook is almost half as long as the other, which is 3-times, in one female even twice as thick as the dorsal hook. The dactyli of 4th legs measure one-third the length of the propodus or somewhat less and their thickness near the articulation is about s/7 their length ; the dorsal hook is almost half as long as the ventral which is a little more than twice to three times as thick as the dorsal hook. Eggs large, not numerous; those of a female long 15 mm., are 1,1 — 1,2 mm. long, ochraceous, without eye-spots, those of another female of the same size are 1,5 mm. long, greyish and black eye-spots are already observed. Table A. Proportion between length of telson and that of the posterior margin . Proportion between the greatest width and that of the posterior margin . . Proportion between the length of the telson and the distance of the anterior pair of spinules from the posterior margin Proportion between the distances of the two pairs of spinules from the posterior margin Table B. Length of the small chela Height of the palm Proportion length and height of this chela Length of the fingers Proportion between the length of the chela and that of the fingers. Proportion between length and height of the palm 91 N" 1. N» 2. NO 3. 2,54 2,57 2,55 2 2 i,94 I,34 1,73 1,91 1,91 i,53 i,7i N" 1. N° 2. No 3. 2,25 2,25 2,65 0,83 0,86 0,97 2,71 2,6l 2,73 I 0,9 I,l6 2,25 2,5 2,28 i>5 1,57 i,54 224 Table C, indicating the proportion between the length of the meri, carpi and propodi of the 3rd and 4th legs. N» i. Merus J j 2,93 Carpus > of 31'd legs < 1 Propodus ] I 2,28 Merus ) j 2,6 Carpus J of 4A legs < 1 Propodus ) '2,18 Table D. N» 2. N» 3 2,84 3 I 1 2,45 2,4 2.57 2,44 1 1 2,28 2,1 Length of the merus Width of the merus Proportion between length and width of the merus . Length of the carpus from articulation to articulation Width of the carpus Proportion between length and width of the carpus . Length of the propodus Width of the propodus Proportion between length and width of the propodus Length of the dactylus Length of the merus Width of the merus Proportion between length and width of the merus . Length of the carpus from articulation to articulation . Width of the carpus Proportion between length and width of the carpus . Length of the propodus Width of the propodus Proportion between the length and width of the propodus Length of the dactylus . . • of the third lees of the fourth lesjs No 1. No 2. No 3. 2,05 2,l6 2,3 0.555 0,63 0,65 3>7 3,43 3,54 0,7 0,76 0,78 0,33 0,42 0,39 2,1 i,8 2 1,6 1,86 1,86 0.3 o,37 0,335 r' -in 30J 5 5,55 0,43 0,6 0,48 f l'6 i,8 1,76 0,44 o,53 0,48 3,64 3,4 3,66 0,62 o,7 0,72 0,29 o,35 0,33 2,1 2 2 2 1-35 1,6 1,52 0,255 o,335 0,29 5,3 4,8 5,24 0,46 o,5 0,44 N° 1 a m ale, N° 2 and N° 3 females. f9. Synalpheus miscellaneus de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 118. Stat. 282. January 15/17. 8°25'.2S., i2/°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 male. A new species of the Neomeris group presenting characters both of Syn. neomeris and of Syn. jedanensis and therefore bearing the name of "miscellaneus". Frontal spines with the subacute tips setose and very slightly turned upward. The rostrum which is 2,5-times as long as broad at its base, reaches a little beyond the middle of the visible part of first antennular article, lateral spines slightly shorter than the rostrum, with the tips somewhat turned inward; 92 the interspaces betvveen the rostrum and the supraorbital spines show nearly the reverse shape of these spines, which are harclly longer than broad at their base, convex above, and resembling those of Syn. neomeris. Second article of the rather slender, antennular peduncle one and a half as long as broad at the distal end, measuring two-thirds the length of the visible part of the first article, third article a little shorter than second ; stylocerite as long as basal article, not reaching beyond it. Lower spine of basicerite a little shorter than the stylocerite, with the tip slightly turned outward ; upper spine half as long as the lower, directed obliquely upward ; the carpocerite, that is 3,7-times as long as thick, surpasses the antennular peduncle by one-third of the third article. The lateral spine of the scaphocerite, the outer margin of which is straight, is a little shorter than the antennular peduncle; this spine is not curved inward and surpasses the rather narrow blade by one-fifth of its length and the blade reaches the middle of third antennular article. In Syn. neomeris the carpocerite is longer, the stylocerite reaches to the middle of second antennular article, the lower spine of the basicerite is but a little shorter than the stylocerite and the upper spine measures only one-third of the lower. Telson much shorter with regard to its width than that of Syn. neomeris, the pro- portion between its length and the width of the posterior margin being 2,35 ; posterior margin moderately prominent, the outer angles spiniform, though short, reaching only the middle of the short spinules near them ; proportion between the greatest width and that of the posterior margin 1,77. The spinules of the upper surface which are 0,17 mm. long and situated not far from the lateral margins, are inserted far back w ar d and the two pairs are as much approximate as in Syn. neomeris. The proportion between the distance of the anterior pair from the posterior margin and the length of the telson is namely 3 and the proportion between the distances of both pairs from the posterior margin is 1,47. (Confer in the Table A of Syn. neomeris N° 5 and N° 6, p. 215). Brachium of large cheliped 2,3-times as long as broad, presenting a less stout shape than in Syn. neomeris, upper margin obtuse at apex; lower angle of the carpus produced into a long, spiniform tooth, chela nearly as in Syn. neomeris, anterior margin of the palm with a short, acute tooth which is curved downward. Brachium of small cheliped resembling that of the large. The small chela resembles that of Syn. jcdanensis : proportion between its length and height 2,7, proportion between the total length of the chela and that of the fingers 2,336 and proportion between the length and the height of the palm 1,54. The small chela of Syn. neomeris has a more slender form and the fingers are longer. Second legs as in Syn. neomeris. Merus slender, 7,1-times as long as thick, first segment of the carpus 6-times as long as thick, slightly longer than the sum of the following. The proportions of the third pair of feet are: merus 2,72; carpus i; propodus 2,1. The merus, 3,78-times as long as wide, is armed, near the distal third of the posterior margin, with one single small spinule, 0,14 mm. long, of a rather stout form; carpus 1,96-times, propodus just 5-times as long as wide. While in Syn. jcdanensis the propodus of the third legs carries eight spinules, one observes only f o u r spinules, long 0,16 — 0,2 mm. in this new species, 93 22Ó besides those at the distal extremity. The dactyli very much resemble those of Syn. neómeris\ they measure a little less than one-third the length of the propodus, viz. 4/is ar>d they are just 2,5-times as long as broad near the articulation ; the acuminate ventral hook, which measures almost half the length of the joint and which is 3-times as long as broad at its base, is obliquely directed forward like in Syn. neomeris\ the length of the dorsal hook is one-third that of the other, which is 3-times as thick at its base as the former. The proportions of the fourth pair are: merus 2,32; carpus i; propodus 2,1. Merus 3,27-times longer than wide, with one spinule, long 0,1 mm., of a stout shape just beyond the middle; carpus twice, propodus 5-times as long as broad, the propodus also with four spinules long 0,11 — o, 16 mm., besides those at the distal extremity. Dactylus just one-third the length of the propodus, 2,4-times as long as wide near the articulation, for the rest fully resembling that of the third pair. The third and the fourth legs are moderately setose. Length of the single specimen 16,5 mm. f 10. Syualpheus streptodactylus Cout. Synalpheus neomeris var. streptodactylus H. Coutière, Alpheidae Mald. and Laccad. Arcliip. 1905, p. 870, PI. LXX, fig. 1'. Alpkeus neomeris J. G. de Man, in: Zoolog. Jahrb. Abth. f. Syst. IX, 1S97, p. 734 (partim). Alpheus neomeris J. G. de Man, in: Abhandl. Senckenb. Naturf. Gesells. XXV, 1902, p. 891. Stat. 33. March 24/26. Bay of Pidjot, Lombok. 22 m. and less. Mud, coral and coralsand. 1 ova-bearing female. Stat. 43. April 4/5. Anchorage off Pulu Sarassa, Postillon-islands. Depth up to 36 m. Coral. 1 ova-bearing female. Stat. 50. April 16/18. Bay of Badjo, West coast of Flores. Depth up to 40 ra. Mud, sand and shells, according to locality. 1 very young specimen. Stat. 65'. May 6. Near Tanah Djampeah. From 400 m. upward to 120 m. Pale, grey mud, changing during haul into coral bottom. 1 specimen. Stat. 71. May. Pulu Barang near Makassar. Reef. 1 ova-bearing female. Stat. 86. June 18/19. Anchorage off Dongala, Palos-bay, Celebes. 36 m. Coraheef. 1 ova- bearing female. Stat. 144. August 7/9. Anchorage north of Salomakiëe-(Damar-) island. Reef. 1 ova-bearing female. Stat. 164. August. 20. i°42'-5 S., I30°47'.5 E. Between Misool and New-Guinea. 32 m. Sand, small stones and shells. 1 ova-bearing female. Stat. 213. September 26 — October 26. Saleyer-anchorage and Surroundings. Coralreefs. From 9 — 36 m. Mud and mud with sand. 1 young specimen. Stat. 240. November 22 till December 1. Banda-anchorage. From 9 — 36 ra. Lithothamnion- bank. 1 ova-bearing female. Stat. 258. December 12/16. Tual-anchorage, Kei-islands. 22 m. Lithothamnion, sand and coral. 4 specimens of small size, the largest of which with eggs. Stat. 273. December 23/26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 18 specimens, several of which with eggs. Stat. 282. January 15/17. 8°25'.2S., I27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 ova-bearing female. Stat. 310. February 12. 8°3o'S., ii9°7'.5E. Between Sumbawa and Flores. 73 m. Sand with few pieces of dead coral. 2 ova-bearing females, one of which bears a Bopyrid in the cephalothorax, and 1 young specimen. Stat. 315. February 17/18. Anchorage East of Sailus Besar, Paternoster-islands. Depth up to 36 m. Coral and Lithothamnion. 3 young specimens. 94 2 2 7 In my work on the Decapoda collected by Captain Storm (1. c. 1897) nme specimens of small size, one of which was provided with eggs, from Atjeh, were wrongly referred by me to Syn. neomeris (de Man). At that time I still supposed that the quite different shape of the dactyli of the 3rd and 4th legs was due to their younger age : this mistake should not have been committed, when Professor Coutière's researches had then already been published. (Confer p. 213). Syn. neomeris (de Man) is in reality a quite different species, its telson is much more elongate and the anterior pair of spinules are situated always posterior to the middle; the second antennular article is somewhat longer with regard to the visible part of the first, the third and the fourth legs show a much stouter shape, the propodi are always considerably short er than the meri and the shape of the dactyli is quite different; the small chela has a more slender form, the fingers are longer and this species attains a much larger size than Syn. streptodactylus. Through the courtesy of Prolessor Coutière I was able to study four specimens, two of which with eggs, from the Maldive Archipelago, which in the quoted paper he has referred to Syn. neomeris: these specimens, however, proved to belong to the variety streptodactylus of this author and not at all to the true Syn. neomeris (de Man). These specimens also agree with one of the nine from Atjeh, which I have referred to Syn. neomeris in 1897: this fact was already suggested by Coutière in his work on the Alpheidae of the Maldive and Laccadive Archipelagoes, 1905, p. 870. The' size of the ova-bearing females is variable. So e. g. the female from Banda is 10 mm. long, its eggs 0,78 mm. long; in the female from Stat. 282, that has the same size, the ova are smaller, ochraceous, 0,6 — 0,62 mm. long, the female from Stat. 310, which is infested by a Bopyrid, is 14,5 mm. long, while the ova on which one observes two black eye-spots, are 1 mm. long; in the largest of all the specimens, the female almost 18 mm. long from Stat. 144, the eggs are rather numerous and 0,78 mm. long, as long as those of the much smaller female from Banda. The numerous specimens collected by the "Siboga" show slight differences with regard to the antennal and antennular peduncles; these ought to be described and I wish to compare them with figure 61 of my quoted paper of 1897: this figure represents a female of Syn. streptodactyhis from Atjeh. The ova-bearing female from Stat. ^^ is 13,5 mm. long; it accords with the cited Fig. 61, but the stylocerite hardly extends beyond the first antennular article and the carpocerite is shorter, though still surpassing the antennular peduncle; terminal spine of scaphocerite as long as the carpocerite. The young specimens trom the three following Stations agree with this female, but in the specimen from Stat. Ó5a the supraorbital spines project straight forward. The female from Stat. 7 1 agrees with the quoted figure, but, the carpocerite being also a little shorter, the terminal spine of the scaphocerite extends much beyond it. This is also the case in the female long 10,5 mm. from Stat. 86, in which the carpocerite is hardly longer than the antennular peduncle ; the stylocerite reacties almost the micldle of the second article and the three frontal spines are a little longer, while the supraorbital spines project straight forward ; the lower spine of the basicerite appears a little shorter than the first antennular article. The 95 228 large female from Stat. 144 accords with the figure, but the carpocerite hardly extends beyond the antennular peduncle and the terminal spine of the scaphocerite extends as far forward as that peduncle ; the frontal spines are a little shorter and directed straight downward. The specimen from Stat. 164 is mutilated, like that from Stat. 213 in which the rostrum and the left supraorbital spine are missing-, the terminal spine of the scaphocerite just reaches beyond the carpocerite, which is hardly longer than the antennular peduncle. The small specimen from Banda accords with the figure, but in that from Stat. 258 the supraorbital spines are hardly shorter than the rostrum and the three frontal spines, slightly longer than in the figure, project straight forward; the carpocerite, as long as the terminal spine of the scaphocerite, appears again a little shorter than in the figure. The specimens taken at the Stat. 273 agree with the figure, but the stylocerite reaches to or just beyond the middle of the second article and both the carpocerite and the terminal spine are a little shorter. Sometimes in these specimens from the Jedan Islands the supraorbital spines project straight forward. The female from Stat. 282 agrees with the figure, but the supraorbital spines are almost as long as the rostrum and the stylocerite reaches to the middle of second article. The two ova-bearing females from Stat. 310 are of medium size, 13 mm. long, the rostrum extends to the end of first antennular article and appears much longer than the supraorbital spines; the stylocerite reaches just beyond the middle of second article and the blade of the scaphocerite to the end of the antennular peduncle. In the young specimens, finally, from Stat. 315 the stylocerite reaches to the middle of second article, while the carpocerite and the terminal spine of the antennal scale are hardly longer than the antennular peduncle. The large chela much resembles that of Syn. neomeris (J. G. de Man, 1. c. 1897, fig. 6irt), but it has a somewhat more slender shape, the small chela, however, differs by the fingers being constantly shorter than the palm : the palm being one and a half as long as the fingers or nearly so. In the first carpal segment of the second legs the proportion between its length and thickness is somewhat variable, this proportion varying between 5 and 5,65; the sum of the following segments is a little shorter than the first. In younger specimens the carpus has a somewhat stouter shape, the proportion between length and thickness of the first segment being then 4,84 (Stat. 258), 4,73 (Stat. 164), 4,6 (Stat. 273), 4,44 (Stat. 240) and even 4,3 (Stat. 213), and in very young individuals as in those from the Stations 240, 213 and 50 the first segment appears a little shorter than the sum of the following. In the youngest of all the specimens, that from Stat. 50, the first carpal segment is only 4-times as long as thick. The large, full-grown, ova-bearing female from Stat. 144 makes a remarkable exception, for the first segment of the carpus has also a stout shape (proportion 4,33) and appears one-fifth shorter than the sum of the followine. As results from the Tables of measurements, the proportions between the length of the joints of the following legs are somewhat variable, like also the proportion between length and width of the joints; the joints appear the more slender, the more younger the specimens are. The meri of the third legs carry 3 — 5 spinules, long 0,08 — 0,13 mm., those of the fourth 2 or 3, rarely 1. Very characteristic are the dactyli. Those of the third pair, that measure 96 two-sevenths or a little more than one-fourth of the propodus, are 3-times as long as broad at their base, — the length of the dactyli being the straight distance between the tip of the ventral hook and the proximal end of their anterior margin — , as well in the specimens from Stat. 273 as in those from Atjeh and from the Maldive Archipelago; sometimes as in the specimen taken at Stat. 33 the proportion between length and width becomes 2,8 and in the adult female from Stat. 144 the dactyli are comparatively broader at their base, the proportion between length and width being here 2,5. According to Coutière (1. c. 1905), in that species which was regarded by him as the true Syn. neomeris, the thickness of the dorsal hook should be no more than one-third that of the ventral and the former should be half as long as the latter; in the variety streptodactylus the dorsal hook should measure at least two-thirds the length of the ventral, which should be only twice as thick as the dorsal hook. All the specimens collected by the "Siboga" now present the characters of this variety streptodactylus, but the ventral hook shows a stouter shape than in Fig. 1' of Coutière's paper: in the "Siboga" specimens the conical ventral hook is namely 2,5-times, in the adult female from Stat. 144 even only twice as long as thick at its base, but in Fig. i' it appears 3,6-times as long as thick. The ventral hook, in the "Siboga" specimens, agrees with Fig. 1, but this figure is probably in- accurate, for the ventral hook appears here only twice as thick at its base as the other, whereas, after the description, it should be 3-times as thick as the dorsal hook. I wish to add that the specimens from the Maldive Archipelago, kindly sent me by Coutière, fully accord with those collected by the "Siboga" as regards the shape of these dactyli, the ventral hook, however, appears comparatively a little less thick, though being not yet 3-times as long as thick. Table A. NO 1. No 2. NO 3. NO 4. N« 5. 2,58 2,7 2,72 2,8l 2,93 i>9 2,o8 2 2,1 2,1 i,97 1,87 1,68 1,8 I,8l i,8 1,64 i-53 1,61 1,74 N" 6. 2,6 Proportion between length of telson and width of posterior margin . Proportion between the greatest width and that of posterior margin . Proportion between length of telson and the distance of the anterior pair of spinules from the posterior margin 1,97 1,07 i,6S 1,8 1,81 1,9 Proportion between the distances of the tw'o pairs of spinules from the posterior margin i,ö 1,04 1,53 1,01 1,74 1,75 N° 1 female with eggs from the Maldive Archipelago ; Nu 2 specimen from Atjeh, described by me in 1897 as Alpheus neomeris. (Private Collection); Nu 3 adult egg-bearing female from Stat. 144; NIJ 4 female with eggs from Stat. 273; N° 5 female with eggs from Stat. 310; N° 6 young specimen from Stat. 315. Table B, indicating the proportion between the length of the meri, carpi and propodi of the third and fourth legs. Merus Carpus Propodus Merus Carpus Propodus of the third legs of the fourth legs N'o 1. 2,73 1 2,69 2,6 I 2,71 N'o 2. N" 3. N» 4. N« 5. N'o 6. N'O 7. N° 8. 2,6l 2,66 2,6 2,7 2,52 2,55 2,6 I 1 I I I I I 2,65 2,3 2,4 2,8 2,55 2,61 2,4 2,54 2,56 2,34 2,33 2,2 2,26 2,35 1 1 1 1 1 I I 2,87 2,33 2,37 2,6 2,47 2,44 2,35 NO 9. 2,7 I 2,6 2,4 I 2,5 97 SIBOGA-EXl'EDITIE XXXIXrt '. Table C. Length of merus Width of merus Proportion between length and width of merus. Length of carpus from articulation to articulation Width of carpus Proportion between length and width of carpus Length of propodus Width of propodus Proportion between length and width of propodus Length of dactylus Breadth of dactylus 0> orq Length of merus Width of merus Proportion between length and width of merus. Length of carpus from articulation to articulation Width of carpus Proportion between length and width of carpus Length of propodus Width of propodus Proportion between length and width of propodus Length of dactylus Breadth of dactylus crq NO i. N« 2. No 3. N» 4. NO 5. NO 6. N» 7. NO 8. 1-75 1,72 2,4 1,85 i,35 1,84 1,76 1,95 0,465 0,455 0,66 0,48 0,325 0,455 0,42 0,52 3,76 3-74 3,64 3,35 4,H 4 4-2 3,75 0,64 0,66 0,9 0,71 o,5 0,73 0,69 0,75 0,29 0,3 0,46 0,325 0,23 0,32 0,3 o,34 2,2 2,2 i,94 2 2 2,2 2,3 2,3 2,2 1,72 1-75 2,06 1.7 1,4 1,86 i,8 1,8 0,25 0,25 o,37 0,28 o,i95 0,275 0,26 0,31 7 7 5,57 6,1 7,2 6,8 7 5,8 0,48 0,51 0,52 0,51 0,41 o,54 o,5 0,46 0,16 0,18 0,213 0,17 0,135 o,i75 0,16 0,18 i.45 i>4 2 i,5 1,12 i,5 i,45 1,6 0,36 o,345 0,545 o,375 0,273 o,37 o,333 0,42 4 4 3,67 4 4,i 4 4,35 3-8 0,56 o,55 0,78 0,64 0,48 0,68 0,64 0,68 0,255 0,26 0,41 0,285 0,23 0,29 0,27 0,31 2 2 2,1 1-9 2,2 2,1 2,34 2,3 2 2 1.52 i,S.8 1,82 '>52 1,25 1,68 1,56 1,6 0,225 0,23 0,33 0,255 0,185 0,25 0,233 0,28 6,75 6,87 5,51 6 6,7 6,72 6,7 5,7 o,47 0,48 0,5 o,47 0,38 o,5 0,46 0,44 0,16 0,17 0,2 0,16 0,12 0,17 0,16 0,17 No 9. 1,64 0,4 4,i 0,6 0,28 2,1 1,56 0,24 6,5 o,45 0,17 i-3 0,32 4 o,54 0,25 2 2 1,36 0,215 6,3 0,41 0,14 In the Tables B and C : N" 1 female with eggs from the Maldive Archipelago ; N° 2 spe- cimen from Atjeh (Private Collection); N° 3 adult female from Stat. 144; N° 4 female from Stat. 164; N° 5 specimen from Stat. 213; N° 6 and N° 7, specimens from Stat. 273; Nu 8 female from Stat. 310; N° 9 young specimen from Stat. 315. Table D. NO 1. No 2. No 3. 2,1 3 2,22 0,7 1,02 0,7 3 3 3,2 0,88 1,2 0,92 2,4 2,5 2,4 i,74 1,8 1,85 No 4. 2,15 0,74 2,9 0,96 Length of the small chela Height of the small chela Proportion between length and height of this chela Length of the fingers Proportion between length of chela and that of the fingers .... Proportion between length and height of the palm 1,74 1,8 1,85 1,61 Nu 1 female with eggs from the Maldive Archipelago; N° 2 adult female from Stat. 144; N° 3 female from Stat. 273; N" 4 ova-bearing female from Stat. 310. General distribution: Maldive Archipelago (Coutière); Atjeh (de Man); Ternate (de Man). f 11. Synalphetis strcptodactyloides de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 114. Stat. 282. January 15/17. 8°25'.2S., I27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 female without eggs. 98 A new form of the Neomeris group, closely related to Syn. streptodactylus Cout. In Syn. neomeris (de Man), Syn. streptodactylus Cout., Syn. Gravieri Cout. and still other species the rostrum is separated posteriorly from the supraorbital spines by the concave, anterior wall of the front, the anterior margin of which is distinctly visible at either side beneath the rostrum, when the carapace is looked at from above. In this new species the rostrum is comparatively broader than in Syn. streptodactylus, being 2,2-times as long as broad at its base, in Syn. streptodactylus 2,75 — 3,25, usually 3-times; it extends to the distal sixth of the visible part of first antennular article and the tip is hardly turned upward; the supraorbital spines, distinctly shorter than the rostrum and hardly reaching beyond the middle of the first article, are slightly directed downward and make acute angles with the rostrum, at least the left spine, for the right is much shorter and apparently mutilated, while the anterior wall of the front is not visible at all; the acute tip of the supraorbital spines is glabrous, like the rostrum, and very slightly turned outward. Second antennular article a little more than two-thirds as long as the first and almost one and a half as long as thick; stylocerite reaching to the 2nd fourth or fifth of median article. The carpocerite extends by two-thirds the length of the third article beyond the tip of the antennular peduncle; terminal spine of scaphocerite hardly longer than the antennular peduncle, distinctly shorter than the carpocerite ; blade reaching the middle of third antennular article, lower spine of basicerite as long as the stylocerite and projecting straight forward, upper spine small, measuring, in a lateral aspect, one-fourth of the lower. Telson 2,53-times as long as the posterior margin is broad, the latter as in Syn. strepto- dactylus, with the outer angles acute, though not prominent ; greatest width twice as long as the posterior margin. Spinules of upper surface 0,07 — 0,08 mm. long, much smaller than those of Syn. streptodactylus and situated close to the lateral margins; while in Syn. strepto- dactylus the anterior pair is always situated before the middle, it is in this species situated posterior to the middle, the proportion between the length of the telson and the distance of the anterior pair from the posterior margin being 2,19. The proportion between the distances of the two pairs from the posterior margin is indicated by the number 1,7. In both chelipeds the upper margin of the brachium ends in a minute, acute tooth ; fingers of the large chela a little longer than those of Syn. streptodactylus. Small chela as in this species, fingers 1 mm. long, total length 2,3 mm., height 0,76 mm., proportion between the total length and the height 3, proportion between the length and the height of the palm 1,71. First segment of the carpus stout, 4-times as long at thick distally, slightly shorter than the following segments taken together. The relative measurements of the third legs are: carpus i; merus 2,44; propodus 2,125. The merus, just as long as the carpus of the second legs, is 3,68-times as long as wide and bears, a little beyond the middle, a single spinule long 0,09 mm. The carpus, measured from articulation to articulation, appears to be 2,5-times longer than wide and presents a more slender form than in Syn. streptodactylus. The propodus is 5,66-times longer than wide, with 8 spinules long 0,09 — 0,1 mm. on the posterior margin, besides those at the distal extremity. Dactylus (0,39 mm.) half as long as the carpus and almost one-fourth of the propodus (1,7 mm.), 99 2 X2 of a stouter shape than in Syn. streptodactylus, the proportion between length and width beino- 2,51: for the rest it much resembles that of this species. The ventral hook is almost twice as long as broad at its base, the proportion being as 15:8: the dorsal hook is just half as broad at its base as the other, hardly shorter, the proportion being as 15:14, and it makes an acute angle with the ventral hook; as in Syn. streptodactylus both hooks are slightly diverging. Relative measurements of the fourth legs: carpus 1 ; merus 2,15; propodus 2,11. The merus is 3,52-times longer than wide, with one very small spinule, long 0,06 mm., nearly in the middle; carpus, as in the third legs, 2,5-times as long as wide; propodus 5,43-times as long as wide, bearing 7 spinules long 0,07 — 0,08 mm., besides those at the distal extremity. Dactylus 0,38 mm. long, just one-fourth the length of the propodus, a little more than half as long as the carpus and resembling that of the third legs; proportion between length and width 2,7; ventral hook twice as long as thick at its base, the proportion being as 16:7, dorsal hook a little more than half as broad at its base, the proportion being as 4,3 : 7, and hardly shorter, the proportion between the length of both hooks being as 16 : 15. The anterior margin of the dactylus is slightly sinuate, like that of the third legs, but it is not so regularly arcuate as in Syn. streptodactylus. The third and' the fourth legs are, in both species, equally setose. Length 1 1,5 mm. f 12. Synalphciis modest as de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 115. Stat. 240. November 22 till December 1. Banda. Reef. 1 specimen, probably a male. A new species of the Neomeris group, closely related to Syn. streptodactylus Cout. The rostrum of this specimen which is 11 m. long, is si en der, five times as long as wide at its base and it reaches just beyond the middle of median antennular article; the frontal spines, spiniform and acuminate like the rostrum, are directed straight forward or perhaps a little inward and are much shorter than the rostrum, for they only reach to the distal fourth of the visible part of first antennular article. The rostrum is slightly curved upward at the tip and, in a lateral view, appears to be situated at a somewhat lower level than the lateral spines. Telson 2,375-times as long as the posterior margin is broad, proportion between the greatest width and that of the posterior margin 1,77; outer angles of the latter acute, spini- form, though much shorter than the rounded, median part of the margin. The spinules of the anterior pair on the upper surface are 0,13111111. long, those of the posterior pair 0,146111111., and they are situated as in Syn. streptodactylus, though much c 1 o s e r to the lateral margins ; as in this species, the anterior pair is placed before the middle, the proportion between the length of the telson and the distance of the anterior pair from the posterior margin being 1,84 and the proportion between the distances of both pairs from the posterior margin is 1,48. The telson of Syn. streptodactylus is always somewhat longer with regard to the width of the posterior margin and the spinules of the upper surface are somewhat farther distant from the lateral margins. Second antennular article a little longer than wide, its length being about two-thirds that of the visible part of basal article, the third a little shorter than the second. Stylocerite spiniform, acuminate, reaching to the distal third of median article. Carpocerite of a stouter shape than that of Syn. streptodactylus, 3,35-times longer than wide (that of Syn. streptodactylus 4,1-times), extending beyond the antennular peduncle by half the distal article; lateral spine of the basicerite a little shorter than the stylocerite, reaching to the 2nd third part of median antennular article ; upper spine directed ontward, reaching about to the middle of basal article. Terminal spine of scaphocerite slightly curved inward, just reaching beyond the carpocerite and projecting by one-third of its length beyond the blade, which is rather broad and extends to just beyond the middle of third antennular article. Merus of large cheliped 2,18-times as long as wide, the slightly arcuate, upper margin ending in an acute spiniform tooth. The relative measurements of the large chela, taken along the infero-external side, are the following: fingers 1, total length 4, height 1,5. The anterior margin of the palm carries, on the supero-internal side, an acute, spiniform tooth. Extremities of the fingers blue, with yellow tips. Merus of small cheliped 2,4-times as long as wide, upper margin with a spiniform tooth at the apex. Relative dimensions of the small chela: fingers i; total length 3,1; height 1,1 and this chela is 2,82-times as long as high. Merus of second legs 6-times as long as wide; first article of the carpus 4,64-times as long as thick, nearly as long as the chela, the fingers of which are slightly longer than the palm, but distinctly shorter than the sum of the four following articles, the proportion between the length of the first article and the sum of the following being 1,26; the 2nd, 3ld and 4th articles are of equal length. Relative dimensions of third legs: merus 2,61; carpus i; propodus 2,72. The distal' half of the merus, which is just 4-times as long as wide, is armed with 4 movable spinules of unequal length, the largest of which is 0,16 mm. long. The propodus, which is only 1,04- times as long as the merus, is rather slender, 7,3-times as long as wide and bears 9 rather short spinules, that are 0,066 — 0,146 mm. long, the three distal spinules being the longest of all. When measured from the proximal end of the anterior margin to the tip of the ventral hook, the dactylus, which is just 2,5-times as long as wide, appears to measure one-fewrth the length of the propodus. The ventral hook, which is twice as long as broad at its base, measures one-fourth the distance between its tip and the proximal extremity of the anterior margin while it makes an obtuse angle with the posterior margin of the dactylus; this hook is subacute, its posterior margin is straight, the anterior slightly curved and, when examined under the microscope, the finely striated anterior wall appears twice as thick as the posterior. The tapering, pointed, dorsal hook, which is 3, 4-times as long as broad at its base, is a little longer than the other and the ventral hook is one and a half as broad at its base as the dorsal; both hooks slightly diverge, but the angle they make with one another, is rounded. In Syn. streptodactylus the dactyli of the third legs show a more slender form, being 3-times as long as wide at their base; the ventral hook is also more elongate, 2,5-times as long as wide at its base and the anterior wall «of this hook is usually as thick as the posterior, rarely a little thicker, but never twice as thick; the dorsal hook, finally, that makes 234 an acute angle with the other, is half as thick at its base as the ventral and not longer than it. The relative dimensions of the fifth legs are: merus 1,5; carpus 1 ; propodus 1,87; the merus is 4,5-times, the propodus 8-times as long as wide. The dactylus measures one-fourth the length of the propodus and has the same form as that of the third legs, being 2,6-times as long as wide at its base ; the hooks present also the same features, but the dorsal hook is hardly longer than the other. f13. Synalpheus Pococki Cout. Synalpheus neomeris var. Pococki H. Coutière, in: Buil. Soc. Entomol. France, 1S98, N° 7, p. 167 and in: Buil. Muséum de Paris, 1900, N° 8, p. 411. Synalpheus Pococki H. Coutière, in: Proc. U.S. Nat. Museum, 1909, p. 9. Stat. 273. December 23/26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 13 m. Sand and shells. 1 egg-bearing female. This specimen is 12,5 mm. long and fully accords with the description. The three frontal spines project straight forward and are quite glabrous; the slender rostrum which is 3-times as long as wide at base, reaches almost the end of first antennular article whereas the supraorbital spines that are decidedly directed inward, are somewhat shorter, extending to the distal third of the visible part of first article. The second article of the antennular peduncle measures almost two-thirds the visible part of the first, third article as long as the second ; the stylocerite reaches to the distal fourth part of second article. Carpocerite a little longer than the antennular peduncle, surpassing it only by one-third the distal article ; the terminal spine of the scaphocerite, the outer margin of which is distinctly concave, reaches as far forward as the carpocerite and projects by one- fifth of its length beyond the rounded tip of the rather broad scale which is but a little shorter than the antennular peduncle. The lower spine of the basicerite projects straight forward to the end of first antennular article, whereas the upper spine measures, in a lateral view, one-third of the lower and is directed upward. The telson resembles that of Syn. streptodactylus. The proportion between its length and the width of the posterior margin, the outer angles of which are acute, though not at all prominent, is 2,86, proportion between the greatest width and that of the posterior margin 2,1; like in this species, the spinules of the upper surface that are 0,1 mm. long, are situated just in front of the middle, the proportion between the distance of the anterior pair from the posterior margin and the length of the telson being 1,9; the two pairs of spinules are situated rather close together, the proportion between their distances from the posterior margin being 1,45. In both chelipeds the upper margin of the merus ends in a small spinule. The small chela which is 2,25 mm. long, presents the same proportions as that of Syn. streptodactylus: this chela is namely 3,2-times and the palm 1,95-times as long as high, whereas the proportion between the length of the chela and that of the fingers is 2,56. First carpal segment of second legs 4,71-times as long as thick distally, a little shorter than the following segments taken together. 235 The following legs are characteristic of this species. The merus of the third legs is 3,56-times as long as wide and armed with 2 spinules, long 0,1 — o, 12 mm., on the distal half of the posterior margin; carpns 2,2-times as long as wide; propodus slender, slightly a r c u a t e, 6, 7-times as long as wide and presenting only two small spinules, that are 0,1 mm. long, on the concave, posterior margin, besides two or three at the distal end; the first of these spinules is inserted a little posterior, the other a little anterior to the middle. Coutière figures 3 spinules instead of 2 on the posterior margin. The dactylus measures one- fourth the propodus and has a rather stout shape, the proportion between its length and the width at the base being 2,46. The conical ventral hook, that is hardly longer than broad at its base, measures only one-eighth the length of the dactylus; the dorsal hook, the posterior margin of which runs parallel with that of the other, is slightly longer, 3-times as long as broad at its base and almost half as broad at its base as the ventral hook. This leg bears only a few short setae, especially on the anterior margin of the joints. The fourth legs closely resemble the third, but the merus, 3,5-times as long as wide, bears but one spinule long 0,066 mm. just in front of the middle and on the propodus, which is 6,46-times as long as wide, the first of the two spinules that occur on the posterior margin of the third legs, is wanting. The dactylus, finally, though for the rest agreeing, appears longer than one-fourth of the propodus, the propodus being 1,68 mm. long, the dactylus 0,49 mm. In the third legs the merus is 2,31-times, the propodus 2,44-times as long as the carpus; in the fourth legs these numbers are, for the merus 2,11, for the propodus 2,4. In both legs the dactyli show the same length, but, the propodus of the third legs being 1,1 3-times as long as that of the fourth, the dactylus of the fourth appears comparatively longer. Eggs few in number, large, 1,3 — 1,4 mm. long, presenting two black eye-spots. General distribution: Holothuria Bank, X. W. Australia (Coutière); Macclesfield Bank, Arafura Sea (Coutière); Albany passage, Torres Straits (Coutière). f14. Synalpheus Iocasta de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI. 1909, p. 119. Stat. 71. May 10 — June 7. Makassar and surroundings. Depth up to 32 m. Mud, sand with mud, coral. 1 ova-bearing female. Stat. 116. July 12. o°58'.5N., I22°42'.5 E. West of Kwandang-bay-entrance. 72 m. Fine sand with mud. 2 specimens, one of which with eggs. Stat. 144. August 7/9. Anchorage north of Salomakiëe-(Damar-)island. 45 m. Lithothamnion. I ova-bearing female. Stat. 164. August 20. i°42'.5 S., I30°47'.5 E. Between Misool and New Guinea. 32 m. Sand, small stones and shells. 15 specimens, most of which are ova-bearing. Stat. 204. September 20. 4°2o'S., I22°58'E. Between islands ofWowoni and Buton; northern entrance of Buton-strait. From 75 — 94 m. Sand with dead shells. 1 specimen. Stat. 240. November 22 till December 1. Banda-anchorage. Lithothamnion- bank in 18 — 36 m. 1 female with eggs. Stat. 273. December 23 '26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 13 m. Sand and shells. 4 specimens, 2 of which with eggs. Stat. 274. December 26. 5°28'.2S., I34°53'.9E. Off Pulu Jedan. 57 m. Sand and shells. Stones. 1 young specimen. 103 236 Stat. 282. January 1 5/ 1 7. S°25'.2S., i27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 2 egg-bearing females; in one of them a parasite occurs on the lower side of the abdomen. Stat. 2S5. January 18. 8°39'.iS., I27°4'.4E. Anchorage South coast of Timor. 34 m. Litho- thamnion. 3 specimens, one of which with eggs. Stat. 305. February 8. Mid-channel in Solor-strait off Kampong Menanga. 113 m. Bottom stony. 5 specimens, 2 of which with eggs. Stat. 310. February 12. 8° 30' S., U9°7'.5E. Ji m. Sapeh Strait. Sand with few pieces of dead coral. 7 specimens, 5 of which with eggs. Syualphats Iocasta, a new form of the Neomeris group, is most closely related to Syn. Pococki Cout., a species inhabiting the eastern parts of the Indian Archipelago, and is especially remarkable because of the great variability, presented by all its characters. The frontal spines are obliquely directed downward, their tips not curved upward ; the rostrum, 2,5-times as long as wide at its base, reaches to the distal third of the visible part of first antennular article and, as in Syn. Pococki, Syn. streptodactylus and other species, is separated from the lateral spines by the obliquely descending, antenor wall of the carapace ; lateral spines with sharply pointed tips, a little shorter than the rostrum, longer than broad, distinctly turned inward and with their outer margin slightly concave at the base. Second antennular article half as long as the visible part of the first, as long or hardly longer than the third, second article almost as broad as long; stylocerite reaching to the 2nd third or to the middle of second article. Lower spine of the basicerite almost as long as first antennular article, upper spine half as long as the lower. Carpocerite 3,66-times as long as wide and surpassing the antennular peduncle by one-half or two-thirds the length of the distal article; outer margin of scaphocerite slightly concave, lateral spine straight, almost as long as the carpocerite or as long or hardly longer than the antennular peduncle and surpassing by one-fourth of its length the scale which is 5-times as long as wide. Sometimes, as in the female N° 4 (Table A) from Stat. 1 64, the rostrum is much shorter, considerably shorter than the lateral spines and not yet reaching the middle of the visible part of first antennular article, in other specimens from the same Station it hardly reaches beyond the middle of this visible part and projects horizontally forward, while the lateral spines are slightly directed downward; in other specimens the lateral spines are hardly shorter than the rostrum and directed straight forward or slightly outward, whereas the stylocerite hardly surpasses the first antennular article, in other ones the lower spine of the basicerite is shorter, hardly projecting beyond the supraorbital spines. All these differences are regarded as being individual. As is shown by Table A, the measurements of the telson are much variable. So e. g. in the female from Stat. 285 the length of the telson equals 2,47-times, in that from Stat. 273 3,1-times its posterior margin, but the Table proves that all possible, intermediate proportions are also observed. The outer angles of the posterior margin are spiniiorm, half as long as the contiguous short spinules; the posterior margin is rather prominent in the middle, almost semicircular. Spinules of upper surface 0,13 — 0,17 mm. long, sometimes, as in the female N° 2 from Stat. 116, 0,11 mm.; the anterior pair of these spinules that are situated not far from the lateral margins, are inserted more or less before the middle, as in Syn. Pococki, 104 and the proportion between the distances of both pairs from the posterior margin is much the same as in Syn. strcptodactylus, whereas in Syn. Pocockï the two pairs are placed closer together. The external maxillipeds project with half their terminal joint beyond the tip of the carpocerite. Merus of large cheliped twice as long as broad, with a small spine at the apex of the upper margin ; the chela resembles that of Syn. Pococki and one observes a curved spine at the anterior margin of the palm. Merus of small cheliped 2,46-times as long as broad, also with a spinule at the apex of the upper margin. Relative dimensions of the small chela: fingers i; total length 2,54 — 2,72; height 0,76 — 0,8. In the female, long 12,5 mm., from Stat. 282 the first carpal segment of the second legs is 5,75-times as long as thick and distinctly longer than the sum of the following; in the female, long 12 mm., from Stat. 310, in which the eggs present a large size, that proportion between length and thickness of the first segment is 4,4 and this segment appears here a little shorter than the sum of the following. Intermediate proportions 5, 5,6 and 5,65 were, however, also met with respectively in the ova-bearing specimens taken at the Stations 310, 285 and 116, so that we may conclude that these numbers are rather variable. The same variability with regard to the dimensions and their proportions was observed in the following legs, as is proved by the Tables C and D. Sometimes the merus and the propodus of the third and fourth legs are of equal length, in other specimens the merus appears longer than the propodus or shorter than it, and the proportion between the length of these joints and that of the carpus is also quite variable. As regards the proportion between the length and the width of the joints (Table D) a similar variability is observed, but here also all intermediate proportions occur. The merus of the third legs, which bears one or two spinules, long 0,07 — 0,1 mm., is 3,5 — 4, 14-times (rarely, N° 4, 3,23-times) as long as wide, the propodus 5 — 6,75-times, but the intermediate proportion 6 also often occurs; the propodus is armed with 7 — 10 spinules which are 0,1 — 0,18 mm., rarely o,oS mm., long, besides those at the distal extremity. Different from Syn. Pococki the propodi are in this species nearly straight, not conspicuously curved as in that species. The dactyli, measured from the proximal end of the anterior margin to the extremity of the ventral hook, usually appear to be o n e- third or a little more than one-third of the propodus, sometimes, as in the female N" 4, two-fifths, or rarely, as in the female N° 10 of Table D, they are slightly shorter than one- third. As in Syn. Pococki the dactyli are sickle-shaped, but they are more si en der, 3 — 3,5-times as long as broad at their base, rarely, as in the female N° 10, less than 3-times. Yentral or principal hook usually shorter than in Syn. Pococki, measuring lJu — l/l7 of the total length of the dactylus, and a little broader at its base than it is long; dorsal hook a little longer, reaching for a short distance beyond the other. The lower or posterior margin of the dactylus appears regularly concave without any prominence and, examined under the microscope, appears to thicken gradually until to the distal sixth part of the joint and it then again narrows towards the tip of the ventral hook ; in that thickened part of the margin fine oblique striae are observed ; the anterior margin is also slightly thickened, though in a much SIBOf.A- EXPEDITIE XXXIX aK 31 less desrree. The inner maroqns of the hooks are continued for a short distance into the interior of the joint, being here apparently coalesced. The fourth lees ag-ree vvith the third and I refer to the Tables. The merus bears o n e small spinule long 0,04 — 0,07 mm. just beyond the middle or quite in the middle of the posterior margin and the posterior margin of the propodus bears 5 — 8 spinules, long 0,08 — 0,17 mm., besides those at the distal extremity: the female N° 4 from Stat. 273 makes an exception, the 5 spinules are shorter than usüally, 0,046 — 0,06 mm. long. The dactyli measure two-fifths of the propodus, sometimes they are a little shorter or a little longer, and they are 3,1 — 3,33-times as long as wide at their base. In the female N° 10 from Stat. 310 they measure just one-third the length of the propodus and are 2,7-times as long as broad; in this female the ventral hook measures */9 the length of the dactylus and appears slightly longer than broad at its base, so that the dactylus more resembles those of Syn. Pococki. In the other more typical specimens the ventral hook measures yiB — V20 tne length of the dactylus. The third and the fourth legs are much more setose than those of Syn. Pococki. Table A does not only show the variable length of the ova-bearing females, but also the variable size and number of the eggs: in two females from Stat. 310 the eggs are extra- ordinarily large. Table A. NO 1. N» 2. N« 3. NO 4. NO 5. NO 6. No 7. N» 8. N° 9. N° 10. No 11. N° 12. N« 13 Length of female 12 10 9,5 10—11,5 12 8,5—io 12,5 12 10,5 10 12 ".5 10 Length of eggs 0,7—0,8 o,75 0,6—0,7 0,7—0,85 0,7—0,8 0,9—1 o,7 o,95 o,75—o,S5 0,9 i,7 0,76 — 0,8 1,5 Number of eggs 5° 15 12 15 — 20 20 10 100 10 20 10 3 40 8 N° 1 Stat. 71; N" 2 Stat. 116; N° 3 Stat. 144; N° 4 Stat. 164; N° 5 Stat. 240 ; N° 6 Stat. 273; N° 7 and 8 Stat. 282; N° 9 Stat. 285; N° 10 Stat. 305; N° 11 — 13 Stat. 310. Table B. No 1. No 2. N° 3. NO 4. N° 5. N° 6. N> 7. N> 8. N"o 9. N» 10. Proportion between length of telson and width of posterior margin Proportion between the greatest width and that of the posterior margin Proportion between length of telson and the distance of the anterior pair of spinules from the posterior margin Proportion between the distances of the two pairs of spinules from the posterior margin . .93 i,7 1,63 2,55 2,65 3,1 2,72 2,5 3 2,54 2,76 i,9 2 2 2 i,93 2,1 2 2 i,75 1,66 1,73 i,86 i,94 1,82 1,81 1,62 1,63 1,62 i,6 i,59 i,7i i,54 i,54 i,55 3 2,1 1,65 1,76 N° 1 Stat. 116; N° 2 and 3 Stat. 164; N° 4 Stat. 282; N° 5 Stat. 285; N° 6—8 Stat. 305; N° 9 and 10 Stat. 310. 106 ■39 Table C. Relative measurements of the third and fourth legs. Merus Carpus Propodus Merus Carpus Propodus of third legs of fourth lees N» i. N» 2. No 3. NO 4. N» 5. N« 6. N° 7. N° 8. N"o 9. N° 10. 2,33 I 2,32 2,o8 I 2,25 2,41 2,27 2,5 2,21 2,25 2,33 2,36 2,23 I I I 1 1 1 1 1 2,41 2,12 2,26 2,42 2,25 2,08 2,15 2 2,1 2 2,21 1,92 2,06 2,26 2,15 2,1 I I I I 1 1 1 1 2,24 2,07 2,2 1 1,88 2,2 2,13 2,12 2,14 X° 1 Stat. 116; N° 2 and 3 Stat. 164; N° 4 Stat. 273; N° 5 Stat. 274; N° 6 Stat. 282; N° 7 Stat. 2S5; N° 8 Stat. 305; N° 9 and 10 Stat. 310. Length of the merus Width of the merus Proportion between length and width of the merus Length of the carpus Width of the carpus Proportion between length and width of the carpus Length of the propodus Width of the propodus Proportion between length and width of the propodus Length of the dactylus Width of the dactylus Length of the merus Width of the merus Proportion between length and width of the merus Length of the carpus Width of the carpus Proportion between length and width of the carpus Length of the propodus Width of the propodus Proportion between length and width of the propodus Length of the dactylus Width of the dactylus N° 1 Stat. 116; N° 2 and 3 Stat. 164; N° 4 Stat. 273; X" 5 X,J 7 Stat. 285; XIJ 8 Stat. 305; X° 9 and 10 Stat. 310. All are ova-bearing females, except N° 5 that is a very young 107 Table D. No 1. No 2. No 3. No 4. N« 5. N» 6. NTo 7. N« 3. NTo 9. N*> 10. i,45 i,5 i,5 1,1 0,84 1,8 i,7 i,7 i,45 1,56 o,353 0,428 0,406 o,34 0,21 0,48 0,41 0,48 0,412 o,4oS 4,i 3,5 3>7 3,23 4 3,75 4,i4 3-54 3,52 3,32 0,6 0,66 0,6 o,54 0,38 0,8 o,73 0,72 0,65 0,67 0,25 o,3 0,28 0,24 0,16 o,33 0,28 0,29 0,28 o,3 p' . 2,4 2,2 2,1 2,25 2,4 2,4 2,6 2,5 2,32 2,23 i,45 i,4 1,36 1,05 0,92 1,8 1,52 i,55 1,32 i,55 0,215 0,265 0,255 0,206 0,15 0,29 0,25 0,26 0,254 0,256 6,75 5,28 5-33 5 6,1 6,2 6 6 5,2 6 0,52 0,52 o,55 0,4 o,35 0,63 0,52 o,53 0,51 o,47 0,146 0,17 0,18 0,145 0,1 0,21 0,16 0,15 0,17 0,17 1,2 1,2 1,24 0,92 0,/ 1,48 i,4 i,4 i,iS 1,25 0,27 o,34 o,33 0,285 0,17 0,386 o,3i5 o,37 0,325 o,334 4,44 3,52 3,76 3,23 4,12 3,84 4,44 3,8 3,63 3,74 O 0,57 0,6 0,56 0,48 0,32 0,72 0,62 0,65 0,56 0,6 0' 0,25 0,26 0,26 0,22 0,14 o,3 0,26 0,26 0,26 0,27 pt 2,3 2,3 2,1 2,2 2,4 2,4 2,4 2,5 2,15 2 2 1,28 1,24 1,24 0,9 0,84 1,58 1,32 i,33 1,2 i,35 w o,i95 0,235 0,235 0,196 0,13 0,26 0,22 0,24 0,23 0,225 6,56 5,28 5,28 4,6 6,46 6,1 6 5,75 5,22 6 o,5 o,5 o,54 0,38 0,32 0,64 0,51 o,5 0,48 o,45 0,15 0,16 0,17 0,12 0,09 0,21 o,i55 0,16 0,16 0,166 Stat. 274; X° 6 Stat. 282; specimen and X° 8 a male. 240 Synalpheus Iocasta differs from Syn. Pococki Cout. at first sight by the different form and characters of the propodi of the three posterior legs. f 15a. Synalpheus par aneomeris Cout. var. pracdabundus de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 123. Confer: H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 872, PI. LXXI, fig. 7. Stat. 34. March 27. Anchorage off Labuan Pandan, Lombok. Coralreef. 2 young specimens. Stat. 37. March 30/31. Sailus ketjil, Paternoster-islands. Coralreef. 1 ova-bearing female. Stat. 129. July 22/23. Anchorage off Kawio- and Kamboling-islands, Karkaralong-group. Reef. 4 specimens, 2 of which with eggs. Stat. 250. December 6/7. Anchorage off Kilsuin, West-coast of Kur-island. Reef. 3 specimens, 1 of which with eggs. These specimens show a few slight differences from the typical form of Syn. par aneomeris Cout. and are therefore described as a new variety : the specimens taken at Stat. 129 are regarded as the types of this variety. Rostrum and lateral frontal spines as in the typical species (H. Coutière, 1. c. fig. 7'), but they are more acuminate and the tips of the lateral spines are distinctly turned inward. Carpocerite 3,54-times, in the typical species 4-times as long as wide; scaphocerite, lower spine of the basicerite, antennular peduncle and stylocerite exactly as in the typical form. Telson a little shorter and a little less wide anteriorly with regard to the width of the posterior margin than in the variety halmahcrcnsis\ anterior pair of spinules, long 0,16 mm., usually situated a little before the middle, rarely just in the middle, but never, as in the variety halmaher ensis, posterior to the middle. The spinules of the upper surface are a little farther remote from the lateral margins than in the typical species and than in the variety halmaher ensis, they are situated as in the variety prolattis\ posterior margin as in the typical species, the outer angles, however, acute. The two chelipeds apparently accord with those of the typical species (Coutière, 1. c, &g- 7ai 7^)i but the upper margin of the merus ends in a small acute tooth. Merus of second legs 5,8 — 6-times as long as wide; first carpal segment 5 — 5,3-times as long as thick, slightly shorter than the sum of the following, second segment a little longer than the third, third as long or a little longer than the fourth ; the chela, the fingers of which are hardly longer than the palm, appears a little more than one and a half as long as the fifth segment. Relative dimensions of the third legs: carpus i; merus 2; propodus 1,64 or: carpus i; merus 1,94; propodus 1,63. Merus 3,56 — 3,58-times as long as wide, of a stouter shape than in the typical species, in which it is 4-times as long as wide ; propodus 5,53 — 5,75-times as long as wide, armed with 6 or 7 spinules, that are 0,15 — 0,16 mm. long. The length of the dactylus, measured from the proximal encl of the anterior margin to the tip of the ventral hook, is a little more than one-fourth the propodus ; the dorsal hook appears decidedly longer than the other, which, at its base, is one-third thicker than the dorsal hook. Relative dimensions of the fourth legs: carpus i; merus 1,8; propodus 1,7 or carpus i; merus 1,85; propodus 1,71. Merus 3,38 — 3,42-times, propodus 5,66 — 5,46-times as long as 108 241 wide, the merus stouter than in the typical form ; propodus with 6 spinules, that are 0,146 mm. long. Ova ó,S — 0,82 mm. long. The largest of the four specimens, the ova-bearing female, is 14 mm. long. The largest specimen from Kur-island is the ova-bearing female, long 10 mm.; the eggs are larger than those of the described specimens from Stat. 129, viz. 1 — 1,1 7 mm. long. These specimens resemble the preceding, but the second legs have a stouter form, probably due to their smaller size : the merus is 5,4-times as long as wide, the first segment of the carpus 4,4-times as long as thick, the third slightly longer than the second, the chela twice as long as the 5th segment and the third segment appears a little larger than the second. The relative dimensions of the third legs are: carpus 1 ; merus 1,98; propodus 1,72; these joints, like also the dactylus, have the same form as in the preceding specimens. The eggs of the female, long 12,5 mm., from Stat. 37 are 0,73 mm. long; though the legs are missing, it seems to belong to the same variety as the specimens from Stat. 129. The two young individuals from Stat. 34, finally, approach to the typical species which occurs in the Maldive and Laccadive Archipelagoes, by the more slender form of the meri of the third and fourth legs. The relative dimensions of the third legs are, in the younger specimen, which is 8 mm. long: carpus i; merus 2,16; propodus 1,9; the merus is 3,86-times, the propodus 6,3-times as long as wide and there are 6 propodal spinules. Table. Proportion between length of telson and width of posterior margin .... Proportion between the greatest width and that of the posterior margin . Proportion between the length of telson and the distance of the anterior pair of spinules from the posterior margin Proportion between the distances of both pairs of spinules from the posterior margin No 1. NO 2. NO 3. 2,43 2,4 2,35 l>9 1,88 i>7 2 i,75 i,7 i>73 2 !,9 No 4. 2,5 1.93 1,8 N° 1 and 2 Stat. 129; X" 3 ova-bearing female from Kur-island; N° 4 younger specimen from Stat. 34. f 1 5 ó. Synalpheits paraneomeris Cout. var. prolatus Cout. Synalpheus paraneomeris H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 872, PI. LXXI, Fig. 7. Synalpheus paraneomeris prolatus H. Coutière, in: Proc. U.S. Nat. Mus. XXXVI, 1909, p. 9. Stat. 152. August 12/13. Wunoh-bay, N.W. coast of Waigeu-island. Reef. 1 egg-bearing female. Stat. 209. September 23. Anchorage off the south point of Kabaëna-island. Reef. 1 ova- bearing female. Together with the two specimens of the new variety halmaherensis, an ova-bearing female was collected at the same Station, which is referred to the variety prolatus Cout. with much doubt not only because a proper description of this variety does not exist, as far as I know, but still more because this specimen does not fully accord with the quoted figure 7 of Coutière's paper, on which this form is represented. 109 242 The rostrum, 3-times as long as wide at its base and reaching almost the end of basal antennular article, agrees, like also the lateral spines, with the quoted Fig. 7 : the rostrum appears more slender than in the typical species, Fig. 7', and than in the variety halmaher ensis. The visible part of the first antennular article appears, however, distin ctly long er than in Fig. 7 and nearly as long as the second and the third taken together; the second article is slightly longer than wide and the third slightly shorter than the second, the stylocerite, finally, extends only to the middle of the second article. It is especially on account of the different shape of this peduncle that the identification with the variety prolatus remains doubtful. The carpocerite which surpasses the antennular peduncle almost by two thirds the distal article, is 3,7-times as long as wide and the lower spine of the basicerite appears a little shorter than the stylocerite; the scale, hardly as broad as in Fig. 7, is as long as the antennular peduncle and the terminal spine that distinctly surpasses the carpocerite, is slightly curved inward, while it appears quite straight in Fig. 7. Telson 2,7-times as long as the posterior margin is broad, in the typical species 2,5- times, but a little less wide anteriorly, the proportion between the greatest width and that of the posterior margin being 1,92; the outer angles of the posterior margin are acute, though quite short. Of the spinules of the upper surface that are 0,12 mm. long and a little farther remote from the lateral margins than in the typical species, the anterior pair is situated more forward, anterior to the middle, the proportion between the length of the telson and the distance of that pair from the posterior margin being 1,84; the proportion, finally, between the distances of both pairs from the posterior margin is expressed by the number 1,65. The large cheliped seems to agree with that of the typical species, but the merus which is 2,56-times as long as wide, bears a small, acute tooth at the apex of the upper margin-, the small cheliped is missing. Merus of second legs 6-times as long as wide; first segment (1,1 7 mm.) of the carpus 5,8-times as long as thick, a little longer than the sum (1 mm.) of the following; the three following segments slightly decrease in length from the second to the fourth, fifth segment a little longer than the second and the third taken together; chela (0,84 mm.) slightly shorter than the four last segments combined. Following legs as in the typical species. The relative dimensions of the third pair are: merus 2,1 ; carpus 1 ; propodus 2. Merus 3,8-times, propodus 6,7-times as long as wide, the propodus with 6 spinules long 0,13 — o, 16 mm. Dactylus two-sevenths of the propodus and 2,5- times as long as wide near the articulation, when measured from the proximal extremity of the anterior margin to the tip of the ventral hook, the latter as long- but a little more than twice as thick at its base as the dorsal hook ; posterior margin as in the typical species (Fig. jd"). The relative dimensions of the fourth legs are: merus 1,97; carpus i; propodus 2,05. Merus 4-times, propodus 6,8-times as long as wide, the latter with 6 spinules; dactylus as in the third legs. Eggs small, 0,65111111. long. This specimen is 1 2 mm. long. The female from Stat. 209, which is 1 1 mm. long, is referred to the same variety, because the terminal spine of the scaphocerite also surpasses the carpocerite, which lias the same form as in the preceding specimen. This female, however, which has lost the large cheliped, shows some differences from the female taken off the island of Waigeu. The rostrum is shorter, 2,5-times as long as wide at base and extends to the distal third of the visible part of basal antennular article. Third antennular article hardly shorter than the second. Lateral spine of basicerite slightly longer than the stylocerite that reaches to the middle of median article. The telson is 2,4i-times as long as the posterior margin is wide, proportion between the latter and the width at base 1,94. The spinules of the upper surface are 0,15 mm. long, but arranged exactly as in the specimen from Stat. 152, the proportion between the length of the telson and the distance of the anterior pair from the posterior margin being 1,83, while the proportion between the distances of both pairs from the posterior margin is indicated by the number 1,7. The second and following legs present a less slender form than in the other specimen. Merus of second legs 5-times as long as wide, first carpal segment 4,5-times as long as thick, just as long as the sum of the four following. Relative dimensions of third pair: merus 2,1; carpus i; propodus 2,1. Merus 3,2-times, propodus 5,6-times as long as wide, the latter with 7 spinules, long 0,16 — 0,2 mm. Dactylus two-sevenths the propodus and 2,7-times as long as wide. Eggs 0,8 — 0,88 mm. long. General distribution: Djibouti, Mascate, Mahé, Maldive and Laccadive Archi- pelagoes (Coutière). f 15^. Syua/p/ieus paraneoiueris Cout. var. halmaherensis de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI. 1909, p. 122. Confer: H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 872, PI. LXXI, fig. 7. Stat. 152. August 12/13. Wunoh-bay, N.W. coast of Waigeu-island. Reef. 1 male and 1 egg- bearing female. On Plate LXXI of the quoted paper, Fig. 7 apparently represents the aoxyceros" form, for which Coutière has recently created the name Syji. paraneomeris prolatits (in : Proc. U. S. Xat. Mus. 1909, p. 9), while Fig. 7' represents the typical species; unfortunately the author did not indicate to which form the other figures belong, to the typical species or to the sub- species prolatus. Though according to Coutière this species is a rather variable form, I prefer to describe the two specimens taken in the Halmaheira Sea as a distinct variety. Rostrum triangular with converging lateral margins as in the typical species (1. c. Fig. 7'), but longer, reaching almost to the end of the first antennular article, acute, a little more than twice as long as broad at its base; lateral spines also pointed and acute, a little shorter than the rostrum, as in Fig. 7, but with the inner margins concave. The telson of the male much resembles Fig. *je (1. e.), but the spinules of the upper surface that are 0,12 mm. long, are situated a little more backward ; in the female which is larger, the telson is somewhat longer, the width of the posterior margin being just one-third the length (Table A). The antennular peduncle resembles that of the variety prolatus (Coutière, l.c. Fig. 7); the second article, one-fourth shorter than the visible part of the first, appears distinctly somewhat 244 w i d e r, at the apex, than long and the third article is one-fourth longer than the second ; the stylocerite extends to the distal fifth part of the second article. Basicerite unarmed above, lateral spine a little shorter than the stylocerite and reaching to the middle of second antennular article; carpocerite 3-times as long as wide, in the typical species 4-times (H. Coutière, in: Buil. Soc. Philom. Paris, Sér. IX, T. XI, 190S, p. 5) and surpassing the antennular peduncle by about two-thirds the third article; scale rather broad, as in Fig. 7 (1. c. 1905), its width being one-fifth the total length of the scaphocerite, the scale just as long as the antennular peduncle, terminal spine a little shorter than the carpocerite. The female has lost both chelipeds, the male possesses only the small one. In this cheliped the merus is 21/8-times as long as wide, the upper margin bears a small, acute tooth at the apex; the relative dimensions of the chela are: fingers i; total length 2,66; height 0,94, the chela being 2,85-times as long as high. The second legs of the male resemble those of the typical species. Merus 5,84-times as long as thick. First segment (1,25 mm.) of the carpus 5, 3-times as long as thick distally and slightly longer than the sum (1,16 mm.) of the following; fifth segment as long as the second and the third together, the third slightly longer than the second; chela (1 mm.) twice as long as the fifth segment. Relative dimensions of the third legs in the male: merus 2,1; carpus i; propodus 1,8. Merus 3,8-times, propodus 6-times as long as wide, the latter with 6 spinules long 0,14 — 0,16 mm. According to Coutière's description (1. c. 1905) the merus should be 4,5-times, the propodus 8-times as long as wide and the propodus should be armed with 5 or 6 spinules ; in another paper, however, in: Buil. Soc. Philom. Paris, 1908, p. 5 the merus is described as being 4-times as long as wide and the propodus with 8 spinules. The length of the dactylus, measured from the proximal extremity of the anterior margin to the extremity of the ventral hook, appears to be one-fourth the length of the propodus and 2, 4-times as long as the dactylus is wide near the articulation ; the dactylus accords with Fig. jd" of the original description, the dorsal hook appears a little more than half as thick, but decidedly longer than the other and one observes a slight, obtuse prominence on the posterior margin. The anterior margin of these legs is a little setose. The relative dimensions of the fourth legs are in the female: merus 1,8; carpus i; propodus 1,8. Merus 3,7-times, propodus 6-times as long as wide, the latter with 5 spinules long 0,15111111. Dactylus as in the third pair. Ova small, 0,6 mm. long. The ova-bearing female is 1 6 mm. long, the other specimen is a little shorter. Table A. Proportion between length of telson and width of the posterior margin Proportion between the greatest width and that of the posterior margin Proportion between the length of the telson and the distance of the anterior pair of spinules from the posterior margin . : Proportion between the distances of both pairs of spinules from the posterior margin . 112 No 1. cT 2,67 N» 2 9 3 2,1 2,1 2,3 2,1 1,675 1,86 245 f i6. Synalphcus C har on (Heller). Alpkeus Charon C. Heller, in: Sitzungsber. Kais. Akad. Wiss. Wien, Bd. XLIV, 1861, p. 272, Taf. III, Fig. 21, 22. Synalpheus Charon H. Coutière, Les Alphéidae, 1899, p. 264, Fig. 331, 332, 332bis and in: Alpheidae Mald. and Laccad. Archip. 1905, p. 873 and in: 1'roc. U. S. Nat. Museum, XXXVI, 1909, p. 90. Nee: Alp heus Charon J. G. de Man, in: Zoolog. Jahrb. IX, Abth. f. Syst. 1897, p. 743, Taf. 35, Fig. 65. Stat. 209. September 23. Anchorage off the south point of Kabaëna-island. Reef. 1 not yet full-grown specimen without eggs. Rostrum acute, spiniform, twice as long as wide at its base, reaching almost to the end of first antennular article, with the margins straight and converging from the base to the tip ; supraorbital spines also acute and pointed, one-third shorter than the rostrum, with the inner margins concave and separated from the rostrum by broad interspaces; outer margins also slightly concave. The supraorbital spines that are wider at their base than long, are, like the rostrum, glabrous and directed slightly downward. Anterior wall of the front partly visible from above, at either side of the rostrum. Second antennular article just as long as wide, one-fourth shorter than the visible part of first article, third about as long as second ; stylocerite extending to the distal fourth part of second article. The carpocerite, 3-times as long as wide, extends beyond the antennular peduncle almost by the whole length of the third article; lower spine of basicerite shorter than the stylocerite, reaching almost to the middle of second antennular article. The outer margin of the scaphocerite is slightly concave, the terminal spine which is not curved inward and which is as long as the carpocerite, exceeds the rounded tip of the scale by one-fourth of its length, while the scale is as long as the antennular peduncle. Superior angle of the basicerite rounded, truncate. Telson 3-times as long as the posterior margin is wide, the outer angles of the latter are acute, though not at all prominent; greatest width 2,1-times that of the posterior margin, which is rather prominent. Spinules of upper surface small, o, 14 mm. long, inserted not far from the lateral margins; proportion between the length of the telson and the distance of the anterior pair from the posterior margin 2,1, proportion between the distances of both pairs from the posterior margin 1,7. Merus of both chelipeds with a spiniform tooth at the apex of the upper margin. Large chela 6,4 mm. long, 2,5 mm. high, fingers 1,85 mm. long; proportion between the length and the height of the palm 1,8, proportion between the total length and the length of the fingers 3,45. A small, obtuse tubercle at the far end of the palm. The small chela has the following relative dimensions: fingers i; total length 2,75; height 0,975, tne chela 2,82-times as long (2,2 mm.) as high (0,78 mm.). Proportion between the length of both chelae 2,9. Merus of second legs 4,6-times as long as wide. The first segment of the carpus is 1 mm. long, 4-times as long as thick at the distal end and twice as long as the fifth, while it appears but a little shorter than the sum (1,1 mm.) of the four following segments. The chela, the fingers of 113 SIBOGA-EXPEDITIE XXXIXö'. 32 246 which are hardly longer than the palm, is 0,84 mm. long, almost as long as the first segment of the carpus. According to Heller the first segment should be as long as the sum of the three following, a difference probably due to the larger size of his specimens. Relative dimensions of the third legs : merus 2,2; carpus i; propodus 1,9. The merus, 3,1-times as long as wide, bears some short setae on both margins, especially on the upper and a tuft of longer setae at the far end of the latter. The carpus, 2,27-times as long as thick, and the propodus, 5-times as long as wide, are on their anterior border beset with rather Ion o- setae and the posterior margin of the propodus bears, besides those at the distal extremity, five spinules which are 0,13 — o, 16 mm. long. The dactylus, measuring somewhat less than one-third of the propodus, has a rather stout form, being, from the proximal end of the anterior margin to the tip of the ventral hook, twice as long as wide near the articulation. The obtuse ventral hook which is as long as wide at its base, is spoon-shaped and excavate and makes an acute angle with the pointed dorsal hook which is just as long but hardly half as thick at its base as the other; the slightly curved, dorsal hook is grown together with a process of the superior border of the dactylus to a little beyond the middle and appears therefore thickened along its proximal half. This specimen is 12,5 mm. long. Remarks. This species, no doubt identical with that observed by Coutière, seems to be also the species described by Heller, though, according to this author, the upper margin of the three posterior legs should be quite glabrous. The species, however, which was described by me (1. c. 1S97) under the name of Alp heus Charon, is apparently a different form. The three frontal spines are other wise shaped and, according to Fig. 63 of my paper, also the antennular peduncle, while the lateral spine of the scaphocerite is curved inward and hardly exceeds the scale; the telson appears a little shorter with regard to the width of the posterior margin. The third legs have a stouter form, the propodus is 4-times as long as wide and the dactylus also differs; the dactylus, indeed, measures a little more than one-third the propodus and is 2. 5-times as long as broad at its base, while, in my description, nothing is said about the excavate appearance of the ventral hook. The two described specimens had been received by me from the Museum at Vienna under the name of A. Charon Heller and had been collected by the Novara-Expedition at the Nicobar Islands. We must therefore conclude that Heller was mistaken when referring these specimens to the true Syn. Charon from the Red Sea and that he was misled by the apparent resemblance of both species. This different species may henceforth bear the name of Syn. Helleri (vide p. 194). General distribution: Red Sea (Heller); Maldive and Laccadive Archipelagoes (Coutière); Hawaiian Islands (Coutière). f17. SynalpJieus Nilandensis Cout. Synalpheus Nilandensis H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 871, PI. LXX, lig. 4. Synalpheus Nilandensis G. Nobili, Ricerche sui Crostacei della Polinesia, Torino 1907, p. 353. Stat. 51. April 19. Southern part of Molo-Strait. 70 m. Fine grey sand. 2 specimens. 114 247 Stat. 240. November 22 till December 1. Banda. Lithothamnion-bank in 18 — 36 m. 1 young specimen. The two specimens from Stat. 51 are 10 mm. long, that from Bancla 7 mm. In one specimen from Madura-bay the rostrum, somewhat shorter than the orbital spines, reaches only to the middle of the visible part of first antennular article ; the lower spine of the basicerite is slightly directed outward and is longer than the slightly divergent orbital spines, but does not attain the apex of first antennular article. In the other specimen the orbital spines diverge more outward, more than in Coutière's figure 4 (1. c); they hardly reach the middle of the visible part of the first antennular article, whereas the rostrum, distinctly shorter, extends to the 2nd third part of the latter. The stylocerite reaches to the end of first article and the lower spine of the basicerite is much shorter than the stylocerite, though reaching beyond the orbital spines. In this specimen the merus of third legs, which is armed with 5 spinules, is 3,7-times as long as broad, the carpus is 2,3-times as long as thick and the propodus which bears 8 spinules on its posterior margin, is 5,85-times as long as wide; as regards their relative dimensions, we must remark that the merus is 2,56-times, the propodus 2,23-times as long as the carpus. The dactylus which fully accords with Fig. \c' of the original description, measures one-fourth of the propodus and is just twice as long as broad at its base, when its length is measured from the propodal articulation, along the anterior margin, to the tip of the dorsal hook. Merus of fourth legs with 2 spinules, 3,73-times as long as wide; carpus 2,2-times as long as thick; propodus with 8 spinules, 5,5-times as long as wide; dactylus as in the third legs. The merus is 2,3-times, the propodus 2,2-times as long as the carpus. The slight differences, presented by these two specimens as regards the length and the direction of the orbital spines and of the rostrum, are considered as individu al, because in the specimen taken at Banda these three spines fully accord with the type (Coutière, 1. c. Fig. 4); the rostral and the orbital spines are distinctly curved upward, especially in the larger specimens from Stat. 5 1 . In the young specimen from Banda the merus of third legs with its 4 or 5 spinules appears somewhat more slender, viz. 4,3-times as long as wide; the carpus is 2,3-times as long as thick, the propodus, with 7 spinules, appears 6,2-times as long as wide; dactylus as in the preceding specimen. The proportion between length and width of these joints, especially of the propodus, proves to be somewhat variable, just as in the variety bandaensis. The large cheliped fully resembles that of Syn. ncomeris (J. G. de Man, in: Zoolog. Jahrb. X, Abth. f. Syst. 1897, PI. 35, Fig. 61a). In the other specimen from Stat. 51 the telson appears 2,66-times as long as the posterior margin is wide. The anterior pair of spinules, which are o, 14 mm. long, are inserted a little in front of the middle, the posterior pair one and a half as far distant from the posterior margin as from the anterior pair. In the young individual from Banda the proportion between the length of the telson and the width of the posterior margin is 2,56; the arrangement of the spinules, long 0,12 mm., on the upper surface is the same as in the preceding specimen. General distribution: Maldive Archipelago (Coutière) ; Mangarewa, Tearia (Nobili). 115 248 ji7«- Synalpheus Nilandensis Cout. var. bandaensis de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 121. Stat. 49'. April 14. 8°23'.5S., H9°4'.6E. Sapeh-Strait. 70 m. Coral and shells. 1 specimen without large cheliped. Stat. 240. November 22 till December 1. Banda. Lithothamnion-bank in 18 — 36 m. 2 speci- mens, the larger of which with eggs. This variety is especially characterized by the shape of the dactyli of the three posterior legs. The egg-bearing female is 14 mm. long, eggs not numerous, large, ovoid, o,S mm. long. The terminal spine of the scaphocerite, though distinctly longer than the antennular peduncle, does not quite reach to the apex of the carpocerite. In a lateral aspect the upper spine of the basicerite appears almost half as long as the lower, but, when the animal is looked at from above, the upper spine which is directed upward, appears comparatively shorter. Telson 2,83-times as long as the posterior margin is wide, greatest width, anteriorly, 2,1-times as broad as the posterior margin, which resembles that of the type (Coutière, 1. c. Fig. 4^); spinules of the upper surface large, 0,2 mm. long, anterior pair one and a half as far distant from the posterior margin as from the base, posterior pair one-third farther distant from the posterior margin as from the anterior pair. The external maxillipeds extend with two-fifths of their terminal joint beyond the apex of the carpocerite. Merus of large cheliped with a small, acute tooth at the end of the upper margin. The chela resembles that of Syu. neomeris (J. G. de Man, in: Zool. Jahrb. X. Abth. f. Syst. 1897, PI. 35, Fig. 610), but the fmgers are shorter, measuring one-third of the palm. The upper border of the palm of the small chela appears more regularly arcuate than in Coutière' s figure \a. Second legs as in the typical species. The measurements of the third legs agree, with regard to the length of their joints, with those of the typical species; the merus is 3,75-times as long as wide and bears 4 spinules (in the other specimen from Banda the merus bears 5 spinules and the proportion between length and width is 3,65); the propodus appears in the female 6,2-times, in the other specimen 6,5-times as long as broad and is armed with 9 spinules. The dactylus has another form than in the type species. When it is measured, along the anterior margin, from the propodal articulation to the end of the dorsal hook, the dactylus appears 2,5-times as long as broad at its base and it shows therefore a less stout form than in the typical species; the principal claw, though its form is the same as in the latter, is directed obliquely forward, making no right angle with the anterior margin, and the dorsal hook is stronger and measures two-thirds the length of the principal one. Propodus of the fourth legs hardly shorter than the merus, the latter with 2 spinules-, in the typical species the length of the merus is in proportion to that of the propodus as 11 : 10, in this female, however, the propodus is 1,65 mm. long, the merus 1,7 mm. In the other specimen from Banda, long 11,5 mm., the stylocerite reaches to the middle of second antennular article. Thoracic legs as in the female. 116 249 The specimen from Stat. 49a is 10,5 mm. long. The merus of third legs is 3,9-times as long as broad like in the type and the 5 spinules on the distal half are of a somewhat more slender form than in the specimens taken off Banda ; carpus and propodus are also a little more slender, the propodus almost 7-times as long as wide, with 1 1 spinules on the posterior margin and, with regard to the merus, a little longer than in the specimens from Banda; dactylus as in the latter, though 3-times as long as broad at the base. Merus of fourth legs 4-times as long as wide, being even a little shorter than the propodus, the propodus being 1,5 mm. long, the merus 1,45111111.; propodus 7-times as long as wide. Remarks. The variety oxyceros Cout. is related to this one, but the principal claw of the dactylus is less oblique, the lower spine of the basicerite reaches the end of the second antennular article and the terminal spine of the scaphocerite extends far beyond the tip of the carpocerite. f 1 7 b. Synalpheus Nilandensis Cout. var. oxyceros Cout. Synalpheus Nilandensis var. oxyceros H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 871, PI. LXX, Fig. 5, s«. Stat. 282. January 15/17. 8°25'.2S., i27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 egg-bearing female. It is with some doubt that this specimen, which is 9,5 mm. long, is referred to the variety oxyceros. The rostrum reaches to the end of first antennular article, the orbital spines which are directed straightly forward, are half as long ; different from the typical species and from the variety bandaensis, the rostrum and the orbital spines are not curved upward at their tips. Second article of antennular peduncle very slightly more than half as long as the visible part of the first, a little broader than long; third article as long as second. Stylocerite reachino- to the middle of second article. The inferior spine of the basicerite extends to the apex of second antennular article, upper spine hardly longer than the orbital spines. Carpocerite little longer than the antennular peduncle ; the terminal spine of the scaphocerite extends with a little more than one-third of its length beyond the scale and it surpasses the antennular peduncle by the whole length of the third article. Telson 2,5-times as long as the posterior margin is broad, the latter half as- broad as the greatest width; outer angles of the posterior margin spiniform, reaching almost to the middle of the prominent median part. Spinules of the upper surface large, 0,16 mm. long, arranged as in the variety bandaensis. The external maxillipeds project with one-third their terminal joint beyond the carpocerite. The large cheliped resembles that of Syu. neomcris (J. G. de Man, in: Zool. Jahrb. X, Abth. f. Syst. 1897, PI. 35, Fig. 61a), but the palm is unarmed at the distal extremity; the fingers are therefore a little longer than in the variety bandaensis. Second legs as in this variety. The fourth legs (the third are missing) and the fifth also fully accord with those of the variety bandaensis. Merus of fourth legs with 2 sjoinules just beyond the middle, long 0,08 mm., the merus 3,52-times as long as wide; carpus 2,1 7-times as long as thick, propodus a little shorter than the merus, 5, 7-times as long as wide, with 7 spinules. 117 25° The merus of the fourth legs is 2,27-times, the propodus 2,oS-times as long as the carpus. The dactylus much resembles Coutière's figure 5 a, but the principal claw appears comparatively Ie ss thick, only twice as thick at the base as the dorsal claw; it ought, however, to be remarked that Fig. 5^ represents the dactylus of the third legs. Eggs few in number, large, 0,8 mm. long. General distribution: Maldive Archipelago (Coutière). f 18. Synalpheus fossor (Paulson) var. propinqua de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 121. Confer: PAULSON, Recherches sur les Crustacés de la Mer Rouge (en russe), 1875, p. 103, PI. 13, fig. 5; H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 872, PI. VII, fig. 6. Stat. 96. June 27. South-east side of Pearl-bank, Sulu-archipelago. 15 m. Lithothamnion- bottom. 1 ova-bearing female. Stat. 164. August 20. i°42'.5 S., i30°47'.5 E. Near West New Guinea. 32 m. Sand, small stones and shells. 1 male and 1 female. Stat. 273. December 23/26. Anchorage oft" Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 13 m. Sand and shells. 1 young specimen. Stat. 282. January 15/17. 8°25'.2S., I27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 adult, ovigerous female and 2 young specimens. Stat. 315. February 17/18. Anchorage East of Sailus Besar, Paternoster-islands. Depth up to 36 m. Coral and Lithothamnion. 1 male and 1 ova-bearing female. Through the kindness of Professor Coutière two specimens, a male and a female, from Reef Naifaro, Maldives, which in the quoted paper were referred by him to Syn. fossor (Paulson), are lying before me. According to the measurements in Table D, the legs of the third and fourth pairs show, in these two specimens, a somewhat less slender form than in those which were collected by the "Siboga": so e. g. are the meri of the third legs in the female from Naifaro Reef 3-times, in the male 2,875-times as long as wide, whereas in the "Siboga" specimens this proportion varies between 3,38 and 3,61. According to Coutière himself (in: Buil. Soc. Philom. Paris, T. XI, 1908, p. 7) the merus of the third legs should be, in Syn. fossor, 3,55-times as long as wide, just as in the "Siboga" specimens. Like e. g. Syn. Iocasta, also Paulson's species may therefore once prove to belong to those forms in which the measurements are variable with regard to their proportions and this supposition appears the more probable, because in the specimens taken by the "Siboga" the form of the small chela is also variable: this chela, indeed, presents a less slender form in the adult female from Stat. 282 than in the other specimens and resembles almost that of the specimens which were collected at the Reef Naifaro. Both in the semi-adult male and in the adult female from the Naifaro Reef the propodi of the third legs bear five spinules, in the specimens collected by the "Siboga", however, eight or nine, rarely, as in the adult female from Stat. 164, seven spinules and even the slender propodus of the third legs of the young specimen, long 9 mm., from Stat. 273 bears already six spinules, besides those at the distal extremity of the posterior margin. 118 1 now propose to consider the specimens from the Reef Xaifaro as the typical form of Syn. fossor (Paulson), from which the variety propinqua difters by the more si en der shape of the meri and propodi of the three posterior legs and by the larger number of propodal spinules. In other respects the specimens collected by the "Siboga" resemble those from the Reef Xaifaro, except the s m a 1 1 chela, which in the former usually also shows a more slender form, though not as a rule (Table B). I will, finally, add some observations about the "Siboga" specimens. In the adult female from Stat. 96 the rostrum reaches to the middle of the visible part of fïrst antennular article, the lateral spines which are directed straightly forward, are a little shorter, while the tips of the three spines are setose and slightly curved upward. The stylocerite reaches to the 2uJ third part, the lower spine of the basicerite almost to the middle of second antennular article ; the upper spine is slightly directed upward and appears, in a lateral view, almost half as long as the lower. The carpocerite extends bevond the antennular peduncle by somewhat more than the length of third article, the terminal spine of the scaphocerite, thouo-h much shorter than the carpocerite, just extends beyond the antennular peduncle, while the scale hardly surpasses the second antennular article, which is one and a half as long as the third. In the male, not in the female, all the abdominal pleura terminate in a subacute, spini- form tooth; this tooth occurs in the first pleura at the posterior end of the lower margin, in the second a little more forward and in the following- in the middle. In the specimen from Stat. 96 the spinules on the upper surface of the telson are 0,36 mm. long, longer than in the others; in the male from Stat. 164 they are 0,24 mm. long, in the female 0,26 mm.; in the almost adult female from Stat. 282 they are 0,2 mm. long, as long nearly as in the specimens from the Reef Naifaro, in which these spinules measure 0,18 mm. We may therefore conclude that their length is also much variable. In the female from Stat. 96, in the other specimens captured by the "Siboga" and in the male from the Reef Naifaro the posterior margin surpasses but little the spiniform lateral angles, but in the female from that Reef the posterior margin extends much more backward. In the female from Stat. 96 the merus of the large cheliped is twice as long as wide and the upper margin ends in a small, sharp tooth; there is an obtuse tubercle at the distal margin of the palm and another smaller one near the former. In the male from Stat. 164 the merus of the large cheliped is also twice as long as wide, but the fingers are a little longer. In the second legs of the female from Stat. 96 the merus is 5,4-times longer than wide and a little shorter than the carpus, the first segment of the carpus is 4-times as long as thick and a little shorter than the sum of the following; in the female from Reef Xaifaro the merus is only 4,3-times as long as wide and the first carpal segment 3,75-times longer than thick. As regards the following legs I wish to remark that the length of the dactylus of the third legs, measured from the proximal extremity of the anterior border to the extremity of the principal hook, measures in all the specimens one-fifth of the propodus; like the other joints the dactyli are also a little more slender than those of the specimens from the Naifaro Reef and the ventral supernumerary hook is usually a little less prominent than in the species inhabiting the Maldive Archipelago. Eggs moderately numerous, 1 — 1,1 mm. long. 119 252 Table A. Proportion betvveen length of telson and width of the posterior margin Proportion betvveen the greatest width and that of the posterior margin Proportion between length of telson and the distance of the anterior pair of spinules from the posterior margin .... Proportion between the distances of both pairs of spinules from the posterior margin N» i. N» 2. N° 3. N° 4. Ni 5. N° 6. 2,76 2,1 I,6l i.5 2,7 2,6l 2,58 2,64 2,1 2 2,1 2 1,85 I,8l 1,85 i,7 1,64 r,6 1,65 i,54 2,1 1,8 i,57 Table B. Length of the small chela Height of the small chela Proportion between length and height of this chela. Length of the fingers Proportion between the length of this chela and that of the fingers Proportion between length and height of the palm N» 1. NO 2. NO 3. NO 4. No 5. 2,7 2,4 3-35 2,95 3-4 1,06 I 1,05 0,98 1,06 2,55 2,4 3,2 3 3,2 0,9 0,85 1,2 1,1 1,25 3 2,82 2,8 2,68 2,72 i,7 1,55 2 i.9 2 NO 6. 2,68 0,98 2,73 0,95 2,82 1,76 Table C. Relative measurements of the third and fourth legs. Merus Carpus Propodus Merus Carpus Propodus of third legs of fourth legs N« 1. 2,5 I 1,8 U ,3 4 N° 2. NO 3. No 4. NO 5. 2,55 3 2 7"> 2,7 1 I I I i,9 2,12 2,06 2,05 2,34 2,66 2,58 2,66 1 I I 1 1,83 2 2 2,1 No 6. 2,53 I 1,84 2,47 1 i,93 Table D. Length of merus. Width of merus Proportion between length and width of merus. Length of carpus Width of carpus Proportion between length and width of carpus Length of propodus Width of propodus Proportion between length and width of propodus. Length of dactylus Width of dactylus Proportion between length and width of dactylus . NO 1. N« 2. NO 3. NO 4. NO 5. 2,6 2,3 3 2,5 2,7 0,88 0,8 . 0,83 0,74 0,75 1 2,875 3,6i 3,38 3,6 0 ft- 1,05 o,5 0,9 0,42 1 o,47 0,92 0,42 1 0,46 0 2,1 2,1 2,1 2 2 2,2 t-f- CL 5 1,86 5 1,7 9 2,12 s i>9 7 2,05 n" crq 0,42 4.43 o,37 4,6 0,41 5,i 0,38 5 o,39 5,25 o,37 o,34 0,42 o,34 0,36 0,2 0,19 0,19 0,16 0,16 1,85 1,8 2 2 2,1 2 2 No 6. 2,28 0,65 3,5 0,9 o,39 2,3 9 1,66 o,34 4,9 o,33 0,17 1.94 253 Lcngth of merus Width of merus Proportion between length and width of merus. Length of carpus Width of carpus Proportion between length and width of carpus Length of propodus Width of propodus. : Proportion between length and width of propodus. Length of dactylus Width of dactylus Proportion between length and width of dactylus . N» i. N« 2. Ni 3. NO 4. N° 5- 2,16 1,92 2,4 2,o6 2,26 0,72 0,63 0,63 0,58 0,6 3 3 3,81 3,55 3,76 o I-h 0,94 0,82 0,9 o, 8 0,85 r-f- 0,42 0,36 0,4 o,34 0,39 o1 e et 2,2 5 1,64 2,3 4 i,5 2,25 7 1,8 2,1 6 1,6 2,l8 7 1,75 n o>39 o,33 o,35 0,32 0,34 trq in 4,2 4.55 5,i 5 5-i o,35 0,32 0,38 o,33 0,34 0,18 0,16 0,17 0,14 0,16 1.9 2 2,2 2,3 2,1 N» 6. 1,85 0,52 3,5Ö 0,75 0,32 2,34 6 i,45 0,28 5 0,31 0,14 7 1 N° 1 female long 19 mm. and N° 2 male long 12 mm., both from Reef Naifaro; N° 3 adult female long 20 mm. from Stat. 96; N° 4 male long 15 mm. and N° 5 female long 19 mm., from Stat. 164; N° 6 ova-bearing female long 17 mm. from Stat. 282. The numbers above the length of the propodi indicate with how many spinules the posterlor margin of these joints is armed, exclusive those at the distal end. As results from these Tables, the measurements of the female (N° 6) from Stat. 282 are more or less intermediate between those of the specimens from the Reef Naifaro and those of the other specimens collected by the "Siboga". General distribution of the typical species: Red Sea (Paulson); Reef Naifaro (Coutière). f 19. Synalpheus Bakert Cout. var. Stormt n. Alpheus sp., varietas B, J. G. de Man, in: Zoolog. Jahrb. IX. Abth. f. Syst. 1897, p. 741, PI. 35, Fig. 62c and 62cc. Confer: H. Coutière, in: Buil. Soc. Philom. Paris, 1908, p. 9 and in: Proc. U.S. Nat. Museum, 1909, p. 91. Balikpapan, east coast of Borneo, 5 specimens, of which 3 are adult and egg-bearing, collected by Mr. J. W. TisSOT VAN Patot and belonging to the Zoological Museum of the University of Amsterdam. Atjeh, one of the four specimens collected by Captain STORM and described by me in 1897 (1. c.)j this specimen belongs to my private collection. Synalpheus Bakert was founded by Coutière in 1908 on 2 specimens, a male and a female, from South-Adelaide, South Australia; as the above mentioned specimens show some slight differences from Coutière's descriptions, they will here be described as a variety, dedicated to the memory of Captain Storm. The slender, acuminate rostrum, which is 4-times as long as wide at its base, usually reaches to the apex of ist antennular article ; in an adult, egg-bearing female from Balikpapan it does only reach to the distal third of the visible part of the article and in the young specimen from Atjeh it also does not extend to the apex of this article. The lateral spines which are also pointed and acuminate, are one-fourth to one-third shorter than the rostrum and are, like the SIBOGA-EXPEDITIE XXXIX a'. 33 254 rostrum, a little setose at the tips. The three spines are sometimes directed straightly and hori- zontally forward, sometimes they are slightly upturned at the tips, sometimes the lateral spines are a little directed inward and in the male from Atjeh the three spines are moreover slightly turned downward. Visible part of ist antennular article in proportion to the length of the 2nd as 4:3; 2nd article about one and a half as long as thick at the distal extremity and hardly longer than the 3rd. The visible part of ist article appears but a little shorter than the 2nd and the 3ld taken together. The stylocerite reaches to the middle or to the distal 3ld part of median article. Lower spine of basicerite nearly as long as the basal part, not longer, reaching to the extremity of ist antennular article or just beyond it; spine at the upper angle well-developed, in the adult specimens distinctly shorter than the lateral frontal spines, but in the young specimen from Atjeh reaching as far forward as these spines. Like in the typical Syu. Bakert, the carpocerite, measured at the lower side, appears 3,6-times as long as wide and surpasses the antennular peduncle only with one-fourth or one-fifth the 3vd article. While in the typical species the terminal spine of the scaphocerite extends beyond the carpocerite, in the variety Stormt the terminal spine is as long as the carpocerite or sometimes even slightly shorter ; scale reaching to the middle or to the distal third part of 3rd antennular article. Merus of both chelipeds with a spine at the apex of the upper margin, the two other margins unarmed. In the young specimen from Atjeh the measurements of the large chela are : fingers 1 ; total length $,7; height 1,35; proportion between length and height 2,75. The palm terminates in a small, conical tooth. Fingers of the smaller chela a little shorter than the palm. The measurements of the 2nd legs are indicated in Table B, those of the specimens from Balikpapan generally agree with those of the specimens from Atjeh, while the carpal segments are a little more slender, the older the specimens are; I will, however, remark that in the adult specimens from Balikpapan the chela is not longer, but a little shorter than the sum of the three last carpal segments and that in these individuals the 5th segment appears a little longer than the palm. For the measurements of the 3rd legs see Table C. They apparently prove that the merus and the propodus are longer in proportion to the palm, the older the specimens are. Whereas in the typical Bakert the merus is 3,5-times as long as wide, in this variety the ratio is as 4 : 1. In the young specimen from Atjeh the propodi bear 5 spinules long 0,17 — 0,19 mm., besides 2 at the distal extremity, in the specimens from the East coast of Borneo, however, 7 spinules long 0,27 mm., besides the 2 apical spines. Measured from the proximal extremity of the anterior margin to the end of the principal hook the dactylus proves, in the young specimen from Atjeh, to be 0,5 mm. long, one-fourth the length of the propodus, and to be 3-times as long as wide at its base, near the propodal articulation. The principal hook, which is twice as long as thick at its base, makes an obtuse angle with the longitudinal axis of the dactylus and is separated by a semicircular curve from the ventral hook, which runs parallel with the principal ; the ventral hook is very small and measures, as in the typical species, hardly one-fourth the length of the principal. The dorsal hook is as long as the latter, but only half as thick at its base and the notch between both hooks is sharp. 255 As is shown in Table A, the telson appears in older specimens a little wider anteriorly with regard to the posterior margin than in the younger ones. The posterior margin is semi- circular, rather prominent, the outer angles are spiniform, in adult specimens almost half as long as the length of the posterior margin, measured in the middle line, but in younger individuals the outer angles are shorter. In the adult individuals the spinules of the upper surface are 0,32 mm. long, one-eighth the length of the telson, in the young specimen from Atjeh they are comparatively shorter, measuring one-eleventh the length of the telson. In all the specimens the distances of both pairs of spinules from the posterior margin are in proportion to one another like 5:3. Table A. Length of the telson Width at the base W'idth of the posterior margin Proportion between the length of the telson and the width of the posterior margin . Proportion between the width at the base and that of the posterior margin. . . . Proportion between the length of the telson and the distance of the anterior pair of spinules from the posterior margin Proportion between the distances of both pairs from the posterior margin .... Table B. Measurements of 2nd legs in millimeters. No 3. N' I. NO 3 2,7 mm. 2,34 mm. 1,22 mm. 2,21 2,2 i,9 1.7 1,66 L7 1-7 Length of the merus Width of the merus Proportion between length and width Length of ist carpal segment . . . Width of this segment at the far end Proportion between length and width Length of 2nd segment Width of 2nd segment Length of 3rd segment Width of y<$ segment Length of 4th segment Width of 4*h segment Length of 5th segment Width of 5th segment Length of the chela Length of the palm Length of the fingers N° 1. No 2. 3,1 2 2 0,55 0,4 5-6 5.5 1,96 i.3 0,4 0,28 4.9 4,6 o,39 0,26 0,41 0,295 0,44 0,28 0,42 0,295 o,39 o,3 0,42 0,31 0,84 0,6 o,44 0,32 1,52 1,2 0,68 o,5 0,84 o,7 0.35 5.7 1,18 0,28 4.2 0,22 0,28 0,24 0,22 0,5 1,04 o,47 o,57 Table C. ! Merus Carpus Propodus Proportion between length and width of the merus Proportion between length and width of the propodus N° 1 adult egg-bearing female, long 21 mm., from Balikpapan; Nu 2 younger specimen, long 14 mm. from the same locality; Nu 3 specimen, without eggs, long 11 mm. from Atjeh. 123 N° 1. No 2. 2,5 2,45 I I 2,43 2,36 4 4 6,5 6,66 N» 3. 2,3 I 2,1 4 7 256 The adult, egg-bearing specimens from Balikpapan are 20 and 21 mm. long, the egg- bearing specimen from Atjeh, described in 1897, was only 11 mm. long. 7 20. Synalpkeus Hcroni Cout. Synalpheus heroni H. Coutière, in: Proc. U.S. National Museum, XXXVI, 1909, p. 42. Stat. 58. April 25. Anchorage off Seba, Savu, Reef. 1 ova-bearing and 1 younger female. Stat. 66. May 7/8. Bank between islands of Bahuluwang and Tambolungan, south of Saleyer. 8 to 10 m. Dead coral; Halimeda; Lithothamnion. 1 male. The three specimens are very well in accordance with the description. The rostrum in the specimen from Stat. 66 is tvvice as long as broad at base and reaches to the middle of the visible part of first antennular article; lateral spines rather obtuse, slightly shorter than the rostrum and as long as wide at their base, the three frontal spines are setose at their tips, not curved upward, but directed downward. Second antennular article one and a half as long as thick distally, a little shorter than the visible part of the first, third a little shorter than second; stylocerite extending, at the right side, to the 2nd third part, at the left almost to the middle of second article. Lower spine of basicerite longer than the stylocerite, but not yet reaching the extremity of median antennular article, upper spine turned upward and measuring, in a lateral view, one-third of the lower. The carpocerite extends by the whole length of third article beyond the tip of the antennular peduncle, lateral spine of scaphocerite a little shorter than the carpocerite, though much longer than the antennular peduncle; antennal scale reduced, reaching to the apex of median antennular article. In the ova-bearing female from Stat. 58 the rostrum reaches almost the end of first antennular article while the lateral spines only extend to the middle of its visible part ; the stylocerite extends to the distal third part, the lower spine of the basicerite, however, to the end of second article, whereas the upper spine appears a little shorter than in the other specimen. The carpocerite is a little shorter than in the male from Stat. 66, the terminal spine of the scaphocerite therefore as much surpasses the carpocerite as in Coutière's specimens and the scale likewise somewhat extends beyond the second antennular article. The other specimen from Stat. 58 resembles the female, but the terminal spine of the scaphocerite is as long as the carpocerite and the frontal spines agree with those of the specimen from Stat. 66. The three specimens therefore prove that also this species is somewhat variable as regards the length of the rostrum, the stylocerite, the carpocerite and the spines of the basicerite. Telson of the specimen from Stat. 66 2,86-times as long as the posterior margin is broad, greatest width twice as broad as the posterior margin ; the latter very prominent, its outer angles acute, very short. Spinules of upper surface 0,14 — o, 16 mm. long, rather far distant from the lateral margins ; proportion between the length of the telson and the distance of the anterior pair from the posterior margin 1,95, the anterior pair situated immediately in front of the middle; proportion between the distances of both pairs from the posterior margin 1,7. Upper margin of the merus of large cheliped truncate, unarmed. In the specimen from Stat. 66 the relative measurements of the large chela are the following: fingers i; total length 3,15; height 1,25. These numbers closely agree with those mentioned by Coutière: i : 3,2; 1,32. 124 257 There is an obtuse tubercle at the distal extremity of the palm-, the im mobile finger bears at the base on the outer side a conical tubercle and a much smaller obtuse tubercle in the middle, and between both tubercles the finger appears distinctly concave, while the inner side of the finger is also excavate or furrowed on its proximal half. In the same specimen from Stat. 66 the relative measurements of the small chela are: fingers i; total length 2,7; height 1,1. The large chela is 2,6-times as long as the other, according to Coutière 2,45-times. In the specimen from Stat. 66 as also in the ova-bearing female from Stat. 58 the merus of second legs is 5-times as long as wide. In the specimen taken at the Station 66 the first segment is 4,8-times longer than thick and a little longer than the sum of the following. in the female the proportion is 4,4 and the first segment appears as long as the sum of the following. Synalpheus Heroni is mainly characterized by the shape of the three posterior legs and of their dactyli. In the specimen from Stat. 66 the propor'cions of the third pair are: carpus i; merus 1,82; propodus 1,47, those of the fourth pair are: carpus i; merus 1,84; propodus 1,47. Merus of third legs 2,32-times longer than wide, propodus 3,86-times, the latter with 7 strong propodal spinules, 0,2 — 0,22 mm. long, besides those at the clistal extremity. The length of the dactylus, taken from the proximal extremity to that of the principal hook, is almost one-third the length of the propodus; the dactylus is just half as broad at its base as it is long, the principal hook, which is twice as long as thick at its base, is regularly curved downward and makes an acute angle with the dorsal hook which is hardly shorter, but half as thick at its base ; the third, ventral, prominence, finally, is acute and well marked. The merus of fourth legs, one-tenth shorter than that of the third, is 2, 5-times longer than wide, the propodus 3,8-times and armed with 6 spinules that are 0,21 mm. long, besides those at the distal extremity; dactylus similar to that of the third legs. These legs are slightly setose. Eggs not numerous, 0,7 — 0,75 mm. long. In the ova-bearing female from Stat. 58 the fingers of the large chela are of a verdigris colour, the palm yellow. This female is 1 1,5 mm. long, the specimen from Stat. 66 has the same size. General distribution: Djibouti (Coutière). f 2 1 . Synalpheus Demani Borr. Alplieus triunguiculatus J. G. de Man, in: Archiv für Naturg. 53. Jahrg. 1888, p. 504, PI. XXII, fig. 1 (Nee PAULSON). Synalpheus demani L. A. Borradaile, in : A. Willey's Zoological Results. Part IV. Cambridge University Press, September 1899, p. 416. Synalpheus Brockü G. Nobili, in: Annuario del Museo Zoologico di Napoli, Vol. I, N° 3, 1901, p. 2. Stat. 33. March 24/26. Bay of Pidjot, Lombok. 22 m. and less. Mud, coral and coralsand. 1 male. Stat. 164. August 20. i°42'.5 S., I30°47'.5 E. Between Misool and New Guinea. 32 m. Sand, small stones and shells. 1 male and 1 fully adult, ova-bearing female. Stat. 315. February 17/18. Anchorage East of Sailus Besar, Paternoster-islands. Depth up to 36 m. Coral and Lithothamnion. 1 male and 1 ova-bearing female. The female from Stat. 164 is 30 mm. long, larger than those previously described. I25 ^53 Frontal region, antennal and antennular peduncles fully according with Fig. i of my quoted paper but the stylocerite reaches to the middle of the second article of the antennular peduncle and, though the carpocerite appears, as in that figure, a little longer than the antennular peduncle, the latter reaches just as far forward as the terminal spine of the scaphocerite. Telson 3,55 mm. long, 2,6-times as long as the posterior margin is broad (1,36 mm.), greatest width anteriorly 2,1-times that of the posterior margin; there is no tracé at all of the anterior pair of spinules, but quite rudimentary spinules of the posterior pair, only 0,08 mm. long, are present; they are situated close to the lateral margins, their distance from the posterior margin is one- fourth the length of the telson. In my description of 1888 the ventral hook of the dactylus of the third legs is said to be half as long as the principal hook, but in this adult specimen it measures two-thirds of the latter. The male from this Station is 21 mm. long. The rostrum reaches nearly to the end of first antennular article, the orbital spines are a little shorter; the stylocerite extends almost to the middle of second article. The terminal spine of the scaphocerite reaches as far forward as the antennular peduncle and is a little shorter than the carpocerite ; lower spine of basicerite as long as first antennular article. Telson 3,25-times as long (2,86 mm.) as its posterior margin is broad (o, 88 mm.), the width at base 2,55-times that of the posterior margin; in this specimen traces of the anterior pair of spinules are also visible, situated about as far from the posterior pair as the latter from the posterior margin. The male from Stat. 315 is 15 mm. long. The length of the telson equals just 3-times its distal margin, while the width at the base is 2,35-times as broad as the posterior margin. The rostrum reaches the end of first antennular article, orbital spines a little shorter. Stylocerite not yet attaining the middle of second article. Dactyli of the third to fifth legs as in the preceding specimens. The female from this Station is 21 mm. long. Rostrum, orbital spines and the peduncles with the scaphocerite as in the male but the stylocerite reaches to the distal third of second antennular article. The telson presents the same form as in the male. Posterior pair of spinules on the upper surface visible, though rudimentary. Eggs not very numerous, those of the female from Stat. 164 1 mm. long, those of the female from Stat. 315 0,7 mm. long. General distribution: Amboina (de Man); Lifu, Loyalty Islands (Borradaile). III. Patdsoni group. f22. Synalphetis tumidomanus (Paulson). Alplieus tumidomanus Paulson, Recherches sur les Crustacés de la mer Rouge, (en russe). Kiew, 1875, p. 101, PI. XIII, fig. 2. Alpheus tumidomanus H. Coutière, in: Proc. U.S. Nat. Museum, XXXVI, 1909, p. 24, fig. 5. Stat. 209. September 23. South point of Kabaëna-island. Reef. 1 female with eggs. Stat. 282. January 15/17. S°25'.2S., 127°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 specimen without eggs. It is with some doubt that these specimens are referred to Paulson's species, because they do not fully accord with one another and because the eggs are not "very large", as they are described by Coutière (1. c). 126 259 The rostrum of the specimen, long 10,5 mm., from Stat. 282 is si en der, 7,5-times as long as wide in the middle and extends to the end of first antennular article; lateral spines also pointed, slender, one-fourth shorter than the rostrum, presenting the same form as those of Syn. acantliitclsonis (H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, PI. LXXII, Fig. 13'), but otherwise as in the quoted figure of Syn. tumidomanus in the " Proceedings of the U. S. National Museum". Antennular peduncle 5-times as long as thick at the apex of the second article; the length of the visible part of the first article and that of the two following are in proportion to one- another as 10 : 7 : 6; the second article is 1,4-times as long as thick at its distal end. As regards the stylocerite and the antennal peduncle with scaphocerite and spines, this specimen resembles the Fig. 5 in the "Proceedings". Carpocerite 4,55-tirnes as long as wide in the middle; in a lateral view the spine at the upper angle of the basicerite proves to measure one-third the length of the lateral or lower spine. Unfortunately Prof. Coutière does not mention the measurements of the telson and of the legs of Syn. tumidomamis, so that it is impossible to decide whether they agree with this specimen or not. The outer angles of the posterior margin of the telson are acute, spini- form, but they are a little shorter than in the quoted figure. The arrangement of the spinules of the upper surface is otherwise than in Syn. ThcopJiane. These spinules are namely inserted much nearer to the lateral margins, the anterior pair a little before the middle; the distance between the spinules of the anterior pair, the distance between those of the posterior and the distance between the two pairs are in proportion to one another as 10:7:5, the spinules of the anterior pair are comparatively farther distant from one another than in Syn. Theopha.7ie. Merus of large cheliped 2,1-times longer than wide, upper margin with a spiniform tooth at the apex. Relative dimensions of large chela: fingers i; total length 4,75; height 1,7, this chela being 2,8-times longer than high. The fingers are much shorter with regard to the total length than in the species from the Persian Gulf which was referred by Nobili to Syn. tumidomanus, in: Buil. Scientif. de la France et de la Belgique, XL, 1906, p. 27. The anterior margin of the palm is almost unarmed, presenting only a small, obtuse tubercle. The small cheliped and the 2nd legs are missing. For the measurements of the third and fourth legs I refer to the Tables B and C. In both legs the propodus bears 8 spinules; those of the third legs are 0,15 — 0,16 mm. long, those of the fourth are a little shorter. Measured from the base of the anterior margin to the tip of the ventral hook, the dactylus proves to measure one-fifth the length of the propodus, but it shows another form than that of Syn. Theophane. The dactylus, indeed, has a less slender form, being in the third legs 2,6-times, in the fourth 2, 5-times as long as broad ; the ventral hook, the length of which is in proportion to the width at its base as 5:3, does not directly continue the posterior margin of the dactylus, but rejoins it by a concave curve of short radius and the arcuate, anterior margin of this hook runs nearly perpen di cu lar ly to the posterior margin of the dactylus; the dorsal hook is a little less broad at its base, but one-fifth longer than the other, the two hooks are divergent, but the narrow, inner angle of the notch is rounded, concave. In the other specimen which is 13,5 mm. long, the three frontal spines closely 127 2ÓO resemble those of the figure in the "Proceedings"; the rostrum, 6-times as long as wide in the middle, extends to the distal fourth of the visible part of basal antennular article and the orbital spines are but one-eighth shorter than the rostrum. The carpocerite is perhaps a little less slender than in the other specimen, the two are not equal, the right carpocerite being 4- times, the other 4,4-times as long as wide in the middle; for the rest the antennal region accords with that of the specimen from Stat. 282. The telson fully resembles that of the other specimen. The first pair of legs are missing. Merus of second legs 4,8-times as long as wide; first segment (1,095 rnm.) of the carpus not slender, 3,75-times as long as thick distally, hardly shorter than the sum (1,168 mm.) of the four following, the proportion being 1,07; chela 1,022 mm. long, slightly shorter than the first segment; the fingers in proportion to the palm as 4:3. The following legs show a s o m e w h a t stouter form than those of the specimen from Stat. 282 and the propodus of the third pair bears only 6 spinules, instead of 8, but of the same length; those of the fourth pair 7. The dactyli of the third legs are 2,4-times as long as wide at the base and measure about one-fifth the length of the propodus ; the ventral hook is just one and a half as long as wide at base, the dorsal hook is almost twice as long as the other and a little less broad at its base, but for the rest the form of the dactyli is the same Ova rather numerous, 0,73 mm. long. The slight differences between both specimens are probably of a local or individual character. Table A. Proportion between length of telson and width of the posterior margin Proportion between the greatest width and that of the posterior margin Proportion between the length of the telson and the distance of the anterior pair of spinules from the posterior margin Proportion between the distances of both pairs of spinules from the posterior margin . Table B. ( Merus Relative dimensions of < Carpus \ Propodus Proportion between the length of the merus and that of the propodus Proportion between the length and the width of the merus .... Proportion between the length and the width of the propodus . . Table C. ( Merus Relative dimensions of l Carpus ' Propodus Proportion between the length of the merus and that of the propodus Proportion between the length and the width of the merus .... Proportion between the length and the width of the propodus . . . N° 1 female from Stat. 209; N° 2 specimen from Stat. 282. General distribution: Red Sea (Paulson). 12S No 1. 2,52 2 1,84 1,85 N° 2. 2,5 1.95 1,92 1,8 N« 1. No 2. 2,21 2,45 I I of the third less 2,1 1,07 2 22 1,1 3-65 4,2 l 5,58 6,4 No 1. N» 2. 2,01 2,34 I i of the fourth legs 2,06 I 2,3 1,02 3fi 4.1 5,56 6,45 2ÓI f23. Synalpkeus Thcophane de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 292. Stat. 78. June 10/11. Lumu-Lumu-shoal, Borneo-bank. Reef. 1 egg-bearing female. Stat. 144. August7/9. Anchorage north of Salomakiëe-(Damar-)island. Reef. 1 egg-bearing female. Stat. 282. January 15/17. 8°25'.2S., 127° 18.4 E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 3 specimens, 2 of which with eggs. A new species of the Paulsoni group, closely related to Syn. tumidomanus (Paulson) and to Syn. hululensis Cout. Rostrum in the female from Stat. 78 3-times as long as wide at its base, reaching but a little beyond the middle of the visible part of first antennular article, of an elongate triangular form ; lateral spines acuminate, but a little shorter than the rostrum, from which they are separated by notches, similar to those of Syn. tumidomanus (vide: Coutière in: Proc. U. S. Nat. Mus. XXXVI, 1909, p. 24, Fig. 5). In the female from Stat. 144, long 11,5 mm., the rostrum appears a little more slender, almost 4-times as long as wide at its base and it reaches to the distal fifth of the visible part of first antennular article ; the orbital spines are compara- tively much shorter than in the preceding specimen, being one-fourth shorter than the rostrum. In the largest specimen from Stat. 282, a female with eggs, 13,5 mm. long, the rostrum is 4-times as long as wide at its base and reaches almost to the end of basal article, while the lateral spines hardly reach beyond the middle. The three spines project straightly forward and are not curved upward at their tips. Antennular peduncle 4-times as long as wide (at the distal extremity of the second article) ; median article a little longer than wide distally and a little more than half as long as the visible part of basal article; third article as long or hardly shorter than second. The length of the visible part of first article and that of the two following are in the proportion as 5 : 3 : 3. In the quoted figure of Syn. tumidomanus (Paulson) the third article appears distinctly shorter than the second, but the second hardly shorter than the visible part of the first. The stylocerite extends to the distal third of median article. Carpocerite resembling that of Syn. tumidomanus and Syn. huhilensis, 4,3 — 4,5-times as long as wide and surpassing the antennular peduncle by one-third the distal article. Terminal spine of scaphocerite not or hardly curved inward, always reaching for a short distance beyond the carpocerite and projecting by one- third of its length beyond the apex of the antennal scale which almost reaches to the tip of the antennular peduncle. Lateral spine of the basicerite a little longer than the outer margin of the basal part, clearly shorter than the stylocerite, and reaching only to the 2nd fourth part of median antennular article ; upper angle with a well developed spine, which is directed obliquely upward, its length being one-fourth the length of the lateral or inferior spine. The measurements of the telson are indicated in Table A. The posterior margin is more prominent than in Syn. tumidomanus, almost se micir cular, the outer angles are spiniform, as in this species, but shorter, only half as long as the outer spinules of the posterior margin; the longer, inner spinules of the posterior margin are just half as long as the distance between the spiniform, outer angles. Ouite characteristic is the arrangement of the spinules on the upper surface, that are of moderate length, those of the anterior pair 0,175 mm. long, those of the 129 SIBOGA-EXPEDITIE XXXIX a'. 34 2Ó2 posterior o, 19 mm.; the anterior pair is situated before the middle, about one and a half as far distant from the posterior margin as from the base, the posterior pair just as far distant from the distal extremity of the telson as the distance between the postero-lateral spiniform angles is wide. According to the quoted figure of Syn. tumidomanus, however, in this species the posterior pair is situated much more backward, its distance from the posterior extremity being only half as long as the width of the posterior margin. The two pairs of spinules are rather far distant from the lateral margins and the spinules of the anterior pair are but a little farther distant from one another than those of the posterior, the distance between the two anterior spinules being in proportion to the distance between the posterior as 6:5; the distance, finally, between the two anterior spinules is in proportion to the distance between the two pairs as 7:4. The four spinules appear therefore to be inserted at the angles almost of a rectangle. The large cheliped is missing in all the specimens. Merus of small cheliped 2,54-times as long as wide, upper margin terminating in a small, spiniform tooth. Relative dimensions of the small chela: fingers 1 ; total length 3,2; height 1,1. The fingers are comparatively shorter than those of the small chela of Syn. hululensis. Merus of second legs 5,3-times longer than wide; first segment of the carpus 5,6-times longer than thick at its distal extremity, clearly longer than the sum of the four following, viz. 1,23-times; chela as long as the carpus, exclusive the first segment, fingers one-fifth longer than the palm. For the measurements of third pair I refer to the Table B : these legs apparently much resemble those of Syn. hululensis Cout. In the specimens from the Stations 144 and 282 the propodus bears ten spinules, in that from Stat. 78 eight; these spinules are o, 15 — o, 1 9 mm. long. The dactylus, similar to that of Syn. hululensis, appears, when measured from the proximal end of the anterior margin to the extremity of the ventral hook, to be 3-times as long as wide at its base and measures one-fifth the propodus; the dorsal hook is twice or almost twice as long as the ventral and only very slightly broader at its base, while the notch between both hooks is rounded internally. Eggs rather numerous, 0,75 — 0,8 mm. long. The largest specimens, egg-bearing females, are 13,5 mm. long, but one of the egg-bearing females from Stat. 282 measures only 9,5 mm. Table A. Proportion between length of telson and width of the posterior margin Proportion between the greatest width and that of the posterior margin Proportion between length of telson and the distance of the anterior pair of spinules from the posterior margin Proportion between the distances of both pairs of spinules from the posterior margin Table B. I Merus Carpus Propodus Proportion between the length of the merus and that of the propodus Proportion between length and width of the merus Proportion between length and width of the propodus . . . . 130 of the third legs No 1. N° 2. N« 3- 2,6 2,85 2,7 i>9 2 i>9 i.7 1,8 1,63 i,5 1 1,6 1,58 <° 1. No 2. N« 3. =,34 2,4 2,38 1 I I 2,1 2 2 2,1 1,1 1,1 1,1 4 4,2 4,6 6,2 6,6 6,4 '63 f 24. Synalpheus Jiastilicrassus Cout. Synalpheus liastilicrassus H. Coutière, Alpheida; Mald. and Laccad. Archip. 1905, p. 875, PI. LXXII, fig. 12. Stat. 91. June 22. Muaras-reef, inner side; near east coast of Borneo. 2 specimens without chelipeds, one of which with eggs. Stat. 115. July 9/1 1. East side of Pajunga Island, Kvvandang-bay. Reef. 1 female with eggs. Stat. 164. August. 20. i°42'.5 S., I30°47'.5 E. Between Misool and New-Guinea. 32 m. Sand, small stones and shells. 1 young specimen. Stat. 250. December 6jy. Kur-island. 27 m. Coral and Lithothamnion. 1 young specimen. Stat. 260. December 16 and iS. 5°36'.5 S., i32°55'.2E. 2,3 miles N., 630 W. from the North point of Nuhu Jaan, Kei-islands. 90 m. Sand, coral and shells. 1 ova-bearing female. Stat. 282. January 15/17. 8°25'.2S., I27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 male and 2 young specimens. Stat. 285. January 18. 8°39'.iS., I27°4'.4E. Anchorage South coast of Timor. 34 m. Litho- thamnion. 1 ova-bearing female. Stat. 299. January 27/29. io°52'.4S., I23°i'.iE. Buka- or Cyrus-bay, South-coast of Rotti- island. Depth up to 36 m. Coral and Lithothamnion. 1 specimen, with a parasite between the pleopods. The specimens from Stat. 282 fully agree with the description and with the figures ot Coutière. The largest specimen is a male, long 10 mm. Antennal region as in Fig. 12, but the orbital spines project straightly forward. Telson resembling Fig. 12 d, just twice as long as the distance between the postero-lateral spines, proportion between that distance and the greatest width 1,7. Spinules of the anterior pair 0,19 mm. long, those of the posterior 0,23 mm.; the anterior pair before the middle, proportion between the length of the telson and the distance of the anterior pair from the posterior margin 1,55, proportion between the distances of both pairs from the posterior margin 1,6. The postero-lateral spines are barely longer than the median part of the posterior margin and the long, inner spinules are hardly more than half as long as the distance between the spiniform outer angles. Merus of large cheliped 2,1-times, that of the smaller just 3-times longer than wide and in either of them the upper margin is obtuse, unarmed at apex. Relative proportions of the large chela: fmgers i; total length 4,2; height 1,5. This chela is 3-times as long as the other, the relative dimensions of which are: fingers i; total length 3,1; height 1,12. Merus of second legs 6-times as long as wide. The flrst carpal segment, 4,8-times longer than thick, is a little longer than the sum of the four following that, taken together, appear as long as the chela; the second article is a little longer than the third or the fourth that are equal, fingers somewhat more than one and a half as long as the palm. Relative dimensions of the third legs: merus 2,72; carpus t; propodus 2,1. Merus 4,1- times longer than wide and 1,27-times longer than the propodus which is slender, 6-times as long as wide and armed with 1 1 spinules, that are o, 1 mm. long. Dactylus one-sixth the length of the propodus, 2,5-times longer than wide, when measured to the extremity of the ventral hook; ventral hook one-fifth the whole length of the dactylus, dorsal hook but a little longer and thicker than the other. The ova-bearing female from Stat. 115, long 10,5 mm., does not fully agree with the 131 264 preceding specimen as regards the measurements, but the differences are perhaps of a local character. The ova, few in number, are large, i mm. long. The stylocerite does not surpass the basal antennular article and appears therefore a little shorter than the lower spine of the basicerite. Telson longer, its length equals 2,5-times the distance between the postero-lateral spines and this distance is just half as large as the greatest width; the arrangement of the spinules is the same. Merus of small cheliped 3-times longer than wide, its upper margin, like that of the large cheliped, acute at apex, though a proper tooth is not developed. Relative dimensions of small chela : fingers i; total length 2,9; height 0,93. Second legs stouter than in the preceding specimen. Merus 5,2-times longer than wide. First carpal segment 3,57-times longer than thick, a little shorter than the sum of the four following, which, taken together, are a little shorter than the chela; the 2nd segment is slightly longer than the 3ld or the 4th that are equal, fingers hardly one and a half as long as the palm. The relative dimensions of the third legs are: merus 2,7; carpus i; propodus 2. Merus 4,4-times longer than wide and 1,35-times as long as the propodus-, the latter is 5,7-times longer than wide and armed with 11 spinules, long 0,1 mm. Dactylus somewhat more than one-fifth of the propodus and 2,76-times longer than wide; dorsal hook one and a half as long and a little broader at the base than the other. In most specimens of the other stations the large cheliped is missing. Remarks. This species is apparently closely related to Syn. acanthitelsonis and one should be inclined to consider it as a variety, especially because in some individuals of Syn. acanthitelsonis from Stat. 273 the upper angle of the basicerite is unarmed, while in other specimens, referred to Syn. hastilicrassus, the upper margin of the merus of both chelipeds is often acute, as e. g. in the female which has been described. The form of the telson is also variable. General distribution: Maldive and Laccadive Archipelagoes. 724^. Synalpheus liastilicrassus Cout. var.? Stat. 305. February 8. Mid-channel in Solor-strait off Kampong Menanga. 113 m. Bottom stony. 1 specimen, young. Stat. 310. February 12. 8° 30' S., H9°7'.5 E. Sapeh Strait. 73 ra. Sand with few pieces of dead coral. 4 specimens, 1 of which with eggs. The specimen from Stat. 305, which is 8 mm. long, probably also belongs to Syn. liastili- crassus^ but it is here described separately, on account of the form of the large chela. In the male of Syn. Jiastilicrassns from Stat. 282 the relative dimensions of the large chela are: fingers i; total length 4,2; height 1,5. In the specimen from Stat. 305, however, the dimensions are: fingers i; total length 2,9; height 0,96. The fingers are, in this specimen, not only much longer with regard to the length of the chela, but they show a more slender form than in the specimens referred to Syn. liastilicrassus. There is a subacute tubercle on the anterior margin of the palm. 132 265 The frontal and the antennal regions are typical and the measurements of the telson agree with those of the female from Stat. 115 (p. 264). Merus of second legs 6-times longer than wide as in the male from Stat. 282, but the first segment of the carpus, which is almost as long as the sum of the four following and as long as the chela, is 4-times longer than thick. Relative dimensions of third legs: merus 2,8; carpus 1 ; propodus 2,3. Merus 4,5-times longer than wide, propodus 7-times, the latter with 9 spinules, long 0,066 — 0,1 17 mm. The dactylus that measures somewhat more than one-sixth of the propodus, has a more slender shape than in the typical specimen from Stat. 282, being 2,9-times longer than wide; the ventral hook measures one-sixth the length of the dactylus, the dorsal hook is one and a half as long as the other and almost one and a half as broad at its base, while the angle between both hooks, which in the typical male from Stat. 282 is rounded, appears in this specimen rather sharp. The large chela of a specimen long 10 mm. from Stat. 310 shows the following dimensions : fingers i; total length 3,45; height 1,13; these dimensions are intermediate between those of the specimen from Stat. 305 and those of the typical male from Stat. 282. Second legs as in the specimen from Stat. 305, but the first segment of the carpus is 4, 4-times longer than thick: an intermediate number again. Relative dimensions of the third legs: merus 2,74; carpus i; propodus 2,3. Merus 4,2- times longer than wide, propodus 6,5-times; dactylus like in the specimen from Stat. 305, but the dorsal hook is hardly broader at its base than the other. f25. Synalpheus acanthitelsonis Cout. Synalpheus acanthitelsonis H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 875, PI. LXXII, fig. 13. Stat. 164. August 20. i°42'.5 S., I30°47'.5E. Between Misool and New Guinea. 32 m. Sand, small stones and shells. 7 specimens, none of which with eggs. Stat. 273. December 23 26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 13 m. Sand and shells. 4 specimens, 3 of which with eggs. These specimens agree very well with the original description. In one of the specimens from Stat. 164, which is 11,5 mm. long, while the others are nearly of the same size, the frontal spines and the antennal region agree with Fig. 13' (Coutière, 1. c), but the orbital spines, though their form is the same, are directed inward, as in Fig. 13. The slender rostrum, 5-times as long as wide, reaches the middle of median antennular article; the visible part of first article is one and a half as long as the second and the second a little longer than the third; the stylocerite extends to the 2nd third part of median article. The lower spine of the basicerite is as long as the first article and the scale of the scaphocerite reaches to the middle of third article. Telson 2,1-times longer than the distance between the outer spiniform angles of the posterior margin is broad; this margin agrees with Fig. 13c (1. c), but the inner spinules are 0,32 mm. long, much longer than the spiniform angles, whereas in the original description the latter are described as being longer than those spinules. Proportion between the greatest width and the distance between the postero-lateral spiniform angles 1,86. The spinules of the 266 upper surface are large, 0,25 mm. long; the anterior pair is situated before the middle, proportion between the length of the telson and the distance of the anterior pair from the posterior margin 1,64, proportion between the distances of either pair from the posterior margin 1,83. Merus of the small cheliped (the other is missing) 2,8-times as long as wide, with a small acute tooth at the apex of the upper margin as in Fig. 13^; the small chela shows the following dimensions : fingers i; total length 3,1; height 1,04. Merus of second legs 6-times longer than wide. First carpal segment 5-times longer than thick, a little longer than the sum of the following, the three following segments equal ; chela a little shorter than the sum of the 2nd — 5* segments, fingers one and a half as long as the palm. The relative dimensions of the third legs are: merus 2,66; carpus i; propodus 2,34. Proportion between the length of the merus and that of the propodus 1,14. Merus 4,55-times, propodus 6,3-times longer than wide, the propodus slender, slightly narrowing distally and armed with 11 rather short spinules, that are 0,1 — 0,116 mm. long. Measured from the proximal extremity of the anterior margin to the extremity of the ventral hook, the dactylus proves to measure almost one-fifth of the propodus and it much resembles that of Syn. hastilicrassus, but the dorsal hook is one and a half as long and a little less thick at its base than the ventral hook. These legs are slightly setose. In other specimens from this station the frontal spines more closely resemble Fig. 1 3 of the original description, but in all these specimens the internal spinules of the posterior margin of the telson are much longer than the spiniform external angles. One of the females from Stat. 273 is 11 mm. long; ova small, 0,66 — 0,73111111. long. The rostrum is slender, reaching almost to the middle of median antennular article ; lateral spines and antennal region as in Fig. 13', (1. c). Telson 2,3-times longer than the distance between the spiniform outer angles of the posterior margin, proportion between this distance and the greatest width 1,8; the internal spinules of the posterior margin are considerably longer than the spiniform angles. The spinules of the upper surface are 0,25 mm. long, pro- portion between the length of the telson and the distance of the anterior pair from the posterior margin 1,7; proportion between the distances of either pair from the posterior margin 1,6. Merus of large cheliped twice as long as wide, with a spiniform tooth at the apex of the upper margin as in Fig. i^a. Proportions of the large chela: fingers i; total length 3,6; height 1,3. Proportion between the length of the large chela and that of the smaller 2,46. Merus of small cheliped 2,5 6-times longer than wide, with an acute tooth at the apex of the upper margin; proportions of the small chela: fingers i; total length 2,8; height 0,94. Second legs as in the preceding specimen, but the merus is 6,4-times longer than wide and the second segment is a little smaller than the third or the fourth which are equal. The proportions of the third pair are: merus 2,75; carpus i; propodus 2,5. Proportion between the length of the merus and that of the propodus 1,1. Merus 4,4-times, propodus 6,25- times longer than wide, the latter with 9 spinules long 0,095 — 0,117111111. Dactylus almost one- fifth of the propodus. In the three other specimens from this station the basicerite is unarmed above, as !34 267 in Syn. kastilicrassus, though the upper angle is acute. One of them, a female long 11 mm., bears ova that are 0,88 mm. long. The telson agrees with the preceding specimen, but the two pairs of spinules are situated farther from one another, the proportion between the distances of either pair from the posterior margin being 1,83, instead of 1,6. Merus of large cheliped 2,4-times, that of the other 2,76-times longer than wide and in each merus the upper margin ends in a small acute tooth. Proportions of the large chela : fingers i; total length 4,2; height 1,56; proportions of the small chela: fingers 1 ; total length 2,62 ; height 0,92. Proportion between the length of both chelae 2,5. Relative dimensions of the third legs: merus 2,8; carpus i; propodus 2,3, the latter with 11 spinules, long 0,1 mm.; proportion between the length of the merus and that of the propodus 1,2. Dactylus one-fifth the length of the propodus. General distribution: Maldive and Laccadive Archipelagoes. f 26. Synalpkeus ancistrorhynckus de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 124. Stat. 273. December 23/26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 13 m. Sand and shells. 2 males. A new species of the Paulsoni group, related to Syn. acanthitelsonis Cout. Rostrum short, twice as long as wide at its base and reaching to the middle of the visible part of first antennular article; the frontal spines, which are separated from the rostrum by intervals rounded at their base, are slightly shorter and the three spines are curved upward at their tips, like barbed hooks (i'yxts-pov). The obtuse, rostral carina is continued to a little behind the corneae, disappearing here gradually. Antennular peduncle 4,3-times longer than thick at the distal end of median article; median article a little longer than thick, measuring three-fourths of the length of the visible part of basal article, third article a little shorter than the second. Stylocerite acuminate, reaching to the 2nd third part of median article. Lower spine of basicerite just as long as the stylocerite, not shorter, in the younger specimen even slightly longer. The carpocerite, 4,3-times longer than wide, surpasses the antennular peduncle by two-thirds the length of the third article, upper spine of the basicerite small, curved upward and outward. The terminal spine of the scaphocerite, the outer margin of which is slightly concave, surpasses the antennular peduncle, but is shorter than the carpocerite and exceeds by half its length the narrow scale that hardly reaches the end of median article. All the abdominal pleura terminate in a triangular point, that is rather acute in the 3rd — 5*, less so in the others; the anterior angle of the third is also acute. The telson much resembles that of Syn. acanthitelsonis Cout., but it narrows more considerably backward, the length being 2,42-times as long as the width of the posterior margin and the proportion between the latter and the greatest width being 2,1; the posterior angles are prolonged to triangular spines, which project by half their length beyond the median part of the margin. The two pairs of spinules of the posterior margin are nearly of !35 268 equal length, the inner just half as long as the distance between the spiniform angles, the outer but a little shorter and both pairs somewhat project beyond the postero-lateral spines. The spinules of the upper surface are large, those of the anterior pair are just as long as the internal spinules of the posterior margin, those of the posterior are a little longer; the anterior are situated far before the middle, the proportion between the length of the telson and their distance from the posterior margin being 1,6 and the proportion between the distances of either pair from the posterior margin is 1,93. In the other younger specimen the telson is still more elongate, the proportion between its length and the distance of the postero-lateral spines being 2,8, while the proportion between the latter distance and the width at the base is 2,3; the proportion between the length of the telson and the distance of the anterior pair from the posterior margin is 1,7, while the proportion between the distances of either pair from the end of the telson is 1,65. Merus of large cheliped, in the larger specimen, 1,88-times longer than wide, with a spiniform tooth at the apex of the upper margin. The relative dimensions of the large chela are: fingers i; total length 3,74; height 1,52; proportion between the total length and the height being 2,45. At the supero-internal side the anterior margin of the palm ends in a conical, though rather obtuse tubercle. Merus of small cheliped 3-times longer than wide, upper margin truncate and unarmed at apex. The relative dimensions of the small chela are: fingers i; total length 2,54; height 0,81 ; proportion between the total length and the height 3,1. Larger chela 2,6-times as long- as the other. In the second pair the merus is 4,5-times longer than wide. First segment, like the following, also of a stout shape, 3-times longer than thick and somewhat shorter than the sum of the four following, that, taken together, are 1, 3-times as long as the first segment; the chela, the fingers of which are one and a half as long as the palm, appears hardly shorter than the sum of the four last segments. The second segment is slightly shorter than the third and than the fourth that are equal and the fifth segment is one-third longer than wide. Following legs also of a rather stout shape. The relative dimensions of the third legs, which, except the dactylus, much resemble those of Syn. pachymeris Cout., are: merus 2,8; carpus i; propodus 2. The merus, which is. 3,43-times longer than wide, bears 3 small and feeble, movable spinules, long 0,09 — 0,1 mm., on the distal third of the posterior margin, a quite remarkable character, because in the species of the Paitlsoni group the merus appears as a rule unarmed. The propodus, 4,65-times longer than wide, narrows distally as in Syn. padiymeris Cout. and is armed with 8 spinules, that are 0,08 — 0,11 mm. long. Measured from the extremity of the ventral hook to the proximal end of the anterior border, the dactylus appears to measure one-sixth the length of the propodus and to be just twice as long as broad at the base. The dactylus much resembles that of Syn. acanthitelsonis. The ventral hook, that measures one-sixth the total length of the dactylus, is one and a half as long as broad at its base, its posterior margin rejoins by a concave curve the posterior margin of the dactylus, whereas the S-like shaped anterior runs nearly perpendicularly to the latter-, the tapering and curved, dorsal hook is twice as long as the other and one and 136 269 a half as wide at its base as the ventral hook. The interval between both hooks is rounded at the base and, as in Syn. acanthitelsonis, a fissure runs inward, soon dividing itself in two other ones, the anterior of which runs obliquely towards the curved anterior margin of the joint. One observes in the interior of the ventral hook also some narrow bands or stripes that curve backward, just as in Syn. acanthitelsonis. In Syn. acanthitelsonis, hovvever, the ventral hook is longer with regard to the dorsal and both hooks are equally broad at their base. These legs are slisfhtly setose. Relative proportions of the fifth legs: merus 1,5; carpus i; propodus 1,43. The merus is 3,6-times, the propodus 5,55-times longer than wide and the dactylus measures a little more than one-sixth of the propodus. The larger specimen is almost 1 1 mm. long, the other 9,5 mm. f27. Synalpheus Patdsoni Nob. var. Raiucswarcnsis Cout. Alpheus sp. J. G. de Man, in: Zoolog. Jahrb. Abth. f. Syst. IX, 1897, p. 738, Fig. 62a and Ó2aa. Synalplieus Paulsonï Ramesivarensis H. Coutière, in: Buil. Soc. Philom. Paris, (9) T. XI, 1908, p. 1 1. A new examination of one of the 6 specimens from Atjeh, described by me (1. c.) as Alpkeus sp., which specimen, 13 mm. long, belongs to my private collection, proved it to appertain to Syn. Paulsoni Nob. var. Ramesivarensis, a variety which occurs at Rameswaram, near Ceylon. In the variety Rameswarensis the terminal spine of the scaphocerite should, as in the typical Syn. Patdsoni, be longer than the carpocerite, in the Atjeh specimens, however, the terminal spine extends as far forward as the carpocerite. The specimen which is lying before me, accords with the quoted description, but the following measurements will still be welcome. The carpocerite is 3,4-times as long as wide. Measurements of the large chela : fingers i; chela 3,3; height 1,1. Chela 3-times as long as high, palm terminating in a small, conical tooth that is directed straightly forward. Merus unarmed. Measurements of third legs: merus 2,4; carpus i; propodus 2. Merus 3,9-times as long as wide, propodus 6-times, with 6 spinules on the posterior margin besides 2 at the distal extremity; these spinules are 0,16 — 0,2 mm. long. Length of the telson 2,24-times as long as the posterior margin is wide; outer angles of the latter spinous, but only reaching to midway the length of the posterior margin. Proportion between the width at the base and that of the posterior margin 1,8. Spinules of the upper surface 0,24 mm. long, one-eighth the length of the telson. Anterior pair of spinules nearly in the middle, posterior pair a little farther distant from the posterior margin as from the anterior pair; distances of both pairs from the posterior margin in proportion to one another as 1 :o,58. This form was not collected by the "Siboga". f28. Synalpheus gracilirostris de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 19 10, p. 291. Stat. 282. January 15/17. 8°25'.2S., I27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 2 specimens, 1 of which is ova-bearin». 137 SIBOGA-EXPEDITIE XXXIX a'. 35 2-0 A new species of small size of the Paulsoni group, related to Syn. huluhnsis Cout. The ova-bearing specimen possesses all its legs and will therefore be described as the type, the other has lost the large cheliped. Rostrum slender, S or 9-times as long as wide in the middle and reaching to the 2nd third part of median antennular article; the rostrum which distinctly widens at its base, the width being here about one-third the length, is directed a little obliquely downward, while the lateral spines project horizontally forward. Lateral spines also slender, acuminate like the rostrum, but notably, viz. two-fifths, shorter, extending to the distal third of the visible part of basal article; the tips of the lateral spines are turned inward, their outer margin is concave at the base, while the notches by which they are separated from the rostrum, resemble those of Syn. huluhnsis, the anterior wall of the frontal region being visible from above. Antennular peduncle 4-times as long as wide at the distal extremity of the second article ; the relative proportions of the visible part of the first article and of the two following are as 8:5:5, the basal article being a little more than one and a half as long as the second, the second just as long as the third ancl slightly longer than thick distally. Stylocerite acuminate, extending to the distal 4th part of median article. Lateral spine of basicerite rather stout, much shorter than the stylocerite, but exactly as long as the outer margin of the basal portion and reaching as far forward as the first anten- nular article; upper angle subacute, but not spiniform. Carpocerite 3,75-times — in the other specimen 3,8-times — longer than wide, surpassing the antennular peduncle only by one-fifth or one-sixth of the third article, — in the other specimen a little more; the terminal spine of the scaphocerite is slightly curved inward, distinctly exceeds the carpocerite and surpasses by one-third of its length the tip of the scale, that reaches a little beyond the middle of third antennular article. Telson 3-times — in the other specimen 2,34-times — as long as the posterior margin is wide, greatest width twice as broad as the latter. The spinules of the upper surface are small, those of the anterior pair 0,13 mm. long, those of the posterior 0,15 mm. and situated near the lateral margins ; the proportion between the length of the telson and the distance of the anterior pair from the posterior margin is 1,82, the proportion between the distances of both pairs from the posterior margin 1,6, while these numbers are, in the other specimen, respectively 1,77 and 1,67. Postero-lateral angles acute, like in Syn. huluhnsis, not spiniform, very short; median part of the posterior margin more prominent than in this species, al most sem icircula r. In both specimens the spinules of the posterior margin are lost. Merus of larger cheliped 2,1-times, that of the smaller 2,76-times as long as wide, in both meri the upper margin terminates in a small spiniform tooth at the apex; the merus of the larger cheliped is 1,1 4-times as long as the other. Relative dimensions of the larger chela : fingers i; total length 3,87; height 1,35, this chela being 2,87-times as long as high. The anterior margin terminates in a small, rather obtuse tubercle, which does even not exist in the smaller chela, the relative dimensions of which are: fingers i; total length 3,25; height 1, the tapering fingers being shorter than in Syn. huluhnsis. Larger chela 2, 4-times as long as the other, in Syu. huluhnsis 3-times. 138 271 The second legs much resemble those of Syn. hululensis. The first segment, 5,2-times as long as thïck at the distal extremity, appears as long as the sum of the four following and one-fifth longer than the chela, the fingers of which are one-third longer than the palm ; the second, the third and the fourth segment are equal. Relative dimensions of third legs: merus 2,4; carpus i; propodus 2,23 — in the other specimen respectively 2,5; i; 2,2. Merus 4,6-times, in the other specimen 5-times as long as wide; propodus 7,1-, respectively 7-times as long as wide, with 9 spinules long 0,09 — 0,12 mm. Measured from the proximal end of the anterior margin to the tip of the ventral hook, the dactylus appears to measure a little less than one-fifth of the propodus. The dactylus resembles that of Syn. hululensis\ it is 2,8-times as long as wide near the articulation, ventral hook one and a half as long as wide at its base, dorsal hook nearly just as broad at its base, but a little more than one and a half as long as the ventral hook; notch between both hooks obtuse. In the ova-bearing female the merus of the third legs is 1,07-times, in the other specimen 1,1 5-times as long as the propodus. Ova few in number, rather large, 0,6 — 0,75 mm. long. Length of the egg-bearing female 10 mm., the other specimen is a little younger. Remarks. This species seems to approach also to Syn. Mac-CiillocJii Cout. from Australia, but it dirïers by the less stout shape of the carpocerite, by the lateral spine of the basicerite being not longer than the basal portion and perhaps by other features. f 29. SynalpJicus hilarulus de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 290. Stat. 152. August 12/13. Wunoh-bay, N.W. coast of Waigeu-island. Reef. 1 egg-bearing female. A species of the Pauhoni group, apparently closely related to Syn. Paiihoni Raines- warcnsis Cout. and to Syn. Paulsoni liminaris Cout., but which is described as new, because I do not succeed in identifying it with certainty with any of these forms. Rostrum 3-times longer than wide at its base, not curved upward at the tip and reaching almost to the apex of first antennular article; lateral spines one-fourth shorter than the rostrum, with the pointed, acuminate tips slightly directed inward and separated from the rostrum by notches that are narrowing backward, like those of Syn. Pauhoni Xob. (vide H. Coutière, in: Proc. U.S. Nation. Mus. XXXVI, 1909, p. 23, Fig. 2). Antennular peduncle stout, 3,66-times longer than wide at the distal extremity of median article. Measured in the middle of the upper surface, the visible part of the basal article appears almost one and a half as long as the second, which is hardly longer than wide at the apex; third article almost as long as the second, very little shorter. Stylocerite acuminate, extending almost to the end of second article, with both the outer and the inner margin straight. Lateral or lower spine of the basicerite just as long as the outer margin of the basal portion, much shorter than the stylocerite and hardly extending beyond the basal antennular article. Carpocerite 3, 3-3, 5-times longer than wide in the middle, measured on the lower side and exceeding the antennular peduncle by two-thirds the third article ; outer margin of scaphocerite 139 2 7 2 almost straight, the terminal spine which is not curved inward and which al most reaches to the tip of the carpocerite, exceeds by one-third of its length the rounded tip of the well developed scale, which is hardly shorter than the antennular peduncle. Upper spine of basicerite very small, 0,13 mm. long. The length of the telson equals 2,44-times the width of the posterior margin, proportion between the width at base and that of the posterior margin 1,9. The spinules of the upper surface are small, those of the posterior pair are 0,2 mm. long; the anterior pair is situated just midway between the base and the posterior margin, almost as far distant from the lateral margins as from the median line of the telson, proportion between the distances of both pairs from the posterior margin 1,8. Posterior margin a little prominent, outer angles accented, but not spinous, very short ; internal longer spinules about halt as long as the width of the posterior margin. The merus of the larger cheliped is just as long as that of the smaller and in both meri the upper margin terminates in a small, acute tooth ; the former is 2,1-times, the latter 2,3-times as long as wide. Measurements of the larger chela : fingers 1; total length 4,6; height 1,6; this chela is 2,82-times longer than high and 2,46-times as long as the smaller chela. Anterior margin of the palm terminating in a small, acute spine, which is slightly directed downward. The small chela has, as proportions: fingers i; total length 2,44; height 0,81, this chela being just 3-times longer than high ; palm unarmed, fingers tapering. Merus of second legs 5-times as long as wide. The first segment of the carpus is 4,6-times as long as thick and as long as the sum of the four following; it is slightly longer than the chela, the fingers of which are one-sixth longer than the palm ; the third segment appears a little larger than the second or the fourth. The third legs show the following relative dimensions: merus 2,23; carpus i; propodus 2,05. The merus is unarmed, 3,66-times longer than wide and 1,1-times longer than the propodus; propodus 6-times longer than wide, slightly narrowing distally and armed with 6 spinules, that are 0,15 — 0,22 mm. long. Measured from the base of the anterior margin to the extremity of the ventral hook, the dactylus proves to measure one-fourth of the propodus and to be 3-times as long as wide near the articulation, being of a rather slender form; the ventral hook which makes a very obtuse angle with the posterior margin of the dactylus, is one and a half as long as broad near the articulation, its posterior margin is straight, the anterior arcuate. The dorsal hook is twice as long, but just as broad at its base as the other, a little more than 3-times as long as wide at its base and presents therefore a more slender shape ; notch between the two hooks rather sharp, acute. These legs are slightly setose. Ova not numerous, rather large, 0,95 mm. long. Length 15 mm. Rem ark s. Syn. h ui 'ulensis Cout. and Syn. tumidomanus (Paulson) differ from this species by the carpocerite and the antennular peduncle being of a more slender form: the carpo- cerite is namely 4-times longer than wide, whereas the median antennular article is one and a half as long as wide at the apex. Paulson's species cliffers moreover by the clearly spinous, postero-lateral angles of the telson. 140 273 Syu. Pau/sou i Nob., together with the subspecies described by Coutière, may be distinguished by the terminal spine of the scaphocerite projecting beyond the carpocerite ; Syn. Paulsoni Ramestvarensis and the typical Syn. Paulsoni differ, moreover, by the lateral spine of the basicerite being shorter than the outer margin of the basal portion; Syu. Paulsoni liminaris bv the upper angle of the basicerite bearing no spine, whereas, like in Syn. Paulsoni Senegambiensis, the carpocerite has a more slender form. The carpocerite of Syn. Paulsoni Kurrachccusis, finally, is 2,75-times as long as wide. IV. Biunguiculatus group. f30. Synalpketis biunguiculatus (Stimpson) Cout. Synalpheus biunguiculatus (Stimpson) H. Coutière, in: Alpheidae Mald. and Laccad. Archip. 1905, p. 873, PI. LXXI, Fig. 8. Nee: Alplicus biunguiculatus J. G. de Alan, in: Archiv f. Naturg. 53. Jahrg. 1887, p. 502, Fig. 6 and da. Stat. 64. May 4 '5. Kambaragi-bay, Tanah-Djampeah. Depth up to 32 m. Coral, coralsand. 1 ova-bearing female. Stat. 282. January 15/17. 8°2s'.2S., i27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 male and 1 ova- bearing female. Stat. 299. January 2729. lO°52'.4S., I23°i'.iE. Buka- or Cyrus-bay, South coast of Rotti- island. Depth up to 36 m. Lithothamnion. 1 ova-bearing female. It is with some doubt that these specimens are referred to Syn. biunguiculatus (Cout.), not only because in Coutière's description no measurements at all are indicated, but also because in all these specimens the large cheliped is missing. In the male from Stat. 282, long 13,5 mm., the frontal and the antennal region closely accord with Fig. S of Coutière's paper: the rostrum is 4,4-times as long as wide in the middle, just as long as the triangular, obtusely-pointed, lateral spines and reaches just to the middle of the visible part of first antennular article. The antennular peduncle is 4,5-times as long as wide at the distal extremity of median article, this article one-third longer than wide distally ; the visible part of basal article is one and a half as long as the second, the third one-fourth shorter than the second. Carpocerite five-times as long as wide, surpassing the antennular peduncle by the whole length of third article ; the two spines of the basicerite are as long as in Fig. 8, but slightly curved outward at their tips. The scale extends to the apex of median article, the terminal spine almost to that of the third, but the free part of the scale extends farther backward than in Fig. 8. namely almost to the middle of the visible part of basal article. The specimens from the stations 64 and 299, which are iS mm. and 15 mm. long, fully accord with the described one, but in the female, long 13 mm., from Stat. 282 the rostrum and the lateral spines agree with Fig. 9 of Coutière's paper, which represents Syn. pachymeris . For the measurements of the telson I refer to table A, which indicates that the telson presents nearly the same dimensions in the male and in the female from Stat. 282, though 141 274 the female differs somewhat from the male and from the two other specimens as regards the frontal teeth and the measurements of the legs. The telson resembles Fig. Sd (1. c), but the posterior margin is a little less prominent and its outer angles are decidedly acute, though measuring only one-fourth of the contiguous, short, outer spinules. The anterior spinules of the upper surface are 0,25 mm. long, those of the posterior pair 0,27 mm.; they are rather large, those of the posterior pair measuring, in the male, about one-eighth of the length of the telson. Merus of the small cheliped of the male 3,4-times as long as wide, upper margin unarmed at apex. Relative dimensions of small chela : fingers i; total length 3,32; heigth 1,1, the chela just 3-times as long as high. The fingers measure in Fig. Só (1. c.) just one-third the total length of the chela, but are in the male from Stat. 282 a little shorter; the fingers are tapering, not enlarged and the dactylus is fringed, along its outer • margin, with rather long, stiff setae, both in the male and in the female. Merus of second legs in the male 5-times as long as wide. First segment of the carpus 3,6-times longer than thick, a little shorter than the sum of the four following, the proportion being as 1 : 1,125; chela precisely as long as the first segment, fingers one-third longer than the palm. The females from the two other stations agree with the male, but in the female from Stat. 2S2 the merus is 4,4-times longer than wide; the first carpal segment is 3-times as long as thick and comparatively shorter, the proportion between this segment and the sum of the four following being 1,37; the chela appears a little longer than the first segment. As results from Table B the relative dimensions of the female from Stat. 282 agree much more with those taken from the figure 8 c (1. c.) than with those of the male and of the two females from the two other stations, probably, however, these differences may be considered as individual. The propodus bears in the specimens from Stat. 282 eight spinules, in the adult female from Stat. 64 nine, in that from Stat. 299 ten spinules. Measured from the base of the anterior margin to the tip of the ventral hook, the dactylus proves to measure one-sixth of the propodus and to be little more than twice as long as broad near the articulation ; the two hooks are subequal in length, the ventral twice as long as broad at its base, the dorsal hook appears a little broader at its base than the ventral when measured from the suture to the anterior margin ; the anterior margin of the ventral hook is directed obliquely to the posterior margin of the appendage, the two hooks are parallel and the notch between them is concave at the base, while in Fig. 8 c' (1. c.) the angle appears acute. Uva rather numerous, 0,73 — 0,8 mm. long. Table A. Proportion between the length of telson and width of posterior margin. . Proportion between the width at the base and that of the posterior margin Proportion between the length of the telson and the distance of the anterior pair of spinules from the posterior margin Proportion between the distances of both pairs from the posterior margin. NO 1. NO 2. NO 3. 1 0-5 3.32 3.2S 2 2 2,4 2,6 1.45 1,43 i,S I.S7 1,72 !-/ No 4. 3-1 2,24 1,4 1,53 142 75 Table B. of the third let N° i. N<> 2. N« 3- No 4. | 2,6 2,5 2,5 2,5S I [ I i >,7 i.7 i,36 i,8 i.57 i.45 1,83 i,45 3,56 3,7 3 3,4§ 5 5 4 5 X" 5. 2,3 5 1 1,56 i,5 3,18 4 ( Merus Relative dimensions of f Carpus ' Propodus Proportion between the merus and the propodus . Proportion between length and width of merus. Proportion between length and width of propodus. N° 1 female from Stat. 64; N° 2 male, Nu 3 female from Stat. 282; Nfl 4 female from Stat. 299; N° 5 measurements of the species occurring in the Maldive Archipelago, taken from Fig. Sc of Coutière's paper. General distribution: Suez (Coutière); Djibouti (Coutière); Maldive and Laccadive Archipelago (Coutière). f31. Synalpheus amabilis de Man. J. G. DE Man, in: Tijdsein-, d. Ned. Dierk. Vereen. (2) Dl. XI. 1910, 295. Stat. 240. November 22 till December 1. Banda. From 9 — 36 m. Lithothamnion. 1 young specimen, without eggs. A new species of the Biunguiculatus group, closely related to Syn. biiuiguiculatus exi- lipes Cout. (H. Coutière, Fauna Mald. and Laccad. Archip. 1905, p. 8 74, PI. LXXI, Fig. 10). Rostrum acute, a little more than one and a half as long as wide at its base, slightly reaching bevond the middle of the visible part of basal antennular article; lateral spines also acute, one-fifth shorter than the rostrum, projecting straightly forward and separated from the rostrum by broad intervals, the outer margins of which are sinuate at the base. Antennular peduncle 4,3-times as long as wide at the distal end of median article; visible part of the basal article one and a half as long as the second, the latter a little longer than wide at the distal end (proportion 5 : 4), the third article one-fifth shorter than the second ; the three articles are in the proportion to one another as 8:5:4. Stylocerite acuminate, as long as basal article. Lower spine of the basicerite rather stout, a little shorter than the stylocerite and than the outer border of the basal portion ; upper angle unarmed, obtuse. Carpocerite 4,5- times as long as wide in the middle, measured on the lower face, and surpassing the antennular peduncle by the total length of third article. Outer margin of the scaphocerite slightly concave, the terminal spine as long as the antennular peduncle and exceeding by one-fourth of its length the rounded tip of the well developed scale that reaches to the 2nd third part of the distal antennular article. Telson quite characteristic, much narrowing backward. Its length equals just 4-times the width of the posterior margin, the latter one-third of the width at base; posterior margin very prominent, semicircular, outer angles not marked, longer internal spinules reaching f ar beyond the end of the telson, their length being in proportion to the width of the posterior margin as 18 : 25. The spinules of the upper surface are small, of equal M3 276 length, viz. 0,15 mm. long, and inserted near the lateral margins; the anterior pair a little before the middle, the proportion between the length of the telson and the distance of the anterior pair from the posterior margin being 1,64, whereas the proportion between the distances of both pairs from the end of the telson is indicated by the number 1,74. In both chelipeds the upper margin of the merus ends in a small acute tooth at the apex, the merus of the large cheliped is 2,6-times as long as wide, that of the other 3,53- times. The large chela shows the following proportions: fingers (dactylus) i; total length jy77'i height 1,18. The chela is 3,2-times as long as high and the anterior margin of the palm terminates in an acute spiniform tooth, which is directed obliquely upward. The large chela is 2,76-times as long as the smaller, which is 3,5-times as long as high; the proportions of the smaller chela are: fingers i; total length 2,73; height 0,8. Palm unarmed distally, fingers tapering; the dactylus is glabrous above, the fingers presenting only the usual setae along their margins. Merus of second legs 5,3-times as long as wide, just as long as the telson. The first segment of the carpus, that is 4-times as long as thick, appears a little shorter than the sum of the four following, the proportion being as 1 : 1,1 ; the chela, the fingers of which are in proportion to the palm as 7:5, appears as long as the four last carpal segments taken together. Following legs slender, resembling those of Syn. öiungtiiciiiatus exilipes Cout. Relative dimensions of the third legs: merus 2,5; carpus i; propodus 2,2. Merus unarmed, slender, 4,8- times as long as wide and 1,1 4-times longer than the propodus; the merus is just as long as that of the small cheliped. Propodus also slender, 8-times as long as wide, with 10 rather short spinules on the posterior margin that are 0,066 — 0,088 mm. long. When measured from the base of the anterior margin to the tip of the ventral hook, the dactylus which is 2,6-times as long as wide near the articulation, proves to measure almost one-seventh of the propodus. The dactylus resembles that of the variety exilipes Cout. (H. Coutière, 1. c. Fig. \oa")\ the ventral hook, which is one and a half as long as thick at its base, continues the lower margin in a concave curve, but the dorsal hook which is about twice as long as thick at its base and here slightly thicker than the other, appears just one and a half as long as the latter; notch between the two hooks rounded at the base. Length of the single specimen 10,5 mm. f32. Synalpheus bituberculatus de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 19 10, p. 294. Stat. 60. April 27/28. Haingsisi, Samau Island, Timor. Lithothamnion in 3 m. and less. 1 ova- bearing female. Stat. 78. June 10/11. Lumu-Lumu-shoal, Borneo-bank. Coralreef. 1 young specimen. Stat. 164. August 20. i°42'.5 S., I30°47'.5 E. Between Misool and New Guinea. 32 m. Sand, small stones and shells. 4 adult specimens, the largest one ova-bearing. Stat. 184. September n/12. Anchorage off Kampong Kelang, South coast of Manipa-island. 36 m. Coral and sand. 1 very young specimen. Stat. 273. December 23/26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 13 m. Sand and shells. 6 specimens of medium size or still younger, the largest specimen with eggs. i44 -/ / Stat. 282. January 15/17. 8°25'.2S., i27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 specimen of medium size. Stat. 315. February 17, 18. Anchorage East of Sailus Besar, Paternoster-islands. Depth up to 36 m. Coral and Lithothamnion. 1 ova-bearing female of medium size, lodging a Bopyrid in the carapace, and 3 young specimens. A new species of the Bijingnictdahis group, closely related to Syn. pachymeris Cout. from the Western Indian Ocean, but at first sight distinguished from this and perhaps from all other species of this genus, excepting Syn. Pescadorensis Cout. and Syn. septemspinosus de Man, by the anterior margin of the palm of the large chela terminating in two conical tubercles placed abreast. Thanks to the kindness of Professor Coutière a specimen of Syn. pachymeris, from Saya de Malha (Percy Sladen Trust Expedition) and determined by him, is lying before me. The four specimens from Stat. 164, the largest of which, an egg- bearing female, is 21,5 mm. long, have lost the large cheliped, therefore one of the specimens from Stat. 273, a male long 12,5 mm., will be described as the type. The rostrum is slender, five times as long as wide in the middle, the acute tip is curved upward and reaches to the middle of the visible part of first antennular article ; the rostrum is carinate above and the rostral carina extends to the posterior end of the eyes. Lateral spines triangular, acute, one-third shorter than the rostrum, reaching to the 2nd third of the visible part of basal article, slightly setose at the tips that are not curved upward, with the outer margin slightly concave and separated from the rostrum by wide intervals, obtuse at the base. Second article of antennular peduncle one and a half as long as wide distally, measuring two- thirds the visible part of basal article and one-third longer than the third article, the proportions of the three articles being as 6:4:3. Stylocerite slender, acuminate, reaching to the second 3rd or 4th part of median article. Basicerite with the upper spine well developed, the acute tip directed upward and ontward; lateral or inferior spine slender, longer than the stylocerite, reaching to the middle or just beyond the middle of median article, with the acuminate tip slightly turned outward. The carpocerite is slender, 5,5-times longer than wide, exceeding the antennular peduncle by the whole length of the third article ; terminal spine of scaphocerite a little shorter than the carpocerite, but still much surpassing the antennular peduncle, its outer margin slightly concave, but not curved inward at the tip ; it exceeds by half its length the verv narrow scale that reaches to the apex of median antennular article. The telson, the measurements of which are found in Table A, resembles that of Syn. pachymeris. The length equals 3 — 3,24-times the width of the posterior margin and in both species the anterior pair of spinules are situated far before the middle; the posterior margin, however, is less prominent than in Syn. pachymeris and in the latter the spinules of the upper surface are inserted nearer to the lateral margins. Outer angles of the posterior margin acute, though very short. In the young male from Stat. 282 the telson appears a little shorter with regard to the width of the posterior margin. • Posterior angle of first abdominal pleura produced, in the male, into a small tooth, the following also acute while in the third and the fourth the anterior angle is also sharp. Merus of large cheliped of the male twice as long as wide, with a small, acute tooth '45 S1BOGA-EXPEDITIE XXXIX tf'. 36 278 at the apex of the upper margin ; there is also an acute tooth at the apex of the infero- , external margin. The measurements of the large chela, taken along the infero-external side, are: fingers i; total length 3,3; height 1,2, this chela being 2,75-times longer than high. Characteristic of this species are two conical, though rat her obtuse tubercles, placed abreast at the anterior margin of the palm and directed obliquely forward and upward; they are nearly of the same size, the outer usually a little smaller than the other. The large chela of an ova-bearing female from the same station and about of the same size as the male, shows the following proportions : fingers i; total length 3,75; height 1,5, the chela being just 2,5-times longer than high. In an egg-bearing female from Stat. 315 these numbers are : fingers 1 ; total length 4; height 1,6. The two tubercles on the anterior margin of the palm are just as well developed as in the male. In the male from Stat. 273 the large chela is 2,7-times longer than the other and the relative dimensions of the small chela are : fingers 1 ; total length 3 ; height 1 . Merus of small cheliped 3,6-times longer than wide. In the small chela of the adult female, long 21,5 mm., from Stat. 164 the fingers are a little longer, the proportions being: fingers 1 ; total length 2,9; height 1. The merus is unarmed at the apex of the upper margin and the palm bears no tubercles near the articulation of the dactylus. Merus of second legs 4,45-5-times longer than wide. First carpal segment rather stout, shorter than the sum of the following and from the measurements in Table B it seems to result that the difference diminishes the larger the specimens are. The second, the third and the fourth segment are of equal size. Chela slightly longer than the first segment, but shorter than the sum of the following, fingers in proportion to the palm as 4:3. The relative dimensions of the third legs and the proportion between the length of the merus and that of the propodus are indicated in the Table C. Merus 3,3 — 3,6-times longer than wide; in the typical male from Stat. 273 it bears five spinules on the distal half of the posterior margin, which are 0,12 — 0,17 mm. long, and the propodus is armed with eight spinules, long 0,15 mm.; in the adult female, long 21,5111111., from Stat. 164 the merus is armed with seven spinules, long 0,15 — 0,22 mm., in the very young specimen from Stat. 184, however, there are only two spinules, long 0,036 and 0,055 mm., on the merus and seven spinules on the propodus. Dactylus one-sixth of the propodus, when measured from the proximal extremity of the anterior margin to the tip of the ventral hook and 2,2-times longer than wide; in the adult female from Stat. 1 64 the dactylus measures hardly one-seventh the length of the propodus and appears twice as long as wide. Dactylus similar to that of Syn. pachymcris, dorsal hook twice as long and one and a half as wide at its base as the ventral (the width taken from the suture near the base of the ventral hook to the outer margins) ; in young specimens, as e. g. in that from Stat. 78 the dorsal hook appears one and a half as long and but a little broader than the ventral hook; interval between both hooks wide, rounded at the base. In the specimen from Stat. 78 the rostrum appears just as long as the acute, lateral teeth which are directed inward ; in the adult specimens from Stat. 1 64 the three frontal spines are shorter than in the described male, the rostrum reaching about to the 2nd third part of the visible basal joint, and the lateral spines are still shorter. 146 279 The eggs are rather numerous, those of the female, long 21,5 mm., are 1,17 mm. long, those of a female, long 14,5111111., from the Jedan Islands, 1,02 mm. and those of a female from Stat. 315 are 1,09111111. long. Table A. Proportion between the length of the telson and the width of the posterior margin Proportion between the greatest width and that of the posterior margin Proportion between the length of the telson and the distance of the anterior pair from the posterior margin Proportion between the distances of both pairs from the posterior margin N« 1. N» 2. N» 3. N» 4. N» 5. N» 6. 2,2 i.4 1,6 3 3 3>2 3,24 1 2,6 2,33 2,2 2,2 2,36 2,1 1,64 i.3S i,Si i,45 i,43 1,72 1,62 i,7 1,8 1.7 Table B. Proportion between the length and the width of the merus Proportion between the length of the first carpal segment and the sum of the following Proportion between the length and the width of first of second legs N» 1. N° 2. N» 3. N» 4. N» 5. N« 6. 4,2 4,58 4,45 5 4,5 4,6 i-5 r,i 1,6 i,33 1,25 2,73 3-1 2,5 3 3,16 1,2 3-1 Table C. j Merus Relative dimensions of j Carpus ' Propodus Proportion between the length of the merus and that of the propodus Proportion between the length and the width of the merus Proportion between the length and the width of the propodus. . of third legs No 1. N» 2. N° 3. N» 4. No 5. N"o 6. 2-7 I i.5 i,8 3-2 3-75 ' 2,7 3 3 3 2,8 I 1 1 1 1 i.9 1,83 2,2 1,9 1,9 1,42 1,6 i,4 1,58 i,5 3,6 3.4 3.26 4,75 4,55 5,4 4,8 4,65 X° 1 specimen long 11,5 mm. from Stat. 78; N° 2 ova-bearing female, long 21,5 mm., from Stat. 164; X" 3 young specimen, long 7,5 mm., from Stat. 184; N° 4 male, long 12,5 mm., from Stat. 273; N° 5 specimen from Stat. 282; N° 6 cotype of Syu. pachymeris Cout. from Saya de Malha, long 10,5 mm. Remarks. Synalpheus pachymeris Cout. at once differs by the anterior margin of the palm of the large chela terminating only in one tubercle, which is directed straightly forward and not obliquely upward. It differs also by the terminal spine of the scaphocerite being not longer, but distinctly shorter than the antennular peduncle. The relative dimensions of both chelae are the same in the two species, but the merus appears a little stouter, that of the large cheliped being 1,66-times, that of the smaller 2,6-times longer than wide and the merus of the larger carries an acute tooth at the apex of the upper margin. The measurements 147 28o of the second and third legs and of the telson of the specimen from Saya de Malha are indicated in the Tables sub N° 6; they much agree with those of Syn. bituberculahis, but the propodus of the third legs is shorter with regard to the other joints and appears therefore of a stouter shape because the absolute width is the same. t 33- Synalpheus bispiuostis de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI. 1910, p. 302. Stat. 33. March 24/26. Bay of Pidjot, Lombok. 15 — 22 m. Mud, coral and coralsand. 1 male and 1 ova-bearing female. Stat. 240. November 22 till December 1. Banda-anchorage. From 9 — 36 m. Lithothamnion- bank in 18 — 36 m. 1 very young specimen. A new species of the Bitmgtiiculattis group, closely related to Syn. biwiguiculahcs (Stimpson) Cout., variety cxilipes Cout., but distinguished from all other species of this genus by the posterior margin of 6th abdominal somite being b i s p i n o s e. Frontal spines in the male from Stat. 33 as in the quoted species (H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, PI. LXXI, Fig. 10), but the rostrum less si en der, 4-times as long as wide in the middle and shorter with regard to the length of the visible part of first antennular article, not yet quite reaching to the middle of that part. Lateral teeth and the notches separating them from the rostrum as in the variety exilipcs Cout., the lateral teeth barely shorter than the rostrum and with the tips rather obtuse ; the outer margins of the lateral teeth are very slightly concave and clearly directed inward. Antennular peduncle 4, 4-times as long as wide at the distal extremity of median article; the visible part of first article, the second and the third are in proportion to one another as 7:4:3, just as in Syn. bumgiiiailatus (Stimpson) Cout. (H. Coutière, 1. c. Fig. 8) ; stylocerite reaching to the 2nd fourth part of median article. Carpocerite 5-times as long as wide in the middle, projecting beyond the antennular peduncle by the whole length of third article. Terminal spine of scaphocerite hardly longer than the antennular peduncle, shorter than the carpocerite and extending by one-third of its length beyond the narrow scale that reaches to the 2nd third part of distal antennular article. Lateral spine of basicerite slender, nearly as long as the stylocerite, spine at the upper angle well developed, measuring one-third the length of the lateral. In the female from the same station which is of a somewhat smaller size, the rostrum appears a little more slender than in the male, 5-times as long as wide in the middle and it reaches to the distal third of the visible part of first antennular article; the rostrum is also slightly longer than the lateral teeth. The antennular peduncle is 4-times as long as wide at the distal end of median article, the visible part of the first is but one and a half as long as the second and the second hardly longer than the third ; the stylocerite extends to the 2nd third part of median article and the scale of the scaphocerite almost to the middle of the third. Carpocerite 5-times as long as wide, terminal spine of scaphocerite and spines of the basicerite also like in the male. ■ In the very young specimen, long 7 mm. from Banda, the rostrum resembles that of 148 28l the female, but it reaches to the distal fourth of the visible part of first article, the lateral teeth are of a somewhat stouter shape and only extend to the middle of first article. The antennular peduncle has a much stouter form, being only 3-times as long as thick, the second and the third article are equal and but a little shorter than the visible part of the first. Carpocerite 4, 3-times as long as wide, scale reaching to the middle of third antennular article and somewhat wider than in the adult individuals. In the male the posterior angle of the first abdominal pleura is produced into a subacute tooth, the posterior margin of which bears two small denticles, the anterior angle is also acute; the third and the fourth pleura terminate also in au acute tooth, the anterior angle of the third is acute, that of the fourth rather obtuse ; the second bears a subacute tooth posteriorly, whereas the fifth and the sixth are also acute, especially the fifth. Sixth somite one and a half as wide as long, outer angles of the posterior margin produced into an acute tooth, which is directed slightly outward. Telson, in the adult male, 3,44-times as long as the posterior margin is wide, this margin moderately prominent, the outer angles acute, but not projecting at all ; the longer inner spinules extend by half their length beyond the posterior margin. Proportion between the width at base and that of the posterior margin 2,3. Spinules of the upper surface large, those of the anterior pair 0,365 mm. long, those of the posterior 0,38 mm., one-seventh the length of the telson and situated close to the lateral margins; the anterior pair is situated far before the middle, the proportion between the length of the telson and the distance of the anterior pair from the posterior margin being 1 ,46, the proportion between the distances of both pairs from the posterior margin 1,6. In the female the pleura of the first somite are rounded anteriorly, the second are also rounded, the third and the fourth terminate in an acute tooth; the two following are subacute, sixth somite and telson as in the male. Merus of large cheliped of the male 2,i-times as long as wide, upper margin terminating in a small, acute tooth at apex, the two other margins with the apices also acute. Relative dimensions of the large chela: fingers i; total length 3,7; height 1,33, this chela being 2,75- times as long as high. Anterior margin of the palm terminating in an obtuse tubercle, that is rounded above. Merus of small cheliped 3,2-times as long as wide, the margins unarmed at the apex. Proportion between the length of both chelae 2,4. Relative dimensions of the small chela: fingers i; total length 3,1; height 0,92, this chela 3,36-times longer than high. Dactylus tapering, its outer margin fringed with long stiff setae from the articulation to the tip. Merus of second legs 4,6-times as long as wide. Carpus of a stout shape, first segment 2.75-times as long as thick at distal extremity, a little shorter than the sum of the four following, the proportion being as 4:5; the second, the third and the fourth are equal, a little wider than long. The length of the chela, the fingers of which are one-fourth longer than the palm, appears intermediate between the length of the first carpal segment and that of the four following taken together. Relative dimensions of the third legs nearly as in Syn. biunguiculahts (Stimpson) Cout., 149 282 but the merus is a little more slender (Confer the Table). The propodus of the adult male bears ten spinules that are 0,16 — 0,17 mm. long, that of the young specimen from Banda six, long 0,044 — 0,075 mm- Measured from the base of the anterior margin to the tip of the ventral hook, the dactylus measures in the adult male a little more than one-seventh, in the young specimen one-fifth of the length of the propodus. The dactylus is half as broad at its base as it is long; the ventral hook is twice as long as wide at its base and its anterior margin is almost perpendicular to the posterior margin of the dactylus ; dorsal hook one and a half as long as the other and one and a half as wide at its base, measured from the suture to the anterior margin. The two hooks hardly diverge and the notch between them is concave at the base. Table A. Proportion between length of telson and width of posterior margin Proportion between the width at the base and that of posterior margin Proportion between the length of telson and the distance of the anterior pair from the posterior margin Proportion between the distances of both pairs from the posterior margin Table B. Merus Relative dimensions of ( Carpus Propodus Proportion between the length of the merus and that of the propodus. Proportion between the length and the width of the merus . Proportion between the length and the width of the propodus . of third lees N° 1. N« 2. 3.44 3,6 2.3 2 2 1,46 1.44 1,6 1.7 N° 1. N» 2. 2,5 2,3 I I 1,75 2 i.43 I.I7 4 4.24 5 6 N° 1 adult male from Stat. 33; N° 2 young specimen from Banda. The adult male from Stat. 33 is 15 mm. long, the ova-bearing female 14 mm.; ova few in number, 0,75 mm. long. 734. Synalpheus triacanthns de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 301. Stat. 289. January 20. 9°o'.3S., 126° 24'. 5 E. Timor Sea. 112 m. Mud, sand and shells. 1 male, found in a specimen of Solenocaulon Gray. A new species of the Biïtnguicïdatïis group, distinguished, like Syn. trispinosiis de Man, by the posterior margin of the 6th abdominal somite being armed w i t h three s p i n e s. Rostrum long, slender, acuminate, with the tip curved upward and reaching to the 2ud third part of median antennular article; the free part of the rostrum, vvhich is obtuse above, is a little more than 4-times as long as wide at its base. Lateral spines slender and pointed, slightly directed ontward and upward, measuring a little more than one-third the length of the free part of the rostrum, and extending almost to the middle of the visible part of first anten- nular article. Notches between the lateral spines and the rostrum rather wide, the notches as wide anteriorly as they are long. Antennular peduncle 4,1-times as long as wide at the apex 283 of median article ; visible part of basal article one and a half as long as the second and about twice as long- as the third. Stylocerite characteristic, its basal part, as long as the lateral frontal spines, dilated, the anterior part very slender, spiniform, acuminate, longer than the rostrum, just reaching beyond the middle of the median article, that appears a little viz. one-fourth longer than wide distally. Carpocerite, like in Syn. trispinosus, as long as the antennular peduncle, but of a less slender shape, being 4,5 — 5-times as long as wide in the middle. Lateral spine of basicerite a little shorter than basal antennular article, but much longer than the lateral frontal spines; spine at the upper angle rather large, al most half as long as the lateral. Terminal spine of the scaphocerite as long or hardly longer than the carpocerite, projecting but for a short distance beyond the well-developed, rather broad scale, that almost reaches to the tip of the antennular peduncle. The pleura of the 2nd — 4th somites of the abdomen terminate in an acute tooth, the tooth at the posterior angle of the pleura of the first somite subacute, pleura of the 5th somite also subacute; 6th somite almost twice as wide as long, the median tooth excluded, the posterior margin with a spiniform tooth at the outer angles that is directed out war d and with a smaller one in the middle. Unfortunately the posterior margin of the telson is mutilated, so that its width could not be measured exactly ; the length of the telson seems to equal, however, about 2,4-times the width of the posterior margin and the proportion between the latter and the width at base seems to be about 1,57. Spinules of the upper surface 0,3 mm. long, one-ninth the length of the telson, and implanted near the lateral margins; the anterior pair is placed a little before the middle, the proportion between the length of the telson and the distance of that pair from the posterior margin being 1,7, the proportion between the distances of either pair from that margin 1,66. The outer angles of the posterior margin are spiniform, but probably do not reach beyond the median part. Merus of large cheliped twice as long as wide, the strongly curved, upper margin with the apex unarmed, but presenting here, like in Syn. paraneomeris Cout., a well-marked constriction, which in Syn. trispinosus, at least in the female, is wanting; the infero-external and the infero-internal margin are armed, exactly as in Syn. trispinosus, with an acute tooth. The relative dimensions of the large chela are: fingers i; total length 4; height 1,33, this chela being just 3-times as long as high. Anterior margin of the palm with a subacute tooth, directed obliquely upvvard. Merus of small cheliped 3-times as long as wide, with the three margins unarmed at apex. Proportion between the length of the two chelae 2,73. The relative dimensions of the small chela are: fingers i; total length 2,45; height 0,77. This chela which is 3,1-times as long- as high, appears much less high with regard to its length than the small chela of Syn. trispinosus, both of the male and of the female of this species. Fingers a little more slender than in Syn. trispinosus, in other respects agreeing with them. Merus of second legs 6,4-times as long as wide. First segment of the carpus 5,2-times as long as thick at the distal extremity, one-tenth longer than the sum of the four following; the second, the third and the fourth segment are equal, just as long as thick. Chela scarcely shorter than the sum of the four last segments of the carpus, fingers but a little longer than the palm. J51 284 Relative proportions of third legs : merus 2,4; carpus i; propodus 2, the merus 1,21-times as long as the propodus. Though these proportions are nearly the same as in Syn. trispinosus, these joints show a more slender shape and the merus is quite unarmed. The merus indeed is 4,5-times as long as wide, the propodus 6,6-times and the latter bears ten spinules 0,15 — 0,17 mm. long. Measured to the tip of the ventral hook, the length of the dactylus proves to be one-eighth that of the propodus and twice the width near the articulation. The rather small, ventral hook appears about twice as long as broad at its base and its anterior margin is directed o b 1 i q u e 1 y with regard to the posterior margin of the dactylus ; the m u c h longer and stronger, dorsal hook is twice as long and twice as broad at its base, measured from the suture to the anterior margin of the dactylus, than the ventral hook ; the two hooks very slightly diverge and the notch between both is concave internally. Merus of 4th pair also unarmed. The appendages of the five pleopods are y e 1 1 o w i s h green coloured. Length 16 mm. ■J" 35. Synalpheus quadridens de Man. J. G. de Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 299. Stat. 282. January 15/17. 8°25'.2S., i27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 ova-bearing female. Like in Syn. quadrispinosus de Man, the posterior margin of the 6th abdominal somite is armed with four teeth, but Syn. quadridens, which also belongs to the Biunguiculatus group, differs by the stouter shape of the legs and some other differences. Unfortunately the large cheliped and the second legs are missing. Frontal and antennal region much resembling those of Syn. pachymeris (H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, PI. LXXI, Fig. 9). Rostrum slender, about 4-times longer than wide in the middle, with the tip rather obtuse and almost reaching to the middle of the visible part of first antennular article ; lateral frontal teeth a little longer than the rostrum, reaching just to the middle of the visible part of first antennular article, much wider than the rostrum and much wider at their base than they are long ; notches between the rostrum and the lateral teeth, that are also rather obtuse at the tips, narrow, the distance between the tip of the rostrum and that of a lateral tooth being shorter than the latter are long. The outer margin of the lateral teeth is regularly curved, convex. Antennular peduncle stouter than that of Syn. quadrispinosus, 4-times longer than wide at the apex of median article; the proportion between the length of the three articles just as in Syn. quadrispinosus. Stylocerite shorter than in this species, reaching to the 2nd third part of median antennular article. Carpocerite 5-times longer than wide in the middle, extending beyond the antennular peduncle by half the length of the 3rd article or a little more ; terminal spine of the scaphocerite as long as the antennular peduncle, the tip slightly directed outward and projecting by one- third its length beyond the narrow scale that reaches to the apex of median antennular article. iS2 2»5 Lateral spine of the basicerite as long or slightly longer than the stylocerite, upper spine as in Syn. quadrispinostis. Posterior margin of 6th abdominal somite armed with four triangular, subacute teeth, one at each outer angle and one at either side «f the middle, the external teeth twice as long as the submedian teeth. Telson 2,8-times as long and twice as wide at the base as the posterior margin is broad, the latter being a little wider, comparatively, than in Syn. qnadri- spinosus; posterior margin as in this species. As regards the arrangement of the spinules of the upper surface that are 0,175 mm. long, one-eighth or one-ninth of the length of the telson, this species accords with Syn. quadrispinostis : the proportion between the length of the telson and the distance of the anterior pair from the posterior margin is 1,35, the proportion between the distances of either pair from the posterior margin 1 ,4. Merus of small cheliped 2,65-times longer than wide, upper margin unarmed at apex. Relative dimensions of the small chela: fingers i; total length 3; height 1,2; this chela is just 2,5-times longer than high and has therefore a much stouter form than that of Syn. quadri- spinosus. Fingers as in this species. Merus of second legs 4-times as long as wide, the following joints are missing. Relative dimensions of third legs: merus 2,71 ; carpus 1 ; propodus 1,77, numbers agreeing with those of Syn. quadrispinoszis. Merus 1,53-times longer than the propodus. Merus 3,05-times, propodus 4,2-times longer than wide, both members being ofa stouter shape than in Syn. qtiadrispinosus\ the propodus with eight spinules, long 0,09 — 0,1 mm. Dactylus measuring a little more than one-sixth the propodus and twice as long as broad near the articulation ; its shape is the same as in Syn. quadrispinosus. Ova large, 1,3 mm. long. Length 12 mm. 736. Synalpheus qziadrispinosjis de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 298. Stat. 49'. April 14. 8° 23'. 5 S., H9°4'.6E. Sapeh-Strait. 70 m. Coral and shells. 1 young male. Stat. 164. August. 20. i°42'.5 S., i30°4/'.5 E. Between Misool and New-Guinea. 32 m. Sand, small stones and shells. 1 adult specimen without eggs. Stat. 273. December 2326. Anchorage off Pulu Jedan, East coast of Aru-islands (Pearl-banks). 13 m. Sand and shells. 1 adult ova-bearing female. Stat. 310. February 12. 8°3o'S., U9°7'.5E. Sapeh Strait. Ji m. Sand with few pieces of dead coral. 1 ova-bearing female. Stat. 315. February 17/18. Anchorage East of Sailus Besar, Paternoster-islands. Depth up to 36 m. Coral and Lithothamnion. 1 young male. A remarkable new species of the Binnguiculatus group, distinguished, like Syn. quadridcns, by the ar mature of the óth abdominal somite. Frontal and antennal region in the adult female from Stat. 273, which is considered as the type, much resembling those of Syn. biunguiculatus (Stimps.) Cout. (vide: H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, PI. LXXI, Fig. 8). Rostrum short, subacute, about 3-times as long as wide in the middle, its upper margin obtuse and appearing, in a lateral 153 SIBOGA-EXPEDITIE XXXIXrt1. 37 286 view, slightly concave-, the rostrum, which measures i/9 of the visible part of first antennular article, does not yet reach to the middle of it. Lateral spines as long as the rostrum, rather obtuse at the tips and slightly wider at their base than they are long ; notches between the lateral spines and the rostrum rather narrow, the distance between the tip of the rostrum and that of a lateral spine being distinctly shorter than the width of the lateral spines at their base. The three frontal spines bear a few setae at their tips. In the adult specimen from Stat. 1 64 the rostrum is still shorter, measuring only one-third the visible part of first antennular article. Antennular peduncle 5-times and its second article one and a half as long as wide at the distal end of the latter; the visible part of basal article is one and a half as long as the second and the second a little longer than the third. In the typical specimen from Stat. 273 the stylocerite reaches just beyond the middle of second article, in the specimen from Stat. 164 almost to the middle. Carpocerite slender, 5,1 — 5,3-times as long as wide in the middle, projecting beyond the antennular peduncle by two-thirds or three-fourths the distal article ; lateral spine of basicerite a little shorter than the stylocerite, though reaching beyond the first antennular article; spine at the upper angle well-developed, measuring one-fourth the length of the lateral. Terminal spine of scaphocerite reaching almost to the tip of antennular peduncle, projecting but for a short distance beyond the scale which is narrow and which extends to the middle of third article ; the terminal spine is separated from the scale until to the distal fourth part of basal article. The outer angles of the posterior margin of the óth abdominal somite are produced int o an acute, spiniform tooth, which is about as long as the spinules of the upper surface of the telson and directed backward and slightly outward ; at either side of the middle the posterior margin carries a n o t h er triangular tooth, which is directed straightly backward. Between these two submedian teeth which are half as long as the outer ones, the posterior margin is straight; but those parts of the margin that are situated between the outer and the submedian teeth are arcuate, the submedian teeth being separated from them by a triangular notch. The telson closely resembles that of Syn. biunguiculatus, the measurements (Table A) are the same, excepting that in that species the telson appears comparatively somewhat wider at its base; the spinules of the upper surface, 0,35 mm. long, measure also one-eighth the length of the telson. Posterior margin moderately prominent, not semicircular, outer angles acute, but not at all prominent, very small ; the meclian part of the posterior margin is as long as the outer spinules, while the inner spinules reach far. beyond it. Merus of large cheliped in the adult female from the Jedan Islands just twice as long as wide, in the adult specimen from Stat. 164 the proportion is 2,24; upper margin unarmed at apex, in the young male, long 10 mm. from Stat. 315, the upper margin terminates, however, in a triangular, rather acute tooth. Relative dimensions of the larg-e chela: fingers 1 ; total length 3,77 — 3,8; height 1,39 or 1,38. This chela appears therefore 2,72 — 2,75-times as long as high and the anterior margin of the palm terminates in a small rounded tubercle, which is somewhat ffattened above; in the young specimen from Stat. 315 this tubercle is rather acute. Proportion between the length of the large and that of the small chela 2,7, the latter is just as long as the large chela is high. Merus of small cheliped 3,2 — 3, 5-times as long as 154 >87 wide, unarmed at the apex of the upper margin. The relative dimensions of the smal] chela are: fingers i ; total length 3 — 3,2; height 0,86 — 0,93, anti this chela is 3,42 — 3,46-times longer than high, showing a slightly more" slender form than that of Syn. öiunguiculatus. Fingers as in this species, tapering, glabrous above, outer margin of the dactylus fringed with rather long, stiff setae from the articulation to the tip. Merus of second legs in the adult female from the Jedan Islands 4,3-times, in that from Stat. 164 4,75-times longer than wide. First segment of the carpus 3,7-, respectively 4-times as long as thick distally, as long as the sum of the four following and scarcely a little longer than the chela, the fingers of which are nearly one and a half as long as the palm ; the second, the third and the fourth segment are subequal and the fifth appears one-third longer than thick. The relative dimensions of the third legs agree also much with those of Syn. öiungui- culatus (Cout.). As results from Table B, the merus appears, in the adult specimens from the stations 164 and 310, a little longer with regard to the carpus than in the adult female from the Jedan Islands and in the young male from Stat. 3 1 5 the propodus appears a little longer and a little more slender : these differences are no doubt individual. The propodus is armed with eight spinules, in the adult female from Stat. 273 0,16—0,17111111. long, in the young male from Stat. 315 there are only six spinules long 0,09 — 0,11 mm. Measured from the base of the anterior margin to the tip of the ventral hook, the dactylus proves to measure in the adult female from Stat. 273 one-sixth the length of the propodus and to be nearly twice as long as broad near the articulation ; in the specimen from Stat. 1 64 and in the young male from Stat. 3 1 5 the dactylus measures little more than one-seventh of the propodus. The ventral hook, i. e. its anterior margin, is directed perpendicularly to the posterior border of the dactylus, the dorsal hook is a little longer and a little more slender than the other and the notch between both hooks is concave, not sharp at its base. Ova rather numerous, large, those of the female from the Jedan Islands 1,46 — 1,53111111. long, those of the female from Stat. 310 are 1,24 mm. long. The female from Stat. Stat. 310 16 mm. ■/ ó is 23111111. long, that from Stat. 164 20 mm. and that from Table A. Proportion between the length of the telson and the width of the posterior margin Proportion between the width at base and that of the posterior margin . Proportion between the length of the telson and the distance of the anterior pair of spinules from the posterior margin Proportion between the distances of either pair from the posterior margin Table B. f Merus Relative dimensions of \ Carpus ' Propodus Proportion between the length of the merus and that of the propodus Proportion between the length and the width of the merus . Proportion between the length and the width of the propodus . N° 1. N» 2. N° 3. N° 4. of third lecrs 3.2 3,28 3,4' 3,3i 2,1 2,1 2,21 2,1 •.4 i,43 1,52 1,56 1,47 i,55 i,5 1,6 No 1. N" 2. N»3- N» 4. 2,65 2,34 2,74 2,5 I I I I 1,65 1,6 1,8 1,96 i,6 ',47 1,52 1,27 3,63 3,55 4 4 5 4,7 5 5,8 N° 1 Stat. 164; X" 2 Stat. 27 N" 3 Stat. 310; N" 4 Stat. 315. 155 288 f37- Synalpheus trispinosus de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 300. Stat. 51. April 19. Madura-bay in the southern part of Molo-Strait. 70 m. Fine grey sand. 1 adult ova-bearing female and 1 younger specimen. An interesting new species of the Biunguiculatus group characterized, like Syu. triacanthus, by the posterior margin of the 6th abdominal somite being trispin o se. Frontal region rather prominent, like in some species of the Comatularum group ; rostrum slender, commencing with a rather obtuse carina at the anterior fourth of the carapace and reaching to just beyond the first antennular article, with the acuminate tip curved upward. Immediately posterior to the base of the rostrum one observes, in the median line of the carapace, an oval impressed point. Lateral spines also slender and acuminate, reaching to the middle of the visible part of first antennular article, directed straight forward and upward, so that the tips of these spines are lying in a higher plane than the tip of the rostrum. Antennular peduncle 4,5-times longer than wide or thick at the distal end of median article ; the visible part of the first article, the second and the third are in proportion to one another as 16:11:8, the visible part of the first being almost one and a half as long as the second and twice as long as the third ; the second article is almost one and a half as long as wide distall)'. Stylocerite as long as the rostrum, just reaching beyond the end of basal antennular article; the stylocerite and the three frontal spines are setose at their tips. Carpocerite 6,5-times longer than wide in the middle, when measured at the lower side, and as long as the antennular peduncle. The lateral spine of the basicerite is slightly turned outward at the tip, clearly shorter than the stylocerite, though almost as long as the basal antennular article; spine at the upper angle well-developed, half as long as the lateral spine. The terminal spine of the scaphocerite is a little longer than the two peduncles and only for a short distance surpasses the tip of the scale, which appears but a little shorter than the antennular peduncle. Sixth abdominal somite 1,6-times as wide as long in the middle, the median spine excluded; the posterior margin is armed with three acute spines, the two at the outer angles directed a little outward and a little longer than the spine in the middle. Telson a little more than twice as long as the sixth somite, the median spine excluded, 2,47-times as long as the posterior margin is wide, proportion between the width at base and that of the posterior margin 1,53. Posterior margin as in Syu. acanthitelsonis Cout., outer angles produced into large triangular spines that just reach beyond the moderately prominent, median part of the margin, spinules on the posterior margin subequal, nearly as long as the spines at the angles. Spinules of the upper surface implanted near the lateral margins, of moderate length, those of the posterior pair 0,35 mm. long, one-ninth the length of the telson, those of the anterior pair 0,3 mm. long; the anterior pair is implanted in front of the middle, the proportion between the length of the telson and the distance of the anterior pair from the posterior margin is indicated by the number 1,78 and the proportion between the distances of either pair from the posterior margin by the number [,7, while the distance between the posterior pair and the posterior margin is just one-third the length of the telson. 156 289 The merus of the large cheliped of the female is 1,83-times as long as wide, upper margin unarmed at apex, but the inf er o-extern al and the infero-internal margin carry an acute tooth at the distal end. Relative dimensions of the large chela: fingers i; total length 4,3; height 1,53, this chela being 2,8-times as long as high. Anterior margin of the palm terminating in a rather large, conical, though obtuse tooth or tubercle that is directed obliquely upward, upper surface of this tooth setose. Merus of small cheliped 2,7-times longer than wide, the three margins unarmed at apex. Proportion between the length of both chelae 2,1. Relative dimensions of small chela: fingers i; total length 2,64; height 0,95, this chela being 2,76-times as long as high. Dactylus slender, tapering, with a few scattered setae above and near the margins. Second legs rather slender. Merus 6,8-times longer than wide; first carpal segment 6,55- times longer than thick at the distal end, 1,31-times as long as the sum of the four following; the second, the third and the fourth segment are equal, slightly longer than thick. The proportions of the third pair are: merus 2,38; carpus i; propodus 1,87, the merus 1,27-times longer than the propodus. Merus rather stout, 3,36-times as long as wide, its posterior margin armed, from the proximal articulation to the distal fourth, with nine short, stout spinules, that are 0,14 — 0,18 mm. long. Propodus 5,3-times as long as wide, armed with nine spinules, which are 0,15 — 0,17 mm. long. Taken from the proximal extremity of the anterior margin to the tip of the ventral hook, the dactylus measures almost one-seventh the length of the propodus and it is about half as wide near the articulation as long. Ventral hook twice as long as broad at its base, its anterior margin perpendicular to the posterior border of the dactylus, which border the ventral hook rejoins by a concave curve of short radius ; dorsal hook a little longer, both hooks slightly divergent, notch between them concave at base. Merus of fourth pair with seven spinules, similar to those of the third. Ova rather numerous, 0,8 — o,8S mm. long. Length of ova-bearing female 19,5 mm. f38. Synalpheus septemspinosits de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 297. Stat. 315. February 17/18. Anchorage East of Sailus Besar, Paternoster-islands. Depth up to 36 m. Coral and Lithothamnion. 1 specimen. A new species of the Biunguiculatus group, related to Syn. pachymeris Cout. and to Syn. bituberculatus de Man, but distinguished from all other species of this genus by the armature of the sixth abdominal somite. Rostrum subacute. tolerably slender, 5-times as long as wide in the middle and reaching almost to the middle of the visible part of first antennular article ; lateral teeth triangular, subacute, a little more than half as long as the rostrum and one and a half as wide at their base as they are long; the outer margin of the lateral teeth is distinctly concave and the tips of these teeth that are directed straight forward and not upward, are slightly setose. Notches between the rostrum and the lateral teeth wide, just as wide anteriorly as they are long. '57 290 Antennular peduncle rather slender, 5,4-times longer than wide at the distal extremity of median article ; visible part of basal article one and a half as long as the second and twice as long as the thircl article, second article one and a half as long as wide distally. Stylocerite reachingf to the distal extremity of basal article. Carpocerite as slender as the antennular peduncle, 5,65-times longer than wide in the middle, projecting beyond the antennular peduncle by the whole length of third article; lateral spine of basicerite slightly turned outward, longer than the stylocerite, almost reaching to the middle of median antennular article, upper spine well-developed, measuring one-fourth of the lateral or inferior. Terminal spine of scaphocerite reaching to midway between the tips of the antennular and antennal peduncles and projecting almost by half its length beyond the narrow scale that reaches to the distal end of median antennular article. Syn. septemspinosus is characterized by the posterior margin of the sixth abdominal somite being armed with seven acute spines; the largest are the spiniform teeth at the outer angles, another spine, half as long, is observed in the middle of the margin and between this spine and the external ones occur at either side two other teeth, one, as large as the median tooth, midway between it and the external tooth, the other placed either near the median tooth or near the other submedian : of these two teeth namely, which are the smallest of all, the right is placed just near the other submedian tooth, the left just near the median tooth, but this is, of course, an abnormality. Telson 3-times as long and twice as wide anteriorly as the posterior margin is broad; the latter is not much prominent, its outer angles are acute, though very short, and the longer inner spinules, that show exactly the same length as those of the anterior pair of the upper surface, project by half their length beyond the posterior margin. Anterior pair of spinules 0,2 mm. long, implanted far before the middle, the proportion between the length of the telson and the distance of the anterior pair from the posterior margin being 1,44; posterior pair 0,23 mm. long, just one-ninth the length of the telson, proportion between the distances of either pair from the posterior margin 1,92, the two pairs being rather far remote from one another. Merus of large cheliped 2, 3-times longer than wide, upper margin terminating in an acute tooth. Relative dimensions of the large chela : fingers i; total length 3,9; height 1,54, this chela being 2,5 3-times longer than high; like in Syn. bituberculatus de Man, the anterior margin of the palm terminates in two tubercles; of these tubercles that are directed straight for- ward and subacute, the inner is twice as large as the outer. Merus of small cheliped 3-times longer than wide, upper margin unarmed at apex. Large chela 6,28 mm. long, 2,45-times as long as the other. Relative proportions of the small chela: fingers i; total length 3,2; height 1, this chela 3,2-times as long as high. The dactylus, that has a rather stout form, though it is tapering and not dilated, carries several tufts of setae near the outer and inner margins and several setae occur also on the outer face of the palm near the base of the immobile finger. Second and following legs of a stout shape. Merus of second legs 3,6-times longer than wide. First segment of the carpus 2,32-times as long as thick distally, the four following taken together 1,38-times as long as the first; second, third and fourth segment equal; chela 15S 291 almost as long as the sum of the four last segments, fïngers a little longer than the palm. The third legs closely resemble those of Syn. pachymeris Cout. (H. Coutière, Alpheidae Mald. and Lacc. Archip. 1905, PI. LXXI, Fig. 9^). The relative dimensions are: merus 3-, carpus 1 ; propodus 1,84 and the merus is 1,62-times as long as the propodus. Merus 3,4-times longer than wide, armed on the distal half of the posterior margin with e i g h t movable, slender spinules and with several setae ; between the third spinule and the carpal articulation the posterior margin is divided into an outer and an inner portion, the fourth to eighth spinules occur on the inner, while the outer portion is setiferous; the five larger spinules are 0,15 — 0,2 mm. long. Propodus 4,3-times longer than wide, with eight spinules that are of a somewhat stouter form than those of the merus and 0,13 — 0,15 mm. long. Dactylus small, one-seventh the length of the propodus and twice as long as broad; ventral hook one and a half as long as broad at its base, its anterior margin almost perpendicular to the posterior border of the dactylus, dorsal hook one and a half as long as the other, notch between both hooks concave at the base. Merus of fourth legs unarmed. Length 12,5 mm. f 39. Synalpheus neptunus (Dana). Alpheus neptunus J. D. Dana, U.S. Explor. Exped. Crustacea, p. 553, PI. 35, Fig. 5nd k N» 1. NO 3 5,75 5,6 0,93 1,1 1 5,4 4,3 Table C. ! Merus Carpus Propodus Proportion between the length of the merus and that of the propodus Proportion between the length and the width of the merus .... Proportion between the length and the width of the propodus . . . N° 1 adult male from Amboina (private collection); N° 2 adult ova-bearing female from Stat. 164; N° 3 young specimen from Stat. 154. General distribution1): Amboina (de Man); Bay of Batavia (Pulo Edam and Pulo Noordwachter) (de Man). No 1. No 2. NO 3. 2 2,28 2,17 I I 1 of third legs ■ i,4 i,45 1,48 1,54 1,64 1,32 3,i 3-3 3,6 4,5 4,45 5,3 1) It seems to be impossible to decide which are the species that have been referred to Syn. biunguiculatus by Borradaile. Lenz and Nobili. Theiefore the localities mentioned by these authors have been omitted. 165 298 742. Synalpheus Pescadoretisis Cout. Synalpheus Pescadorensis H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 877, PI. LXXIII, fig. 15. Stat. 96. June 27. South-east side of Pearl-bank, Sulu-archipelago. 15 m. Lithothamnion- bottom. 1 male and 1 ova-bearing female. Stat. 282. January 15/17. S°25'.2S., I27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 specimen. The female from Stat. 96 is almost 1 1 mm. long, the ova are not numerous, small, 0,58 — 0,62 mm. long. Rostrum and frontal spines setose at their tips, the rostrum very slightly longer (in Coutière's specimens shorter) than the frontal spines and measuring a little more than one- third the length of the visible part of basal antennular article ; outer margin of frontal spines slightly concave. Median antennular article slightly more than half as long as the visible part of the first, third article as long as the second. Stylocerite acuminate, just as long as the first article. The carpocerite extends almost by the length of third article beyond the tip of the antennular peduncle, the lower spine of the basicerite reaches almost to the middle of the second article; the terminal spine of the scaphocerite is as long as the antennular peduncle, while the scale reaches to the 2nd third part of the distal article (in Coutière's specimens only to the middle of the second) ; upper spine of basicerite as large as in the type. The telson which is 3,55-times as long as the posterior margin is wide, accords with Coutière's figure, but the median lobe of the posterior margin is less prominent ; the internal spinules, that are 0,29 mm. long, are but a little shorter than the posterior margin is broad and the width of the latter is just one- third the width at the base. The spinules of the anterior pair, long 0,23 mm., are placed far before the middle, the proportion between the length of the telson and the distance of these spinules from the posterior margin being 1,6; the proportion between the distances of both pairs from the posterior margin is 1,92 and the spinules of the posterior pair are 0,28 mm. long, longer than those of the anterior, as in Coutière's figure 15 e/. The outer angles of the posterior margin of the sixth abdominal somite are acute or spiniform. Merus of large cheliped of the female 2,36-times longer than wide, upper margin unarmed, infero-internal margin with an acute tooth at the apex. The large chela shows the following relative dimensions: fingers 1; total length 4; height 1,56; the obtuse tubercle at the anterior border of the palm carries a small acute spinule and at the outer side of this tubercle there is still another smaller one that is obtuse. Merus of seconcl legs 5,4-times longer than wide. The first carpal segment, 3,31-times longer than thick, is a little shorter than the sum of the four following and the chela, the fingers of which are one and a half as long as the palm, appears hardly longer than the first segment. The relative dimensions of the third legs are: merus 2,72; carpus i; propodus 1,85; the merus is 3,8-times longer than wide, according to Coutière only a little more than 3-times and the propodus which bears 9 short spinules, long 0,095 mm., 4,72-times. Taken from the proximal extremity of the anterior margin to the tip of the ventral hook, the dactylus measures just one-sixth the propodus; the dactylus, twice as long as wide at its base, accords with the 166 299 figure 15c of the original description; the dorsal hook, longer than the other and almost as thick at its base, is curved and regularly tapers to the extremity ; the ventral hook has a stouter form and, as in Syu. neptunus, its anterior margin runs like a S. The proportion between the length of the merus and that of the propodus is 1,47, according to Coutière 1.6. With regard to the specimen, long 8 mm., from Stat. 282 the following must be observed. The median antennular article is a little shorter than in the preceding specimen, being a little less than half as long as the visible part of the first and the third is one and a half as long as the second; the stylocerite of the left peduncle extends just beyond the first article, but that of the right is as in the type. The terminal spine of the scaphocerite, though shorter than the carpocerite, much surpasses the antennular peduncle and the scale reaches, like in the preceding female, to the 2nd third part of the third article. Frontal spines as in the preceding female. The relative dimensions of the third pair of legs are: merus 2,52; carpus 1 ; propodus 1,77; the merus is 4-times, the propodus 5,4-times longer than wide, appearing in this younger specimen a little more slender than in the older one and the proportion between the length of the merus and of the propodus is 1,42. The propodus bears six spinules and the dactylus measures a little more than one-sixth of it. General distribution: Maldive and Laccadive Archipelagoes (Coutière) ; Pescadores (Coutière). Alpheus Fabr. The genus Alpheus Fabr. is represented in this collection by no less than 54 species and 8 varieties, of which 20 species and all the varieties proved to be new to science ; the varieties all belong to known species. Moreover 3 species and 2 varieties were collected, that are left unnamed, while also a new variety is described, which was not taken by the "Siboga". A rich harvest indeed, a large contribution to the knowledge of this interesting genus, especially when we take in consideration that the old genus Alpheus Fabr. has been some time ago discharged of many species that are at present included in the genus Synalpkeus. The total number of indopacific species of Alpheus therefore now amounts to 124, besides 4 that are unnamed, while at present 19 varieties are known, 2 of which are still unbaptized. The 34 already known species, obtained by the "Siboga", constitute about one-third of the total number of indopacific species, with which we were up to the present acquainted. Of these 34 species 15, i. e. 44°/0i are widely-ranging forms, distributed throughout the whole Indopacific. These species are the following : A. collumianus Stimps. A. ventrosus H. M.-Edw. A. macrochirus Richt. A. Alcyonc de Man. A. spongiaruiu Cout. A. pachychirus Stimps. A. frontalis H. M.-Edw. A. Lutini Cout. A. insignis Heller. A. gracilipcs Stimps. A. Mi er si Cout. A. Audouini Cout. A. strenuus Dana. A. pacificus Dana. A. parvi-rostris Dana. 167 300 Of these 34 species only 1 1 have hitherto been moreover observed in the seas west of the Indian Archipelago, in the Indian Ocean, the Persian Gulf, the Red Sea etc. They are the followingf : A. paradentipcs Cout. A. paralcyone Cout. A. paraculeipes Cout. A. mier osty lus (Sp. Bate). A. rapax Fabr. A. barbatits Cout. A. macrosceles Alc. & Anders. A. crassimanus Heller. A. pareuchirus Cout. A. Hippothoè de Man. ? A. euchirus Dana. Four other "Siboga" species have moreover only been observed in the Pacific, viz : A. acuto-femoratus Dana. A. malleodigitus (Sp. Bate). A. edamensis de Man. A. leviusculus Dana. Of the 4 remaining species A. bidens (Oliv.) has, as far as I am aware, not yet been observed outside the Indian Archipelago; A. chiragricus H. M.-Edw. is also known with certainty from Hongkong and from the Mergui Archipelago, while A. Euphrosyne de Man and A. microrhynchus de Man occur also in the Gulf of Siam (Bangkok). The indopacific species which have not been collected by this expedition, amount to 70 besides one unnamed form belonging to the Megacheles group, 9 varieties also have not been obtained. Of these 70 species A. architectus de Man occurs at Atjeh, A. Ehlersi de Man in the Bay of Batavia and A. funafutensis Borr. either also in the Bay of Batavia or off Amboina, while the new variety angustidigitus of A. brevirostris (Oliv.) was taken at Balikpapan, East coast of Borneo : these four must therefore be included in the Fauna of the Archipelago. The following 8 or 9 ought very probably also to be added to that Fauna, viz. : A. Seurati Cout. A. villosus (Oliv.). A. paragracilis Cout. A. aglaopheniae Borr. A. crinitus Dana. A. cristatus Cout. A. mi f is Dana. ? A. distiuguendus de Man. A. macrodactylus Ortm. Of these species, namely, 2 viz. A. Seurati and A. paragracilis have been observed both in the Indian and in the Pacific Oceans, A. aglaopheniae occurs at the south-eastern extremity of British New Guinea, A. cristatus at Thursday Island, A. villosus, besides at the island of Reunion, also on the north coast of Australia and on the coast of British New Guinea, A. crinitus and A. mitis inhabit the Strait of Balabac, while A. macrodactyhis, observed as well at Sydney as on the coast of Annam, certainly once will prove to occur in the Archipelago. As regards the japanese A. distinguendus, it is still doubtful whether this form also occurs in the river near Pare-Pare, Celebes, or not. Of the 70 species and the 9 varieties not obtained by this expedition, 42 resp. 6 have up to the present time only been observed in the seas west of the Archipelago, in the Indian Ocean, the Persian Gulf and the Red Sea. These species are the following : 168 A. stapkylinus Cout. A. Hailstonei Cout. A. den ter opus Hilgd. A. Malhaensis Cout. A. sp. Cout. 1905. A. A)iiirantei Cout. A. gracilis Heller. A. graci/is Heller var. Alluaudi Cout. A. splcndidus Cout. A. Shcarmci Alc. & Anders. A. idiocheles Cout. A. pcrsicus Nob. A. phrygianus Cout. A. Danae Cout. A. baculifcr Cout. A. Providencei Cout. A. bucephaloides Nob. A. longecarinatus Hilgd. A. bucephalus Cout. A. bradypus Cout. A, styliceps Cout. A. clypcatus Cout. A. superciiiaris Cout. A. Adamastor Cout. A. Stanleyi Cout. A. ovaliceps Cout. A. Percyi Cout. A. dasycheles Cout. A. Lanccloii Cout. A. Coetivensis Cout. A. paracrinitus Miers. A. paracrinitus Miers var. bengalensis Cout. A. alpheopsides Cout. A. paralphcopsides Cout. A. djeddcnsis Cout. A. djiboutensis de Man. A. rapax Cout. 1905. A. bis-incisus de Haan var. Jlfaiensis Cout. A. hoplocheles Cout. A. Bouvier i A. M.-Edw. A. Bastardi Cout. A. Edwardsi Aud. A. leptochirus Cout. A. strenuus Dana var. angulatus Cout. A. bis-incisus de Haan var. stylirostris Cout. A. Bouvieri A. M.-Edw. var. Hululensis Cout. A. Maindroni Cout. A. malabaricus Fabr. A. Perezi Cout. In the Pacific and in the seas of Japan and New Zealand 16 species and 2 varieties occur that are not yet observed elsewhere, they are the following : A. socialis Heller. A. tryplwpus Nob. A. brevipes Stimps. A. obeso-manus Dana. A. obeso-mamis Dana var. japonicus Ortm. A. diadema Dana. A. novae-zelandiae Miers. A. pugnax Dana. A. brevirostris (Oliv.). A. brevicristatus de Haan. A. Halesii Kirk. A. bis-incisus de Haan. A. japonicus Miers. A. Haanii Ortm. A. malabaricus Fabr. var. dolichodactylus Ortm. A. hoplites Nob. A. euchiroides Nob. A. lobidens cle Haan. Accordinor to Coutière A. macrochirus Richt, should occur also on the west coast of o Africa (Congo) and in the Gulf of California, while A. Bouvieri A. M.-Edw. is also distributed from the Azores to the Gaboon and occurs at Panama. 169 SIBOfiA-EXPEDITIE XXXIXa'. 39 We have shown in the preceding lines that of the 34 old species obtained by this expedition 44% range throughout the whole Indopacific Region but that of the 70 that were not obtained, only 2 viz. A. Seurati and A. paragracilis are as widely distributed. In con- nectión now with the fact that the Indian Archipelago is situated just midway between the western and the eastern parts of the Indopacific Region, we may draw the conclusion that, as a general rule, the range of the remaining 68 species will prove to be rather limited, a con- clusion apparently in harmony with what we know about the distribution of several species described long ago. So e. g. A. socia/is, A. novae-zelandiae, A. brevirostris and A. Halesü are confined to the seas of New Zealand and of South-eastern Australia, while the seas of Japan are inhabited by A. obcso-manus var. japonicus, A. brevicristaitis, A. Haanii, A. japo- niczis, A. malabaricus var. dolichodactylus and A. lobidens. Three species viz. A. architectus, A. EJilersi and A. funafutensis, as also the variety angustidigitus of A. brevirostris (Oliv.), are known to occur in the seas of the Archipelago though not elsewhere and 6 or 7 other ones are probably also confined to these seas. These 19 or 20 species constitute almost one-third of the total number not observed by this expedition, so that we may conclude that the distribution of the numerous species hitherto only observed west of the Archipelago and of the few still only known from Polynesia (A. tryphopus, brevipes, obcso-manus, diadema, pugnax, hoplites and euchiroides) will in general prove to be rather limited and more or less confined to the areae in which they have been diseóvered. Though this conclusion as a general rule may perhaps be regarded as correct, it cannot be denied that in consequence of further research some of these species afterwards will prove to be more widely distributed than is known at present. The very natural division of this genus into five groups, the third of which is again subdivided into three subgroups, a division proposed by Professor Coutière in his valuable paper on the Alpheidae of the Maldive and Laccadive Archipelagoes, is also accepted in this work. In the Mcgacheles group, besides 2 known species, 2 new varieties of A. Hailstonei were obtained, which are of some interest because in one of them the dactyli are simple like in the type species, but in the other biunguiculate. The remarkable Macrochirus group is represented by 3 known species, by one which is new and by a variety of a Red Sea species (A. gracilis) : the new form closely approaches to A. splendidus Cout. from Djibouti, but it differs by the lateral frontal spines arising from the anterior margin of the front and not from the upper surface of the orbital hoods. It is to this group that has been referred A. acuto-femoratus Dana obtained on the reefs off Sawan, Siau- island and on the west coast of Gebé-island, a rare species with which A. parabrevipes Cout. proved to be identical. In the Obcso-manus group, the first subdivision of the group Criuitus, 2 species were obtained which have been diseóvered by the " Challenger" and of each of them a new variety was collected ; the third is A. Lutiui, distributed throughout the whole Indopacific and, finally, South of Saleyer a remarkable form was captured which, probably also belonging to this sub- group, differs from all its species by the dactyli being biunguiculate. The group Crinitus s. s. is represented by 10 species, 4 of which are new and by a new variety of A. Stanleyi. Of these 4 species one is closely related to A. bucephalus Cout. and to A. elypeatus Cout., the 170 characters of this species are intermediate between those of these two Alphei. Two other species closely approach to A. styliceps which also inhabits the Maldive and Laccadive Archipelagoes and the fourth is a form of small size allied to A. longecarinatus. Three species known already long ago and 5 new ones are representing the subgroup Insignis Cout., that connects the Cr in Hits and Brevirostris groups with one another. The new A. praedator is interesting, as it bears, just as A. öidens, at each side of the rostral carina, a pointed tooth and A. bicostatus, which is related to A. cristatus from Torres Straits, is also a remarkable form. A. Philoctetcs is another new species apparently allied to A. Lanceloti, but its true position is doubtful, because the larger cheliped is missing in the single specimen. Two new species, A. tenuicarpus and A. tenuipes, as also an unnamed form, are characterized by their three posterior legs being very slender. No less than 10 species of the Brevirostris group, 6 of which are new to science, were collected by this expedition. One of the old species is the well-known A. rapax Fabr., two adult specimens of which were captured off Nusa-Laut-Island : this species probably ranges throughout the whole Indian Ocean. At a much greater depth than the other species an egg-bearing female was captured, which with some doubt is referred to A. macrosceles. Different from the latter, in almost all the new species of this group the rostral carina is more or less prominent and continued to the middle or even beyond the middle of the carapace ; the new A. acuto- carinatus approaches to A. macrosceles by the slender form of the thoracic legs. The Edwardsi group, finally, the largest of all, is represented by 17 species, 4 of which are new, by 4 new varieties and by a species that did not yet receive a specific name. The new A. proseuchirus agrees with A. öis-incisus by the flattened form of the rostrum, but it differs by the larger chela being hardly emarginate on the lower border and by the very slender shape of the three posterior legs. A. Coutier'ei is chiefly characterized by the prominent rostral carina, continued beyond the posterior third of the carapace. About the very remarkable A. Polyxo, the dactyli of which are biunguiculate, I must observe that its place in this group remained doubtful because, unfortunately, in both specimens the larger cheliped is wanting. The new variety imitatrix of A. pareuchirus is noteworthy because the dactylus of the smaller chela presents the Balaeniceps-form not only in the male but also in the female, imitating, as regards this character, the long-known A. strenuus. Several new species are only represented by one, two or three specimens, a fact perhaps fortuitous, perhaps due either to the rarity of these species or to their manner of life : we know indeed through the observations of Coutière, that some species are living in sponges or between the corals of the reefs, in deep holes bored by mollusks or under stones. As regards the bathymetrical distribution we must in the first place draw the attention to the fact that of more than one-third of the species, exclusive of course of the new forms collected by this expedition, nothing is known about the depth at which they have been obtained. As a general rule the species of this genus are living in shallow water, for more than half the number of all the indopacific species of Alpheus, inclusive those obtained by this expedition, have been observed at depths not greater than 30 fathoms or 54 meters; some of these species, namely those that were captured in the Maldive and Laccadive Archipelagoes 171 3°4 and described by Coutière in 1905, have perhaps been taken, for a part, between 30 and 50 fathoms. Some species have been obtained at a somewhat greater depth not exceeding, however, 150 m., except 2 or 3 that are living in considerably deeper water. These are, in the first place, A. Shearmei Alc. & Anders., the unique specimen of which was collected off the Travancore coast at a depth of 430 fathoms. The second, A. macrosceles Alc. & Anders., has been observed in the Bay of Bengal in water of 193, 145 — 250 and 270 fathoms and in the Andaman Sea, at a depth of 188 — 220 fathoms: the egg-bearing female, which was taken at Stat. 5 and referred with some doubt to this species, was obtained at a depth of 330 m., the bottom being mud. At a depth of 289 m., Stat. 12, another ovigerous female was collected, unfortunately in such a mutilated condition, that it remained doubtful whether it belongs to the variety leptopus of A. uialabaricus Fabr. or not. The other species taken in water deeper than 30 fathoms are the following : A. Hailstonei Cout. var. assimitlans de Man, 90 m., 113 m. and less. A. Hailstonei Cout. var. lactabilis de Man, 34 m., 70 m., 73 m. and from 400 — 120 m. A. Amirantei Cout., between 25 and 80 fathoms. A. Providencei Cout., between 50 and 78 fathoms. A. paralcyone Cout., 8 m., 45 m., 70111. and 113111. A. spongiarum Cout., 8 m., 13 m., 15111. and 113111. A. Eulimene de Man, 83 m. A. bidens (Oliv.), 13111., 83111. A. Percyi Cout., between 25 and 50 fathoms. A. dasycheles Cout., 37 fathoms. A. gracilipcs Stimps., 32 m., 83 m. A. teiuiicarpus de Man, 75 m. and less. A. sp. de Man, between 54 and 90 m. A. tcnuipes de Man, between 75 and 94 m. A. lepidtts de Man, 75 m. and between 54 m. and 90 m. A. Sibogae de Man, 70 m., 113 m. A. acutocarinatus de Man, 72 m. and less. A. prosettchirus de Man, 72 m., 75 m. A. pareuchirus Cout., 32111., 36111., 57 m. and 90111. A. pareuchirus Cout. var. Letuolhea de Man, 15 m., 70 m. and 54 — 90111. A. pareuchirus Cout. var. imitatrix de Man, 18 m., 32111., 113111. and 141 m. A. leptocliiroides de Man, 90 m. The new A. bicostatus de Man has been taken, besides on a bottom of coral, coralsand and Lithothamnion, also, in Buton Strait, between floating seaweed. The other species were taken in water, the bottom of which consisted of living or dead coral, coralsand, shells, Halimeda, Lithothamnion, often of black sand or mud or mud with sand. 172 3°5 List of all the Indopacific species of the genus Alpkeus Fabr., arranged ace or ding to their relationship, as indicated in the keys1). I. Megacheles group. staphylinus Cout. 1908. 'Hailstonei Cout. var. assimulans de Man 1908. Hailstonei Cout. 1905. 'Hailstonei Cout. var. laetabilis de Man 1908. Seurati Cout. 1905. deuteropus Hilgd. 1878. ■'collumianus Stimps. 1860. Malhaensis Cout. 1908. *paradentipes Cout. 1905. sp. Cout. 1905. II. Macrochirus group. villosus (Oliv.) 1789. paragracilis Cout. 1897. "acuto-femoratus Dana 1852. Amirantei Cout. 1908. gracilis Heller 1861. •gracilis Heller var. luciparensis de Man 191 1. gracilis Heller var. Alluaudi Cout. 1905. architectus de Man 1897. socialis Heller 1865. *ventrosus H. M.-Edw. 1837. •facetus de Man 1908. splendidus Cout. 1897. Shearmei Alc. & Anders. 1899. 5 macrochirus Richt. 1880. aglaopheniae Borr. 1899. idiocheles Cout. 1905. III. Crinitus group. III a. Obeso-manus subgroup. obeso-manus Dana 1852. *microstylus (Sp. Bate) 1888. amicrostylus (Sp. Bate) var. 191 1. *Lutini Cout. 1905. obeso-manus Dana var. japonicus Ortm. 1890. persicus Nob. 1905. *malleodigitus (Sp. Bate) 1888. *malleodigitus (Sp.Bate) var. gracilicarpus de Man phrygianus Cout. 1905. [r9°9- Danae Cout. 1905. *sp. de Man 191 1. baculifer Cout. 190S. III b. Crinitus subgroup. ■Alcyone de Man 1902. Providencei Cout. 1908. 'Arethusa de Man 1909. "paralcyone Cout. 1905. !iiparaculeipes Cout. 1905- brevipes Stimps. 1860. crinitus Dana 1852. bucephaloides Nob. 1905. longecarinatus Hilgd. 1878. parvus de Man 1909. bucephalus Cout. 1905. consobrinus de Man 1908. bradypus Cout. 1905. *spongiarum Cout. 1897. Eulimene de Man 1909. styliceps Cout. 1905. elypeatus Cout. 1905. tryphopus Nob. 1906. superciliaris Cout. 1905. Adamastor Cout. 1908. ;6pachychirus Stimps. 1860. Stanleyi Cout. 1908. * Stanley i Cout. var. dearmatus de Man 19 10. ovaliceps Cout. 1905. *frontalis H. M.-Edw. 1837. r) The species collected by the "Siboga" are marked with an asterisk and the new species are printed in a more heavy type. 173 3o6 III c. Insignis subgroup. «bidens (Oliv.) 1789. *praedator de Man 190S. cristatus Cout. 1S97. bicostatus de Man 1908. *insignis Heller 1861. diadema Dana 1852. Percyi Cout. 1908. Philoctetes de Man 1909. pugnax Dana 1852. dasycheles Cout. 1908. Lanceloti Cout. 1905. Ehlersi de Man 1909. *gracilipes Stimps. 1860. Novae-Zelandiae Miers 1876. coetivensis Cout. 1908. mitis Dana 1852. paracrinitus Miers 188 1. paracrinitus Miers var. bengalensis Cout. 1905. alpheopsides Cout. 1905. paralpheopsides Cout. 1905. 'tenuicarpus de Man 1908. *sp. de Man 191 1. tenuipes de Man 1910. IV. Brevirostris group. "rapax Fabr. 1798. brevirostris (Oliv.) 1789. brevirostris (Oliv.) var. angustidigitus n. 191 1. brevicristatus de Haan 1849. s;barbatus Cout. 1897. djeddensis Cout. 1S98. djiboutensis de Man 1909. pubescens de Man 1908. savuensis de Man 1908. 'Miersi Cout. 1905. distinguendus de Man 1909. Halesii Kirk 1887. rapacida de Man 1908. lepidus de Man 1908. rapax Cout. 1905. *Sibogae de Man 1908. sacutocarinatus de Man 1909. *macrosceles Alc. & Anders 1894. V. Edzvardsi group. bis-incisus de Haan 1849. bis-incisus de Haan. var. Malensis Cout. 1905. *bis-incisus de Haan. var. variabilis de Man 1909. proseuchims de Man 1908. Coutierei de Man 1909. hoplocheles Cout. £898. Bouvieri A. M.-Edw. 1878. *leviusculus Dana. 1852. Bastardi Cout. 1905. *Euphrosyne de Man 1S97. ï:microrhynchus de Man 1897. japonicus Miers 1879. Edwardsi Aud. 1826. *Audouini Cout. 1905. 'chiragricus H. M.-Edw. 1S37. *crassimanus Heller 1865. *pareuchirus Cout. 1905. *pareuchirus Cout. var. Leucothea de Man 1909. leptochirus Cout. 1905. leptochiroides de Man 1909. Polyxo de Man 1909. *strenuus Dana 1852. strenuus Dana var. angulatus Cout. 1905. "'pareuchirus Cout. var. imitatrix de Man 1909. bis-incisus de Haan var. stylirostris Cout. 1905. Bouvieri A. M.-Edw. var. Hululensis Cout. 1905. Maindroni Cout. 1898. *pacificus Dana 1852. Haanii Ortm. 1890. macrodactylus Ortm. 1890. malabaricus Fabr. 1798. malabaricus Fabr. var. dolichodactylus Ortm. 1890. 'malabaricus Fabr. var. leptopus de Man 19 10. "•'parvi-rostris Dana 1852. hoplites Nob. 1906. "Hippothoë de Man 1888. *"euchirus Dana 1852. euchiroides Nob. 1906. funafutensis Borr. 1898. ''edamensis de Man 1888. Perezi Cout. 1908. *sp. de M. (near parvi-rostris Dana) 191 1. lobidens de Haan 1849. i74 3°7 Classification of the Species. As the result of his important researches Coutière has proposed the very natural division of the genus Alpkeus Fabr. into five groups : Mcgacheles, Macrochirus, Crinitus, Brevirostris and Ediuardsi, the third of which is again subdivided into three subgroups : Oóeso-iuanus, Crinitus s. s. and ïnsignis (H. Coutière, Les Alphéidae, 1899, P- 35 1 an<^ in: Alpheidae Mald. and Laccadive Archipelagoes 1905). These groups are characterized by him in the following way. Mcgacheles group. Lateral (extra-corneal) spines present. Larger chela more or less distorted vvith the margins grooved and notched and with the condylian crests very prominent and sharp : merus of 3rd legs dentate or unarmed, dactyli of three posterior legs simple or biunguiculate. Macrochirus group. Lateral (extra-corneal) spines usually present. Inferior spine of basicerite sometimes large. Larger chela usually longitudinally grooved or emarginate anteriorly. Merus of third legs usually unarmed, dactyli of three posterior legs biunguiculate or simple. External spine of exopod of caudal fan often black. Crinitus group. Lateral (extra-corneal) spines usually wanting. Larger chela more or less cylindrical, entire or with the upper border transversely grooved or with the alpheopsial grooves well marked, in the latter case the dactylus is hammer-shaped. Merus of third legs usually dentate. Dactyli of three posterior legs usually simple. Obeso-manus subgroup. Lateral (extra-corneal) spines wanting. Larger chela with the alpheopsial grooves well- developed and with the dactylus hammer-shaped. Merus of third legs very rarely unarmed. Dactyli of three posterior legs usually simple. Crinitus subgroup. Lateral (extra-corneal) spines wanting. Larger chela cylindrical, entire, without grooves or notches. Merus of third legs very rarely unarmed. Dactyli of three posterior legs simple or biunguiculate. ïnsignis subgroup. Lateral (extra-corneal) spines usually wanting. Larger chela with a transverse groove near the articulation of the dactylus or not. Merus of third legs dentate or unarmed. Dactyli of three posterior legs simple. i75 3o8 Brevirostris group. Lateral (extra-corneal) spines wanting. Larger chela quadrangular, compressed, often with longitudinal ridges, with a transverse groove near the articulation of the dactylus or not ; dactylus of larger chela of the male sometimes "Balaeniceps"-shaped. Merus of third legs usually unarmed. Dactyli of three posterior legs simple, lanceolate. Edivardsi group. Lateral (extra-corneal) spines wanting, very rarely (A. hoplites) orbital hoods acute. Larger chela usually more or less compressed, with both the upper and the lower margin emarginate and with grooves or depressions on the lateral surfaces. Dactylus of smaller chela of the male often "Balaeniceps"-shaped, rarely also that of the female. Merus of third legs unarmed or dentate. Dactyli of three posterior legs simple, very rarely [A. hoplites, A. Polyxó) biunguiculate. Key to the indopacific species and varieties of the genus Alphens Fabr Megacheles group. ax Merus of 3rd legs unarmed. ó} Dactylus of 3rd and following legs simple. cx Merus of 3rd legs 5-times longer than wide. Fingers of the smaller chela slightly shorter than the palm, which is 2,43-times as long as high stapliylimis Cout. (H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 1908, p. 14). c„ Merus of 3rd legs 9, 5-times longer than wide. Inner margin of the merus of the larger cheliped with 4 — 6 small spinules posterior to the spine at distal extremity. Fourth article of carpus of 2nd legs usually as long as the 2nd and as long as the 5111. Fingers of the smaller chela slightly longer than the palm. Larger chela in the male 2,58-times, in the female 2,76-times as long- as hio-h Hailstonei Cout. var. assimulaus de Man £3 Merus of 3rd legs 11-times longer than wide1). Inner margin of the merus of the larger cheliped unarmed posterior to the spine at distal extremity. Fourth article of carpus of 2nd legs as long as the 2nd and as long as the 5th. Fingers of smaller chela slightly shorter than the palm. Larger chela 3,33-times as long as high Hailstouci Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 879, PI. LXXIV, fig. 18). 1) This proportion is deduced fiom the figure. 176 309 óa Dactylus of 3rd and following legs biunguiculate. cl Merus of 3rd legs in the male 8-times, in the female 6,6-times as long as wide. Inner margin of the merus of larger cheliped with 8 or 9 spinules posterior to the spine at distal extremity. Fourth carpal article of 2nd legs shorter than 2nd and also than 5th. Fingers of the smaller chela a little shorter than the palm. Larger chela nearly as in A. Hailstonei Cout. . . . Haüstonei Cout. var. laetabilis de Man c„ Merus of 3rd legs 3-times as long as wide. Fourth carpal article of 2ud legs somewhat less than half as long as 2nd and also shorter than the 5th. Fingers of the smaller chela shorter than the palm. Larger chela with the palm ovoid, the immobile finger truncate and the dactylus falcate ; lower margin crenulate. . . Seurati Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 881, PI. LXXV, fig. 20). a3 Merus of 3rd legs with a spiniform tooth at distal extremity. Fourth carpal article of 2nd legs half as long as the 2nd and shorter than the 5th (also in A. Malhaensis?). bx Dactylus of 3rd and following legs simple. Fingers of the smaller chela hardly more than half as long as the palm, the latter one and a half as long as high deuteropus Hilgd. (F. HlLGENDORF, in: Monatsb. Berl. Akad. Wiss. 1878, p. S34, Taf. IV, Fig. 8). óz Dactylus of 3vd and following legs biunguiculate (also in A. Malhaensis ?). c1 Merus of 3rd legs less than 4-times as long as wide. d, Immobile fineer of the lar^e chela not truncate. Finkers of the smaller chela of the male as long or slightly longer than the palm, which is 1, 4-times as long as high colhtmianus Stimps. d2 Larger chela as in A. Seurati, but the lower margin smooth, the constriction between the palm and the immobile finger deeper and the extremity of the dactylus less massive. Measurements of 3rd legs: merus 1,9, carpus 1, propodus 1,25 Malhaensis Cout.1] (H. COUTIÈRE, in: Buil. Soc. Philom. Paris 1908, p. 15). c2 Merus of 3ld legs about 6-times as long as wide. Fingers of the smaller chela slightly longer than the palm, which is twice as long as high and armed with two acute teeth at the anterior margin. Larger chela 3-times as long as high. Carpus of 3rd legs with 3 movable spinules paradentipes Cout. The position of an unnamed species, described by Couttère (in : Alpheidae Malei, and Laccad. Archip. 1905, p. 882, PI. LXXIV, fig. 19), is doubtful and therefore this species is not included in the key of this group. 1) This species is rather incompletely known. In the short diagnosis nothing is said about the merus of the larger cheliped about the smaller cheliped, the three last carpal articles of 2nd legs and about the dactyli of the three posterior legs. 177 SIBOGA EXPEDITIE XXXIX ö'. 40 Macrochirus group. ax Merus of 3rd and 4th legs with an acute tooth at the distal extremity of posterior margin. <$] Lateral (extra-corneal) teeth present, very small. Between either of them and the rostrum the frontal margin bears another still smaller tooth. An acute median tooth on the rostral carina at the base of the eye-hoods. Carapace villose villosus (Oliv.) (H. Milne-Edwards, in: Hist. Nat. Crust. II, 1837, p. 354). b„ Lateral (extra-corneal) teeth wanting. £, Dactyli of three posterior legs biunguiculate. Lower spine of basi- cerite reaching almost to the extremity of median article. Lower border of the large chela notchecl, upper border without a trans- verse groove. First carpal article of 2lld legs more than twice as long as 2nd paragracilis Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 883, PI. LXXVI, fig. 22). c„ Dactyli of three posterior legs simple. Basicerite almost unarmed. Lower border of larger chela entire, upper border with a transverse groove. First carpal article of 2nd legs about one-third of 2lld. d} Longitudinal groove on the supero-external surface of larger chela well-developed, deep. Fingers of the small chela much shorter than the palm aatto-femorafusDana. d„ Longitudinal groove on the supero-external surface of larger chela very feeble. Fingers of the small chela as long as the palm. Amirantei Cout. (H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 1908, p. 15). a„ Merus of 3rd and 4th legs unarmed. bx Lateral (extra-corneal) teeth present. cï Dactyli of three posterior legs biunguiculate. dx Inferior spine of basicerite small, hardly reaching to the extremity of ist antennular article. 6', Larger chela not emarginate anteriorly, dactylus not hammer- shaped. Scale of scaphocerite not rudimentary, reaching to or almost to the extremity of antennular peduncle. ƒ, Larger chela not or quite indistinctly notched at the base of the immobile fingfer. Rostrum reachinsr to the middle of the visible part of ist antennular article. Movable spine of exopod of caudal fan brown. First carpal article of 2nd legs only slightly longer than the sum of the 2nd and the 3rd. gracilis Heller (C. Heller, in: Sitzungsber. Akad. Wiss. Wien, XLIV, 1861, p. 271, Taf. III, Fig. 19, 20). 178 I I fa Larger chela more distinctly notched at the base of the immobile finger. Rostrum reaching to the extremity of ith antennular article. Movable spine of exopod of caudal fan black gracilis Heller var. luciparensis n. arvus de Man). gx Rostral carina continued backward to beyond the middle of the carapace. Scale of scaphocerite as long as antennular peduncle. hx Carpus of 3rd legs armed with 3 or 4 spinules on its anterior margin, with 2 or 3 on its posterior. Terminal spine of scaphocerite as long as or slightly longer than the carpocerite. Second carpal article 1,6-times as long as the ist (G. NOBILI, in: Buil. Scientif. France et Belgique, XL, 1906, p. 29). //., Carpus of 3rd legs bearing three spinules on its posterior margin, but no ones on the anterior. Fingers of smaller chela, in the female, much shorter than the palm. Second carpal article twice as long as the ist. (F. HlLGENDORF, in: Monatsber. Akad. Wiss. Berlin, 1878, p. 833, Taf. IV, fig. 3 — 7) 183 paraaileipes Cout. brevipes Stimps. crinitus Dana bucephaloides Nob. longecariuatus Hilgd. 3i6 parvus de Man bucephalus Cout. hz Carpus of 3ld legs devoid of spinules both on the antenor and the posterior border. Fingers of smaller chela, in the female, hardly shorter than the palm, merus of smaller cheliped with a strong, slender, apical tooth at the infero-internal margin. Second carpal article 1,28-times longer than ist g% Rostral carina short, hardly reaching backward beyond the orbital hoods. hx Scale of scaphocerite as long as antennular peduncle. ix Dactylus of smaller chela in the male conical, not enlarged, measuring 7/8 of the palm. Second carpal article more than twice as long- as ist. Lenoth of telson in proportion to the width of its posterior margin as 9 : 4 (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip.1905, p. 890, PI. LXXVIII, fig. 29). i„ Dactylus of smaller chela in the male much broadened, half as broad as long, fingers slightly longer than the palm. Second carpal article in the male almost 3-times, in the female somewhat more than twice as long as the ist consobrinus de Man h„ Scale of scaphocerite rudimentary, shorter than 2nd antennular article. t, Second carpal article in the male 1,75-times, in the female 1,4-times as long as 2nd. Merus of 3rd legs 2,75-times as long as wide in the middle. Merus of smaller cheliped both in the male and in the female one and a half as long as wide .... bradypus Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 891, PI. LXXVIII and LXXIX, fig. 30). is Second carpal article twice or a little more than twice as long as ist. Merus of 3vd legs 5-, sometimes only 4-times as long as wide in the middle; internal posterior margin with 20 — 25 short setae, external with 3 — 8 longer ones. Dactyli of three posterior legs sometimes with a more or less distinct, accessory hook. Perhaps a variety of A. paraculeipes Cout. spongiarum Cout. d„ Fingers of smaller chela in the male longer than the palm, styli- form. Scale of scaphocerite rudimentary, reaching at most to the middle of 2nd antennular article. Second legs stout. Posterior margin of 6th abdominal somite unarmed in the middle. ex Frontal margin of carapace transverse at either side of the 184 3i7 rostrum which is very short. Merus of 3ld legs 4, i-times as long as wide in the middle, merus of 4th legs unarmed. . Eulimcne de Man e2 Rostrum not short, reaching beyond the middle of basal anten- nular article, frontal margin at either side oblique, convex. Merus of 3rd legs 3-times as long as wide in the middle, merus of 4th also with a tooth styliceps Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 889, PI. LXXVIII, fig. 28). c„ First carpal article of 2nd legs not shorter than 2nd. dy Fingers of smaller chela in the male shorter than the palm. e, First carpal article hardly longer than 2nd. Merus of 3rd legs at most 3,5-times as long as wide in the middle. fx Rostrum triangular, small, concave, curved upward, not carinate ; rostral carina arising, just behind the rostrum, at the level of the anterior border of the eye-hoods. Dac- tylus of smaller chela in the male much enlarged, twice as long as broad. Merus of 3ld legs almost 3,5-times as long as wide in the middle clypeatus Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 897, PI. LXXXI, LXXXII, fig. 36). f„ Rostrum very small, rostral carina not interrupted, running, as in A. Alcyone, from the tip of the rostrum backward. Dactylus of smaller chela in the male not enlarged. Merus of 3rd legs 3-times as long as wide in the middle. . . tryphopus Nob. l) (G. NOBILI, Ricerche sui Crostacei della Polinesia, Torino, 1907, p. 355). e2 First carpal article at least one and a half as long as 2nd. Merus of 3rd legs about 4-times as long as wide in the middle. fx Rostrum well developed, reaching to the middle of visible part of basal antennular article ; the frontal margin appearing at either side of the rostrum as a semicircular lobe, bearino- o 7 or 8 long setae. Carpus of 3rd legs with three spinules on the middle of posterior margin superciliaris Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 896, PI. LXXXI, fig. 35). f2 Frontal margin presenting a convex prominence at either side of the middle, the two prominences separated by a median sinus, below which the very short rostrum is situated. Small chela of the male 3-times as long as high. Merus of 3rd legs 4-times as long as wide in the middle. Adamastor Cout. (H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 1908, p. 19). 1) The position of this species, which was regarded by the late Dr. Nobili as a variety of A. Alcyone, is doubtful, because it is unknown whether the ist carpal article of 2"d legs is really longer than the 2!ld or not, as also because only the female is known. SIROGA-EXPEDITIE XXXIX a '. 41 3i8 fz At either side of the minute rostrum the frontal margin runs transversely outward, the front appearing truncate. Dactylus of smaller chela in the male broadened, half as broad as long, a little shorter than the palm. Merus of 3rd legs almost 4-times as long as wide in the middle, carpus without spinules on the posterior margin pachychirus Stimps. (young specimens) d„ Fingers of smaller chela in the male not shorter than the palm. ex Dactylus of smaller chela in the male enlarged, half as broad as long. First carpal article of 2nd legs one and a half to almost twice as long as 2nd. At either side of the minute rostrum the frontal margin appears truncate pachychirus Stimps. (adult specimens) e„_ Fingers of smaller chela in the male just as long as the palm, gaping, their infero-external border excavate and fringed with short setae. Dactylus tapering, not broadened. First carpal article but a little longer than 2nd. Merus of 3rd legs 5- or almost 5-times as long as wide in the middle. _/": Merus of 4* legs armed with an apical tooth like that of 3rd Stanleyi Cout. (H. CüUTlÈRE, in: Buil. Soc. Philom. Paris, 1908, p. 17). ƒ, Merus of 4th legs quite unarmed at apex, 5,2 — 5,6-times as long as wide in the middle .... Stanleyi Cout. var. dearmatus de Man a3 Merus of 3rd legs unarmed at apex. ó-y Rostrum well developed, reaching to the middle of basal antennular article, continued backward as a short and strong carina . . . ovaliceps Cout. (H. CoUTIÈRE: Alpheidae Mald. and Laccad. Archip. 1905, p. 888, PI. LXXVII, fig. 27). <53 " Rostrum wanting at all, front truncate frontalis H. M.-Edw. Insignis subgroup. ax Merus of 3rd legs with an acute tooth at apex. 6X Larger chela with a transverse groove near the articulation of the dactylus. cx On either side of the rostral carina, at the base of the eye-hoods, a pointed tooth, flattened at its base; interorbital part of the rostral carina strongly compressed, acute, with a small, obtuse tubercle at the level of these lateral teeth. u2 Rostrum obtuse, rather considerably widened back- ward. Lobes terminating the upper and the lower margin of larger chela obtuse ("en ogive") Atcdouini Cout. '95 328 ms Rostrum narrow, obtuse, subulate. Lobes terminating the upper and the lovver margin of larger chela acute chiragricus H.M.Edw. 4 Smaller chela of the male less than 4-times as long as high, with both margins distinctly notched; lobes terminating both margins of larger chela obtuse, rounded crassimanus Heller ') k. Merus of 3rd legs more than 6-times as long as wide ; rarely 5, 4-times, but in this case the lower border of the larger chela hardly emarginate. /j Smaller chela of the male of a rather stout form, the proportion between length and height being 4 or less, with an acute tooth at either side of the articulation of the dactylus. m1 Merus of 3vd legs in adult specimens somewhat more than 6-times, in younger individuals almost 7-times as long as wide, with the extremity of the lower margin rather sharp pareuchirus Cout. m* Merus of 3rd legs 5, 4-times as long as wide, with the extremity of the lower margin rounded pareuchirus Cout. var. Leucothea de Man /„ Smaller chela of the male at least 5-times as long as high, carpocerite just as long as the antennular peduncle. Merus of yd legs 7, 5-times as long as wide. w, Frontal margin distinctly emarginate near the base of the rostrum •, 2nd antennular article a little longer than the visible part of the ist; larger chela distinctly emarginate on the lower margin. . . leptochirus Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 914, PI. LXXXVII, fig- 54)- iu„ Frontal margin straight near the base of the rostrum ; 2nd antennular article a little shorter than the visible part of the ist; larger chela with the lower margin only slightly sinuous leptochiroides de Man 1) It rernains uncertain whether the japanese A. lobidens de Haan is identical with A. crassimanus or not. I was unable to examine the single type specimen of A. lobidens, that is still preserved in the Leyden Museum, but that, as Dr. Hokst informs me, is broken and fragmentary. I was, however, enabled to study two specimens of the species referred by Dr. ORTMANN to A. lobidens (in: Zool. Jahrb. V. Syst. 1890, p. 474, Tab. 36, tig. 13); unfortunately these specimens which I received frorn the Museum at Stiassburg, were desiccated and in a bad state. Thcy bore a close resemblance to A. crassimanus, especially the legs of the ist pair, but those of the 2"d were somewhat different. The merus of the 2"d legs proved to be 8,5-times longer than wide and the carpal segments were 1,8 mm.; 1,8 mm.; 0,52 mm.; o,4S mm. and 0,7 mm. long, the lst segment 5,6-times longer than thick at distal extremity. These legs appeared therefore a little more slender than those of A. crassimanus and the 2"d segment was just as long as the i*<. The question whether both species are different or not, must be left to further researches. 196 c2 Dactyli of three posterior legs with a small, acute, accessory tooth on the posterior margin Polyxo de Man ói Both in the male and in the female the dactylus of the small chela subspatulate in form, "Balaeniceps"-shaped. c\ Larger chela about 2,2-times as long as high, fingers almost as high as the palm. i/l Merus of yd legs 3,7-times longer than wide strenuus Dana d% Merus of yd legs almost 5-times as long as wide. strenuus Dana var. angulatus Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 914). c„ Larger chela 2,4-times as long as high, fingers distinctly less high than the palm. Merus of yd legs 5-times as long as wide . . Audouini Cout. (H. CoUTlKRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 914). cz Larger chela 2,86 — 3-times as long as high. Merus of 3rd legs 5,26 — 6, 5-times as long as wide. . . ... pareuchirus Cout. var. iiuitatrix de Man b„ Dactylus of smaller chela neither in the male nor in the female sub- 6 J spatulate in form, never "Balaeniceps"-shaped. (Tj Rostrum triangular, flattened above, very narrow. Proportion between length and height of the small chela in the male 4,85 . bis-incisus de Haan var. stylirostris Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 911, Fig. 49, 49*2). c„ Rostrum not flattened above. dx Groove or depression on the supero-internal surface of the larger chela not triangular. ex Groove or depression on the supero-internal surface of the larger chela U-shaped, the margins perpendicular to the upper margin of the palm. Rostrum joining the frontal margin by a regular curve Bouvieri A. M.-Edw. var. Hululensis Cout. (H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 908, PI. LXXXV, fig. 46). tne second segment only 1,1-times longer than the first; the chela, in which the fingers are hardly shorter than the palm, appears as long as the 4th and the 5th segments combined. Dana's description is not in accordance with his figure 8^: in this figure the sum of the 3rd, 4th and 5th segments appears, like in the specimen from Samoa, one and a half as long as the 2nd segment, while according to the description it should be just as long. The chela in the Samoa specimen is not shorter than the 4th and the 5th segments taken together. Ischium of 3,d and 4th legs with a movable spine. Merus of 3rd legs 4-times as long as wide in the middle, apical tooth rather small; the posterior margin of the carpus ends in a spine, for the rest the carpus is unarmed ; propodus with 6 sets of spinules, dactylus simple, almost half as long, viz. three-sevenths of the propodus. General distribution: Balabac Straits (Dana); Samoa (Ortmann) ; Japan, Kagoshima (Ortmann). f 21. AlpJicus parvus de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI. 1909. p. 102. Stat. 133. July 25/27. Anchorage off Lirung, Salibabu-island. 36 m. Mud and hard sand. 1 female with eggs. A new species of small size, apparently belonging to the Crinitus subgroup and closely related to A. crinitus Dana and A. clypeatus Cout. Rostrum acute, one and a half as long as broad at its base, projecting horizontally forward and reaching to the distal fourth of the visible part of ist antennular article; the anterior part of the rostral carina, from the tip to the middle of the eyes, is strongly compressed, sharp, the posterior part that first somewhat broadens nearly to the base of the orbital hoods and, narrowing then again, is continued to the posterior third of the carapace, appears obtuse. The middle part of the interorbital carina is separated from the rounded, unarmed, orbital hoods by narrow, though rather deep grooves, that anteriorly become broader, while they slightly diverge posteriorly. Eyes large, broader than the interspace between them. Frontal margin transverse, only very slightly sinuate at either side of the rostrum. Abdominal pleura broad, rounded or obtuse. Telson 4,54-times as long (1,68 mm.) as its posterior margin is broad (0,37111111.), anteriorly twice as broad (0,8 mm.); posterior margin hardly prominent, inner spines at the outer angles 0,35 mm. long, almost as long as the posterior margin is broad, outer spines one-third of the inner. Spinules of the upper surface 0,15 — o, 16 mm. long, inserted not far from the lateral margins, the anterior pair immediately in front of the middle, the posterior pair one and a half as far distant from the posterior margin as from the anterior pair. Second joint of antennular peduncle twice as long as thick, one-fourth longer than the visible part of the ist, 3rd joint but a little shorter than the latter; terminal spine of stylo- cerite hardly reaching to the end of ist joint. Basicerite with a small, inferior spine, 0,16 mm. long, not extending as far forward as the stylocerite. Carpocerite projecting, like in A. clyfteatus, beyond the antennular peduncle almost by the whole length of 3rd article ; terminal spine of 226 359 the scaphocerite, the outer margin of which is slightly concave, as in A. elypeatus, reaching to or perhaps even just beyond the end of the carpocerite, extending backward to the middle of the 2nd antennular article and projecting, like in A. elypeatus, by two-fifths of its length beyond the tip of the rather narrow blade, which is fringed with long- hairs and just reaches to the end of the antennular peduncle. Penultimate joint of external maxillipeds slender, 2,5-times as long as the distal extremity is thick, terminal joint one and a half as long as the penultimate, 5-times as long as broad or thick at its base, in a lateral view. Larger cheliped missing. Merus of the smaller cheliped 3-times as long as broad, upper margin unarmed, infero-internal margin with a strong, slender spin e near the distal extremity, the length of this spine is one-third the greatest width of this joint. Chela 2,1 mm. long, half as long as the carapace (4,3 mm.), fingers very little shorter than the palm, proportion between the length of the fingers and that of the palm as 10 : 11 ; chela almost 4-times as long as the palm is high (0,55 mm.). Merus of 2nd legs 8-times as long as broad. Carpal segments 0,64 mm., 0,82 mm., 0,3 mm., 0,3 mm. and 0,43 mm. long, chela 0,83 mm. long (palm 0,38 mm., fingers 0,45 mm.); the 2nd segment, 5-times as long as thick, is 1,28-times as long as the ist, the ist one and a half as long as the 5th, the 3rd and the 4th equal, half as long as the ist and almost twice as long as thick, the chela, finally, is as long as the 2nd segment and a little longer than the 4th and the 5th together. Ischium of 3ld and 4th legs with a strong movable spine. Merus of 3rd legs 4, 5-times as long as broad in the middle, glabrous, armed with a strong, acute, apical tooth like in A. bucephalus, carpus half as long as the preceding joint, 3, 3-times as long- as thick in the middle, its posterior margin terminating in a strong, acute tooth, for the rest unarmed. Propodus 1,24 mm. long, one-fourth longer than the carpus, 5-times as long as broad, its posterior margin with 6 strong spines ; there is also a spiniform seta at the end of the anterior margin, on which one observes also some other setae, like on the anterior margin of the carpus; dactylus simple, two-fifths of the propodus and just half as long as the carpus. Merus of the 4th legs 4, 8-times as long (1,72 mm.) as broad in the middle (0,36111111.), armed with an equally strong, apical tooth as the merus of the 3rd legs; carpus half as long as the merus, 3,6-times as long as thick, for the rest similar to that of the 3rd legs; propodus 1, 3-times as long (1,12 mm.) as the carpus (o, 86 mm.), 5-times as long as broad, with 7 strong spines on the posterior margin and a shorter one at the distal end of the anterior, which, like the anterior border of the carpus, bears a few long setae of different length ; dactylus, like that of the preceding legs, two-fifths of the propodus, simple. Eggs few in number, ovoid, one and a half as long as broad, large, 0,76 — 0,78 mm. long. Length from tip of rostrum to end of telson 11,5 mm. Remarks. A. crinitus Dana cliffers by its much larger size, by the different shape of the telson and the different arrangement of the spinules 011 its upper surface and on its posterior margin. The rostrum is longer, not continued backward beyond the orbital lioods, the 2nd antennular article is also longer. There are, finally, also differences in regard to the legs. 227 360 f 22. Alp heus consobrinus de Man. J. G. DE Man, in: Notes from the Leyden Museum. Vol. XXX. 1908. p. 101. Stat. 78. June 10/11. Lumu-Lumu-shoal, Borneo-bank. Reef. 1 male. Stat. 96. June 27. South-east side of Pearl-bank, Sulu-archipelago. 15 m. Lithothamnion. 2 specimens of small size, one of which with eggs. Stat. 115. July 9/1 1. East side of Pajunga-island, Kwandang-bay. Reef. 1 female with eggs. Stat. 125. July 18/19. Anchorage off Sawan, Siau-island. Reef. 1 ova-bearing female. Stat. 213. September 26 — October 26. Saleyer-anchorage and Surroundings, including Pulu Pasi Tanette, near the North point of Saleyer-island. Reef. 1 young specimen. Stat. 299. January 27/29. io°52'.4S., I23°i'.iE. Buka- or Cyrus-bay, South-coast of Rotti- island. Dived to a depth of 36 m. Mud, coral and Lithothamnion. 1 specimen without eggs and without the legs of first pair, probably belonging to this species. Stat. 315. February 17/18. Anchorage East of Sailus Besar, Paternoster-islands. Depth up to 36 m. Coral and Lithothamnion. 2 ova-bearing females, one of which is adult, and 1 young specimen. Closely related to A. bucephalus Cout. and A. clypeatus Cout. The male from Stat. 78 is 14,5 mm. long. Rostrum acute, reaching almost to the middle of the visible part of ist antennular article; rostral carina sharp, becomes flattened behind the eyes passing into the surface of the carapace. Frontal margin as in A. bucephalus. Second joint of antennular peduncle one and a half as long as the visible part of the ist, 3ld joint a little shorter than ist; stylocerite pointed, broadened at its base and reaching to the distal third of ist joint. Carpocerite extending by half the length of the 3ld joint beyond the end of the antennular peduncle. The basicerite appears unarmed, but in this specimen like in most others it seems to be broken off, for in the three specimens from Stat. 315 it bears a very small infero-lateral spinule. Scaphocerite resembling that of A. bucephalus, but just reaching beyond the tip of the carpocerite, the blade fringed with hairs ancl as long as the antennular peduncle. In the adult female from Stat. 315 which is 15,5 mm. long, the narrow rostrum extends to just beyond the middle of ist article, the 2nd article is but one-third longer than the visible part of the ist and the carpocerite extends almost by the whole 3"1 article beyond the end of the antennular peduncle; the acute stylocerite reaches almost to the end of ist article. The ova-bearing female from Stat. 115, 14111111. long, agrees with the preceding one, but the 2nd antennular article is but little longer than the ist and the carpocerite extends by half the length of 3rd article beyond the tip of the antennular peduncle. In the younger ova-bearing female from Stat. 315, only 8,5 mm, long, finally, the rostrum reaches to the distal third of the visible part of ist antennular article, the 2nd article is hardly longer than the ist, which is as long as the 3rd; the stylocerite reaches to the end of basal article. It remained doubtful whether the specimen from Stat. 299 belongs also to this species, because the scaphocerite appears a little shorter than the carpocerite, exactly as in A. bucephalus and because the two legs of the ist pair are missing. Telson both in the male ancl in the female s 1 i g h 1 1 y narrower than that of A. bucephalus, its length being in proportion to the width of the posterior margin as 9 : 31/-, in A. bucephalus as 9 : 4. In the adult male from Stat. 78 the telson is 2,7 mm. long, 1,44 mm. 228 3Ó1 broad anteriorly, its posterior margin i mm. broad and in the adult female from Stat. 3 1 5 these numbers are 2,28 mm., 1,32111111. and 0,84 mm.; in the small egg-bearing female from the same station, long 8,5 mm., the telson is still narrower posteriorly, being 1,22 mm. long, 0,68 mm. broad anteriorly and 0,36 mm. at the posterior margin. Endopod of caudal fan armed on its outer and posterior margin with about 30 spinules, those on the outer margin being larecr. Posterior marefin of the telson with 20 feathered setae between the outer aneles. Penultimate joint of external maxillipeds one and a half as long as thick; terminal joint twice as long as the penultimate and about 3-times as long as broad. Chelae of both legs of ist pair turned outward, the dactylus being situated on the outer side and even a little obliquely directed downward. Merus of the large cheliped of the adult male one and a half as long as broad; the slightly arcuate, upper margin ends in a subacute tooth, while the inner margin bears an acute tooth near the far end, which tooth is want ing in A. bucephalus\ in both chelipeds the ischium ends in a large prominence, which in a lateral aspect appears acute. Chela resembling that of A. bucephalus, the fingers measuring also one-third of its length, but, measured in the plane of the fingers, the palm appears a little Ie. ss high than in Coutière's figure 29c?, the length of the palm being in proportion to its height as 5:3; dactylus obtuse, immobile finger pointed. Inner (upper) face of the immobile finger and the contiguous part of the palm hairy, in a less degree also the outer (lower) side of the immobile finger. The prominence at the lower margin of the ischium of the large cheliped is more acute in the female than in the male; the merus is nearly twice as long as broad and the subapical tooth on the inner margin resembles that of the male. Chela considerably smaller than in the male, little more than half as long; its form is also different, for it seems to narrow more considerably towards the fingers, when looked at in the plane of the latter, so that the lower margin of the chela appears more strongly arcuate. Palm and immobile finger are nearly glabrous, except on its cutting-edge. The merus of the smaller cheliped of the male from Stat. 78 is a little broader than that of A. clypeatus, its outer face one and a half as long (2,6 mm.) as broad (1,6 mm.). The somevvhat arcuate upper margin ends in a subacute angle, when the outer face is looked at; the inner margin is unarmed. Carpus short as in A. clypeatus^ nearly as long as the anterior margin of its upper surface is broad; a small tooth near the middle of this margin. The chela which is 4,5 mm. long and much resembles that of A. clypcatus, is but little more than half as long as the large chela; measured in the plane of the fingers, i. e. on the inner (upper) surface, the chela appears 3-times as long as broad (high). Fingers slightly long er than the palm; dactylus situated on the outer side and much broadened, being half as broad as long; the upper (outer) face, which is slightly convex both longitudinally and transversely, narrows from the middle of the finger to the pointed tip, that is slightly curved inward. Along the edge that makes the inner (upper) face of the dactylus with the upper (outer) one, the finger is thickly fringed with long hairs from the base to near the tip; the somewhat flattened, inner (upper) face of the palm and of the immobile finger, which is straight and a little broader, at the inner (upper) side, than the dactylus, is also covered with long hairs. Unfortunately only one adult female carries the small cheliped, namely that from Stat. 31 5. 229 362 Merus unarmed, little more than tvvice as long as broad, with the upper margin strongly arcuate. Carpus longer than in the male, almost twice as long as broad near the articulation with the chela. Chela resembling that of the female of A. bucephalus\ viewed at from the upper side, the chela appears 3,5-times as long as broad near the carpal articulation; it regularly narrows towards the extremity of the fingers that are narrow, conical and little shorter than the palm, the palm being in proportion to the fingers as 13: 10. Carpus of second legs similar to that of A. bucephalus. In the adult male from Stat. 78 the carpal segments of the right leg are 0,7111111., 1,9111111., 0,44111111., 0,48 mm. and 0,8 mm. long, the 2nd segment, 0,25 mm. thick, is about 8-times as long as thick; chela 1,16 mm. long (palm 0,56 mm., fingers 0,6 mm.). In the left leg the carpal segments are 0,64 mm., 1,7 mm., 0,42 mm., 0,46111111. and 0,72 mm. long; the chela is 1,12 mm. long (palm 0,56111111., fingers 0,56 mm.). The carpal segments of the right leg of the adult female from Stat. 315 are 0,6 mm., 1,44 mm., 0,36 mm., 0,32 mm. and 0,56 mm. long; the chela is 1,05 mm. long (palm 0,5 mm., fingers 0,55 mm.); in the left leg these numbers are: 0,57111111., 1,3111111., 0,34111111., 0,32 mm. and 0,54111111.; the chela is 1,04 mm. long (palm 0,48111111., fingers 0,56 mm.). In the adult male the second segment appears almost 3-times, in the adult female somewhat more than twice as long as the first and the fifth segment appears in the male slightly longer than the first, in the female both are equal. Ischium of 3ld and 4"1 legs armed with a strong movable spine. Merus of 3rd legs 4- times as long as broad in the middle, armed with a strong, acute, subapical tooth ; upper margin straight, with very short setae along its whole length and with 2 or 3 longer ones at the distal end, lower margin with 3 or 4 short setae. Carpus half as long as the merus, lower margin straight, terminating in a strong tooth at the distal end, without spinules and glabrous; upper margin with long setae that are arranged in tufts of two or three. Propodus one-fifth longer than the carpus, with 6 pairs of movable spines along its posterior border, close to each of which two setae are inserted ; upper margin with long setae and with a slencler, though feeble spine at the distal end. Dactylus slender, slightly curvecl, measuring one-third of the propodus and without accessory claw. Merus of 4th legs with a subapical tooth w h i c h is co m pa r a t i v e 1 y as large as that of the 3rd. Whereas the male of A. consobrinus differs at first sight from that of A. bucepha/as by the small cheliped, the female can be distinguished by the scaphocerite being longer than the carpocerite, by the spine on the basicerite, by the merus of the larger cheliped presentino- a tooth 011 its inner margin and by the shape of the telson. 23. Alphcus spongiarum Cout. Alpheus spongiarum H. Coutière, in: Buil. Muséum Paris. 1897. N° 6. p. 236 and 1900. N° 8. p. 413. Alpheus spongiarum H. Coutière, Les "Alpheidae", Morphologïe externe et interne, formes larvaires, Bionomie. Paris 1899. p. 147. fig. 141. Alpheus spongiarum J. Pearson. Ceylon Pearl Oyster Report. Macrura. 1905. p. 85. Stat. 115. July 911. East-side of Pajunga-island. Kwandang-bay. Reef. 1 male. Stat. 133. July 25/27. Anchorage off Lirung, Salibabu-island. 36111. Mud and hard sand. 1 male. 230 Stat. 273. December 23/26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 13 m. Sand and shells. 1 female with eggs. Stat. 305. February 8. Mid-channel in Solor-strait oft" Kampong Menanga. 113 m. Bottom stony. 1 male. The specimen from Kwandang-bay is 12111111. long. Scaphocerite as long as antennular peduncle, blade reaching to the distal third of 2nd article; carpocerite longer than scaphocerite. The carpal segments of the 2nd legs measure : 0,56111111., 1,4111111., 0,3 mm., 0,32 mm. and 0,56 mm.; chela 1,18 mm. long (palm 0,5111111., fingers 0,68 mm.); proportion between first and second segment 2,5. Merus of 3ld legs 2,6 mm. long and 0,58 mm. broad in the middle, proportion 4,5; the outer posterior margin carries tvvo long setae in the middle and one near the tooth, the others are perhaps worn off; about 20 very short setae along the inner margin. Carpus ending in a subacute tooth at the distal extremity of its posterior border, the latter bears no spinule, but 5 or 6 long setae; anterior border with many setae of unequal length, two of which on the distal half are nearly as long as the carpus. Posterior border of propodus with 8 spines, but there is also a small spine at the far end of the anterior border, which, according to Coutière, does not exist in this species; posterior border also with many long setae, like the anterior. Dactylus with a tracé of an accessory claw. The young specimen from Stat. 133 is 9111111. long. Scaphocerite reaching to the middle of 3rd antennular article, blade hardly reaching beyond ist article. Proportion between the length (2 mm.) of the merus of 3rd legs and its width (0,43 mm.) in the middle 4,65 ; external posterior margin with 10 long setae that are about one and a half as long as the merus is broad, internal margin with about 20 much shorter setae, only o, 18 mm. long and less. External posterior border of the carpus with a small acute tooth at the far end, without a spinule in the middle, but fringed along its whole length with 10 long setae; anterior border on the distal third with 2 long setae that are as long as the carpus and with smaller setae behind them. Propodus but one-fourth longer than the carpus, posterior margin with 7 spines, no spine at the end of the anterior; near each of the 7 spines a seta is inserted, but for the rest the posterior border bears no setae, whereas the anterior is fringed with long ones. Accessory claw of dactylus not recognizable. The eggs of the female from Stat. 273 which is 13 mm. long, are few in number, globular, with a diameter of 0,8 mm. The carpocerite extends beyond the antennular peduncle only by one-fourth of 3rd article, scaphocerite hardly reaching to the end of the antennular peduncle, blade reaching to the distal fourth of 2nd article. The carpal segments of the 2nd legs are 0,5 mm., 1,06 mm., 0,28 mm., 0,3 mm. and 0,5 mm. long; chela 1,1 mm. long (palm 0,4111111., fingers 0,7 mm.); second segment only twice as long as first. Merus of 3ld legs 2,2 mm. long, 0,54111111. broad in the middle, only four times as long as broad; external posterior margin with 12 long setae, internal with about 25, that are short, measuring 0,16 mm. and less. Outer posterior margin of the carpus with 10 long setae, without a spinule but ending in an acute tooth, inner with 8 or 9 much shorter setae; anterior margin with 9 or 10 setae, of which one near the distal extremity is the longest, being almost as long as the carpus. Propodus one-third longer than the carpus, with 110 spine at the far end of the anterior border; posterior 231 364 border with 8 spines and with a long seta inserted near each of them ; anterior border with long setae. Accessory claw small, but distinct. The male, finally, from Stat. 305 is 11,5 mm. long. Scaphocerite hardly shorter than the antennular peduncle, blade reaching to the middle of 2nd article. Carpocerite extending beyond the tip of the antennular peduncle by the length of 3rd article. Merus of 3rd legs 2,24 mm. long, 0,52 mm. broad in the middle, only 4,3-times as long as broad ; external posterior margin fringed with 10 long setae, setae of the internal margin short. Posterior border of the carpus terminating in an acute tooth, without a spinule on the middle, but fringed with 1 1 long setae. Propodus with 7 spines on the posterior border, without a spine at the far end of the anterior, that is fringed with long setae, while near each of the 7 spines of the posterior a seta is inserted. There is a slight tracé of an accessory claw on the dactylus. These specimens, though few in number, are very interesting, for they render it pro- bable that A. spongiarum and A. paraculeipcs are varieties of one and the same species. According to Coutière (Alpheidae Mald. and Laccad. Archip. 1905, p. 894) the merus of 3rd legs should be 5-times as long as broad in A. spongiartim, but 3,88-times in A. paraculeipcs : in the four specimens, which were referred to A. spongiarum because the external posterior margin of the merus is fringed with long setae, the proportion between length and width proved to be 4,5; 4,65; 4 and 4,3. This proportion appears therefore to vary considerably, in no one the merus appears so slender as should be characteristic of this species and in the ova-bearino- female it has the same stout form as in A. paraculeipes. Also in regard to other characters one observes some variability, so e. g. in the specimen from Stat. 1 1 5 the propodus of the 3rd legs carries a spine at the far end of the anterior border, and an accessory claw on the dactylus is usually more or less distinct. General distribution: Djibouti (Coutière); Cheval Paar, Ceylon (Pearson) ; Torres Strait (Coutière). f 24. Alpheus Eulimcne de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI. 1909. p. 101. Stat. 154. August 14. o° 7'.2 N., i30°25'.5E. Oft" North coast of Waigeu Island. 83 m. Grey muddy sand, shells and Lithothamnion. 1 specimen. A new species of the Crinitus subgroup, closely related to A. styliceps Cout. and to A. Arethusa de Man. Rostrum very small, subacute, reaching only to the 2nd fifth of the visible part of ist antennular article, twice as broad at its base as it is long; at either side of the rostrum the frontal margin runs transversely outward and, nearly as in A. supcrciliaris Cout., is sepa- rated by a distinct emargination from the rouncled, orbital hoods. Rostral carina rather sharp and narrow between the orbits, from which it is separated by narrow and shallow grooves ; posterior to the corneae the rostral carina becomes somewhat broader and is prolono-ed to just behind the middle of the carapace. The posterior margin of the pleura of the isl abdominal somite terminates in a spiniform, 365 though obtuse process, that is curved forward; pleura of the following somites rounded. Posterior margin of óth somite with a large, acute tooth at the outer angles, but, differently from A. Arcthusa, unarmed in the tniddle. Telson long 1,25 mm., 3,5-times as long as the posterior margin is broad, greatest width almost twice as broad as the posterior margin, the proportion being as 17:9. Posterior margin not at all prominent, internal spines near the outer angles one-third the width of the margin, external spines half as long as the internal ; spinules of the upper surface 0,15111111. long, anterior pair twice as far distant from the posterior margin as from the anterior, posterior pair almost one and a half as far distant from the posterior margin as from the anterior pair. Second joint of antennular peduncle almost twice as long as thick, almost one and a halt as long as the visible part of the ist article, which visible part appears a little longer than the 3rd; stylocerite acute, reaching to the distal third or fourth of the visible part of ist article. Basicerite umarmed. Carpocerite slender, projecting bevond the tip of the antennular peduncle almost by the length of the terminal article-, the scaphocerite, the outer margin of which is slightly concave, reaches to midway the tips of both peduncles, the blade, however, is still shorter than in A. styliceps, for it only extends to the 2nd third part of 2nd antennular article. Penultimate joint of external maxillipeds one and a half as long as broad, in a lateral view, terminal joint twice as long as the penultimate and four times as long as broad. Merus of the large cheliped stout, twice as long as broad in the middle, upper margin unarmed, infero-internal margin with a rather strong, acute tooth at the far end. Large chela resembling that of A. Aretliusa, a little more than one and a half as long (5,25 mm.) as the carapace (3,2 mm.), rostrum included, ovoid, almost 2,5-times as long as high (2,2 mm.) and almost as thick (1,9 mm.) as high; length of the fingers, i. e. the length of the dactylus (1,55 mm.), not yet one-third the total length. Palm smooth, glabrous, outer face of the immobile finger slightly concave, inner face convex, fingers as in A. Ar et Int sa. Merus of the small cheliped 2,6-times as long as wide, presenting its greatest width at the anterior third, infero-internal margin with a rudimentary tooth at the far end. The chela, closely resembling that of A. styliceps, is 2,3 mm. long, hardly three-fourths the length of the carapace-, the length of the palm, which is one and a half as long as high and slightly thicker than high, is in proportion to the length of the fingers as 10 : 13. Palm smooth and glabrous, fingers shutting close together, distinctly curved inward. Merus of second legs 7-times as long as broad. Carpal segments 0,5 mm., 0,72 mm., 0,2 mm., 0,2 mm. and 0,36 mm. long, chela 0,74 mm. long (palm 0,3 mm., fingers 0,44111111.); 2nd segment 4-times as long as broad, 3rd and 4th segments almost quadrate, their length being in proportion to the width as 10 : 9. The 2nd segment appears, like in A. Arctliusa, one and a half as long- as the ist. Third legs resembling those of A. Arethusa, but there are 110 spinules on the posterior margin of the carpus and the dactylus is sim pi e, without an accessory claw. Merus 4,1 -times as long as broad in the middle, armed with a strong apical tooth, carpus almost half as long as the merus, 2,8-times as long as thick, propodus 4, 4-times as long as broad, narrowing distally, 233 SIBOGA-EXPEDITIE XXXIX a '. 47 366 its posterior margin with 7 spines, the propodus 1,4-times as long as the carpus, dactylus one- fourth of the propodus. Merus of fourth legs unarmed, as in A. Arethusa, 4,4-times as long as broad in the middle, carpus 2,8-times as long as thick, unarmed, almost half as long as the merus, propodus just one and a half as long as the carpus, with 6 spines on the posterior margin, dactylus one-fourth the length of the propodus, simple. The only collected specimen, probably a young female, is 8 mm. long. f25. Alpheus pachychirus Stimps. Alp heus pachychirus W. Stimpson, Proc. Acad. Nat. Scienc. Philadelphia, 1860, p. 30. Alpheus pachychirus J. G. de Man, in: Notes from the Leyden Museum, XII, 1890, p. 116, PI. 6, fig. 14 and in: Abhandl. Senckenb. Naturf. Gesell. XXV, 1902, p. 875. Alpheus pachychirus A. Ortmann, in: Zoolog. Jahrb. V. Abth. f. Syst. 1890, p. 489, Taf. XXXVI, fig. \ja, k. Stat. 99. June 28/29/30. 6°7'.5 N., I20°26'E. Anchorage off North-Ubian. 16 — 23 m. Litho- thamnion. 1 egg-bearing female without large cheliped. Stat. 133. July 25/27. Anchorage off Lirung, Salibabu-island. Reef. 1 egg-bearing female. Stat. 315. February 17/1S. Anchorage East of Sailus Besar, Paternoster-islands. Depth up to 36 m. Coral and Lithothamnion. 1 male. Some remarks about the collected specimens will be, 110 doubt, useful, because this species is closely related to A. clypeatus Cout. The male from the Paternoster-islands is still young, 12,5111111. long, for this species attains the length of 25 mm. There is an obtuse, median carina between the eyes, beyond which it does not reach; this carina is obliquely directed downward and, curving quite anteriorly suddenly downward, ends in a minute, triangular rostrum, which is 0,066 mm. long and hardly broader at its base; the length of the rostrum is only one-sixth the length of i5t antennular article, as far as it is visible from above. The slightly concave, anterior margin of the front curves laterally to the lateral margins. The 2nd joint of the antennular peduncle is one and a half as long as the visible part of the ist and twice as long as broad, while the 3rd joint is as long as the ist. The stylocerite, that reaches to the end of ist article, terminates, about as in the figure 50 of PI. LXXXVI of Coutière's paper on the Alpheidae of the Maldive and Laccadive Archipelagoes, 1905, in a slender spine which is half as long as the basal part. The antennal peduncle extends beyond that of the upper antennae by half the length of the 3vd article; the terminal spine of the scaphocerite extends almost to the end of the antennular peduncle and reaches with one- fourth of its length beyond the blade that extends almost to the middle of 3rd article. There is a v e r y s m a 1 1 spine on the anterior margin of the lower face of the basicerite ; this spine is 0,14 mm. long, only twice as long as the minute rostrum. According to Coutière the endopod of the caudal fan should be quite unarmed; in this specimen, however, one observes on its free margin 6 spines that increase in length from the first to the sixth, the sixth being 0,2 mm. long, twice as long as the first. Terminal joint of external maxillipeds 1,06 mm. long and 0,4 broad, 2,5-times as long as broad; the extremity 234 367 is obtuse, truncate and the margins are beset with long' hairs; penultimate joint half as long as the terminal. Inner margin of merus of the large cheliped terminating at the distal extremity in an acute tooth or lobe, the two other margins unarmed. The fingers of the large chela which is 6,8 mm. long-, are hardly half as long as the palm. Of the small cheliped which is placed on the left side, the chela is half as long as that of the other, fingers a trifle shorter than the palm. The height (breadth) of the outer face of the palm is in proportion to its length as 7 : 8, but according to Coutière's figure (1. c. PI. LXXXII, fig. 36^) this proportion should be in A. clxpeatus as 7: 10, the palm being here longer in proportion to its height; dactylus twice as long as broad. The carpal segments of the second legs are respectively 0,96 mm., 0,56 mm., 0,28 mm., 0,32 mm. and 0,56 mm. long; the chela is 0,74 mm. long, fingers about as long as the palm; in A. clypeatits the 2nd segment appears hardly shorter than the ist, while in this specimen the ist is more than one and a half as long as the 2nd. Merus of third legs almost 4-times as long as broad, appearing a little more slender than in A. clypeatus, and this is also the case with the following joints. The female from Stat. 133 is 16 mm. long. The minute rostrum is smaller than in the male just described, it is only 0,04 mm. long, one-tenth the visible part of ist antennular article; 2nd article almost twice as long as the visible part of the ist. The distal spine of the scaphocerite extends with one-third of its length beyond the blade. The spinule on the basal joint of the outer antennae is 0,12 mm. long, 3-times as long as the rostrum. Of the large chela, situated on the left side, the fingers are decidedly shorter than half the length of the palm. While this chela is 5,5 mm. long, the smaller is not yet half as long, viz. 2,25 mm.; fingers much shorter than the palm. The other legs are as in the male. Just as in the male the inner uropod bears 6 or 7 spinules on the outer part of its free margin. The carpal segments of the ova-bearing female, long 15,5 mm., from Stat. 99 are 0,9 mm., 0,46 mm., 0,26 mm., 0,28 mm. and 0,52 mm. long; chela 0,82 mm. long. In this specimen the ist segment is almost twice as long as the 2nd. Inner uropod as in the preceding specimens. General distribution: Loo Choo Islands (Stimpson) ; Tahiti (Ortmann, de Man) ; Kagoshima, Japan (Ortmaxn); Ternate (de Man); Maldive and Laccadive Archipelagoes (Coutière). f 26. Alphcus Stanleyi Cout. var. dearmatus de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 287. Confer: H. Coutière, in: Buil. Soc. Philom. Paris. (9) Tomé XI, 1908, p. 17. Stat. 152. August 12 13. Wunoh-bay, N.W. coast of Waigeu-island. Reef. 2 males. Stat. 240. November 22 till December 1. Banda-anchorage. Black sand, coral and Lithothamnion- bank in 18 — 36 m. 1 male. It is not clear in Coutière's description of A. Stanleyi whether the merus of the fourth legs is also armed with a strong spine, like that of the third; at my request Professor Coutière, however, kindly wrote me "que la 4me paire a Ie méropodite épineux comme la 3me." It is therefore that the specimens collected by the "Siboga" are regarded as a variety, because 23S 368 the merus of the fourth legs appears unarmed: it is, indeed, only by means of the microscope that one observes a tracé of an extremely small, rudimentary tooth. The merus of third legs, however, bears a strong acute tooth at the apex. My attention was also drawn by him to a typographical error in the relative measurements of the small chela, the height being 0,72, not 1,72. The largest specimen is one from Stat. 152, the specimen from Banda has nearly the same size, while the other specimen from Wunoh-bay is the smallest of all ; all the specimens are of a smaller size than the single individual, long 18 mm., on which this species was established. Except the rostrum the frontal region much resembles that of A. frontalis H. M.-Edw., while the resemblance to A. superciliaris Cout. is still greater. The acute triangular rostrum that almost reaches to the end of basal antennular article, arises from a protruding part of the front like in these species and at either side of the rostrum the frontal margin runs S-like towards the rounded orbital hoods, that are greatly prominent laterally. Rostral carina compressed, sharp, disappearing at the base of the orbital hoods, from which it is separated by rather deep grooves. Antennular peduncle and stylocerite as in A. stiperciliaris. Carpocerite extending beyond the tip of the antennular peduncle by half the 3rd article; the terminal spine of the scaphocerite extends, in the largest specimen from Stat. 152, almost to the end of the antennular peduncle, while the narrow blade reaches to the 2nd third part of 3rd antennular article, in the younger specimen to the end of median article. As is proved by the measurements, the telson appears in the youngest specimen 4-times, in the two other ones 3,6-times as long as the posterior margin is broad and in the still larger type specimen of the typical species 3,27-times: the telson probably therefore not differs from that of the typical species. Posterior margin as in A. superciliaris, outer angles acute, not prominent, spinules of the upper surface situated near the lateral margins. Except in the largest specimen, both chelipeds are present; in the male from Banda the larger cheliped is situated at the left, in the other specimen at the right side. Merus of the large cheliped of the Banda male stout, twice as long as the outer surface is broad, the infero-internal margin terminates in a small, acute tooth, while the upper margin ends in a compressed tooth, that appears acute in a lateral view, but rather obtuse, when looked at from above. Relative dimensions of the chela: fingers i; total length t,,t, or 3,4; height 1,27. The chela therefore seems to agree with that of the typical species, dactylus as in A. ovaliceps, but the tip distinctly truncate. In the male from Banda the large chela is 2,5-times as long as the other. Merus of small cheliped not shorter than that of the large, but it is 2,5-times as long as broad; infero- internal margin unarmed, upper margin as in the merus of the other cheliped. The smaller chela seems also to agree with that of the typical species, its relative dimensions are : fingers 1 , total length 2, height 0,64 and the fingers show exactly the features of A. Stanleyi. Merus of second legs in the male from Banda 6,6-times, in the younger specimen from Stat. 152 5,7-times longer than wide, appearing in the latter less slender. In the Banda male the carpus is 1,36-times, in the younger specimen from Stat. 152 1,28-times as long as the merus ; in the Banda male the carpal segments are 0,9 mm., 0,8 mm., 0,28 mm., 0,28 mm. and 0,46 mm. 236 369 long, in the other specimen: 0,66 mm., 0,54 mm., 0,19 mm., 0,21 mm. and 0,3211111:.; in this specimen the second segment appears 2,7-times, in the Banda specimen 3,5-times as long as thick, the third and the fourth segment are almost as thick as long and the fifth is 1,7-times as long as thick at its far end. The chela, 1,15 mm. long in the Banda male and 0,88 mm. in the other, appears one-third longer than the first segment of the carpus; the fingers are a little more than one and a half as long as the palm, which is almost one and a half as long as wide. As results from the Table of measurements, the relative dimensions of the 3rd legs agree pretty well with those of the typical species, viz. : merus 2,25; carpus i; propodus 1,4. The merus is armed with a strong acute tooth, directed obliquely forward, the propodus bears 7 or 8 spinules, that slightly increase in length and the three or four last of which are doublé. Dactylus very short, hardly one-fourth of the propodus. The 4th legs that are characteristic of this variety have been described above. The specimens from Stat. 152 are 14 mm. and 9,5 mm. long, the male from Banda 13 mm. Table A. Proportion between length of telson and width of posterior margin Proportion between the width at base and that of posterior margin Proportion between the length of the telson and the distance of the anterior pair of spinules from the posterior margin Proportion between the distances of both pairs of spinules from the posterior margin N° 1. N» 2. 3,6 3.57 I,S5 i,9 2 2,1 1,8 N° 3- 4 2 ï.9 Table B. Relative dimensions of merus carpus propodus Proportion between length and width of merus Proportion between length and width of propodus Relative dimensions of merus carpus propodus Proportion between length and width of merus Proportion between length and width of proprodus N» 1. NO 2. N» 3. 2,1 2,1 2,3 I I 1 of third legs 1,4 i.4 i.5 5 4,46 4,6 5 5,4 4,3 2,45 2,36 2,33 1 1 1 of fourth legs i.5 i.5 i,5 5>6 5>4 5,2 6 6 6 f27. Alphcus frontalis H. M.-Edw. Alpheus frontalis H. Milne-Edwards, Hist. Nat. Crust. II, 1837, p. 356. Alphcus frontalis G. Cuvier, Règne animal. Crustacés. PI. 53, fig. 2. Alpheus frontalis A. Ortmann, in: Zoolog. Jahrb. V. Abth. f. Syst. 1890, p. 488 and in: Jenaische Denkschriften, VIII, 1S94, p. 15. Alpheus frontalis H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 899. Alphcus latifrons A. Milne-Edwards, Journal des Museums Godeffroy. 1874, p. 11. Alphcus latifrons J. G. de Man, in: Archiv f. Naturg. 53. Jahrg. 1S88, p. 521, PI. XXII, fig. 4 and in: Zoolog. Jahrb. IX. Abth. f. Syst. 1897, p. 758, Taf. 36, fig. 67 and in: Abhandl. Senckenb. Naturf. Gesells. XXV, 1902, p. S/6. 237 37° Stat. 37. March 30/31. Sailus ketjil, Paternoster-islands. Depth 27 m. and less. Coral and coralsand. 1 egg-bearing female of small size and 2 still younger specimens. Stat. 53. April 21/22. Bay of Nangamessi, Sumba. Depth up to 36 m. Coralsand, near the shore mud. 1 young male and 1 egg-bearing female of the same size. Stat. 60. April 27/28. Haingsisi, Samau Island, Timor. Reef. 1 adult male. Stat. 61. May 1/2. Lamakera, Solor-island. Reef. 1 egg-bearing female of small size. Stat. 93. June 24/25. Pulu Sanguisiapo, Tawi-Tawi-islands, Sulu-archipelago. Reef. 1 adult male and 1 adult female without eggs. Stat. 115. July 9/1 1. East side of Pajunga Island, Kwandang-bay. Reef. 2 adult males. Stat. 131. July 24/25. Anchorage off Beo, Karakelang-islands. Reef. 1 young specimen. Stat. 133. July 25/27. Anchorage off Lirung, Salibabu-island. 3 young males and 3 young females, collected on the reef, except one that was captured at a depth of 36 m., where the bottom was mud and hard sand. Stat. 209. September 23. Anchorage off the south point of Kabaëna-island. Reef. 1 male and 1 egg-bearing female, both of medium size. Stat. 213. October. Pulu Pasi Tanette. Reef. 19 specimens, adult males, egg-bearing females and younger specimens; some of these specimens are contained in yellow brown felted tubes formed by Oscillariae. Stat. 220. November 1/3. Anchorage off Pasir Pandjang, West coast of Binongka. Reef. 1 male of medium size and [ younger specimen contained in a tube. Stat. 240. November 22 till December 1. Banda-anchorage. Black sand, coral and Lithothamnion- bank in 18 — 36 m. 5 young specimens. Stat. 250. December 6/7. Kur— island. 27 m. Coral and Lithothamnion. 1 young specimen. Stat. 261. December 16/18. Elat, West coast of Great Kei-island. Reef. 1 adult, egg-bearing female. Stat. 282. January 15/17. 8°25'.2S., i27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 4 young specimens. Stat. 285. January 18. 8° 39'.! S., I27°4'.4E. Anchorage South coast of Timor. 34 m. On the limit between mud and coral. Lithothamnion. 1 very young specimen. Stat. 301. January 30 — February 1. io°3S'S., I23°25'.2E. Pepela-bay, East coast of Rotti- island. Reef. 2 young males. Stat. 313. February 14/16. Anchorage East of Dangar Besar, Saleh-bay. Reef. 1 young specimen, in an Oscillaria-tube. The fact, already contended by Dr. Ortmann in 1894 tnat A. latifrons A. M.-Edw. should be identical with A. frontalis H. M.-Edw., was verified by Coutière in 1900 (Buil. Muséum Paris, N° 8, p. 414) and also in 1905 in his important work on the Alpheidae of the Maldive and Laccadive Archipelagoes. The remarkable manner of life of this species in felted tubes formed by Oscillariae, first observed by Richters in 1880, when he described his Betacus utricola, which is identical with this species, afterwards, 1. c. 1888, by myself on specimens from Amboina, is also shown by the specimens that were collected by the "Siboga" at Pulu Pasi Tanette near the island of Saleyer and at Stat. 220 and 313. The tubes are 20 — 30 centim. long. It is quite remarkable that they were not observed by Coutière. The form of the front, of the anterior margin of the carapace, is rather variable in this species. In the adult male from Haingsisi, which is 38 mm. long, the front extends as far forward as the basal joint of the outer antennae; it is arcuate, slightly emarginate in the middle and laterally near the outer angles. In an adult, egg-bearing female from Stat. 2 1 3 the front is a little more prominent, not emarginate in the middle and the lateral emarginations are less conspicuous than usually; the lateral walls run, from the front to the orbits, more obliquely than in the male from Haingsisi. In the adult, egg-bearing female from the Kei Islands, which is 238 37i jS mm. long, finally, the front presents again another form : the lateral emarginations are larger, so that the median part of the front appears less broad than usually and it is also emarginate in the middle. In the specimen from Stat. 2S5, only 9 mm. long, the median carina between the eyes is rather prominent. I will still add that in the three posterior legs the ischium is armed with a movable spine, inserted on a concavity of the lower border. The largest ova-bearing specimens from Stat. 213, that are contained in the tubes of Oscillariae, are 50111111. long; the females bear, however, already eggs at a much younger age: so e. g. the egg-bearing female from Stat. 37 which is 21 mm. long and that from Stat. 131, the length of which is only 15 mm.! The eggs are globular; those of the large females from Stat. 213 are 0,75 mm. broad, whereas the eggs, few in number, of the small specimen from Stat. 131 show a diameter of 0,62 mm. General distribution: New Holland (H. Milne-Edwards) ; Samoa Islands ( A. Milne- Edwards, Ortmann); Tahiti (Heller); Liu-kiu-islands (Ortmann); Celebes (de Man); Amboina (de Max, Ortmann); Ternate (de Man); Java Sea (de Man); Atjeh (de Man); Mauritius (Richters). III c. Insignis subgroup. f28. Alpheus bidens (Oliv.). Alpkeus bidens (Olivier) H. Milne-Edwards, in: Hist. Nat. Crustacés. II, 1837, P- 353' PI- 24> fig. 11 and 12. Alpheus tridentatus L. Zehntner, Crustacés de 1 'Archipel Malais. Genève 1894, p. 204, PI. VIII, fig. 24. Confer: H. Coutière, Les Alphéidae. Paris, 1S99, figs. 57 and 274. Stat. 131. July 24/25. Anchorage off Beo, Karakelang-islands. Reef. 7 specimens, among which 1 male and 2 egg-bearing females. Stat. 133. July 25/27. Anchorage off Lirung, Salibabu-island. Reef. 1 male. Stat. 154. August 14. o°7'.2 N., I30°25'.5E. Bougainville Strait. S^ m. Grey muddy sand, shells and Lithothamnion. 1 female without eggs. Stat. 240. November 22 till December 1. Banda-anchorage. From 9 — 45 m. Black sand, coral. Lithothamnion-bank in 18 — 36 m. 2 specimens, one of which is egg-bearing. Stat. 282. January 15/17. 8°25'.2S., i27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 female without eggs. H. Milne-Edwards and Coutière are, as far as I know, the only authors that have observed this rare species, though it must be remarked that Zehntner's A. tridentatus is identical with A. bidens, as was already suggested by Coutière (Buil. Muséum Paris 1897, N° 7, p. 303) and as I was able to verify by the examination of both specimens of Zehntner, kindly sent me by the Direction of the Museum at Geneva. Dr. Zehntner's description proved to be not quite exact in a few particulars. In both specimens the carpocerite reaches only to the 2nd third part of 3rd antennular article. In the female the ist article of the right antennular pecluncle bears two spines, as in the specimens collected by the "Siboga"; that of the left peduncle bears only one and this is also the case with the two peduncles of the younger individual. The two fïrst carpal segments of the second legs, finally, are not of equal length, but, -39 372 as in the specimens collected by the "Siboga", the 2nd is slightly longer than the ist: the carpal segments of the right leg of the female, indeed, measure i,6mm., 1,72 mm., 0,6 mm., 0,7 mm. and 0,9 mm., while the chela is 1,36 mm. long (palm 0,54 mm., fingers 0,82 mm.). According to H. Milne-Edwards A. bidens should attain a length of 3 inches, while for A. tridentatus the length of 23 mm. is indicated. The specimens collected by the "Siboga" are all of a much smaller size, the largest male and the largest egg-bearing female being 23 mm. resp. 23,5 mm. long. The rostrum reaches to the 2nd thircl part of the 2nd antennular article, the tooth on the post-rostral carina is small and subacute. Just in front of this tooth one observes at either side an acuminate and pointed tooth, the basal part of which is broad and flattened; these teeth appear more acute and more pointed than in Coutière's figure 57. Orbits prominent, terminating in an obtuse point or tooth, though no spine; between these teeth and the rostrum the frontal margin presents at either side a dentiform, obtuse prominence. Basal joint of caudal swimmerets ending in two strong spines, the outer of which is a little longer than the other. Second antennular article almost one and a half as long as the visible part of the ist and almost twice as long as thick. So e. g. in the male from Stat. 133, which is 23,5 mm. long, the 2nd article is 1,1 mm. long and 0,58 mm. thick, while the visible part of ist article is 0,85 mm. long. According to Zehntner the anterior margin of ist antennular article should bear a small spine: in all the specimens captured by the "Siboga" one observes here two small spines placed near one another, which measure one-fourth the length of the 2nd article and the outer of which is slightly longer than the other; these spines reach almost or just as far forward as the pointed spine in which ends the stylocerite, but sometimes the stylocerite and these spines are slightly shorter. Third article nearly as long as the visible part of the i5t. Antennal peduncle usually reaching to the middle of 3"1 antennular article, sometimes, as in the egg-bearing female from Stat. 240 and as in the specimen from Stat. 154, only to the end of the 2nd article. As far as I am aware, the male of A. bidens was still un- known, for Coutière does not mention A. bidens among the species of the Crinitus group, in which the small chela shows the 13 alaeniceps-iovm. (Coutière, 1. c. p. 228). In this species, however, it is really the case. In the male from Stat. 133 the small cheliped is situated at the right side. The upper margin of the merus ends in a strong, spiniform tooth, the two other margins are unarmed. The anterior margin of the carpus bears above two rounded lobes, that are separated by notches from one another and from the contiguous parts of the anterior margin. The chela is turned outward, so that the upper margin is situated externally and the fingers are horizontal; the upper margin of the palm, which is hardly longer than the fingers, is marked with a very short, transverse groove, just behind the articulation of the dactylus and, at either side of the latter, one observes an acute tooth, the tooth at the inner (upper) side being larger than the other. The dactylus shows quite conspicuously the characteristic Balaenicefis-ioxm, the arched upper surface of this finger appears, between the hairy lateral carinae, very obtusely carinate longitudinally. The inner (upper) surface of the chela is covered with long, fine hairs. The fingers of the female have the usual slender form and are as long as or a little 240 shorter than the palm ; the dactylus is, however, distinctly ridged longitudinally above, from the articulation to the tip. The palm bears no tracé of a transverse groove near the articulation of the fingers, but the teeth at either side of the articulation are present, like in the male, and the inner (upper) surface of the chela is also hairy. The large chela fully agrees with Coutière's figure 274, p. 226, 1. c. In an adult, ova-bearing female from Stat. 131 the carpal segments of the 2nd legs are respectively 1,5 mm., 1,68 mm., 0,6 mm., 0,6 mm. and o, 86 mm. long; the chela is 1,341:1111. long and the fingers are one and a half as long as the palm. In the 3ld and 4th legs one observes a movable spine near the proximal extremity of the lower border of the ischium ; the merus bears a strong, subapical, acute tooth 011 the lower margin and the lower margin of the carpus ends in two acute teeth, of which the outer is broader but shorter than the other. Propodus of 3rd pair 6-times as long as broad, with 7 spines on the lower margin, another row of 6 spines close to the former on the outer side and also a spine at the far end of the upper margin. Dactylus slender, tapering, measuring one-third the length of the propodus. General distribution: Asiatic seas (H. Milne-Edwards) ; Amboina (Zehntner). f29. Alphcits praedator de Man. J. G. DE Man, in: Notes from the Leyden Museum, Vol. XXX, 1908, p. 103. Stat. 181. September 5/1 1. Ambon. Reef. 1 specimen. A n ew species of the Insignis subgroup, closely related to A. bidens (Oliv.) = tridentattis Zehntner. The single specimen collected is 14 mm. long; it is perhaps a young female, because the fingers of the small chela are not Bahemceps-shaped, while this is the case in the male of the closely allied A. bidens. Rostrum pointed, acute, narrow, half as broad at its base as it is long, slightly directed upward and reaching to the middle of 2nd antennular article. As in A. bidens, the rostral carina is interrupted at the anterior third of the carapace (rostrum excluded); the interorbital portion, partly concealed by the eye-hoods from which it is separated by deep grooves, half as broad as the corneae, is strongly compressed, sharp-edged and, differently from A. bidens, arises, between the posterior end of the corneae and the interruption, as a high, arcuate crest. Immediately behind the interruption one observes an obtuse tubercle like in A. bidens and this tubercle is prolonged, in the mid-line of the carapace, into a straight obtuse crest, that extends to the posterior third of the carapace (rostrum excluded) ; this crest is bounded at either side by a shallow groove or depression, which also ends abruptly at the posterior extremity of the crest, so that the latter shows the same height along its whole length. \ iewed at from above the crest appears thicker than that part of the rostral carina, which is situated in front of the interruption. Just as in A. bidens, one observes, at either side of the rostral carina, between the corneae and the median tubercle, a pointed tooth, broad and flattened at its base, the acuminate tip of which is slightly directed inward; the sharp-edged, concave, inner margin of these teeth extends to a little behind the median tubercle, but the 241 SIBOGA-EXPEDITIE XXXIX tf '. 48 374 outer margin is much shorter. Like in A. bidens, the orbital region is very broad, occupying four-fifths of the anterior margin of the carapace, the eye-hoods end anteriorly in an obtuse tubercle and one observes also, between that tubercle and the rostrum, a rounded prominence that reaches a little farther forward than the tubercle of the eye-hoods. Telson twice as long (2 mm.) as broad anteriorly (1,05 mm.), distance (0,7 mm.) between the postero-lateral angles one-third of the length ; spinules of the upper surface large, the anterior pair situated at the anterior third, the posterior pair a little farther distant from the posterior margin than from the anterior pair. The two spines of the basal joint are of equal length, the outer twice as broad as the inner. Second antennular article one and a half as long as broad, little longer than the visible part of the ist, which is as long as the 3rd; like in A. bidens the anterior margin of the ist article bears 2 spines. Stylocerite ending in a spine that is directed out war d and that reaches as far forward as the spines of the ist article, i. e. to the 2nd fourth part of 2nd antennular article. Lower spine of the basicerite small, hardly reaching as far forward as the base of the spine in which terminates the stylocerite ; carpocerite as long as the antennular peduncle. The scaphocerite, the outer margin of which is decidedly concave, projects beyond the end of the antennular peduncle by half the 3rd article ; the terminal spine, the tip of which is curved inward, is a little more than half as long as the scaphocerite, projects with one-third of its length beyond the tip of the blade, that reaches to the end of the antennular peduncle, and the spine appears 3-times as long as its base is broad. The base of the spine is as broad as the contiguous part of the blade. External maxillipeds extending as far forward as the carpocerite-, penultimate joint one and a half as long as thick, the seta at the far end of the upper margin 3-times as long; terminal joint almost twice as long as the penultimate and almost 4-times as long as broad at its base. Merus of the large cheliped stout, deeply concave at the distal extremity, the upper margin terminating in a triangular, acute tooth ; the greatest width anteriorly of the outer surface is a little more than half its length. Infero-external margin of the merus rather coarsely denticulate or serrulate along its whole length, infero-internal with an acute tooth at the distal end; margins of the distal tooth of the upper margin with two or three setae. Large chela turned ontward, 6 mm. long, ' one-fifth longer than the carapace; palm measuring three-fifths the length of the chela, the height (2,25 mm.) of its outer (lower) face a little more than one-third the length of the chela and equal to the length of the fingers. Upper (outer) border of the palm the thickness of which is in proportion to its height like 3 : 4, marked with a narrow, deep groove, near the articulation of the dactylus, as in A. bidens, but this groove is continued on the outer (lower) face of the palm to near the entire and rounded lower border of the latter. From the middle of this external portion of the groove a broad, though shallow depression extends almost to the middle of the palm, to near the obtuse tip of the triangular area, the upper boundary of which is arcuate, the lower nearly straight. The upper (outer) border of the palm is rounded and ends obtusely. The dactylus is still more turned outward than the palm, so that the articulation is situated in the plane of the outer (lower) surface of the palm and the upper border of the dactylus situated almost inferiorly. 242 .)/ 5 At eithcr side of the articulation the palm ends in an obtuse tooth, the tooth at the end of the upper (outer) border being larger than the other; immobjle finger shorter than the dactylus and longitudinally grooved on its outer (lower) face. On the outer (lower) surface of the palm a few short hairs are inserted, but the inner (upper) is more hairy, especially on its upper (outer) portion and on the immobile finger. Lower (inner) border of the chela rounded, entire. Merus of the small cheliped less broad in proportion to its length than that of the larger, upper margin terminating in an acute tooth, infero-internal unarmecl. Chela half as long as the larger, also turned ontward; fingers conical, shutting together, as long or hardly shorter than the palm, the margins of which are parallel, entire; inner (upper) surface of palm and fingers hairy. Carpal segments of the second legs i mm., 1,1 mm., 0,32 mm., 0,36 mm. and 0,54 mm. long; chela 1,06 mm. (palm 0,46 mm., fingers 0,6 mm.). The carpus much resembles that of A. bidens, but the chela is twice as long as the 5th segment, in A. bidcns only one and a half. Ischium of 3rd and 4"' legs with a strong, movable spine. These legs are of a stouter shape than those of A. bidens. So e. g. the meri of 3rd legs are 2,4 mm. long and 0,6 mm. broad in the middle, 4-times as long as broad. As well in the 3ld as in the 4th legs the meri are armed with a strong, acute, apical tooth ; posterior margin of the carpus with t w o acute teeth at the distal extremity, as in A. bidcns, anterior margin with a few long setae. Propodus of 3rd legs straight, slightly narrowing, one-third longer than the carpus and 4,5-times as long as wide, appearing also of a less slender form than in A. bidens \ posterior margin with 7 strong spines and with another row of shorter spines near them, there is also a spine at the far end of the setose, anterior margin. Dactylus of 3rd legs measuring two-fifths of the propodus, 5-times as long as thick at base, slightly curved, simple. f30. Alphens bicostaitts de Man. J. G. de Man, in: Notes from the Leyden Museum, Vol. XXX, 1908, p. 102. Stat. 37. March 3031. Sailus ketjil, Paternoster-islands. Close to reef. 27111. and less. Coral and coralsand. 1 male and 4 egg-bearing females. Stat. 99. June 28/29/30. 6°7'.5N., I20°2Ó'E. Anchorage off North-Ubian. 16 — 23 m. Litho- thamnion. 1 adult egg-bearing female and 7 young specimens, 6 of which were collected at the surface. Stat. 205. September 20. Buton-strait, between floating seaweed. 1 adult male and 1 ova- bearing female. A new species of the Insignis subgroup of Coutière, closely related to A. bidens (Oliv.), A. cristatus Cout. and A. praedator de Man. The rostrum, acute and narrow, reaches to the distal fourth or fifth of the visible part of ist antennular article or extends to the end of this article, sometimes even just beyond it, as in the egg-bearing female from 'Stat. 37. Rostral carina subacute, sometimes rather obtuse and less prominent than the orbits, so that in a lateral view of the carapace the carina is partly concealed by the orbital hoods. The rostral carina usually extends backward as far as a small 243 376 median tubercle, which, as in A. bidens (Oliv.), is situated immediately behind the base of the orbits : sometimes, however, the rostral crest reaches only as far as the origin of the two oblique, lateral carinae, between which the carapace appears then flat and even. From the small tubercle a low, obtuse, median carina runs backward to the middle of the carapace, more conspicuously in young specimens than in the adult. Just midway between the median tubercle and the anterior margin of the carapace, at either side of the rostral carina, a thin lamellar crest runs obliquely backward from the rostral carina to the level of the median tubercle; these two crests, the upper edge of which is rather sharp and that are marked with 2 or 3 violet spots, are bounding, posteriorly and from the inner side, the rather deep grooves or depressions which separate the orbits from the rostral carina. The two crests or ribs from which the specific name is derived, make an angle of nearly 450 with the rostral carina. The orbital hoods that are rather much prominent, terminate anteriorly in an obtuse tubercle, about as in A. bidens \ just near that tubercle and separated from it by a notch or emargination the frontal margin carries, at either side of the rostrum, a slender spine like in A. cristatus (vide: Coutière, Les Alphéidae, 1899, p. 89, fig. 56); these spines measure one-third the length of the rostrum. Between the rostrum and either spine the frontal margin runs S-like and is fringed with long setae that reach to the end of ist antennular article. Orbito-antennal groove deep. According to Coutière (Les Alphéidae, 1899, p. 79 and p. 336) a pterygostomian spine should not occur in the genus AlpJicns. A. bicostatus appears now quite remarkable by the existence ofa well-developed, acute, though small, pterygostomian spine. Second article of the stout antennular peduncle as long as the visible jjart of the ist, sometimes slightly shorter, sometimes slightly longer, 3rd article two-thirds of the 2nd; anterior margin of the articles with long setae, anterior margin of ist article not bearing the spines which in A. bidens are found here. Stylocerite terminating in a slender spine, that just reaches beyond the ist antennular article. Basicerite with a small, infero-lateral spine, that reaches almost to the tip of ist antennular article; carpocerite stout, distinctly shorter than the antennular peduncle, reaching to the 2nd third or to the middle of the 3ld article. Like the antennal and antennular peduncles, the scaphocerite also resembles that of A. bidens \ the lateral spine, in which the concave, outer margin terminates and which is slightly curved inward, reaches distinctly beyond the tip of the antennular peduncle, while the blade, fringed with hairs, is just as long as that peduncle. Merus of the large cheliped of the male rather stout, its outer face twice as long as broad ; both the upper and the inner margin end in an acute tooth, but they are for the rest entire and unarmed. The large chela of the male, which much resembles that of A. bidens, is half as long as the body and turned outward, the dactylus being placed at the outer side; viewed at from above, the chela appears little more than 3-times as long as the upper (inner) face of the palm is broad. This chela is perfectly smooth, but the upper (inner) side is slightly hairy; the rounded, outer (upper) border of the palm bears a narrow, transverse groove, just near the articulation of the dactylus, as in A. bidens, and this groove is not broader than the base of the dactylus; inner or lower border of the chela rounded, straight and entire. Fingers little more than half as long as the palm, dactylus compressed, slightly longer than the immobile 244 377 finger, tip of the latter rather obtuse. The large cheliped of the female agrees with that of the male, but the merus is a little less broad in proportion to its length and the length of the chela is only one-third that of the body. Merus of the small cheliped of the male a little less broad in regard to its length than that of the larger, outer face 2,5-times as long as broad; the upper margin ends in a pointed tooth, but the inner is unarmed. The carpus and the chela, which also shows the Balaeniceps- form, closely resemble those of A. bidens, but the palm bears no tracé of a transverse groove near the dactylus and the leaf-shaped, upper face of this finger is com paratively broad er than in the male of A. bidcns. In the male of A. bidens from Stat. 133 the length of this upper part of the dactylus is in proportion to its width as 26:10, in A. bicostatus, however, as 18 : 10. In A. bidens this upper face of the dactylus appears convex transversely, but in A. bicostatits rather flattened. The small cheliped of the female resembles that of A. bidens, the conical fingers are but little shorter than the palm, that presents no tracé of a transverse groove near the dactylus; the upper (inner) face of the chela is hairy, as in the male.' In the right leg of the second pair of the male (from Buton-strait) the carpal segments are 1,2 mm., 1,45 mm., 0,56 mm., 0,68 mm. and 0,8 mm. long, the chela is 1,32 mm. long (palm 0,54 mm., fingers 0,78 mm.); in the left leg these numbers are, in the same succession, 1,2 mm., 1,3 mm., 0,56 mm., 0,66 mm. and 0,76 mm., the chela just as long as in the other leg. The second segment appears little longer than the first, in the right leg the difference is larger than in the left. Ischium of 3rd legs with a strong, movable spine. Merus 4,5-times as long as wide in the middle, with a strong acute tooth near the far end of the posterior margin ; carpus about half as long as the merus, posterior margin ending in an acute tooth, anterior with some long setae. Propodus slender, with 6 — 8 spines on the posterior margin and some others near the margin on the outer face; anterior margin setose, with 2 or 3 long and strong setae at the distal extremity. Dactylus slender, simple. Fourth legs as the 3rd, but the merus comparatively less broad. The distal third part of the dactylus of the large cheliped and the tip of the other finger are violet; the fingers of the small cheliped of the male are marked with violet spots at their margins, while in the female these fingers are violet on the distal third part with paler tips. Length of the male 18,5 mm., of the female 20,5 mm.; the smallest, egg-bearing specimen is 14,5 mm. long. 31. Alphens insignis Heller. Alpheus insignis C. Heller, in: Sitzungsber. Kais. Akad. Wiss. Wien. Bd. XLIV, 1861, p. 269, Taf. III, figg. 17, 18. Alpheus insignis J. G. de Man, in: Abhandl. Senckenb. Naturf. Gesells. XXV, 1902, p. 864, Taf. XXVI, figg. 60, 60a, 60b. Alpheus insignis H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 899. Stat. 78. June 1011. Lumu-Lumu-shoal, Borneo-bank. Reef. 1 male and 1 female without eggs. 245 378 The male is 17 mm. long, this species attains the length of 20 mm.; the female that has lost the left larger cheliped, measures 12,5 mm. In the male the rostrum reaches to the middle, in the female nearly to the end of ist antennular article. In the female the rostrum appears a little narrower than in the male ; at the middle of the corneae the rostrum appears, in the female, a little less broad, but in the male slightly broader than the distance between the concave, lateral margins and the corneae, the female agreeing with that from Ternate, figured by me 1. c. Fig. 60. In the male the small cheliped is placed at the left, in the female at the right side. In the male the carpal segments of the right leg of the second pair are 1,1 mm., 1,16 mm., 0,4 mm., 0,42 mm. and 0,7 mm. long, the chela is 1,34 mm. long (palm 0,6 mm., fingers 0,74111111.). In the female these numbers are: 0,8 mm., 0,9 mm., 0,36 mm., 0,34 mm. and 0,5 mm.; the chela is 1,02 mm. long (palm 0,5 mm., fingers 0,52 mm.). General distribution: Red Sea (Heller, de Man); Eritrea (Nobili); Djibouti (Coutière) ; Mallicolo (Coutière) ; Mauritius (Richters) ; Mahé (Coutière) ; Maldives and Laccadives (Coutière); Ternate (de Man); Amboina (de Man); New Guinea, Beagle Bay (Nobili); Samoa (Coutière). f32. Alphens PJiiloctetes de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 103. Stat. 240. November 22 till December 1. Banda-anchorage. Black sand, coral and Lithothamnion- bank in 18 — 56 m. 1 specimen. A new species apparently belonging to the Lnsignis subgroup for, though the large cheliped is missing, it appears closely related to A. Lanceloti Cout., a species inhabiting the Maldive and Laccadive Archipelagoes. From this species A. PJiiloctetes, however, at first sight differs by the meri of the 3rd and 4* legs that are armed with an acute tooth at the distal extremity of their posterior margin. Rostrum acute, as long as broad at its base, projecting straightly forward almost to the end of ist antennular article; upper margin of the rostrum rather sharp, like the interorbital part, which, separated by narrow grooves from the rounded, unarmed, orbital hoods, becomes posteriorly obtuse, gradually widening and reaching to the end of the orbits; as in A. Lanceloti the integument appears, at either side of the rostrum, anteriorly rather thin. Frontal maro-in straight, transverse as in A. Lanceloti. The telson closely resembles that of this species. As it is 1,86 mm. long and the posterior margin 0,64 mm. wide, the telson appears, like in A. Lanceloti, almost 3-times as long as the posterior margin is broad and anteriorly it appears just one and a half as broad as the posterior margin ; the form is also quite the same. The anterior pair of spinules, lono- 0,24 mm., of the upper surface are twice as far distant from the posterior margin as from the base and the distance, 0,48 mm., between the two pairs is one-fifth shorter than the clistance, 0,6 mm., of the anterior pair from the base of the telson; the spinules of the anterior pair are one and a half as far clistant from one another as those of the posterior. Of the two spines near the postero-lateral angles the inner ones are as long as in A. Lanceloti, namely just 246 379 half as long as the posterior margin is broad; between these spines the margin is armed with a dozen of movable spinules that measure one-third the length of the longer inner spines near the postero-lateral angles and below these spines the long plumose setae are inserted. Spines of the basal joint of swimmerets large, the outer somewhat longer than the inner. Second antennular article almost twice as long (0,56 mm.) as thick (0,32111111.) and one-fifth longer only than the visible part (0,46111111.) of ist article; 31''1 article a little shorter than the visible part of the ist. Stylocerite terminating in a spine, that just reaches beyond the ist article. Basicerite with a well-developed spine, long 0,2 mm. Carpocerite just as long as the antennular peduncle, not longer, scaphocerite resembling that of A. Lanceloti and reaching a little beyond the peduncles. Terminal joint of external maxillipeds almost 3-times as long as broad at its base. Ischium of the small cheliped with two microscopical, movable spinules on the lower margin, the anterior, 0,06 mm. long, 011e and a half as long as the posterior. Merus 3,5-times as long as broad, upper margin unarmed; infero-internal margin armed with four movable spinules, that progressively increase in length, the ist or proximal spinule being 0,07 mm. long, the 4th 0,22 mm., and with a hardly visible, rudimentary tooth or spine at the far end. Carpus and chela as in A. Lanceloti, chela somewhat more than 4-times as lone as hieh; fineers as lone as the palm, the latter with a small obtuse tooth at the far end at the inner side, near the articulation of the dactylus; lower half of the palm and immovable finger hairy. The very slender left leg of the second pair (the right is missing) is 2,2-times as long as the carapace, rostrum included; the merus, 2,5 mm. long, is 1 4-times as long as broad. Carpal segments 0,84 mm., 1,2111111., 0,62 mm., 0,76 mm. and 0,5 mm. long, the second segment 8-times, the third 4-times as long as thick; chela 0,88 mm. (palm 0,38111111., fingers 0,5 mm.) long. The second segment of the slender carpus is almost one and a half as long as the first and the fourth is not shorter, but one and a half as long as the fifth ; the fingers which, according to Coutière's figure 39 c should be shorter than the palm in A. Lanceloti, are in this new species distinctly longer than it, almost one and a half as long. Ischium of 3"1 and 4* legs with a strong movable spine, long 0,32 mm. Merus of yd legs f i v e t i m e s as long as broad in the m i d d 1 e , its posterior margin armed with four movable spinules that increase in length; the very small first spinule is 0,07111111. long, the second 0,1 mm., the third o, 13 mm., the fourth o, 15 mm., the length of the last hardly more than one-third the width of the joint; the third is as far distant from the distal extremity as the second from the proximal one. At the distal extremity this margin terminates in a small, though q u i t e cl i s t i n c t , acute tooth, as in A. Mier si ; carpus slender, unarmed, 4-times as long as thick distally, its anterior margin with some setae, one of which near the far end is as long as the carpus itself. Propodus 6-times as long as broad, 1,25-times as long as the carpus, its posterior margin with 6 pairs of spinules ; both margins are setose, two or three setae near the anterior margin are plumose. Dactylus two-fifths of the propodus, half as long as the carpus, sim pi e. Merus of 4th legs also 5-times as long as broad, resembling that of the 3rd, but its posterior margin with three, instead of four, movable 247 38o spinules; following joints as in the 3rd legs, but the lower margin of the carpus ends in an acute tooth. Length of the single, probably young specimen, 14 mm. Remarks. Alpheus Mier si Cout. differs at first sight by the less slender form of the carpal segments and by the meri of 3ld and 4th legs bearing no movable spinules. The unknown large chela will perhaps show still other differences, also from A. Lanceloti. n -7 00- Alpheus gracilipes Stimps. Alpheus gracilipes W. Stimpson, in: Proc. Acad. Nat. Scienc. Philadelphia, 1860, p. 31. Alpheus gracilipes E. J. Miers, in: Report Zool. Coll. of H. M. S. "Alert", 18S4, p. 287. Alpheus gracilipes J. G. de Man, in: Archiv f. Naturg., 53. Jahrg. 1888, p. 500, Taf. XXI, fig. 5 and in: Abhandl. Senckenb. Naturf. Gesells. Bd. XXV, 1902, p. 864. Alpheus gracilipes A. Ortmann, in: Zoolog. Jahrb. V, Abth. f. Syst. 1890, p. 488 and in: Jenaische Denkschriften VIII, 1894, p. 15. Alpheus gracilipes H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 901. Nee: Alpheus gracilipes J. Thallwitz, Decapoden-Studien. Berlin, 1891, p. 21. Stat. 115. July 9/1 1. East side of Pajunga-island, Kwandang-bay. Reef. 4 specimens, 2 of which are egg-bearing. Stat. 152. August 12/13. Wunoh-bay, N.W. coast of Waigeu-island. Reef. 1 young specimen. Stat. 154. August 14. o°7'.2N., i30°25'.sE. Bougainville-strait. 83 m. Grey muddy sand, shells and Lithothamnion. 1 egg-bearing female. Stat. 209. September 23. Anchorage off the south point of Kabaëna-island. 22 m. Coarse sand. 1 egg-bearing female. As in A. diadema Dana and A. insignis Heller, the antennal peduncle appears, in this species, much shorter than the scaphocerite and reaches only to the tip of 2Dd antennular article: in other species of this subgroup, as in A. Lanceloti Cout., A. paracrinitus Miers var. bengalensis Cout., A. alpheopsides Cout. and A. paralpheopsides Cout. the antennal peduncle is longer than the scaphocerite. The largest specimen from Stat. 115 is a male, long 25,5 mm. The rostrum reaches to the end of ist antennular article and its upper surface is decidedly concave. Only the small cheliped, at the left side, is present. The upper margin of the merus ends in an acute tooth, the outer margin is unarmed, but the inner bears 2 small spinules on its proximal half and a sharp tooth at the distal end, which, however, is smaller than that of the upper maroïn. The fingers are a little shorter than the palm, which is marked with a transverse groove just behind the articulation of the dactylus; the latter presents the Balaenieeps-fovm and the chela appears a little more than 4-times as long as broad (high). The two egg-bearing females are 20 mm. long. The female without eggs from Stat. 152 is 13111111. long. The large chela is not yet as slender as in the adult, being only about 3-times as long as high. The female from Stat. 154 is 27,5 mm. long. There is a larg-e cheliped lying loose in the tube, which 110 doubt belongs to this specimen. The upper margin of the merus ends in a small sharp tooth, that is much smaller than the acute tooth at the apex of the inner margin ; between this tooth and the ischium the inner margin bears 3 or 4 smaller spinules, 24S 33i the o uter margin is unarmed but Lts distal extremity is rather sharp. The chela, 8,6 mm. long, closely resembles the figure 277 in Coutière's work: Les Alpheidae, 1899, p. 228. The propodi of the 3rd and 4lh legs are armed with 10 spinules. The egg-bearing female from Stat. 209 is 16,5 mm. long. General distribution: Tahiti (Stimpson, Heller) ; Marquesas Islands (Ortmann) ; Samoa Islands (Ortmann) ; Hawaüan Islands (Coutière) ; New Caledonia (Coutière) ; Ternate (de Man); Amboina (de Man); Bay of Batavia (de Man); Ceylon (Miers); Maledive Islands (Coutière); Mahé (Coutière); Djibouti (Coutière); Dar-es-Salaam (Ortmann). f 34. A/pheus tetmicarpus de Man. J. G. DE Man, in : Notes from the Leyden Museum, Vol. XXX, 1908, p. 104. Stat. 114. July 8. o°58'.5 N., I22°55'E. Kwandang-bay-entrance. 75 m. Hard sand, very fine. 4 specimens, 1 of which is a male and 2 of which are egg-bearing. Stat. 311. February 12/13. Sapeh-bay, East coast of Sumbawa. Depth up to 36 m. Mud and sand. 1 egg-bearing female. A species of s m a 1 1 s i z e , appertaining to the Insignis subgroup or perhaps to the Brevirostris group and related to A. paralphcopsidcs Cout., a species that inhabits the Laccadive Archipelago. The male attains a length of 13 mm., while the female becomes 13,5 mm. long. Frontal margin as in A. paralphcopsidcs. Rostrum pointed, acute, one-third longer than broad at its base and separated from the orbital hoods by a deep emargination, the lateral or outer margin of which makes a distinct angle with the anterior border of the orbits ; the rostrum almost reaches to the middle of the visible part of ist antennular article. Rostral carina sharp, little prominent, not reaching farther backward than the base of the orbits. Corneae rather large. Telson narrow, a little more than twice as long as broad anteriorly and 4-times as long as its posterior margin is broad ; the two pairs of spinules are rather large and placed close to the lateral margins, anterior pair a little nearer to the base than to the posterior margin, posterior pair midway between the latter and the anterior pair; posterior margin arcuate, inner subterminal spines little more than half as long as this margin is broad. Second antennular article twice as long as thick, as long as the visible part of the 1 st and one and a half as long as the 3rd; stylocerite terminating in a pointed spine that almost reaches to the end of ist antennular article. Lower spine of the basicerite small, hardly reaching as far forward as the rostrum ; carpocerite extending beyond the tip of the antennular peduncle by the length of 3rd article ; scaphocerite 3-times as long as broad, its outer margin very slightly concave, the apex of the blade reaching to the end of the antennular peduncle, while the terminal spine that extends but little beyond the blade, reaches almost to the tip of the carpocerite. Outer margin of the antepenultimate joint of external maxillipeds ending in a spiniform tooth; penultimate joint quadrate, as long as broad; terminal joint 3-times as long as the penultimate and 3-times as long as broad at its base, narrowing tovvards the distal extremity, that bears some setae twice as long as the joint itself. 249 SIBOGA-EXPEDITIE XXXIX a'. 49 382 Merus of the large cheliped of the male 3,5-times as long as broad, upper margin unarmed at apex, infero-external margin finely serrulate, infero-internal with 4 aciculiform spinelets and ending in a small acute tooth. Chela obliquely turned ontward, one and a half as long as the carapace (rostrum included) and about 3-times as long as high, the palm presenting its greatest heio-ht (or breadth) at one-fourth from the carpal articulation. The palm, distinctly compressed, beino- half as thick as high, narrows toward the articulation of the fingers, that are almost half as long as the palm; upper border of the palm entire, without a transverse groove, appearing finely granular under a lens until near the articulation of the fingers that are smooth. Both the upper and the lower border are fringed with hairs at the inner side, like in other species. Dactylus a little longer than the immobile finger. In the female specimens the large cheliped is missing. Of the small cheliped of the male the merus is 4-times as long as broad, upper margin unarmed at the apex, infero-external margin serrulate, infero-internal with 5 aciculiform spinelets, the extremity unarmed. Chela a little shorter than the larger, one-fourth longer than the carapace; palm as long as the fingers, almost 3-times as long as high, somewhat compressed, very slightly granular, upper border without a transverse groove. Fingers slender, dactylus Ba/aemcefis-shaped. In an egg-bearing female from Stat. 114 the merus of the small cheliped is almost 5-times as long as broad, for the rest it aorees with that of the male, but it presents a small acute tooth at the fal- end of the infero-internal margin. Chela shorter than the small chela of the male, as long as the carapace without the rostrum; fingers slender, tapering, shutting together when closed, a little (one-seventh) longer than the palm, which is 3-times as long as high and somewhat compressed. Like in the male, both margins of the chela are fringed with hairs at the inner side. In the adult male from Stat. 114 the carpal segments of the 2nd legs are 0,9 mm., 1,26 mm., 0,45 mm., 0,46 mm. and 0,44111111. long; the 2nd segment is 9-times as long as thick and the chela is 0,8 mm. long (palm 0,3 mm., fingers 0,5 mm.). In an egg-bearing female from the same station the carpal segments are 0,94 mm., 1,22 mm., 0,48 mm., 0,48 mm. and 0,46111111. long, while the 2nd segment is also 9-times as long as thick; chela 0,78 mm. long (palm 0,3 mm., fingers 0,48111111.). These numbers prove that the 2nd segment is one- third Ion o-er than the ist, that the three last segments are equal, half as long as the first, that the chela is a little shorter than the ist segment, that the fingers are one and a half as long as the palm and that the carpus has a very slender form, the 2nd segment being 9-times as long as thick. It is from the slender form of the carpus that the specific name is derived. Ischium of 3rd and 4th legs with a movable spine. Merus of 3rd legs unarmed, slender, 8-times as long as broad ; carpus half as long as the preceding joint, propodus little longer than the carpus (proportion 1,2), very slightly curved and somewhat narrowing towards the distal extremity; both margins of the propodus which is 9-times as long as broad in the middle, are beset with long setae while one observes 5 or 6 spinules along the posterior margin. Dactylus lanceolate, slightly arcuate, about half as long as the propodus, decidedly broader in the middle than high. Merus of 4th legs one-fourth shorter than that of the 3rd pair. 250 5°ó t 35- Alpheus sp. Stat. 51. April ig. Madura-bay and other localities in the southern part of Molo-strait. 54 — 90 m. Fine grey sand, coarse sand with shells and stones. 1 specimen. This specimen, perhaps a male, long 16 mm., appears closely related to A. tenuicarpus de Man, hut I wish to describe it separately, because it shows some differences. The acute rostrum that reaches to the middle of the visible part of ist antennular article, appears at its base slfghtly broader than it is long and the concavities at either side are shallow, not so deep as in A. tenuicarpus and A. paralpheopsid.es. Rostral carina as in A. tenuicarpus , telson also, but the spinules of the upper surface are a little farther distant from the lateral margins. First antennular article a little shorter than in A. tenuicarpus, distinctly shorter than the 2nd, which, like in this species, is twice as long as thick and one and a half as long as the 3ld. Stylocerite, carpocerite and scaphocerite as in A. tenuicarpus. Merus of the large cheliped 4-times as long as broad, upper margin unarmed at apex, infero-external margin serrulate, infero-internal margin with 2 aciculiform spinelets and ending in an acute tooth. Chela 6,6 mm. long, about one-fourth longer than the carapace, its form more si en der than that of A. tenuicarpus, because it is 4-times as long as high; it narrows also in a less degree than in this species, with which it agrees for the rest, the palm being 4,6 mm. long, a little more than twice as long as the fingers. Unfortunately the smaller cheliped is missing. Carpal segments of 2nd legs 1 mm., 1,22 mm., 0,44 mm., 0,44 mm. and 0,48 mm. long, chela 0,85 mm. long (palm 0,36 mm., fingers 0,49 mm.), while the 2nd segment is 8-times as long as thick : these numbers prove that the carpus also much resembles that of A. tenuicarpus. Legs of the 3rd and 4'11 pair similar to those of this species. Ischium with a movable spine. Merus of 3ld legs unarmed, 7-times as long as broad; propodus as in A. tenuicarpus, but 1, 4-times as long as the carpus ; dactylus two-thirds of the propodus. f36. Alpheus tenuipes de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1910, p. 288. Stat. 204. September 20. 4°2o'S., I22°58'E. Between islands ofWowoni and Buton; northern entrance of Buton-strait. From 75 — 94 m. Sand with dead shells. 2 specimens, one of which with eggs. A new species of the Insignis subgroup, closely related to A. paracrinitus Miers and to its variety bcngalensis Cout. (Confer: H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 901, PI. LXXXII, Figs. 37, 38). Rostrum triangular, acute, as long as wide at its base, a little shorter than half the visible part of basal antennular article; rostral carina obtuse, short, reaching only to the posterior end of the corneae and separated by feeble depressions from the orbital hoods that are rounded and unarmed. Frontal margin almost transverse, orbits not prominent, the frontal margin 2Si 3§4 appearing only slightly concave at either side of the rostrum. The orbits are quite open anteriorly and the eyes that reach with their corneae to the anterior margin of the orbits, are perfectly visible from before; as in A. alpheopsides, the rostrum is not thickened inferiorly, but one observes a narrow tooth that arises from between the eyes but that does not extend upward as far as the rostrum. Pterygostomian angle obtuse. The telson is much more nar r o wed backward than that of A. paracrinitus or A. alpheopsides and much resembles that of A. paralphcopsides Cout., as is proved by the Table of measurements, but, while in A. paralpheopsides the telson is 4-times as long as the posterior margin is broad, it is almost 5-times in A. tcnuipes. Spinules of the upper surface o, 14 mm. long, situated as in A. paralphcopsides. In the larger specimen that unfortunately has lost all its legs, the antennular peduncle is 5-times as long as thick in the middle; the 2nd article, twice as long as thick, appears one-fourth longer than the visible part of the ist, while the 3rd or distal article appears a little more than half as long as the 2nd and one-fifth shorter than the visible part of the ist. The other specimen only differs by the meclian article being about as long, but not longer than the visible part of the ist. Stylocerite pointed, as long as basal antennular article. Basicerite with a very small spinule at the lower side. Carpocerite 4,2 — 4, 4-times as long as thick, reaching beyond the tip of the antennular peduncle by half the 3vd article. Scaphocerite as in A. paracrinitus var. óeuga/ensis, but shorter, the blade reaching in the larger specimen to the middle of 3rd antennular article, while the terminal spine which is slightly curved inward, hardly extends beyond the blade ; in the egg-bearing female the blade hardly reaches beyond the median article, but the terminal spine is a little longer, reaching almost to the middle of 3rd article. Ischium of the large cheliped of the egg-bearing female unarmed. Merus slender, 5-times as long as broad; upper margin unarmed at the apex, infero-internal margin with 4 small, movable spinules that slightly increase in length from the ist or proximal to the 4th and with a somewhat larger, immovable spine near the extremity. The large chela, which is as long as the carapace, viz. 4,42 mm., is just 4-times as long as high in the plane of the fingers and appears therefore a little more slender than that of A. paracrinitus var. bcngaknsis (Coutière, 1. c. Fig. 37#), with which it for the rest fully agrees, the palm being nearly cylindrical, unarmed and without a transverse groove. Merus of the small cheliped 6-times as long as broad, with 2 very small, movable spinules and with a somewhat larger, immovable tooth near the apex. The small chela resembles that of A. paracrinitns var. bengalcnsis\ it is but a little more than half as long as the larger, the proportion being as 1 : 1,67; the fingers are one-fifth longer than the palm, which is about 3-times as long as high and unarmed near the articulation of the fingers. The 2nd and the 4th legs are missing in this female. The legs of the 3"1 pair resemble those of the quoted species, but they are still more slender. The relative climensions are: merus 1,8; carpus i; propodus 1,44. Ischium with a strong movable spine near the base. Merus 8, 5-times as long as broad, carpus 6, 4-times as long as thick at the distal extremity; propodus 12-times as long as broad, with 4 or 5 spinules on the posterior margin and slightly ;35 setose; dactylus slender, 8-times as long as thick, half as long as die carpus and measuring almost two-fifths of the propodus. Ischium of 5th legs unarmed. Merus, carpus and propodus of subequal length, the carpus as much shorter than the merus as the latter is shorter than the propodus, the propodus being about one-tenth longer than the carpus ; dactylus measuring a little more than one-third of the propodus. Table of measurements. Proportion between length of telson and width of the posterior margin Proportion between the width at the base and that of the posterior margin Proportion between length of telson and the distance of the antenor pair of spinules from the posterior margin Proportion between the distances of both pairs from the posterior margin N° i the larger specimen long 13 mm.; N° 2 the female long 11,5 mm. N'> I. N° 2. 4,8 4,75 2,6 2,5 i.9 1.9 1,6 1,8 IV. Brevirostris group. 37. Alphen s rapax Fabr. Alpheus rapax J. C. Fabricius, Supplementum Entomologiae Systematicae, 1798, p. 405. Alpheus malabaricus F. Hilgendorf, in: Monatsb. Kgl. Akad. Wiss. Berlin, 1878, p. 832. Alpheus brevirostris J. G. de Man, in: Journal Linnean Society, London, Vol. XXII, 1888, p. 261, Alpheus rapax H. Coutière, Les "Alpheidae", Morphologie externe et interne etc., Paris, 1899, p. 233, fig. 284. Alpheus rapax J. G. de Man, in: Mémoires Soc. Zoolog. France, 1909, p. 147, PI. VII, figs. 1 — 8. Stat. 234. November 19/20. Nalahia-bay, Nusa-Laut-island. 46 m. Bottom stony. 2 adult specimens, one of which is egg-bearing. These two specimens have been fully described by me in a paper published in 1909 (1. c.) on some species of the genus Alpheus appertaining to the Brevirostris group, in which paper also the differences have been pointed out existing between A. rapax on one side and A. brevicristatus de Haan, A. brevirostris (Oliv.) and A. distinguendus de Man on the other. General distribution: Zanzibar (Hilgendorf); Djibouti (Coutière); Mergui Archipel- ago (de Man). f38. Alpheus brevirostris (Oliv.) var. angustodigitus n. Confer: H. Milne-Edwards, Hist. Nat. Cr'ust. II, 1837, p. 350 and J. G. DE Man, in: Mém. Soc. Zoolog. de France, 1909, p. 153 — 160 (passim in texto). Balikpapan, east coast of Borneo. 1 adult male and 1 adult, egg-bearing female collected by Mr. J. W. TlSSOT VAN PATOT and preserved in the Zoological Museum of the University of Amsterdam. Whereas the male is not injured at all, the female has lost all its legs excepting one of the 2nd pair. In the cited paper several observations regarding A. brevirostris (Oliv.) were published by me on Olivier's type specimen from New Holland, which courteously had been 253 386 entrusted to me by Professor Coutière of Paris. The two specimens from Balikpapan differ from the type species i° by the broader telson, 2° by the carpocerite being just as long as the antennular peduncle, 30 by the more narrow shape of the dactylus of the small chela of the male and 40 by the carpus of the 2nd legs presenting a somewhat less slender form and the 2nd segment being distinctly shorter than the ist. These specimens are therefore described as a variety of A. brevirostris, but they will perhaps prove to be specifically distinct, when we one day will be able to compare this variety carefully with specimens of the typical species. The typical A. brevirostris from New Holland is, indeed, as far as I am aware, only known by the descriptions of Ou vier and H. Milne-Edwards and by observations of Coutière and myself, all derived from Olivier's type, for this rare species has seemingly not yet been found back since it was described in the Encyclopaedie Méthodique. The male is 45 mm. long, the female 62 mm. While in the female the rostrum reaches just to the middle of the visible part of basal antennular article, it surpasses in the male very slightly the middle; the rostral carina, which is strongly compressed and acute and separated from the eye-hoods by rather broad and deep grooves, is traceable to the middle of the carapace, more distinctly in the larger specimen, the female, than in the other. As results from the Table, the telson appears a little broader with regard to its length than in A. brevirostris, but the telson of the male does not fully resemble that of the female. In the female the posterior margin appears a little wider in proportion to the length of the telson than in the male and in the male the posterior pair of spinules on the upper surface are situated nearer to the anterior pair than in the female. The inner antennae agree with those of the typical species and, both in the male and in the female, the terminal spinule of the stylocerite is distinctly directed outward. In both specimens the basicerite is armed with a small spinule at the lower side; the carpocerite. both in the male and in the female just as long as the antennular peduncle, extends in the male to the distal 3vd or 4th part of the terminal joint of the external maxillipeds, in the female, however, just as far as in the typical species, namely to the middle of the joint; the scaphocerite presents the same form and the same length as in the typical species. In the male the right cheliped is the larger. In both chelipeds the upper margin of the merus ends in a small, acute spine ; in both legs one observes a small spinule near the proximal extremity of the infero-internal margin, another similar spinule in the middle and a somewhat larger, though also rather small spine near the distal extremity. The large chela is 21,5111111. long and 8 mm. high, while the fingers are 8,25111111. long; height of the palm at the articulation of the dactylus 7 mm. The transverse groove behind the articulation of the dactylus is well-developed ; granulation of the palm rather fine, outer surface of the finoers almost smooth. Of the typical A. brevirostris the small chela of the male has been figured by Coutière in his important work : Les "Alphéidae", Paris, 1899, p. 230, Fig. 282, while I have figured the dactylus (1. c. Fig. 16). The small chela of the male from Balikpapan, however, closely resembles that of the male of A. distinguendus de Man, a japanese species which de Haan has described under the name of A. rapax (J. G. de Man, 1. c. Fig. 9); in the male from 254 387 Balikpapan this chela is 16,5 mm. long-, the palm is 5,25 mm. long and 4,511111-1. high at the articulation of the fingers, so that it appears slightly longer than high. The fingers that leave a hiatus between them when closed and that are excavate at the inner side, are thickly beset with hairs on their prehensile edges and on the inner side; they are twice as long as the palm. The dactylus, 2 mm. high at the outer side, appears, as in A. distinguendus, nearly 5-times as long as high and not 4-times as in the typical brevirostris ; the lower margin appears therefore also less strongly undulate than in the latter species. The outer and the inner side of the dactylus are fmely granulate and the granulation extends on the base of the immobile finger, but for the rest this finger and the dactylus are smooth. In both legs of the 2nd pair of the male the merus is 7,7-times longer than wide; in the female the merus is injured. Of the left leg of the male the carpal segments are 3,7 mm., 5,4111111., 1,3111111., 1,14111111. and 1,5 mm. long, the chela 2,8 mm. long (palm 1,28 mm., fingers 1,52111111.); in the right leg these numbers are, for the carpus : 3,7 mm., 3,5 mm., 1,3111111., 1,14111111. and 1,6 mm., for the chela 2,8 mm. (palm 1,2 mm., fingers 1,6 mm.). In the female the carpal segments are 4,4 mm., 3,7111111., 1,8 mm., 1,64111111. and 2 mm. long, the chela 3,3 mm. (palm 1,5 mm., fingers 1,8 mm.). In both legs of the male the ist segment is 5,6-times, the 2nd 5,6 to 5,8-times as long as thick at the distal extremity, in the female the ist segment 5, 5-times, the 2nd almost 5-times. Differently from the typical species the 2nd segment appears a little shorter than the ist and the carpus shows also a less slender form, for in the New Holland species the 2nd segment is described as being about 7-times as long as wide (J. G. de Man, 1. c. p. 156). The 4th segment appears constantly a little shorter than the 3ld and the 3rd a little shorter than the 5th ; the fingers are slightly longer than the palm. Merus of 3rd legs in the male 4, 5-times longer than wide. Table of measurements in millimeters. Length of the telson Width at the base Width of the posterior margin Proportion between the length of the telson and the width at the base Proportion between the length of the telson and the width of the posterior margin . Proportion between the length of the telson and the distance of the antenor pair of spinules hom the posterior margin Proportion between the distances of both pairs of spinules from the posterior margin . N° 1 and N° 2 Balikpapan; N° 3 type of A. brevirostris (Oliv.) from the Paris Museum. N° 1. d" N° 2. 9 6 7-75 3.5 4-7 2,2 3-25 i.7 1,65 2,72 2,38 i.7 1,65 1,27 1-57 N° 3- C? 6,8 3-5 i.94 f39. Alphejis barbatus Cout. Alpheus barbatus H. Coutière, in: Buil. Mus. Paris, 1S97, N° 6, p. 235 and in: Les "Alphéidae", Morphologie externe et interne etc. Paris, 1899, p. 230, figs. 279, 280 and in: Alpheidae Mald. and Laccad. Archip. 1905, p. 906. Stat. 34. March 27. Anchorage off Labuan Pandan, Lombok. Coralreef. 1 young specimen. Stat. 142. August 5/7. Anchorage off Laiwui, coast of Obi Major. Reef. 1 young specimen. 255 388 Stat. 311. February 12/13. Sapeh-bay, East coast of Sumbawa. Reef. 1 specimen of medium size, probably a male. It is rather incomprehensible that Coutière in his diagnosis, in which he only deals with the shape of the two chelae of the ist pair of legs and with the coloration, does represent this species as related to A. socialis Heller from New Zealand, the characters of which are quite different and to which A. barbatus resembles not at all. I am very much obliged to Professor Coutière for having enabled me to examine the type specimens of A. barbatus, collected by him at Djibouti, (two specimens without the legs, four larger chelipeds, one small cheliped of a male and one of a female, and legs of the following pairs). The examination of these specimens proved that A. barbatus is not only characterized by the shape of the first pair of legs, but also by that of the following and by the features of the rostrum and of the two pairs of antennae. Unfortunately no adult or egg-bearing specimens were collected by the "Siboga" and in all the specimens collected the smaller cheliped is missing. The larger of the two type specimens from Djibouti, an ova-bearing female, is 22,5 mm. long, while the largest specimen captured by the "Siboga", that from Stat. 311, is 15,5 mm. long. It is from this specimen that the following description is taken. Width of the orbital region two-thirds that of the anterior margin of the carapace. Rostrum short, obtuse, hardly reaching beyond the middle of the visible part of ist antennular article, twice as broad at its base as it is long. Anterior margin of the orbital hoods rounded, unarmed. Interorbital carina obtuse, separated by moderately broad and shallow grooves from the orbits, beyond the base of which it does not extend. Abdominal pleura rounded inferiorly. Greatest width of the telson slightly more than half its length, distance between the postero-lateral angles' just half as broad as the greatest width. The two pairs of spinules on the upper surface are very small, the anterior pair one and a half as far distant from the base of the telson as from its posterior margin ; sub- terminal spines also very small. Second antennular article almost as thick as longr and one and a half as lone as the visible part of the first ; 3rd article as long as the 2nd. Stylocerite rounded, as longf as ist article. Basicerite unarmed, carpocerite stout, co nsider ably long er than the antennular peduncle, extending beyond the tip by somewhat more than the length of 3rd article; scaphocerite 2,5-times as long as broad, narrowing anteriorly, the terminal spine extends by one-fourth of its length beyond the blade and the outer margin is straight. The scaphocerite, much shorter than the carpocerite, is but little longer than the antennular peduncle, the blade reaching to the end of the peduncle. In the adult type specimen from Djibouti the 2nd antennular article appears almost one and a half as long as thick, whereas the 3rd article appears decidedly somewhat shorter. In the specimen from Stat. 311 the terminal joint of the external maxillipeds bears several strong setae at the truncate extremity. Merus of the large cheliped half as broad as long, infero-internal margin somewhat uneven, unarmed at the apex like also the upper margin, 256 3§9 infero-external margin entire, not serrulate. (In two younger type specimens the infero-internal margin carries 3 small spinelets). Larger chela twice as long as broad, in adult type specimens two and a half times; the chela agrees with Fig. 279 of Coutière's work of 1899, but the lower margin runs distally a little upward and is not concave at the base of the immobile finger. In the right leg of the 2nd pair the carpal segments are i mm., 0,6 mm., 0,32 mm., 0,34 mm. and 0,54 mm, long, while the second segment is little more than twice as long as thick; chela 1,08 mm. long (palm 0,56111111., fingers 0,52 mm.). The left leg agrees with the right except the fifth segment of the carpus that is as long as the second. (In one of the adult type specimens from Djibouti the carpal segments are 1,3 mm., 0,8 mm., 0,32 mm., 0,34 mm. and 0,68 mm. long, the second segment 0,35 mm. thick; chela 1,28 mm. long (palm 0,55 mm., fingers 0,73 mm.)). These numbers show that the carpus lias a stout form, that the second segment is little more than half as long as the first, that the fifth is usually a little shorter than the second and that the fingers are in the adult distinctly longer than the palm, in younger specimens slightly shorter than it, whereas the chela is as long as the first segment. Ischium of the three following legs armed with a small movable spine. Merus of 3rd pair little more than 3-times as long as broad, unarmed; carpus 2,5-times as long as thick; propodus one-third longer than the carpus, little more than 3-times as long as broad, straight, slightly narrowing distally, with the posterior margin bearing 4 spines besides 2 at the distal extremity; dactylus half as long as the propodus, simple. Remarks. Alphcus socialis Heller differs i° by the triangular, otherwise shaped rostrum, 20 by the orbits that are armed with a spine, 30 by the second antennular article being twice as long as the first, 40 by the spine on the basicerite being long, 50 by the upper border of the larger chela being entire, 6° by the dactyli of the posterior legs presenting an accessory claw, etc. General distribution: Djibouti (Coütière) ; Mascate (Coutière). f 40. A/phcus pubescens de Man. J. G. DE Man, in: Notes from the Leyden Museum, Vol. XXX, 1898, p. 109. Stat. 43. April 4/5. Anchorage off Pulu Sarassa, Postillon-islands. Depth up to 30 m. Coral. 1 young specimen. Stat. 60. April 27/28. Haingsisi, Samau-island. Timor. Lithothamnion in 3 m. and less. 1 male of medium size and 1 younger specimen. Stat. 71. May 10 — June 7. Makassar. Depth up to 32 m. Mud, sand with mud, coral. 1 egg- bearing female. Stat. jj. June 10. 30 27' S., ii7°36'E. Borneo-bank. 59 m. Fine, grey coralsand. 1 female without eggs. Stat. 162. August 18. Between Loslos and Broken-islands, West coast of Salawatti. 18 m. Coarse and fine sand, with clay and shells. 1 adult, mutilated female. Stat. 273. December 23/26. Anchorage off Pulu Jedan, East coast of Aru-islands. (Pearl-banks). 13 m. Sand and shells. 1 adult male and 1 ova-bearing female. A new species of small size of the Brcvirostris group. The adult male from the Aru-islands is 20,5 mm. long, the egg-bearing female from Makassar 18 mm.: these two will be described as the types of this species. 257 SIBOGA-EXPED1TIE XXXIX ff'. 50 39° Rostrum acute, pointed, narrow, reaching to the middle or just beyond the middle of the visible part of ist antennular article, separated by a concave emargination from the rounded, unarmed, anterior border of the orbits. Width of the orbital region two-thirds that of the anterior margin of the carapace. Rostral carina continued to the middle of the carapace, interorbital part slightly concave, concealed in a lateral view by the orbits and presenting a prominence just behind the base of the orbital hoods, which prominence is, however, so small that it may easily be overlooked ; it is twice as far distant from the posterior margin of the carapace as from the tip of the rostrum, the extremity of which is curved downward. In the male from Stat. 273 the rostral carina appears rather obtuse, in the adult females somewhat sharper; in the young female from Stat. 77 it is rather obtuse posteriorly to the corneae and the small prominence is inconspicuous. The interorbital part is separated from the orbits by narrow, moderately deep grooves. This species is easily recognizable by the fine pubescence of the carapace, which is rather thickly covered with short hairs, 0,06 — 0,1 mm. long; orbital hoods nearly glabrous. Abdomen smooth and glabrous, pleura rounded below. Telson of the male not yet twice as l°n& (3 mm0 as broad anteriorly (1,64 mm.), distance (1,08 mm.) between the postero-lateral angles two-thirds the greatest width ; spinules of the upper surface large, anterior pair a little farther distant from the posterior margin than from the base, upper surface faintly furrowed longitudinally on its anterior half. Second article of the pubescent antennular peduncle in the male half as thick as long, little — in the adult one-sixth, in younger specimens one-fourth or one-third — longer than the visible part of the first, third article three-fifths of the second ; in the egg-bearing female from Makassar the width of the second article is little more than one-third of its length and this article is one-fourth longer than the visible part of the first. Stylocerite terminating in a spine that reaches to the end of first article. Spine of the basicerite small, shorter than the stylocerite. Carpocerite as long as the scaphocerite, extending beyond the antennular peduncle by two-thirds of the 3rd article. The scaphocerite, the greatest width of which is one-third of its length, is fringed with long setae and gradually narrows distally; the outer margin is concave and the terminal spine, almost half as long as the scaphocerite, exceeds the tip of the blade by one-fifth of its length, the point being curved inward. External maxillipeds reaching as far forward as the antennal peduncles, penultimate joint one and a half as long as thick, terminal joint twice as long as the penultimate and 4-times as long as broad, in a lateral view; the truncate extremity bears a tuft of setae, that are twice as long as the joint itself. Merus both of the larger and of the smaller cheliped of the male 2,5-times as long as broad, upper margin unarmed at apex, infero-internal margin armed with 4 or 5, short, movable, spinules and, at the far end, with an acute tooth. Carpus with a small, acute tooth at the infero-internal angle. Large chela one-third longer than the carapace, resembling that of A. Mier si, high, the proportion between length and height being 2,4; fingers little shorter than the palm, the latter 1,3-times as long as the former. The upper border of the palm which 258 39i is much compressed, its thickness being in proportion to its height as 2:5, bears a trans- verse groove just behind the articulation of the dactylus and appears, posteriorly to this groove, fiattened ; the outer margin ot the upper border is marked with a ridge, the inner is fringed with hairs. The somewhat pubescent, outer surface of the palm is fiattened, that of the immobile finger slightly concave and the outer margin of the lower border, which appears concave at the base of the immobile finger, is rather sharp. Inner face of the palm, especially of the immobile finger, finely granular. Merus of the large cheliped of the adult female less broad than that of the male, 3,5-times as long as broad, infero-external margin feebly serrulate, infero-internal with 5 short spinules and, at the apex, with a sharp tooth, like in the male; chela as long as the carapace, comparatively less high than in the male, the proportion between length and height being 3,3; fingers shorter than in the male, the palm 1,5-times as long as the fingers. There is a transverse groove on the upper border, which is less distinctly fiattened. Small chela of the male hardly longer than the carapace, much resembling that of A. djeddensis Cout. (Coutière, Les " Alpheidae", Paris, 1899, p. 233, fig. 285)-, the fingers that are Ba/aenüe/>s-shape.d, agree with those of this species, but they are slightly longer than the palm, the upper border of which is fiattened, with a transverse groove near the dactylus and with the outer margin ridged ; this chela is 3,45-times as long as high. Merus of the small cheliped of the female similar to that of the larger, but 4-times as long as broad. Chela a little shorter than the carapace, 5,6-times as long as high, presenting its greatest height at the articulation of the fingers ; fingers o n e and a h a 1 f a s long as the palm, slender, shutting together, their tips crossing one another ; upper border of the palm which is slightly higher than thick, without a transverse groove. In the adult male the carpal segments of the 2nd legs are 1,35 mm., 1,95 mm., 0,8 mm., 0,75 mm. and 0,8 mm. long, the second segment 8-times as long as thick; chela 1,141:1111. long (palm 0,56 mm., fingers 0,58 mm.). In the somewhat younger male from Stat. 60 these segments are 0,9111111., 1,75111111., 0,84 mm., 0,8 mm. and 0,7 mm. long, the second segment 9-times as long as thick; chela 1 mm. long (palm 0,46 mm., fingers 0,54 mm.). In the egg-bearing female from Makassar the carpal segments are 1,4 mm., 1,44111111., 0,6 mm., 0,6 mm. and 0,6 mm. long, the second 7-times as long as thick;- chela 1,04 mm. long (palm 0,44 mm., fingers 0,6 mm.). In the female from Stat. 77, finally, the segments of the carpus are: 1 mm., 1,54 mm., 0,7 mm., 0,66 mm. and 0,68 mm. long, the second segment 7, 7-times as long as thick; chela 1,05111111. long (palm 0,45111111., fingers 0,6 mm.). These numbers prove that the second segment of the slender carpus appears in the male and in the young female one and a half to twice as long as the first, while both segments are nearly of equal length in the adult female (in the egg-bearing female from Stat. 162 the second segment is also but Yu longer than the first), and that the three, slender, last joints are of equal length. Ischium of 3rd ancl 4th legs with a movable spine. Merus of the 3rd legs, in the adult male, slender, 5-times as long as broad, unarmed. Carpus half as long as the merus, propodus 1,3-times as long as the carpus, straight, slightly narrowing towards the distal extremity, 5-times as long as broad near the carpal articulation ; posterior margin of the propodus with 5 pairs of spinules, both margins beset with long setae, like the anterior border of the carpus. Dactylus 259 392 half as long as the propodus, one-third the length of the merus, not broader than thick, slightly curved, not flattened, simple. Remarks. Alpheus djcddcnsis Cout. from the Red Sea is a closely related form, in which the carapace is also pubescent. It is a species of much larger size, of which I have treated in: Mémoires Soc. Zoolog. France, 1909, p. 160 — 163, PI. VIII, figs. 25, 26. f41. Alpheus savuensis de Man. J. G. DE Man, in: Notes from the Leyden Museum, Vol. XXX, 1908, p. 110. Stat. ij. March 30/31. Sailus ketjil, Paternoster-islands. Depth 27 m. and less. Coral and coralsand. 1 egg-bearing female. Stat. 58. April 25. Anchorage off Sebu, Savu. Reef. 1 male. Another new species of small size of the Brevirostris group, closely related to A. pu- bescens de Man. Male 18,5 mm. long, the female 17 mm. Carapace al most quite glabrous. Rostrum acute, in the male just as long as broad at its base, in the female a little longer than broad, extending in the male to the middle, in the female just beyond the middle of the visible part of ist antennular article, projecting with four-fifths of its length beyond the rounded, anterior margin of the slightly prominent, unarmed, orbital hoods ; width of the orbital region two- thirds that of the anterior margin of the carapace. The rostral carina, which in the male is continued, though inconspicuously, for a short distance beyond the base of the orbital hoods, in the female not, appears rat her sharp between the orbits, from which it is separated by deep and broad grooves; the interorbital part of the carina is concealed, in a lateral view, by the orbital hoods and appears nearly straight, while the rostrum projects straightly fonvard. Second antennular article in the male twice, in the female a little more than twice as lone as thick (proportion in the female 2,25), a little — in the male one-fourth or one-fifth, in the female one-third — longer than the visible part of first article, third article a little shorter than that visible part. Acute point of stylocerite curved inward, not s p i n i f o r m as is the case in most other species of this group and extending to the distal sixth of the visible part of first article. Spine on the basicerite small, shorter than the stylocerite. Carpocerite projecting for a short distance — one-third of the 3ld article - - beyond the antennular peduncle ; scaphocerite as long as the carpocerite, not longer, resembling that of A. puöesceus, its greatest width two- fifths of its length, outer margin concave, terminal spine and blade also as in that species. External maxillipeds reaching as far forward as the antennular peduncle-, penultimate joint almost as thick as long; terminal joint 2,5-times as long as the penultimate and, in a lateral view, 3,5-times as long as broad, terminal setae twice as long as this joint. Merus of the large cheliped of the male (in the female both legs of the ist pair are missing) 2,5-times as long as broad, upper margin unarmed at the apex, infero-external feebly serrulate, infero-internal with a small, acute tooth at the far end, preceded by one or more short spinules (the margin presents a few obtuse prominences, one of which is tipped with a very small spinule, on the other ones the spinule is apparently lost). A small acute tooth at the infero-internal angle of the carpus. Chela similar to that of A. puóesceus, high, 2,55-times as long as high 260 5 r* 1 jyj (or broad), palm one and a half as long as the fingers; palm compressed, upper border with a transverse groove near the dactylus, posterior to the groove the upper border is flattened until to the oval area, its outer margin, however, is not ridged; outer face of the palm smooth, glabrous, slightly concave on the immobile finger, inner face finely granular, like the lower border, the outer margin of which is rounded. Upper and lower border of the chela fringed with hair at the inner side, fingers smooth, except the inner face of the immobile finger, which is finely granular. Merus of the small cheliped of the male 2,3-times as long as broad, of a stouter form than that of A. pnöescens, for the rest agreeing with the merus of the large cheliped. Chela 5,3 mm. long, much short er than the carapace (6,5 mm.), of a stouter shape than that of A. pubescens: the chela, indeed, is only 3-times as long as high and the fingers are a little long er than the palm; palm distinctly compressed, flattened above, without a trans- verse groove near the dactylus, inner face flattened, finely granular, fringed with hairs at the upper and at the lower margin, outer face also somewhat granular. Fingers Ba?ae7iiceps-shaped, as in A. djcddcnsis Cout. and A. pubescens\ dactylus ridged above and fringed with hair at the inner side of this ridge, nearly as in these species. Carpal segments of second legs in the male: 1 mm., 1,5 mm., 0,6 mm., 0,6 mm. and 0,62 mm. long, chela 0,9 mm. long (palm 0,4 mm., fingers 0,5 mm.); in the female these segments measure 0,9 mm., 1,25 mm., 0,54 mm., 0,5 mm. and 0,58 mm., chela 0,85 mm. (palm 0,42 mm., fingers 0,43 mm.), and, both in the male and in the female, the second carpal segment is 7-times as long as thick. These numbers prove that the carpus much resembles that of A. pubescens, the second segment being 7-times as long as thick, in the male one and a half, in the female almost one and a half as long as the first, while the three last segments are of subequal length. Ischium of the three posterior legs with a movable spine. Merus of 3rd legs of a stouter shape than that of A. pubescens, being only four times as long as broad, unarmed; carpus unarmed, a little more than half as long as the merus, propodus 1,2-times as long as the carpus, straight, slightly narrowing towards the distal extremity, 4-times as long as broad near the carpal articulation ; posterior margin with 5 pairs of spinules, both margins with long setae, like the anterior border of the carpus. Dactylus half as long as the propodus, one-third the length of the merus, slightly curved, styliform like that of A. pubescens, not broader than thick, not flattened, simple. Ova not very numerous, 0,65 mm. long, 0,5 mm. thick. 42. Alpheus Miersi Cout. Alplieus rapax var. Miersi H. Coutière, in: Buil. Soc. Entom. France, 1898, p. 166. Alpheus Miersi H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 903, PI. LXXXIII, PI. LXXXIV, fig. 42. Alpheus miersi J. Pearson, On the Macrura, in: Report Pearl Oyster Fisheries Ceylon, 1905, p. 85. Stat. 37. March 30/31. Sailus ketjil, Paternoster-islands. 27 m. and less. Coral and coralsand. 1 adult egg-bearing female and 1 young specimen. Stat. 66. May j S. Bank between islands of Bahuluwang and Tambolungan, South of Saleyer. 8 m. Dead coral, Halimeda, Lithothamnion. 1 young specimen, probably a male. 261 1 -o 394 Stat. 99. June 28/29/30. 6°j'.$ N., 120° 26' E. Anchorage off North-Ubian. 16 — 23 m. Litho- thamnion. 4 females, the largest of which is egg-bearing, all taken on the surface. Stat. 240. November 22 till December 1. Banda-anchorage. Black sand, coral, Lithothamnion- bank in 18 — 36 m. 1 young female. The largest of the specimens is the adult female from Stat. 37, which is 21 mm. long. The stylocerite reaches to the end, the rostrum almost to the end of first antennular article. The fingers of the large chela appear a little shorter than in Coutière's figure 42 f, the palm being almost twice as long as the fingers. There is a small acute tooth at the far end of the infero-internal margin of the merus of the small cheliped, this tooth is much smaller than the corresponding tooth on the merus of the larger leg ; in both chelipeds the infero-internal margin Tears 3 small spinules on its proximal half. The carpal segments of the right leg of the second pair are 1,4 mm., 1,28 mm., 0,58111111., 0,6 mm. and 0,72111111. long; the chela is 1,25 mm. long (palm 0,54111111., fingers 0,71 mm.); the left leg is missing. In the right leg the first segment appears slightly longer than the second and the third and fourth are almost of the same length. Merus of third legs almost 5-times as long (2,9 mm.) as broad (0,66 mm.) with a rather small, acute tooth at the far end of the posterior margin; propodus but little longer than the carpus (proportion 1,18), about as in Coutière's figure 42^, while according to the description the propodus should be almost one and a half as long as the carpus (proportion 1,43). The egg-bearing female from Stat. 99 is only 15,5 mm. long. In this specimen the yd antennular article appears a little shorter than the visible part of the ist. Meri of chelipeds with 4 spinules besides the apical tooth on their infero-internal margin. In the right leg of the second pair the carpal segments are 1,12 mm., 1,12 mm., 0,5 mm., 0,56111111. and 0,74111111. long; the chela is 1,05 mm. long (palm 0,46111111., fingers 0,59 mm.). In this specimen the first segment appears just as long as the second, but in another from the same locality the second segment appears slightly longer than the first, the segments being 1 mm., 1,05111111., 0,5 mm., 0,52 mm. and 0,6 mm. long. In the third specimen long 9 mm. from Stat. 99 the carpal segments of the right leg measure 0,68 mm., 0,7 mm., 0,34 mm., 0,34111111. and 0,42111111.; the chela is 0,66 mm. long (palm 0,31 mm., fingers 0,35 mm.). In this specimen the propodus of the third legs, that carries 6 spines 011 the posterior margin, appears comparatively longer than in the preceding specimen, for it is almost 1,4-times as long as the carpus. In the specimen from Stat. 66, finally, the second segment of the carpus appears distinctly longer than the first, while the three following are equal. General distribution: Maldive and Laccadive Archipelagoes (Coutière); Ceylon (Coutière); Gulf of Manar, Cheval Paar, off Mutwal Island (Pearson); Mascate (Coutière); Port-Molle (Coutière); New Caledonia (Coutière); Japan (Coutière). f 43. Alpheus rapacida de Man. J. G. de Man, in: Notes from the Leyden Museum, Vol. XXX, 1908, p. 105. Stat. 133. July 25/27. Anchorage off Lirung, Salibabu-island. 36 m. Mud and hard sand. 1 young female. 262 395 Stat. 279. January 1 1 13. Rumah-Kuda-bay, Roma-island. 36 m. Mud and sand. 1 specimen, probably a male, and 1 egg-bearing female. Stat. 313. February 14/16. Anchorage East of Dangar Besar, Salch-bay. Depth up to 36 m. Sand, coral and mud. 2 specimens, one of which with eggs. Probably a new species, closely related to A. rapax de Haan = A. distinguendus de Man from Japan and to A. rapax Cout. 1905 from the Laccadive Archipelago. It belongs to those species of the Brevirostris group, in which the upper border of the large chela bears n o transverse groove near the articulation of the dactylus and in which the dactylus of the small cheliped of the male is not Ba/ae7iiceps-sha\-)ed, at least when the large specimen from Stat. 279 is really a male. This specimen, which is larger than the others, is 22,5 mm. long. This species differs from A. distinguendus by its mtich smaller size, unfortunately Coutièke does not mention the length of the male referred by him to A. rapax (Alpheidae Mald. and Laccad. Archip. 1905, p. 905). Rostrum acute, almost reaching to the middle of first antennular article, continued in a carina, which, rather acute between the orbital hoods and separated from them by narrow, deep grooves, becomes, posteriorly to the hoods, obtuse, gradually lower and more inconspicuous, though it can be foliowed almost to the middle of the carapace. Second antennular article little (about one-fourth) longer than the visible part of the first and 2,5-times as long as thick; third article about half as long as the second. Stylocerite foliaceous, ending in a small spinule that reaches to the end of first antennular article. Antennal peduncle as long as that of the upper antennae, basicerite with a small spinule on the lower margin, which spinule hardly reaches as far forward as the rostrum. The scaphocerite that extends beyond the antennular peduncle almost by the whole length of third article — in the egg-bearing female from Stat. 313 even by slightly more than this article — is 3-times as long as broad; the outer margin is very slightly concave and the terminal spine extends but for a short distance beyond the blade. Telson twice as long as broad anteriorly, while the width of the posterior margin is a little less than one-third of the length ; swimmerets a little longer than the telson. Of the external maxillipeds that reach as far forward as the antennal peduncle, the terminal joint has a slender form, being 5-times as long as broad; its margins are beset with long setae, those at the tip being one and a half as long as the joint itself; the penultimate joint is almost half as long as the terminal joint and one and a half as long as thick. The merus of the large cheliped of the male from Stat. 279 is 3,1-times as long as broad, the upper margin ends in a small spinule, as in Spence Bate's A. rapax (Report Challenger Macrura, PI. 99, fig. 1 k), while the infero-external margin is very finely serrulate along its whole length; the infero-internal margin bears 4 small, movable spinules and ends in a small, acute tooth. Chela similar to that of Bate's A. rapax, but its form appears more slender, because it is almost four times as long (7,8 mm.) as high (2,1 mm.); palm compressed, half as thick as high. The upper border of the palm which is almost twice as long (5 mm.) as the fingers, is somewhat flattened, the inner margin is fringed with hairs from the tip of the dactylus to the carpal articulation and there is n o transverse groove near the 263 396 articulation of the dactylus. Lower border rather sharp, especially that of the immobile finger and fringed also with long hairs at the inner side. Outer face of the palm without crests or ridges, fiattened or very slightly concave on the outer face of the immobile finger; palm finely granular, the granulation reaching to the middle of the fingers. Immobile finger a little longer than the dactylus. Only one female with eggs, long i8mm., namely that from Stat. 313, bears the large cheliped. Merus 3,4-times as long as broad, the two lower margins as in the male, the upper margin without a spinule at the far end. Chela comparatively smaller than in the male, 5,8 mm. long (palm 3,7 mm., fingers 2,1 mm.) and 1,55 mm. high, for the rest similar to it. Of the small cheliped of the male the merus is 3,5-times as long as broad; upper margin ending in a small spinule, infero-external margin finely serrulate, while the infero-internal bears 5 small, movable spinules and terminates in a small, acute tooth. The chela closely resembles that ot de Haan's A. rapax (J. G. de Man, in: Trans. Linn. Soc. London. Ser. 2, Vol. IX, PI. XXXIII, Fig. 52), it is but little shorter than the large chela, being 7 mm. long. The palm that measures one-third of the total length, appears one and a half as long as broad and nearly as much compressed as the other chela ; the upper border, fringed at the inner side with long hairs to the end of the dactylus, presents 110 transverse groove. Of the gaping and tapering fingers that are fringed with hairs on their prehensile edges, the immobile appears a little broader at its base than the dactylus. In the female the merus of smaller cheliped resembles that of the male, but the upper margin is unarmed; the chela differs only by the palm being slightly longer in proportion to the fingers; the palm, indeed, is 1,9 mm. long, the fingers 3,1 mm. Like in the male, the palm appears finely granular under a lens. The carpal segments of the second legs are, in the male from Stat. 279, 1,4 mm., 1,6 mm., 0,6 mm., 0,56 mm. and 0,76 mm. long; the chela is 1,4 mm. long (palm 0,6 mm., fingers 0,8 mm.). The second segment, 0,27 mm. thick in the middle, appears 6-times as long as thick. In the younger specimen from Stat. 313 the carpal segments are 1,25 mm., 1,5 mm., 0,5111111., 0,48111111. and 0,6 mm. long; the chela is 1,25 mm. long (palm 0,52 mm., fingers 0,73 mm.). In the young female, long 15111111., from Stat. 133 the carpal segments of the left leg are 0,92 mm., 0,88 mm., 0,35111111., 0,34111111. and 0,5111111. long, the chela 1,08 mm. long (palm 0,52 mm., fingers 0,56 mm.); in the right leg they are 0,88 mm., 0,84111111., 0,34 mm., 0,32 mm. and 0,48 mm. long, chela 1,03 mm. (palm 0,47 mm., fingers 0,56 mm.). The second segment appears but little — one-seventh to one-fifth — longer than the first, in young specimens even slightly shorter, but in the species referred by Coutière to A. rapax it is twice as long as the first. Ischium of third and fourth legs with a small, movable spine at the base. Merus of third legs unarmed, 5-times as long as broad. The propodus which is one and a half as long as the unarmed carpus, is slightly curve d and shows a rather slender form ; it presents its greatest width of 0,46 mm. not far from the carpal articulation, it is 6,5-times as long as broad and it narrows a little distally; there are 3 small, equal spines on the proximal half of the lower margin and one of the same length at the distal extremity, both margins are moreover 264 397 besct with rather long setae. Dactyli slightly arcuate, measuring two-thirds of the propodus; they are lanceolate, in the middle much broader than high. Fourth legs shorter than the 3rd, for the rest resembling them. Unless the contrary was remarked, the preceding description was taken from the male captured at Stat. 279. Alpheus rapacida differs from A. rapax de Haan by its much smaller size, by the second antennular article being little longer than the first, by the slender shape of the large chela and probably by other characters. f 44. Alpketis lepidus de Man. J. G. DE Man, in: Notes from the Leyden Museum, Vol. XXX, 1908, p. 106. Stat. 51. April 19. Madura-bay and other localities in the southern part of Molo-strait. 54 — 90 m. Fine grey sand ; coarse sand with shells arid stones. 1 egg-bearing female and 1 young specimen. Stat. 114. July 8. o°58'.5 N., I22°55'E. Kwandang-bay-entrance. 75 m. Hard sand, very fine. 4 specimens, one of which with eggs. A new species of small size of the Brevirostris group, closely allied to A. rapacida de Man. The largest specimen, one from Stat. 114, is 17 mm. long, the two egg-bearing females 14 mm. and 16 mm. The pointed, acute rostrum reaches a little beyond the middle of the visible part of first antennular article and is almost as broad at its base as it is long ; the rostrum, that projects straightly forward, is continued in a narrow, sharp and prominent carina, that extends back w ar d to behind the middle of the cara p ace. The interorbital part of this carina which is the most striking feature of this species, is concealed by the rounded orbital hoods in a lateral view of the carapace and is separated from them by narrow, moderately deep grooves. Orbital or frontal region rather narrow, little more than half as broad as the anterior margin of the carapace. Telson narrow, twice as long as broad anteriorly and 4-times as long as the posterior margin is broad. Second antennular article little (one-third) longer than the visible part of the first and twice as long as thick ; third article little more than half as long as the second. ' Stylocerite very broad, the terminal spine almost reaching to the end of ist antennular article. Carpocerite reaching beyond the antennular peduncle by one-third of the third article ; inferior spine of basicerite small, shorter than the rostrum, reaching to the middle of the visible part of ist antennular article. The scaphocerite, the outer margin of which is slightly concave and which just extends beyond the carpocerite, appears about 3-times as long as broad, the blade is rather narrow anteriorly and as long as the antennular peduncle, while the terminal spine extends by one-third of its length beyond the tip of the blade. Terminal joint of external maxillipeds slender, slightly narrowing distally, 4,5-times as long as broad at base; penultimate joint half as long and a little more than one and a half as long as thick. 265 SIBOGA-EXPEDIÏIE XXXIX a'. 51 398 Only one specimen, 13,5 mm. long, without eggs, from Stat. 114 bears the large cheliped. Merus 3-times as long as broad, upper margin unarmed at the apex, infero-external margin finely and widely serrulate, infero-internal armed with 4 movable spinelets and ending in a small, acute tooth. Chela slightly turned outward, 3-times as long as high and half as thick as high, distinctly compressed ; the palm, twice as long as the fïngers, appears finely granular under a lens, the granules are acute and a little larger on the inner than on the outer face. Upper border of the palm obtuse without a trans verse groove near the dactylus, fringed, like the lower border, with long hairs at the inner side, from the carpal articulation to the tip of the fingers. In the ova-bearing female the merus of the larger cheliped appears comparatively a little broader than that of the described specimen, which therefore is, no doubt, also a female. In all the specimens the small cheliped is missing. In an adult specimen from Stat. 114 the carpal segments of the second legs are 0,8 mm., 1,8 mm., 0,45 mm., 0,45 mm. and 0,56 mm. long; the chela is 1,25 mm. long (palm 0,5 mm., fingers 0,75111111.). The carpus appears more slender than in A. rapacida: whereas the second segment appears in this species 6-times as long as thick, it is in the adult specimen of A. lepidus, probably a male, io-times as long as thick, the second segment being 0,19 mm. thick in the middle. In the egg-bearing female from the same station, however, the carpal segments are 0,72111111., 1,4111111., 0,4 mm., 0,4111111. and 0,5 mm. long; the chela is 1,14 mm. long (palm 0,46 mm., fingers 0,68 mm.), but the second segment, also 0,19 mm. thick, appears in the female comparatively a little thicker than in the male. In the female the second segment is just twice as long as the first, in the male it appears a little longer and the chela is one and a half as long as the first segment. Merus of third legs unarmed, more slender than that of A. rapacida, being 6-times as long as broad ; propodus one-third longer than the unarmed carpus, resembling that of A. rapacida as regards its form, armed with 3 short spines on the proximal half of its concave, posterior margin and with a similar spine at the distal extremity. Dactylus two-thirds of the propodus, resembling that of A. rapacida. In the female the propodus is one and a half as long as the carpus and the dactylus measures three-fourths the length of the propodus. Merus of fourth legs measuring two-thirds that of the third. f45. Alphens Sibogac de Man. J. G. DE Man, in: Notes from the Leyden Museum, Vol. XXX, 1908, p. 107. Stat. 49:v. April 14. 8°23'.5S., U9°4'.6E. Sapeh-Strait. 70 m. Coral and shells. 1 male. Stat. 51. April 19. Madura-bay and other localities in the southern part of Molo-strait. 54 — 90 m. Fine grey sand ; coarse sand with shells and stones. 5 specimens, viz. 2 males, i egg-bearing female and 2 younger specimens. Stat. 305. February 8. Mid-channel in Solor-strait off Kampong Menanga. 113 m. Bottom stony. I egg-bearing female. An interesting new species of the Brcvirostris group of small s i z e , the male being 12,5 mm. long, the egg-bearing female 13,5 mm. 266 399 Rostrum acute, narrow, 2 to 2,5-times as long as it is broad at base, reaching to the distal third of the visible part of first antennular article and projecting straightly forward, though the extremity is a little turned downward. Rostral carina sharp, continued to just behind the middle of the ca rap ace and bearing, somewhat posterior to the orbital hoods, a small, obtuse tubercle or prominence, situated nearly twice as far from the posterior margin of the carapace as from the tip of the rostrum ; interorbital part of the rostral carina slightly concave and concealed, in a lateral view, by the orbital hoods. Orbital region broad, two-thirds the width of the carapace anteriorly ; corneae large, one and a half as long as the rostrum, orbits rounded anteriorly, unarmed, anterior margin of the orbital region very slightly concave. Grooves between the orbits and the rostral carina very narrow, moderately deep. Carapace smooth. Abdominal terga coarsely punctate, lower angle of abdominal pleura subacute, especially those of the 3ld and the 4lh somites. Telson narrow, twice as long as broad anteriorlv, whereas the distance between the postero-lateral angles is little more than one-fourth the length; spinules of the upper surface inserted about twice as far from the mid-line as from the lateral margins. Second antennular article slender, about four times as long as thick, one-third longer than the visible part of the first, that is one and a half as long as the third; stylocerite reaching almost to the end of first article. Basicerite with a small spine, shorter than the stylocerite. Carpocerite as long as the antennular peduncle, scaphocerite in the male a little longer than the antennular peduncle, but in the female as long as it, narrow, its greatest width not yet one-fourth of its length. The blade, that narrows anteriorly, hardly reaches beyond the middle of the terminal spine, that measures one-third of the total length of the scaphocerite ; outer margin of the latter decidedly concave. In the male the blade reaches to the end of the antennular peduncle, in the female it extends just beyond the end of the second article. Outer margin of the antepenultimate joint of the external maxillipeds unarmed, lower face with a prominent undulate crest that runs from the proximal to the distal extremity ; penultimate joint conical, hardly longer than thick ; terminal joint narrowing, five times as long as broad at base, three times as long as the penultimate joint. Infero-internal margin of the ischium of the larger cheliped of the male coarsely denticulate or tuberculate. Merus 3-times as long as broad, upper margin coarsely denticulate or tuberculate along its whole length, unarmed at apex; infero-external margin finely denticulate, outer face covered with subacute granules that are larger on the upper half, infero-internal margin armed with 4 acicular spinelets and terminating in an acute tooth. Carpus armed at the infero-internal angle with a sharp tooth. Chela turned outward, a little more than one and a half as long as the carapace, 3-times as long as high, compressed, about half as thick as high ; upper border of the palm, which is almost 3-times as long as the fingers, rounded, without a transverse groove near the articulation of the latter. Besides by its rostral carina, A.Sibogae is furthermore characterized by a moderately deep groove on the outer face of the palm. This groove that begins near the lower end of the carpus, where it is rather narrow, gradually widens until to the middle of the palm and from here, slightly narrowing again, extends almost to the tip of the immobile finger; this 267 4-00 groove, which, on the middle of the palm, occupies the greatest part of the outer surface, is bounded inferiorly by a ridge that runs parallel with the rounded, lower border of the palm and that is most conspicuous in the middle. Proximally this groove is limited above by an inconspicuous ridge, defining the oval area, but not reaching bevond it. Both the upper and the lower border of the palm are fringed at the inner side with hairs, like in other species. Examined under a lens, the palm appears finely granular, but the groove is nearly smooth, like also the fingers. Merus of the larger cheliped of the female 4-times as long as broad, for the rest as in the male, but the denticles of the infero-external margin and the subacute tubercles on the upper half of the outer surface and on the upper margin are somewhat larger. Carpus and chela as in the male, but the chela somewhat shorter, little longer than the carapace. Merus of the small cheliped of the male 3,5-times as long as broad, for the rest resembling that of the large, but the granules and tubercles are smaller. Chela slightly shorter than the other (proportion between the length of the chelae 1,13), palm slightly compressed, 3-times as long as high and hardly longer than the fingers ; upper border of the palm without a transverse groove near the dactylus, outer face also with a shallow groove reaching on its lower half from the carpal articulation to that of the fingers and defined inferiorly by a little prominent ridge. The long, pointed extremities of the fingers are crossing one another, the dactylus is Ba/ae7iicc/>s-sh3.ped, its upper surface resembles a spoon, when looked at from above, the distal half being elliptical, the proximal half constricted. Palm and proximal half of the fingers finely granular under a magnifying-glass. Of the small cheliped of the female the merus is 5-times as long as broad, for the rest it agrees with that of the male, but the denticles on the infero-external margin and the subacute granules and tubercles on and near the upper border are larger. Chela a little shorter than the small chela of the male (proportion 1,25); the palm which is slightly shorter than the fingers and nearly 3-times as long as high, resembles that of the small chela of the male, but the groove on the outer face is inconspicuous; fingers slender, tapering and shutting together. Carpal segments of the second legs of the male 0,92 mm., 1,14 mm., 0,45 mm., 0,5 mm. and 0,46 mm. long, the second segment 10-times as long as thick in the middle; chela 0,7 mm. long (palm 0,28 mm., fingers 0,42 mm.). In the adult female the carpal segments are 0,96 mm., 1,16 mm., 0,48 mm., 0,58 mm. and 0,52 mm. long, the second segment 9-times as long as thick; chela 0,83 mm. long (palm 0,35 mm., fingers 0,48 mm.). These numbers indicate that the carpus is slender, that the 2nd segment is one-fourth or one-fifth longer than the ist, that the 4th is slightly longer than the subequal 3rd and 5th and that the chela, the fino-ers of which are in the male one and a half, in the female one and one-third longer than the palm, is a little shorter than the ist segment of the carpus. Ischium of 3'd and 4lh legs unarmed. Merus of 3rd legs unarmed, slender, 8 — 9-times as long as broad in the middle ; carpus also slender, propodus one-fourth longer than the carpus, straight, not narrowing distall)', its posterior margin with 7 or 8 spines; dactylus slightly curved, not broader than high, pointed, half as long as the carpus and two-fifths of the propodus. 268 401 T j\.6. Alpheus acutocarinatus de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 104. Stat. 2. March 8. 7°25'S., II3°i6'E. Madura-strait. 56 m. Grey mud with some radiolariae. 1 male, without the larger cheliped. Stat. 19. March 19/21. 8°44'.5S., u6°2'.5E. Bay of Labuan Tring, West coast of Lombok. 18 — 27 m. River-mud, coral, coralsand. 1 adult specimen, without small cheliped, probably a male, and a somewhat younger ova-bearing female, which has lost the larger cheliped. Stat. 116. July 12. o°58'.5 N., I22°42'.5 E. West of Kwandang-bay-entrance. 72 m. Fine sand with mud. 1 adult, ova-bearing female. Stat. 311. February 12 13. Sapeh-bay, East coast of Sumbawa. Depth up to 36 m. Mud and sand. 1 mutilated, young female. A new species of the Brevirostris group, related to A. macrosceles Alc. & Anders, from the Bay of Bengal. The largest specimen, probably a male, is that from Stat. 19, which is 28 mm. long, the carapace, rostrum included, being just half as long as the abdomen. Integument smooth and polished. Orbital region prominent, its width two-thirds that of the anterior margin of the carapace. Rostrum acute, narrow, little longer than broad at base, projecting straightly fonvard and reaching in most specimens to the middle of the visible part of ist antennular article, in the female from Kwandang-bay, however, to the distal third. The rostrum is continued in a prominent and sharp carina, that re ach es almost to the posterior third of the carapace and that bears, immediately behind the base of the orbital hoods, a small, obtuse tubercle or tooth; this tooth is twice as far distant from the posterior margin of the carapace as from the tip of the rostrum. That part of the rostral carina, which is situated before the median tubercle, runs S-like, the interorbital portion, that in a lateral view is concealed by the orbits, being concave ; the rostral carina is separated from the prominent, rounded and unarmed, orbital hoods by deep, though narrow grooves and, at either side of the rostrum, the frontal margin makes an obtuse angle with the anterior margin of the orbits. One observes, in the mid-dorsal line of the carapace, quite posteriorly, a small, acute tubercle, little farther distant from the raised line that runs parallel with the posterior margin than the latter from that line. In the female from Kwandang-bay the rostruni appears a little less broad at its base than in the other specimens. The pigment of the large eyes is well-developed. According to the figure 5 of Plate IX of the "Illustrations of the Zoology of the Investigator, Crustacea", the 2nd — 4"1 abdominal pleura should be subacute in A. macrosceles \ in A. acuto- carinatus, however, they are regularly rounded. The telson, about half as long as the carapace, is twice as long as its greatest width anteriorly and tapers rather strongly, so that its form is elongate; it suddenly narrows just in front of the middle, so that the distance between the postero-lateral angles is only half as broad as the greatest width ; posterior margin very prominent and strongly a reu at e. The upper surface is flattened, but beyond the spinules it slopes down towards the lateral margins-, of the two pairs of spinules, that are small, 0,24 — 0,28 mm. long, the anterior pair is situated just in front of the middle, 269 4-02 the posterior pair a little farther distant from the anterior pair than from the posterior margin or just as far distant. In the adult specimen from Stat. 19 the lateral spinules are missing, but in the other, younger specimen the longer inner spinules reach almost to the end of the telson. The tvvo spines of the basal joint of the uropods are very small, especially the outer, which sometimes even is wanting entirely; the uropods are little longer than the telson. Second antennular article slender, 5-times as long as thick in the middle, almost twice as long as the visible part of the ist; in the young female from Sapeh-bay, long iS mm., it appears but little longer than the ist. Stylocerite a little shorter than basal article, terminating in a slender spine, that is turned outward. Spine on the basicerite small. Carpocerite hardly reaching to the end of second antennular article. Scaphocerite slender, a little shorter than the antennular peduncle, ter- minal spine as in A . macrosceles, hardly reaching beyond the obtuse tip of the blade, stout, its width at base being one-third its length (Confer: H. Coutière, Buil. Soc. Entom. France, 1898, p. 32, fig. 3'); outer margin of the scaphocerite very slightly concave. External maxillipeds slender, as long as the antennular peduncle; penultimate joint appearing, in a lateral view, 3-times as long as thick distally, terminal joint one and a half as long as the penultimate, tapering, seven times as long as broad at its base and with obtuse extremity. Thoracic legs as slender as those of A. macrosceles and A. Talismaui. In the adult male from Stat. 19 the large cheliped, 24,5 mm. long, appears a little shorter than the body. The merus, 6,8 mm. long, reaches as far forward as the antennular peduncle and its form is slender, for it appears six times as long as broad in a lateral view; the upper maro-in is unarmed, without a spine near the far end, the infero-internal margin carries a few finely- aciculiform spinelets and a somewhat larger one at the distal extremity, the longitudinal ridoe on the lower face and the infero-external margin are beset with small, acute granules, that exist also here and there on the outer face like also on the ischium. Carpus short, nearly one and a half as long as thick. Chela, 12,9111111. long, almost one and a half as lono- as the carapace and almost twice as long as the merus, slender, six times as lono- as broad (high), the greatest breadth situated at the proximal fourth; the palm, that measures nearly two-thirds the length of the chela, viz. 8,3 mm., is slightly compressed, about in the proportion of 4 : 3 and it decidedly tapers towards the articulation of the fingers. Both the upper and the lower border of the palm are obtuse, fringed, like in other species, with hairs at the inner side and they are entire; the slightly convex, outer and inner surfaces show no carinae, rido-es or depressions at all, but they are finely granulate, especially the inner. Fingers measurino- little more than one-third the length of the chela and three-fifths that of the palm, slender, compressed and smooth; dactylus carinate above, obtusely pointed and a little shorter than the immobile finger, the tip of which is more acute; the dactylus bears in the middle an elongate, concave prominence that fits into a hole of the other fïno-er. The large cheliped of the female resembles that of the male, but is shorter, the chela being hardly longer than the carapace. 270 403 Chela of the small cheliped of the male from the Madura-Strait 9 mm. long, nearly one and a half as long as the carapace (9,5 mm.); the palm being 1,06 mm. broad (high) in the middle, the chela appears 9-times as long as broad. The palm that slightly broadens towards the articulation of the fingers, is little longer than the latter, the fingers being 4,3 mm. long, the palm 4,7 mm.; the fingers are more slender than those of the large chela, shut together and the dactylus is Balaemcefls-sha.ped ; the fingers, the pointed apices of which are crossing one another, are of equal length. As regards the granulation and as regards the borders that are entire and fringed with hairs at the inner side, the palm agrees with that of the laro;e chela. The small chela of the female resembles that of the male, but the fingers are more slender, shut together and are slightly longer than the palm, while the dactylus is simple, n o t Ba/aeuice/>s-sha.ped. With regard to the length of the carapace this chela agrees with that of the male. In the female from Kwandang-bay the fingers of the small chela are a little longer than in that from Stat. 19. The second segment, 8 — 10-times as long as thick, of the slender carpus of the 2nd legs, is usually but little longer than the first, but in the female from Stat. 19 almost one and a half as long ; the three following segments are of s u b e q u a 1 length, usually, however, the 4th slightly longer than the two others, but in the female from Kwandang-bay the 4th segment is a little shorter than the 3rd and slightly longer than the 5"1; the chela measures two-thirds of the length of the 2nd segment and the fingers are slightly longer than the palm. Ischium of 3ld and 4th legs with a very small spine at base. Merus of these legs unarmed, those of the 3rd pair slender, 10-times as long as broad; carpus little more than half as long as the merus, the tapering propodus slender, measuring two-thirds of the merus ; the dactylus, finally, measures little more than one-third of the propodus, is lanceolate, depressed, pointed and appears in the middle much broader than thick. In the legs of the 5th pair, the carpus is just as long as the merus, while the propodus is a little shorter; dactylus one-third of the carpus, a little more than one-third of the propodus. Adult male 28 mm. long, the ova-bearing female 23 or 25 mm. 47. Alphcus ??iacrosceles Alc. & Anders. Alpheus macrosceles A. Alcock and A. R. Anderson, in: Journal Asiat. Soc. Bengal, Vol. LXIII, Part II, 1894, p. 153. Alpheus macrosceles A. Alcock, Indian Deep-sea Crustacea, Decapoda Macrura and Anomala, Calcutta, 1901, p. 140. Illustrations of the Zoology of the Investigator, Crustacea, PI. IX, Fig. 5, Calcutta, 1895. Confer H. COUTIÈRE, in: Buil. Soc. Entom. France, Paris, 1898, N° 3. Stat. 5. March 10. 7° 46' S., ri4°30'.5 E. Bali Sea. 330 m. Mud. 1 egg-bearing female. It is with some doubt that this specimen is referred to A. macrosceles, not only because the legs of the ist pair are missing, but also because it shows some slight differences from the quoted descriptions. The pointed rostrum that is one-third longer than broad at its base, reaches a little 271 404 bevond the middle of the visible part of first antennular article and is slightly turned upward ; it is continued into the obtuse rostral carina, which in a lateral view is not quite concealed by the orbital hoods, from which it is separated by narrow grooves ; the rostral carina gradually broadens backward and passes at the base of the orbital hoods into the surface of the carapace. According to Alcock and Anderson (1. c. 1894) the eyes should be markedly deficiënt in pigment; in this specimen, however, the black pigment is quite plentiful, reaching almost to the base of the orbital hoods and, at either side of the orbital region, specks of the same pigment occur, just outside the eyes. In the male of this species the abdominal pleura are of moderate width and subacute, according to the figure in the "lllustrations", but in the female taken by the "Siboga" they are rounded inferiorly and as well developed as in other species. Telson elongate, 4,5-times as long as the posterior margin is broad, width at the base almost twice that of the posterior margin, the proportion being as 1 5 : S ; spinules of the upper surface 0,28 — 0,3 mm. long, anterior pair situated just on the middle, at some distance from the lateral margins, posterior pair almost one and a half as far distant from the posterior margin as from the anterior pair, the proportion between these distances being 11:8; posterior margin rounded, rather prominent, the inner longer spines are rather short, though just reaching beyond the posterior margin, the outer are half as long; upper surface of the telson flattened, not grooved. Second antennular article four times as long as thick, one and a half as long as the visible part of the first, 3rd article two-thirds of the latter; stylocerite ending in a slender spine, that, just reaching beyond the ist article, is turned out war cl and upward. In the type specimen figured by Coutière (1. c.) the stylocerite is directed straightly forward. Basicerite with well-developed spine, 0,34 mm. long. Carpocerite slender, extending beyond the antennular peduncle almost by the length of 3rd article; in the figure 3' of Coutière's quoted paper the carpocerite is not visible, I wish, however, to remark that in the figure 5 of the "lllustrations" the carpocerite appears decidedly longer than the antennular peduncle. Like in the typical specimen figured by Professor Coutière, the blade of the scaphocerite, the outer margin of which is nearly straight, reaches as far forward as the antennular peduncle, but differently from his figure 3', the terminal spine, that extends as far forward as the carpocerite, projects with half its length beyond the tip of the blade, in the quoted figure, however, it hardly extends beyond it; the blade is fringed with long hairs. Terminal joint of external maxillipeds slender, 7-times as long as broad at its base, narrowing towards the clistal extremity and 3-times as long as the preceding joint. The left leg of the second pair (the right is missing) extends almost with four segments of the carpus beyond the tip of the carpocerite. Merus very slender, 10 — 11 -times as long as broad in the middle ; it bears near the proximal end of the posterior margin a small tooth, that seems to fit into a small hole at the distal extremity of the preceding joint. Carpal segments 2, 16 mm., 1,06 mm., 0,46 mm., 0,55 mm. and 0,7 mm. long, chela 1,35 mm. long (palm 0,5511:111., fingers 0,8 mm.); the second segment, half as long as the first and one and a half as long as the fifth, is 5-times as long as thick, the carpus appearing rather slender. 272 4°5 The following legs are also very slender, their meri unarmed ; the meri of the 3rd legs are 8,8-times as long as broad, smooth and glabrous. Ischium of 3rd and 4th legs with movable spine. Etrsfs small and numerous. General dist.ribution: Bay of Bengal (Alcock, Anderson); Andaman Sea (Alcock, Anderson). V. Ediuardsii group. 748. Alpheus bis-incisus de Haan. Alpheus bis-incisus W. de Haan, Fauna Japonica, Crustacea, 1849, p. 179, Tab. XLV, fig. 3. Alpheus bis-incisus H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 910, 911. May 16. 1909. North-coast of Sumatra, to the east of Segli. 40 — 70 fathoms. 1 male and 1 ova-bearing female collected by Mr. VAN NOUHUIJS. Unfortunately the female has lost both legs of the ist pair, while the male bears still only the small cheliped. Rostrum of the female (in the male the tip is broken) acute, reaching almost to the end of ist antennular article, the flattenecl triangle just twice as long, measured in the middle line, as widë at its base and extending a little behind the corneae, so that the distance between the outer angles of the base and the corneae appears half as long as the latter. The frontal margin shows a rounded prominence near the rostrum, from which it is separated by an emargination ; both this prominence and this emargination are more conspicuous than in the variety Malensis (H. Coutière, 1. c. Fig. 48). Antennal region as in this variety, but the 2nd antennular article is one-third longer than the visible part of the ist and the blacle of the scaphocerite appears in the male a little shorter than the antennular peduncle, in the female nearly as long. In the small cheliped of the male the apex of the upper margin of the merus is obtuse and unarmed, while a few setae are inserted on it; the two other margins are also quite unarmed. Chela hardly more than 4-times as long as high, palm a little shorter than the fingers, the proportion being as 4:5. Lower border of the chela rounded, entire, upper border notched a little behind the articulation of the fingers, the notch passing on the outer side into a quadrangular depression or groove, while the inner side of the palm is smooth, entire and convex, in accordance with de Haax's description ; the fingers shut close together, the dactylus is smooth at the inner side, but one observes on the outer side a row of hairs that runs obliquely from the base upward to the middle of the upper border. The upper border of the dactylus is somewhat flattened at the base and hairy, some rather long setae are inserted also on the immobile finger and on the upper border of the palm. Second carpal segment of 2nd legs shorter than the ist, the proportion being 1,6 — 1,7. Measurements of 3rd legs in the female: merus 1,85; carpus i; propodus 1,44. Merus 6-times as long as wide, propodus 7,5-times; the propodus bears 7 spinules, long o, 37 — 0,52 mm., 273 S1BOGA-EXPEDITIE XXXIX a'. 52 406 besides one or two somewhat larger ones at the distal end; dactylus about half as long as the carpus and about one-third of the propodus. The male is 29 mm. long, the female 27 mm. General distribution: Japan (de Haan); New Caledonia (Coutière). f49. Alpheus öis-incisus de Haan var. variabilis de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 109. Confer: Alphens bis-incistts W. de Haan, Fauna Japonica, Crustacea, p. 179, Tab. XLV, fig. 3. Stat. 71. May 10 — June 7. Makassar. Depth up to 32 m. Mud, sand with mud, coral. 18 specimens of different size, males and females, some of which with eggs. The largest specimen, a male, is considered as the type of this new variable variety. In this specimen which is 25 mm. long, the acute rostrum reaches to the distal fourth of the visible part of ist antennular article, the rostrum is, however, narrower than in the variety Maleusis Cout., but not so narrow as in the variety sfylirostris Cout. (Coutière, Alpheidae Mald. and Lacc. Archip. 1905, PI. LXXXVI, figs. 48 and 49), for it is 3-times as long as broad at i 1 3 base; the upper surface is flattened, as in the two other varieties and as in the typical species, the lateral margins are distinct, though not very sharp and they make right angles with the perpendicular side-walls. The furrows between the rostrum and the orbital hoods are moderately deep, their outer margins are indistinct, rounded; at either side of the rostrum the frontal margin shows a slight, rounded prominence, between which and the rostrum the frontal margin appears concave. Antennular and antennal peduncles, stylocerite and scaphocerite as in the variety Malensis, but the outer margin of the scaphocerite appears more concave than in Coutière's figure 4S and the terminal spine, the point of which is directed inward, reaches to the micldle of the 2nd article, the stylocerite, finally, just reaches beyond the ist article. Spine on the basicerite extremely small, 0,2 mm. long. External maxillipeds reaching to the middle of third antennular article. In both chelipeds there is a spine at the far end of the infero-internal margin of the merus, in the larger cheliped larger than in the other. The large chela closely resembles that of the variety Maleusis, proportion between the length of the chela and the height of the palm 2,4, proportion between the height of the palm and that of the fingers 1,54, proportion between the length of the chela and that of the fingers 2,6; the two last numbers are for the variety Malensis respectively 1,6 and 2,75. The lobe on the rounded, upper margin of the palm is subacute, the much broader lobe of the lower margin is also acute, but its external margin runs less obliquely than in the figure 48a of Coutière's paper. Small chela in the male Balaeuice/>s-shaped, in the female not, different therefore from the variety sfy/irosfris. Not only the chela, but the whole cheliped of the male closely resembles that of the male of A. chiragriens H. M.-Edw.; proportion between the length of the chela and the height of the palm 4,3 (in the variety Malensis 4,7), proportion between the length of the chela and that of the fingers 2,1, the palm being slightly longer than the fingers; the dactylus agrees with that of A. chiragriens and the two depressions on the palm are shallow, but distinct. 274 407 In an ova-bearing female, long 23,5 mm., in which the rostrum resembles that of the desenbed male, the proportion between the length of the smaller chela and the height of the palm is 4,2 and the fingers are but very little shorter than the palm. In this specimen the prominence at either side of the rostrum is less conspicuous than in the described male. Only in three other specimens the rostrum agrees with that of the described male being flattened above, in the 14 other specimens the rostrum is not flattened, but rounded above, like in A. chiragricus\ these specimens, hovvever, for the rest fully agree with the preceding, especially as regards the characteristic form and colouration of the large chela, so that they are referred to the same variety, which therefore may bear the name of variabilis. In these specimens the prominence at either side of the rostrum is also less pronounced or wanting at all. The carpal segments of the 2nd legs are, in the typical male with flattened rostrum, 2,26 mm., 1,1 mm., 0,56 mm., 0,541:1111. and 0,92 mm. long, the second segment is about 3- times as long as thick; chela 1,66 mm. long (palm 0,8 mm., fingers 0,86 mm.). The second segment is only half as long as the first, while in the typical bis-incisus and in the two varieties of Coutière, the second segment appears comparatively longer. The following legs resemble those of A. chiragricus. Merus of 3rd legs 5,3-times as long as broad in the middle; the propodus that measures little more than two-thirds of the merus, appears 6,5-times as long as broad and bears 7 spines along its posterior margin. Dactylus almost half as long as the propodus. Characteristic is the colouration of the large chela, which is marked with an ochraceous spot on the posterior part of the quadrangular depression on the outer surface of the palm and often the notches of the upper and the lower border of the palm appear also ochraceous ; the fingers are sea-green, but their tips are violet. f50. Alp/ieus proseuchii'us de Man. J. G. DE RIAN, in: Notes from the Leyden Museum, Vol. XXX, 1908, p. ui. Stat. 114. July 8. o°58'.5 N., I22°55'E. Kwandang-bay-entrance. 75 m. Hard sand, very fine. 1 adult egg-bearing female and 2 younger specimens. Stat. 116. July 12. o°58'.5 N., I22°42'.5 E. West of Kwandang-bay-entrance. 72 m. Fine sand with mud. 1 adult egg-bearing female and 2 younger specimens. Closely related to A. pareitchirus Cout. Length of the largest specimen, the egg-bearing female from Stat. 114, 25 mm., cephalo- thorax, rostrum included, 8,5 mm. long, one-third of the whole length: this species attains a much larger size than A. pareuchirus. Carapace slightly convex longitudinally, smooth and gdabrous. Rostrum as in A. bis-incisus de Haan, acute and narrow, reachiiiCT almost to the end of O 'O ist antennular article, in younger specimens a little shorter and passing at the base of the eye- hoods, somewhat behind the corneae, into the surface of the carapace. The rostrum is flattened above, nar r o w-t r iangu la r, about 3-times as long as broad at base, the slightly-concave, lateral margins are rather sharp and somewhat overhang the deep orbito-rostral grooves, the outer, orbital maro;ins of which are rounded. The lensfth of the rostrum is one-fourth that of 27S 408 the carapace, rostrum included. Orbital region a little more than half as broad as the anterior margin of the carapace; its anterior margin is truncate like in A. pareuckirus, eye-hoods rounded, unarmed, corneae large. Telson almost twice as long as broad anteriorly, distance between the postero-lateral angles just half the greatest width ; anterior pair of spinules one and a half as far distant from the posterior than from the anterior margin. Second antennular article, in adult specimens, twice as long as thick, as long as the visible part of the first, third article two-thirds the second; according to Coutière's figure (Alpheidae Mald. and Laccad. Archip. 1905, PI. LXXXIV, fig. 43), in A. pareuckirus the second article appears distinctly longer than the first. Stylocerite terminating in a slender spine that is directed straightly forward and that reaches to the 2nd fourth part of the second article; in younger specimens it hardly reaches beyond the first. Basal spine of basicerite very small. Carpocerite as long as the scaphocerite, slightly longer than the antennular peduncle ; the scaphocerite, the outer margin of which is slightly concave, appears not yet 3-times as long as broad, being in the adult, egg-bearing female from Stat. 114 3 mm. long and 1,16 mm. broad. The terminal spine, that is directed inward, measures about one-third the length of the scaphocerite and appears less slender than that of A. pareuckirus, being only 21/s-times as long as broad at its base, in A. pareuckirus, however, 4-times; the terminal spine projects also less far beyond the tip of the blade, for it extends only with one-sixth of its length beyond it and the blade appears therefore also distinctly longer than the antennular peduncle. In young individuals the blade reaches to the end of the antennular peduncle and the 2nd joint of the latter appears here slightly shorter than the visible part of the ist. External maxillipeds slender, reaching to the end of second antennular article ; penultimate joint 4-times as long as thick, terminal joint one and a half as long as the penultimate and 8-times as long as broad at its base; a short tooth or spine at the distal end of the upper margin of the antepenultimate joint. Only one specimen bears the larger cheliped, a young specimen long 14,5 mm. without eggs and without the small cheliped, so that it is cloubtful whether it is a male or a female; this specimen was collected at the Stat. 114. The merus of this leg is rather slender, about 6-times as long as broad in the middle; upper margin unarmed at the extremity, infero-internal margin with a large, acuminate tooth at the far end and with 2 much smaller spinules in the middle. The chela much resembles that of A. pareuckirus, but the fingers are comparatively shorter. The chela, indeed, 7,2 mm. long and 2,4 mm. high, is just 3-times as long as high, but the fingers, 2 mm. long, measure little more than one-fourth the length of the chela. Just as in A. pareuckirus, the upper border of the palm is emarginate, immediately behind the articulation of the dactylus, and terminates in a subacute tooth ; from this emargination a groove or depression runs backward just below the rounded, upper border of the palm, both on the outer and on the inner face; the groove on the outer surface has parallel margins and reaches to the proximal third of the palm, that on the inner appears triangular and extends only to the middle. The lower margin of the chela appears as little emarginate at the 276 40g base of the immobile finger as in A. pareuchirus, but the lower margin of the palm is feebly ridged longitudinally; the fingers resemblc those of A. pareuchirus. Only two specimens, both from Stat. i 1 6, bear the smaller chcliped, viz. the adult egg- bearing female and a younger specimen. Merus, in the adnlt female, one and a half as long as that of the Iarger cheliped, also more slender, 7-times as long as broad in the middle ; tooth at the far end of the infero-internal margin a little smaller, on the middle also 2 small spinules. Chela as long as the carapace, rostrum included; fingers almost one and a half as long as the palm, the proportion being as 7:5, slender, tapering, shutting together and with the acuminate tips crossing one another. Palm almost cylinclrical, 2,5-times as long as high; upper border slightly constricted near the articulation of the dactylus with a tracé of the longitudinal groove on the outer face, perhaps also of that on the inner, for the rest smooth and glabrous. In the young specimen long 14,5 mm. from Stat. 114 the carpal segments of the second legs are 1,8 mm., 1,22 mm., 0,45 mm., 0,5 mm. and 0,8 mm. long, the second segment 7-times as long as thick; chela 1,34111111. long (palm 0,66 mm., fingers 0,68 mm.). In the adult, egg- bearing female from Stat. 116 the carpal segments are 2,52 mm., 1,6 mm., 0,64 mm., 0,7 mm. and 1 mm. long, the second segment 7-times as long as thick; chela 1,72 mm. long (palm 0,8 mm., fingers 0,92 mm.). These numbers show that the first segment of the slender carpus is one and a h a 1 f as long as the second and that the second is one and a half as long as the 5th, that the chela, finally, is slightly longer than the 2nd segment. In A. pareuchirus, however, the 2nd segment is not shorter than the ist. Of the three posterior legs the ischium is armed with a movable spine at the base; these legs are very slender, still more than those of A. pareuchirus. So e. g. are the meri of the third legs in the adult female from Stat. 116 9-times as long as broad, their distal extremity is quite unarmed ; carpus measuring three-fifths the length of the merus, slender, 8-times as long as thick distally; propodus one-third longer than the carpus, the proportion being as 4:3, slender, the propodus being 15- or 16-times as long as broad, the posterior margin with 7 spines that gradually increase in length, the spine at the distal extremity being half as long as the dactylus. Both margins of the propodus are beset with some long setae and long spiniform setae occur at the distal extremities of both margins. Dactylus very slender, simple, one-third the length of the propodus, slightly curved and flattened. In younger specimens the propodus appears a little less slender, the dactylus comparatively somewhat longer. f51. Alpheus Couticrei de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 107. Stat. 96. June 27. South-east side of Fearl-bank, Sulu-archipelago. 15 m. Lithothamnion- bottom. 1 male and 1 egg-bearing female. Stat. 282. January 15/17. 8°25'.2S., I27°i8'.4E. Anchorage between Nusa Besi and the N.E.- point of Timor. 27 — 54 m. Sand, coral and Lithothamnion. 1 egg-bearing female. A remarkable new species of the Edzuardsü group, which I have the pleasure to dedicate to the learned Carcinologist, by whom science has been enriched with such important works on the Family Alpheidae. 277 410 The female from Stat. 282 is 19,5 mm. long, the two other specimens 16 mm. Rostrum acute, projecting straightly forward and just reaching beyond the ist antennular article; as broad at its base as it is long, the oblique lateral margins of the rostrum make obtuse angles with the frontal margin that runs, from the rostrum, at first transversely, but soon curves backward and downward; the orbital region projects more forward than in most other species, for just half the first antennular article is covered by it. The rostrum is sharply carinate above and t h i s narrow, 1 i n e a r, compressed and prominent carina runs backward, in the adult female, to beyond the posterior third of the carapace, while it is slightly shorter in the two other specimens; the furrows by which the rounded and unarmed, orbital hoods are separated from the rostral carina, are rather broad and widen anteriorly, nearly as in A. Bouvieri var. Hululensis (Coutière, Alpheidae Mald. and Laccad. Archip. 1905, fig. 46). Gastric and cardiac regions coarsely punctate. Like in A. Arethusa, the abdominal pleura show a different form in the male and in the female. In the male they are produced inferiorly to an angle, subacute on the ist and the 2nd, but very acute on the four posterior, while the pleura of the 2nd are cordiform; in the female, however, the ist and the 2lld are much broader, with the infero-posterior angle obtuse and with the lower margin of the 2nd slightly concave; the two following are not triangular as in the male, but their posterior margin is rounded, convex and their lower margin is obtuse, the 5th and especially the 6th nearly agree with those of the male. The telson is 3-times as long as its posterior margin is broad and the latter just half as broad as the greatest width; between the two pairs of spinules that are rather large, 0,22 mm. long, about one-tenth the length of the telson, the upper surface appears broadly grooved from the anterior to the posterior margin, but the groove is rather shallow. Basal joint of the uropods that are but little longer than the telson, armed with two acute spines. Abdomen coarsely, though rather sparsely punctate. Second antennular article 2,5-times as long as thick, about twice as long as the visible part of the first, third article little longer than that visible part; pointed tip of the stylocerite reaching to the end of first article. Spinule on the basicerite extremely small, 0,06 mm. long. Carpocerite very little longer than the antennular peduncle and as long as the scaphocerite ; outer margin of the latter very concave and the terminal spine that is turned outward, reaches backward to the distal third of second antennular article ; the terminal spine projects far beyond the blade, that reaches to the middle of the third article. External maxillipeds reaching to the end of second antennular article. Merus of the large cheliped of the adult female 4-times as long as broad in the middle, upper margin somewhat uneven, unarmed at the apex, infero-external margin also slightly uneven ; the infero-internal margin bears along its whole length 10 or 11 rounded tubercles and a small acute tooth near the apex. Chela as long as the carapace, 2,5-times as long as the palm is high, fmgers hardly half as long as the palm, the total length of the chela being in proportion to that of the fingers as 10:3; the fingers are much less high than the palm, their height being in proportion to that of the palm as 2:3. The upper margin of the 278 4ii palm is distinctly notched near the articulation of the dactylus and the lobe behind the notch is rather obtuse; the notch passes on the outer side into a quadrangular depression, that occupies the upper third of the outer surface, on the inner in a quite shallow, triangular depression that runs along the upper margin and that almost extends to the carpal articulation. The distal half of the inner surface appears as a quadrangular depression, whereas the proximal half shows a scattered punctation. The lower margin of the palm presents a concave emargination at the base of the immobile finger, this emargination appears on the outer side triangular like in A. parvirostris and the truncate, posterior margin of this notch makes nearly a right angle with the lower border; immediately behind this notch one observes on the outer surface a shallow depression that extends to near the upper quadrangular one and that is recognized the best when the chela is looked at from the under side. Outer surface of palm and ihigers sparsely punctate. The large chela of the male from Stat. 96 is almost one-third longer than the carapace, it resembles that of the female, but the triangular depression on the inner face of the palm is almost inconspicuous, the inner face appears here somevvhat hairy. Unfortunately the small chela of the male is missing. In the small cheliped of the female the infero-external and the infero- internal margin are finely tubercular, the tubercles of the infero-internal margin are a little larger than those of the other and the upper margin is also uneven ; there is no apical tooth at the inner margin and the upper is also unarmed. Chela little more than half as long as the carapace and 4-times as long as the palm is high in the middle, fingers slightly longer than the palm. In the right leg of the second pair of the adult female the two first carpal segments are of equal length, the 5th just half as long and the chela, the fingers of which are one and a half as long as the palm, appears nearly as long as the 4th and the 5th segments taken topfether-, in the other leg the ist segment is somewhat long-er than the 2nd. Ischium of 3rd and 4th legs unarmed, meri also unarmed, those of 3rd pair 5-times as long as wide; propodus two-thirds the length of the merus, one-sixth longer than the carpus, the proportion being as 20: 17, and the propodus, also 5-times as long as broad, is furnished with 5 or 6 pairs of spinules; dactylus short, almost half as long as the propodus. Eggs numerous and small. f52. Alpheus leviusculus Dana. Alpheus Edwardsii, var. leviusculus J. D. Dana, U. S. Explor. Exped. Crust. 1852, p. 543, PI. 34, fig. 3. Stat. 250. December 6 '7. Kur-island. Reef. 1 ova-bearing female. Alpheus leviusculus Dana, which was considered by Coutière as an abnormal form of A. Edwardsii, though it occurs also in the list of species observed by him at Djibouti (Les Alpheidae, Paris, 1899, p. 15 and p. 4S6), is no doubt a good species, closely approaching to A. Bouvier i A. M.-Edw. and A. Bastardi Cout. The specimen from Kur-island is 15 mm. long, unfortunately Dana does not mention the length of his species. The acute rostrum is very short, reaching only to the 2nd third 279 4I2 of the visible part of first antennular article and is continued as a low, rounded ridge that at the end of the corneae already passes into the surface of the body and that is separated from the orbital hoods by narrow and shallow grooves. The rostrum of A. Bouvicri is described by Coutière as "une crête bien distincte, s'étenclant au dela des voütes", while in A. Bastardi the orbital hoods are not separated by grooves from one another (Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 908). As regards the orbital region and the frontal margin, A. leviusculus resembles A. Bouvicri (Coutière, 1. c. 1905, fig. 44). Second antennular article hardly twice as long as thick, little longer than the visible part of the first, while this visible part is but little longer than the third article. Stylocerite ending in a spine that is directed inward and that just projects beyond the first antennular article. Spine of the basicerite very small. Carpocerite as much longer than the antennular peduncle as in A. Bouvicri and A. Bastardi. The scaphocerite, the outer margin of which is straight, reaches to the tip of the antennular peduncle; the terminal spine that measures just one-fourth the length of the scaphocerite, extends backward to the anterior end of second antennular article and projects beyond the tip of the blade by one-fourth of its length, farther therefore than in A. Bastardi; the blade is probably less broadened distally than in this species. Telson 3-times as long as the posterior margin is broad, the latter a little more than half as broad as the greatest width; the inner spines near the postero-lateral angles half as long as the posterior margin is broad and extending with more than half their length beyond the tip. Merus of large chelipecl 3-times as long as broad distally, armed with a small, acute tooth at the far end of its infero-internal margin. Chela resembling that of A. Bouvieri and A. Bastardi, 3-times as long (7,5 mm.) as high (2,5 mm.), fingers half as long as the palm, the margins of which are nearly parallel ; as regards the notches on both margins and the form of the depressions on the outer and on the inner face of the palm, the chela also agrees with the two cited species. Merus of the small cheliped resembling the other, with a very small tooth at the end of the infero-internal margin; the chela agrees with Dana's figure 3^/, but the fingers are slightly longer than the palm and the chela is almost 5-times as long as high. The carpal segments of the 2nd legs are 1,32 mm., 0,7111111., 0,32111111., 0,3111111. and 0,54 mm. long, the second segment 3, 5-times as long as thick; the chela is 0,96 mm. long (palm 0,46 mm., fingers 0,5 mm.). Proportion between the first and the second segment 1,9 and the first segment is just as long as the sum of the three following; in Dana's specimen it was a little shorter. Merus of 31'1 legs 5-times as long as broad, the propodus, which is 8-times as long as broad and armed with 7 spines, is one-fifth longer than the carpus and measures five-sevenths of the merus; the dactylus, finally, measures one-fourth of the merus and little more than one- third of the propodus. Remarks. This species is certainly different from A. Bouvicri, but will perhaps once prove to be identical with A. Bastardi Cout. ; Dana's name lias then, however, the priority. A. levmsculus Spence Bate (Report Challenger Macrura, p. 549, PI. XCVIII, fig. 1) seems to be a different form. General distribution: Wakes Island, North Pacific (Dana). 413 53- Alpheus Euphrosyne de Man. Alp heus euphrosyne J. G. de Man, in: Zoolog. Jahrb. IX, Abth. f. Syst. 1897, P- 745» Taf. 36, fig. 64 and in: Memoires Soc. Zool. France, 1S98, p. 317, PI. IV, fig. 2. One specimen from the Postillon Islands, presented by Mr. Jacquin of Makassar. This specimen, 58 mm. long and without eggs, is much injured, having lost the ist, 3rd and 4111 legs; it is larger than the specimens hitherto known. The rostrum reaches almost to the middle of the visible part of first antermular article and the scaphocerite is a little longer than the antermular peduncle. The carpal segments of the 2nd legs are 4,4 mm., 2,9 mm., 0,9 mm., 0,9 mm. and 1,6 mm. long, the chela 2,75 mm. (palm 1,2 mm,, fingers 1,55111111.); the second segment is just one and a half as long as the first. General distribution: Java Sea (de Man); Bangkok (de Man). f54. Alpheus microrhynchus de Man. Alpheus sp. {microrhynchus) J. G. de Man, in: Zoolog. Jahrb. IX, Abth. f. Syst., 1897, p. 752, Taf. 2>6, fig. 65 and in: Mémoires Soc. Zoolog. France, XI, 1898, p. 318, PI. IV, fig. 3. Alpheus microrhynchus G. Nobili, in : Annali Mus. Civ. Storia Nat. Genova, Ser. 2a, Vol. XX, 1900, p. 479 and in: Bollet. Mus. Zool. Torino, XVIII, 1903, p. 7. Stat. 4. March 9. 7°42' S., H4°i2'.6E. Anchorage off Djangkar (Java). Shore. 1 adult female without eggs and 1 very young specimen. Stat. 71. May 10 — June 7. Makassar. Depth up to 32 m. Mud, sand with mud, coral. 1 adult female without eggs. The female from Makassar is full-grown, 85 mm. long, twice as large as the specimens heretofore described, the larger specimen from Stat. 4 is 61 mm. long. The small, acute rostrum reaches in the female from Makassar to the second third of the visible part of first antennular article, it just reaches beyond the rounded, anterior margin of the orbital hoods and is continued as a narrow, obtuse carina, that slightly broadens backward and that only extends as far as the corneae of the eyes; the depressions between this crest and the orbital hoods are broad, but not deep, though quite distinct. The orbital region projects slightly farther than in the younger specimens from Pontianak, described in 1897. Telson one4ïfth longer than its greatest width anteriorly and the latter is in proportion to the posterior margin as 4:3. Upper surface flattened, feebly grooved in the median line, anterior pair of spinules placed just in the middle and these spinules are one and a half as far distant from one another as those of the posterior pair. In this specimen the spines near the postero-lateral angles are missing, but in the female from Stat. 4 they are very small, the inner 0,25 mm. long, the outer half that length. In this specimen the telson appears less broad in proportion to its length, resembling more that of A. Euphrosyne and the anterior pair of spinules is inserted just in front of the middle. The antennular and antennal peduncles agree with those of the younger specimen, figured by me (1. c. 1897, fig. 65) and in both specimens the- scaphocerite is just as long as the antennular peduncle; the terminal spine extends, however, not so far backward, reaching only to the distal end of 2nd antennular article and in the large specimen from Makassar it 281 SIBOGA-EXPED1TIE XXXIXö'. 53 414 does not reach the rounded tip of the blade, for it only extends to the distal third part of 3ld antennular article. In this specimen the outer margin of the scaphocerite appears very slightly convex, but in the other from Stat. 4 it is straight; in the latter there is no spinule on the basicerite, whereas a very small one, 0,5 mm. long, exists in the specimen from Makassar. The large chela agrees with the cited description and figure. In the specimen from Makassar this chela is 47 mm. long, the palm 27 mm. long and 18,5 mm. high, in the female from Stat. 4 these numbers are 30111111., 17,5 mm. and 1 2 mm. This chela appears therefore one and a half as long as the carapace and 2,5-times as long as high. In both specimens the fingers of the small chela are decidedly longer than the palm. In the full-grown female from Makassar the proportion between the length of the chela and that of the fingers is 1,88. The height of the palm slightly decreases towards the articulation of the fingers and the proportion between its length and its greatest height near the carpal articulation is 2,33. In the much younger female from Bangkok described in 1898 (1. c), the fingers were just as long as the palm and the palm 3-times as long as high. The second legs are, in the adult female from Makassar, 1,4-times as long as the carapace; the carpal segments are 7,8 mm., 3,5 mm., 1,5111111., 1,5 mm. and 2,3111111. long, the chela 2,8 mm, long (palm 1,35 mm., fingers 1,45 mm.). The second segment appears a little longer in proportion to the fifst than in younger individuals. The following legs much resemble those of A. Enphrosyne (J. G. de Man, 1. c. 1897, Taf. 36, fig. 6\d). Merus of 3rd pair 5-times as long as broad and 1,36-times as long as the propodus which distinctly narrows distally and which is armed with 7 spinules along its posterior margin; dactylus about one-third of the propodus. Remarks. This species much resembles A. macrodactylus Ortm., but the rounded rostral carina is longer, reaching to somewhat behind the corneae and it is also more prominent ; the large chela lias a different form and the fingers of the small chela are longer in proportion to the palm ; the second carpal segment appears a little longer with regard to the first and the meri of the following legs are more slender. General distribution: Pontianak (de Man); Bangkok (de Man); Sarawak (Nobili). f55. Alpheus Audouini Cout. Alpheus Audouini H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 91 1, PI. LXXXVII, fig. 52. Stat. 131. July 24/25. Anchorage off" Beo, Karakelang-islands. Reef. 7 specimens, 6 of which are much injured and have lost the first pair of legs. Stat. 174. August 28 — 29. Waru-bay, North coast of Ceram. Reef. 1 young specimen, without the large cheliped, probably belonging to this species. Stat. 181. September 5/1 1. Ambon-anchorage. Reef. 5 specimens, 3 of which with eggs. Stat. 213. September 26 — October 26. Saleyer-anchorage and surroundings. Reef. 1 egg- bearing female. In his important work on the Alpheidae of the Maldive and Laccadive Archipelagoes Coutière regards as different species A. Edwardsii Aud., A. chiragricus H. M.-Edw. and he describes as new A. Audouini Cout.; A. chiragricus should differ from the two others by the 282 4i5 more narrow, subulate rostrum, but with regard to the two others he indicates no other difference than the lobes both on the upper and on the lower border of the palm of the large chela terminating in A. Edwardsii in an acute spine, whereas in A. Audouini they should be obtuse, "en ogive". Of the 4 specimens of A. chiragricus from the Mergui Archipelago that are lying before me, these lobes end in the largest female in a spine, but in the three other specimens they are more or less obtuse. This character appears therefore to be of doubtful value. In the three larger chelae present in the "Siboga" specimens these lobes show the form characteristic of A. Audouini and therefore these specimens are referred to this species. One of the egg-bearing females from Amboina is 28 mm. long. The acute rostrum, nearly as broad at its base as it is long, reaches almost to the end of first antennular article and projects horizontally forward; it is continued in a broad, low and rounded ridge, that is separated by shallow grooves from the orbital hoods. A rounded prominence at either side of the rostrum is very small, so that the frontal margin appears nearly straight. Antennal and antennular peduncles with scaphocerite and stylocerite as in A. Edwardsii (Coutière, 1. c. fig. 50). The large chela agrees with Coutière's figure 52a, but the height of the fingers is a little smaller in proportion to the height of the palm: the chela, indeed, is 12,5 mm. long, the palm 8 mm. long and 5,5 mm. high, the fingers 3,6 mm. high. The chela presents therefore a different shape from that of A. chiragricus and more resembles that of A. bis-incisus var. variabilis, which variety, however, at first sight differs by the more prominent and narrower rostral carina. The small chela of this female nearly agrees with that of the variety variabilis of A. bis-incisus. Proportion between the length of the first and of the second carpal segments in this female 1,8, according to Coutière it should be 1,65. The following legs as in A. chiragricus. Xew researches based on complete and well-preserved specimens are necessary to decide the question whether this pretended species, A. Audouini, is really different from the Egyptian A. Ediüardsii Aud. General distribution: From the Red Sea to New Zealand and the Hawaiian Islands (Coutière). 56. Alphezis chiragricus H. M.-Edw. Alpheus chiragricus H. Milne-Edwards, Hist. Nat. Crustacés, II, 1837, p. 354. Alpkeus chiragricus H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, passim in texto, p. 912, PI. LXXXVI, fig. 51. Alpheus Edwardsii J. G. de Man, in: Journal Linnean Soc. London, XXII, 1S88, p. 266 and in: Archiv f. Naturg. 53. Jahrg. 1888, p. 516 and in: Zoolog. Jahrb. IX, Abth. f. Syst. 1897, p. 745 ff., PI. 36, fig. 640' and in: Mémoires Soc. Zool. France XI, 1898, p. 312, PI. IV, fig. 1 and in: Abhandl. Senckenberg. Naturf. Gesells. XXV, 1902, p. 8S0— 883, passim in texto, PI. XXVII, fig. 62b and 62 c. Stat. 33. March 24/26. Bay of Pidjot, Lombok. 9 — 22 m. Mud, coral and coralsand. 1 young male. Stat. 34. March 27. Anchorage off Labuan Pandan, Lombok. Coralreef. 2 specimens, one of which with eggs, but in both the legs of ist pair are missing. Stat. 51. April 19. Madura-bay and other localities in the southern part of Molo-strait. 1 young specimen captured at a depth of 54 — 90 m. and another which is still younger and infested by a Bopyrus, from the reef; in both specimens the legs of ist pair are missing. 283 416 Stat. 115. July9/n. East side of Pajunga-island, Kwandang-bay. Reef. 15 mutilated specimens, probably belonging to this species. Stat. 127. July 20/21. Taruna-bay, Great Sangir-island. Reef. 1 young male. Stat. 162. August 18. Between Loslos and Broken-islands, West coast of Salawatti. iS m. Coarse and fine sand with clay and shells. 1 egg-bearing female. Stat. 163. August 18 — 20. Anchorage near Seget, West entrance Selee-(Galewo)-strait. Reef. 1 young male and 1 young female, the latter infested by a Bopyrid in the abdomen. Stat. 176. August 30/31. Anchorage off Lilintah, South coast of Misool. Reef. 1 ova-bearing female. Stat. 181. September 5 — II. Ambon-anchorage. Reef. 14 specimens, males and females, some of which with eggs, but mostly young. Stat. 299. January 27/29. I0°S2'.4S., I23°i'.iE. Buka- or Cyrus-bay, South-coast of Rotti- island. 34 m. Mud, coral and Lithothamnion. 1 ova-bearing female. Stat. 311. February 12/13. Sapeh-bay, East coast of Sumbawa. Reef. 2 specimens, one of which with eggs, without the legs of the ist pair. This species of which I have treated already several times, is considered by Professor Coutière as a subspecies of A. Edwardsii Aud. (H. Coutière, 1. c. 1905), from which it should differ by the subulate form of the rostrum : I don't venture to decide this difficult question, but I wish to refer our specimens to A. chiragricus, to which they certainly belong. According to H. Milne-Edwards A. chiragricus attains a length of 3 inches. The largest specimen measured by me, an ova-bearing female probably from Atjeh, had a length of 65 mm. (de Man, 1. c. 1897), Dut tne largest specimens, collectecl by the "Siboga", are of a much smaller size, namely an ova-bearing female long 27 mm. and a male long 2Smm., both from Amboina. The rostrum projects either horizontally forward or is slightly directed upward as in the male, long 28 mm. The two male and the two female specimens from the Mergui Archipelago, described by me in 188S and of which I have treated in the quoted following papers, are again lying before me. Of the large chela of the larger of the two females, figured by me 1. c. 189S, PI. IV, fig. 1 and 1. c. 1902, PI. XXVII, fig. 62^ and 62 c', the fingers are little shorter than the palm, the proportion being as 4 : 5 and in this specimen the lobe both on the upper and on the lower border of the palm ends in an acute tooth ; in the other specimens, however, the fingers are shorter and the lobes much less acute. In the younger male, long 23 mm., the proportion between the length of the fingers and that of the palm is, indeed, as 3 : 4 and, both in the larger male long 33 mm. and in the younger female long 24111111., the palm is one and a half as long as the fingers; the length of the fingers appears therefore somewhat variable. Merus of third legs 5-times as long as broad. In the younger female from the Mergui Archipelago these joints are 4,6 mm. long and 0,95 mm. broad, in a female of equal size from Amboina these numbers are 4,4 mm. and 0,88 mm. ; the propodi, that measure two-thirds the meri, are 6-times as long as broad, in the female from the Mergui Islands they are 3,2 mm. long and 0,52 mm. broad, while in the female from Amboina these numbers are 3 mm. and also 0,52 mm. A. chiragricus may easily be recognized by the narrow, subulate rostrum. General distribution: "Mers d'Asie" (H. Milne-Edwards) ; Hongkong (Coutière) ; Mergui Archipelago (de Man); Atjeh, Java Sea, Bay of Batavia, West-Celebes, Amboina (de Man). 284 4i 7 57- Alpkeus crassimanus Heller. Alpkeus crassimanus C. Heller, Crustaceen der Novara-Reise, 1865, p. 107, PI. X, fig. 2. Alpluus crassimanus C. Spence Bate, Report Challenger Macrura, 18S8, p. 554, PI. XCIX, fig. 2. Alphcus crassimanus J. G. de Man, in: Abhandl. Senckenb. Naturf. Gesells. XXV, 1902, p. 880, PI. XXVII, fig. 62. Alphcus lobidens H. Coutière, in: Notes from the Leyden Museum, XIX, 189S, p. 199. Stat. 50. April 161S. Bay of Badjo, West coast of Flores. Depth up to 40 m. Mud, sand and shells, according to locality. 1 young male. Stat. 60. April 2j 28. Haingsisi, Samau-island, Timor. Shore. 1 very young male. Stat. 71. May 10 — June 7. Makassar. Depth up to 32 m. Mud, sand with mud, coral. 1 male and 1 ova-bearing female. Stat. 86. June 18/19. Anchorage off Dongala, Palos-bay, Celebes. Shore. 3 males, 2 of which are very young. Stat. 99. June 282930. 6°7'.5 N., I20°26'E. Anchorage off North-Ubian. 16 — 23 m. Litho- thamnion-bottom. 1 very young male. Stat. 176. August 3031. Anchorage off Lilintah, South coast of Misool. Reef. 1 male and 1 ova-bearing female. Stat. 213. September 26 — October 26. Saleyer-anchorage and Surroundings. Reef. 1 young male. The specimens agree with two from Tobelo, Halmahera, desenbed by me in 1902 (l.c), that are lying before me.- The largest specimens are the male long 25 mm. and the female long 26 mm. from Makassar, A. crassimanus attains, however, a length of 44 mm. (de Man, l.c). In the female the rostrum almost reaches to the middle, in the male just beyond the middle of the visible part of fust antennular article; characteristic of this species is the narrow, compressed, rostral carina, which, slightly broadening backward, is separated by deep, narrow grooves from the prominent, rounded, orbital hoods; in a lateral aspect the carina is concealed by the latter. In the largest male, long 25 mm., from Stat. 86 the rostrum extends almost to the end of ist antennular article. The small chela of the male from Makassar fully agrees with Coutière's figure (Les Alpheidae, 1899, p. 239, fig. 293); this chela is 9,75 mm. long, the palm just as long as the fingers and 3,4 mm. high. In the largest male from Stat. 86, that has the same size as the male from Makassar, both chelipeds are smaller and more slender. The small chela, indeed, is only 7,5 mm. long, the palm 3,4 mm. long and 1,9 mm. high; the large chela is 9.5 mm. long, the palm 5,5 mm. long and 3,7 mm. high, while these numbers are, for the large chela of the male from Makassar, 13 mm., 7 mm. and 6,1 mm. The carpal segments of the second legs of the young male from Stat. 60, which is 13,5 mm. long, measure 0,96 mm., 0,82 mm., 0,34 mm., 0,36 mm. and 0,62 mm., the chela is 1.06 mm. long (palm 0,52 mm., fingers 0,54 mm.). In this specimen the second segment appears but a little short er than the first and this fact, combined with the measurements indicated in my work of 1902, proves that the proportion between the length of the first and of the second segment is variable. In the specimen from Stat. 99 which has the same size as that from Stat. 60, the second segment is hardly shorter than the first. The two specimens from Stat. 176 are noteworthy, because the second and following legs are of a somewhat stouter shape. They are only 1 5 mm. long and the ova of the female, though few in number, show the same diameter (0,5 mm.) as those of adult specimens. Merus 285 418 of second legs 5-times as long as broad, in the adult specimens from Stat. 71 6,4-times. Carpal segments in the female 1 mm., 0,7 mm., 0,3 mm., 0,3 mm. and 0,5 mm. long, second segment hardly 3-times as long as thick in the middle, third segment hardly longer than thick ; chela 1 mm. long (palm 0,54 mm., fingers 0,46111111.). In the male the merus of second legs is 5,3- times as long as broad, the carpal segments are 0,88 mm., 0,78111111., 0,26 mm., 0,28 mm. and 0,44111111. long, second segment 3,45-times as long as thick, third segment 0,23 mm. thick; chela 0,92111111. long (palm 0,5 mm., fingers 0,42111111.). In the adult specimens from Stat. 71 the second segment is 3,7-times and the third one and a half as long as thick. Merus of third legs in the male 3,6-times, in the female 3, 3-times as long as broad, its shape being stouter than in full-grown specimens, in which this joint is 4,7-times as long as broad (de Man, 1. c. p. 883); as regards the following joints the specimens from Stat. 176 a°rree with the adult. Remarks. Through the kindness of Dr. Horst of the Leyden Museum I was enabled to study the female from Amboina which was referred by Coutière to A. lobidens de Haan : this female proved to belong to A. crassimanus. (Vide also p. 328, footnote). General dist r i bu t i o n : Nicobar Islands (Heller): Djibouti (Coutière); Amboina (de Man); Ternate (de Man); Tobelo and Kau, Halmahera (de Max). f58. Alphcus pareuchirus Cout. Alfheus pareuchirus H. Coutière, Alpheidae Mald. and Lacc. Archip. 1905, p. 906, PI. LXXXIV, fig- 43- Stat. 51. April 19. Madura-bay and other localities in the southern part of Molo-strait. 54 — 90 m. Fine grey sand; coarse sand with shells and stones. 14 specimens of different size. Stat. 99. June 28/29/30. 6°7'.5N., I20°2Ó'E. Anchorage off North-Ubian. 16 — 23 m. Litho- thamnion-bottom. 4 specimens. Stat. 109. July 5/6. Anchorage off Pulu Tongkil, Sulu-archipelago. ,5 m. Lithothamnibn-bottom. 1 young specimen. Stat. 164. August 20. i°42'.5 S., i30°47'.5 E. Between Misool and New Guinea. 32 m. Sand, small stones and shells. 1 young male and 1 younger specimen. Stat. 260. December 16 and 18. 5°36'.5S., I32°55'.2E. - ■ 2,3 miles N., 6f W. from the North point of Nuhu Jaan, Kei-islands. 90 m. Sand, coral and shells. 1 female. Stat. 274. December 26. 5°28'.2S., I34°53'.9E. East coast of Jedan-islands. 57 m. Sand and shells. Stones. 2 specimens. Stat. 303. April 27/28. Haingsisi, Samau-island near Timor. 36 m. Lithothamnion. 6 specimens. These specimens, in the largest of which, males and ova-bearing females, the carapace is 5x/4 mm. long, agree pretty well with Coutière's description and figures, except that the triangular groove on the inner side of the palm of the large chela, which in the typical specimens should be "tres faiblement marquée", appears well marked, as deep as the groove on the outer side and with its lower border quite distin et and often coloured. In the adult male from Stat. 99 the merus of the larger cheliped is 2,6-times as long as broad in the middle and the merus of the smaller fully resembles it. The chela appears a little hier her in proportion to its length than in the younger specimens, described by Coutière, the proportion being] 2,67, but in a younger male from Stat. 51 like also in the females 286 419 the chela is 3-times as long as high. In the adult male from Stat. 99 the fingers are a little longer than in the typical specimens, the proportion between the length of the chela and that of the fingers being 2,35, but in the younger males the proportion is 2,6. In an ova-bearing female from Stat. 51, long 13,5 mm., the large chela is 3,2-times as long as high, but the fingers that are just as long as the palm is high, appear jnuch shorter than in the male and this is also the case in the ova-bearing female, long 14,5 mm., from Stat. 274, the proportion being here 3 both for the length of the fingers and the height of the palm. The triangular groove on the inner side of the palm appears larger than in Coutièke's figure 43 a and the rather prominent, lower border of this groove is of a violet colour, like the inner face of the immobile finger and the base of the dactylus. The small chela of the adult male from Stat. 99, just as long as the carapace, has a rather stout form, the proportion between the length of the chela and the height of the palm being 3,3; the fingers are very little shorter than the palm, the proportion being 1,07. Whereas the lower border of the palm appears but slightly sinuous, the upper is distinctly notched, the posterior lobe being rather acute; both on the outer and on the inner face the triangular groove is well-developed, deep, extending distally downward to the middle of the palm. As in A. hoplocheles the palm ends distally, at either side of the articulation of the dactylus, in a sharp tooth, the tooth at the inner side being violet coloured and somewhat larger than the other. Dactylus Ba/aemce/>s-shaped, the upper face lanceolate, 2,5-times as long as broad, fiattened above but with a prominent ridge that runs from the proximo-internal angle to the obtuse tip ; lateral carinae beset with long setae. The small chela of the adult egg-bearing female from Stat. 51, long 13,5 mm., measures almost two-thirds the length of the carapace and is 5-times as long as high; palm without grooves or notches, fingers simple, slightly longer than the palm, the proportion being 1,15. In the adult, egg-bearing female, long 14,5 mm., from Stat. 274 the small chela agrees with that just described, but the fingers are longer, the proportion between their length ancl that of the palm being 1,27. In Coutière's figure 43 £ the second carpal segment appears slightly loneer than the first and the fourth a little longer than the third: this is also the case in the specimens collected by the "Siboga", but the length of the second segment is somewhat variable. In the adult male from Stat. 99 the carpal segments are 0,95 mm., 1,23 mm., 0,44 mm., 0,46 mm. and 0.64 mm. long, the chela 0,94 mm. long (palm 0,4 mm., fingers 0,54 mm.) ; in a younger male from Stat. 51 these numbers are, in the same succession, 0,82 mm., 1 mm., 0,38 mm., 0,42 mm. and 0,5 mm., the chela is 0,8 mm. long (palm 0,35 mm., fingers 0,45 mm.). In the ova-bearing female from the same station the segments measure 0,9 mm., 1,06 mm., 0,36 mm., 0,4 mm. and 0,56 mm., the chela is 0,84 mm. long (palm 0,4 mm., fingers 0,44 mm.) and in the adult female from Stat. 274, finally, the segments are 1 mm., 1,1 mm., 0,36 mm., 0,4 mm. and 0,5 mm. long; the chela measures 0,88 mm. (palm 0,4 mm., fingers 0,48 mm.). Whereas in the first mentioned specimen the second segment appears almost one-third longer than the first, it is only one-tenth longer in the female from Stat. 274. The carpal segments are rather slender, the third segment, e. g., being in the male from Stat. 99 2,44-times as long as thick in the middle, in the younger male 2,5-times, in the female from Stat. 51, 2S7 420 however, 2,1-times and in that from Stat. 274 only 1,93-times; in the last mentioned specimen the carpal segments are hardly more slender than in the variety Leucothea. In the adult male from Stat. 99 the merus of 3rd legs appears 6,4-times, in the adult female from Stat. 51 6,26-times, but in a male from the same station, the carapace of which is 4 mm. long, almost 7-times as long as broad in the middle, just as in the typical specimens, and in this male the distal extremity of the lower margin appears rather sharp, so that, in the adult specimens, the meri are somewhat less slender than in the young. Carpus four-fifths the length of the propodus, dactylus in the adult male a little more than one-third of the propodus, but measuring in the younger male and in the adult female almost half the length of it, the length of the dactylus being slightly variable. Rem ark. It is doubtful whether the species, described by Pearson under this name, is indeed the true A. pareuchirus, for, according to this author, the ischium of third legs should be unarmed. (J. Pearson, Ceylon Pearl Oyster Report, 1905, p. 86). General distribution: Maldive and Laccadive Archipelago (Coutière). f59. Alpheus pareuchirus Cout. var. Lcitcothca de Man. J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 105. Stat. 2. March S. 7°25'S., 113° 16' E. Madura-strait. 56 m. Grey mud with some radiolariae. 1 male. Stat. 49:\ April 14. 8°23'.5S., II9°4'.6E. Sapeh-Strait. 70111. Coral and shells. 12 specimens, among which 1 adult egg-bearing female and 7 males of different size. Stat. 51. April 19. Madura-bay and other localities in the southern part of Molo-strait. 54 — 90 m. Fine grey sand; coarse sand with shells and stones. 1 male and 1 ova- bearing female. Stat. 86. June 18/19. Anchorage off Dongala, Palos-bay, Celebes. 36 m. Fine, grey mud (river-mud). 2 specimens. Stat. 96. June 27. South-east side of Pearl-bank, Sulu-archipelago. 15 m. Lithothamnion-bottom. 1 adult female without eggs. Stat. 99. June 28/29/30. 6°7'.5 N., i20°26'E. Anchorage off North-Ubian. 1 young female taken at the surface of the sea. Frontal margin at either side of the rostrum straight, transverse, not at all excavate, rostrum as in the typical species. Spiniform tip of the stylocerite extending just beyond the first article. Carpocerite very little longer than the upper peduncle ; the scaphocerite, the terminal spine of which is decidedly curved inward, is as long as the carpocerite and the blade usually reaches to the end of the antennular peduncle. Merus of the large cheliped of a male long 16,5 mm. from Sapeh-Strait 3-times as lono- as broad in the middle, infero-internal margin with one or two spinules and, at the apex, with a spiniform tooth. Chela a little longer than the carapace, somewhat high er than in Coutière's specimens, the proportion between the total length and the height of the palm being 2,65. Fingers as long as in the typical species, proportion between the length of the chela and that of the fingers being 2,6. Both the groove on the outer face and that on the inner reach a little more downward than in the typical species; the triangular groove on the inner surface is just as deep as that on the outer and the lower boundary of that inner groove, 288 421 which is slightly hairy, appears somewhat sinuous and not col o u red, somc hairs occur also on the inner face of the palm and immobilc finger. In an ova-bearing female, long 18 mm., from the same station, the large chela is almost 3-times as long as high, viz. 2,8-times, the fingers are a little longer than in the male, the proportion being 2,47. In very young specimens, finally, in which the carapace is 3,75 mm. long, the large chela is, like in the typical species, 3-times as long as high, but the grooves on the palm are as in the adult. Merus of small cheliped of the male also 3-times as long as broad and also armed with a spinule in the micldle and, at the apex, with a spiniform tooth. Chela a little shorter than the carapace, 4-times as long as high, fingers a little shorter than the palm, the proportion between the length of the palm and that of the fingers being 1,08 (palm 2,7 mm. long, fingers 2,5 mm., in the male long 16,5 mm.). Upper border of the palm distinctly notched, triangular groove on the outer surface extending downward almost to the middle, triangular groove on the inner side just as deep, but reaching less far downward, inner face of palm and fingers hairy. At either side of the articulation of the dactylus the palm terminates in an acute tooth like in A. hoplocheles Cout. ; lower border of the palm not notched, but only slightly sinuous. Dactylus Ba/aeuiceps-shaped, its upper face slightly convex transversely, 3-times as long as broad; lateral carinae with long setae. Only one female bears the small cheliped, namely that from Stat. 96, which is 18,5 mm. long. Merus a little more than 3-times as long as broad. Chela measuring two-thirds the length of the carapace, 4-times as long as high, fingers a little longer than the palm, the proportion being 1,1 ; palm and fingers hairy on the inner side, without grooves or notches, dactylus simple, teeth at either side of the articulation rudimentary. In the adult male from Stat. 49a the carpal segments of the second legs are 1,2 mm., 1,08 mm., 0,4 mm., 0,4 mm. and 0,68 mm. long, the chela 1,14111111. long (palm 0,54111111., fingers 0,6 mm.); in a very young male these numbers are in the same succession 0,78 mm., 0,7 mm., 0,28111111., 0,28 mm. and 0,44 mm., chela 0,83 mm. (palm 0,37111111., fingers 0,46 mm.) and in an ova-bearing female the carpal segments are 1,35111111., 1,3 mm., 0,44111111., 0,46111111. and 0,68 mm. long, the chela 1,32 mm. long (palm 0,6 mm., fingers 0,72 mm.). In this variety the second segment is a little shorter than the first and the segments show a rather not slender form, the third e. g. being 1,65 — 1,85-times as long as thick. Ischium of third and fourth legs, like in the typical species, with a movable spine. Merus of third legs less slender than in the typical species, being in the adult male and in the adult female 5, 4-times as long as broad in the middle ; distal extremity of the lower margin rounded, not acute. Propodus 1,35-times as long as the carpus, with 8 pairs of spinules; dactylus almost half as long as the propodus. The propodus and the carpus are rather hairy, like in the typical species, some setae occur also on the merus. f 60. AlpJicus leptochiroid.es de Man. J. G. DE MAN, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 1 10. Stat. 260. December 16 and 18. 5°36'.5S., I32°55'.2E. 2,3 miles N. 630 W. from the North point of Nuhu Jaan, Kei-islands. 90 m. Sand, coral and shells. 1 male. 289 SIBOGA-EXPEDITIE XXXIX fl'. 54 422 A new species of the Edwardsii group, closely approaching to A. pareuchirus Cout. and to A. leptocliirits Cout. This specimen, 12,5 mm. long, is probably still young. Rostrum acute, narrow, one and a half as long as broad at its base and reaching to the distal fifth of the visible part of first antennular article; the rostral carina which between the eyes is narrow, strongly compressed, though obtuse, is traceable almost to the middle of the carapace, but, posterior to the orbital hoods, it gradually widens and becomes more and more indistinct. Frontal margin at either side of the rostrum straight, whereas it appears here decidedly concave in A. leptochirus-, grooves between the rostrum and the rounded, orbital hoods moderately broad and deep. Telson 4-times as long as its posterior margin is broad, the latter half as broad as the greatest width; upper surface not grooved. Second joint of antennular peduncle very slightly shorter than the visible part ot the first, third article measuring two-thirds of the second; in A. leptochirus the second article appears distinctly longer than the visible part of the first (Coutière, Alpheidae Mald. and Laccad. Archip. 1905, fig, 54). Stylocerite larger, i. e. broader, than in the other species and ending in a spine that reaches to the 2nd fourth part of second antennular article. Basicerite with a small spine, long 0,14 mm., on the lower side; carpocerite just as long as the antennular peduncle, the scaphocerite the outer margin of which is concave, projects beyond the antennular peduncle almost as far as the 3ld joint of the latter is long; the blade reaches just beyond the tip of the antennular peduncle and the terminal spine which is slightly curved inward, extends by two fifths of its length beyond the tip of the blade. Merus of the large cheliped nearly 4-times as long as broad in the middle, apparently of a more slender form than in A. leptochirus-, infero-internal margin with acute tooth at the apex. The large chela, one-fourth longer than the carapace, much resembles that of A. leptochirus, the chela being 3-times as long as broad (high) and the fingers measuring little more than one-fourth of the total length : the proportion, indeed, between the latter and the length of the fingers is 3,5, like in A. hptochirus. The narrow notch near the articulation of the dactylus passes into the long, narrow, quadrangular depression on the outer face, that extends to beyond the middle of the palm, the depression on the inner surface is triangular, but rather shallow; differently from A. leptochirus but nearly as in A. pareuchirus Cout., the lower border is not notched, but only slightly sinuous. The fingers are less high than the palm, just as in A. leptochirus. Merus of the small cheliped 5-times as long as broad in the middle, its infero-internal margin armed with two small spinules and, at the apex, with an acute tooth. Chela measuring two-thirds the length of the large chela, slender, 5, 5-times as long as high; fingers just as long as the palm, dactylus Balaeuiceps-shaped, somewhat less broad than that of A. leptochirus (Coutière, 1. c, fig. 54 b), when looked at from above. Carpal segments of the second legs 1,2 mm., 1 mm., 0,42 mm., 0,5 mm. and 0,7 mm. long, chela 1,14 mm. long (palm 0,54 mm., fingers 0,6 mm.); the second segment is slightly shorter than the first and the first appears just as long as the two last segments taken together and about as long as the chela; fingers little longer than the palm. The following legs resemble those of A. leptochirus. So e. g. the meri of the third legs, 290 that are, like those of the fourth, unarmed and 7,5-times as long as broad; the carpus measures three-fourths of the propodus, which is 3-times as long" as the slender, slightly curved dactylus. f 61. Alpheus Polyxo de Man. J. G. de Max, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 108. Stat. 240. November 22 till December 1. Banda-anchorage. Black sand, coral and Lithothamnion- bank in iS — 36 m. 1 male and 1 egg-bearing female. Both specimens are adult, the male is 22 mm. long, the female 25 mm., the former lacks the large cheliped and in the female both chelipeds are missing. These specimens evidently belong to a new species, but it is doubtful whether they pertain to the Edwardsii group or not. The rostrum of the male is acute, twice as long as broad at its base and reaches to the end of first antennular article ; in a lateral view the lower margin projects almost horizontally forvvard, while the upper appears to ascend, slightly, from the point backwards. The rostrum is continued as a rather low and rounded carina which is separated by moderately broad, though rather deep grooves from the orbital hoods and which, somewhat widening backward, passes at the base of the latter into the surface of the carapace. In the female the rostrum appears almost as broad at its base as it is long and it extends only to the distal fourth of the visible part of first antennular article; the rostral carina is also broader than in the male and much resembles that of A. Audouini. At either side of the rostrum the frontal margin runs in the female S-like, obliquely forward and outward, in the shape of a rounded prominence, which prominence, in the male much less marked, appears in a lateral view acute, like in A. euchirus Dana. Carapace and abdomen are smooth and glabrous. Telson 3,4-times as long as its posterior margin is broad, anteriorly twice as broad as the posterior margin; upper surface slightly flattened in the middle, but not grooved, smooth and glabrous. Spinules of the upper surface rather large, inserted nearly midway between the mid-line of the telson and the lateral margins ; anterior pair inserted just in front of the middle, posterior pair almost one and a half as far distant from the posterior margin as from the anterior pair; posterior margin slightly prominent in the middle, inner spinules near the postero-lateral angles measuring one-third the width of the posterior margin. Basal joint of caudal swimmerets armed with two short spines of equal length ; inner uropod broad, flattened above with the posterior margin rounded, exopod with the movable spine at the postero-lateral angle uncoloured. Second antennular article in the male 2,4-times, in the female 2,6-times as long as thick in the middle, one and a half as long as the visible part of the first; this visible part appears hardly longer than the third article. Stylocerite terminating in a slender spine that reaches just beyond the first article, one-sixth or one-eighth the length of the second. Basicerite armed on the lower side with a small spine, 0,5 mm. long, reaching about to the distal third of the visible part of first antennular article; carpocerite projecting beyond the end of the antennular peduncle about by one-third the terminal article. The scaphocerite, 291 424 the outer margin of which is slightly concave, is nearly as long as the carpocerite ; the terminal spine reaches to the middle of second antennular article, projecting by one-third of its length beyond the tip of the blade which is fringed with long hairs and which reaches almost to the end of the antennular peduncle. Terminal joint of outer footjaws 4,5-times as long as broad, gradually narrowing distally. The small cheliped of the male closely resembles that of ^4. euchirus Dana, which species was formerly regarded by me, though at that time already with some doubt, as a variety of A. HippotJioc de Man (J. G. de Man, in: Zoolog. Jahrb. IX, Abth. f. Syst. 1897, p. 754, Taf. 36, fig. 66 — 66s-sha.ped. 64. Alpheus pctcificus Dana. Alpheus pacificus J. D. Dana, U. S. Explor. Exped. Crustacea, p. 544, PI. 34, fig. 5. Alpheus pacificus H. Coutière, Alpheidae Mald. and Laccad. Archip. 1905, p. 909, PI. LXXXV and LXXXVI, fig. 47. Alpheus gracilidigitus E. J. Miers, Report Voyage H. M. S. "Alert", 18S4, p. 2S7. Alpheus gracilidigitus J. G. de Man, in: Max Weber's Zoolog. Ergebn. II, 1S92, p. 406, Taf. XXV, fig. 32 and, passim in texto, in: Mémoires Soc. Zool. France, 1S9S, p. 324, PI. IV, fig. 5, 5«. Alpheus gracilidigitus G. Nobili, in : Annali Mus. Civ. Storia Nat. Genova, Serie 2», Vol. XX, 1S99, p. 233. Stat. 33. March 24/26. Bay of Pidjot, Lombok. 22 m. and less. Mud, coral and coralsand. 1 male. Stat. 58. April 25. Anchorage off Seba, Savu. Reef. 3 ova-bearing females of different size. Stat. 93. June 24/25. Pulu Sanguisiapo, Tawi-Tawi-islands, Sulu-archipelago. Reef. 4 speci- mens, 3 of which with eggs. Stat. 133. July 25/27. Anchorage off Lirung, Salibabu-island. Reef. 16 specimens of small size, many of which, however, are ova-bearing. Stat. 144. August 7/9. Anchorage north of Salomakiëe-(Damar)-island. Reef. 3 young speci- mens, 1 of which with eggs. Stat. 169. August 23/25. Anchorage off Atjatuning, West coast of New Guinea. Reef. 2 spe- cimens, probably males. Stat. 193. September 13/14. Sanana-bay, East coast of Sula Besi. Reef. 1 very young specimen. Stat. 209. September 23. Anchorage off the South point of Kabaëna-island. Reef. 1 very young specimen. Stat. 225°. November 8. South-Lucipara-island. Reef. 1 very young specimen. 29S 428 Stat. 231. November 14/18. Ambon-anchorage. Reef. 1 male and 1 ova-bearing female of medium size. Stat. 234. November 19/20. Nalahia-bay, Nusa-Laut-island. 46 m. Bottom stony. 1 ova-bearing female. Stat. 240. November 22 till December 1. Banda-anchorage. Reef. 7 mostly young specimens, 2 of which with eggs. Stat. 301. January 30 — February 1. io°38'S., I23°25'.2E. Pepela-bay, East coast of Rotti- island. Reef. 1 ova-bearing female. Accordino- to Dana A. pacijïctis attains a length of one and three-fourths inches (45 mm.), but the largest specimen, taken by the "Siboga", an ova-bearing female from Stat. 93, is hardly 35 mm. long. In this species the females are already ova-bearing at a very young age, so e. g. a female from Stat. 133. which is 15,5111111. long. In Dana's figure 50 the rostrum appears very short, hardly reaching beyond the orbital hoods ; as is shown, however, by the numerous specimens collected by the "Siboga", the length of the rostrum is rather variable. In the largest specimen from Stat. 93, like also in most other ones, the rostrum projects horizontally forward almost to the end of first antennular article, presenting the same form as in the figure 47 of Coutière's quoted paper; in a somewhat younger specimen from the same station the rostrum extends as far forward, but it is slightly turned upward and it appears much narrower at its base; in a young specimen, finally, 18 mm. long, from Stat. 133, the rostrum appears as short as in Dana's figure, but this is apparently an exception. The rostrum proper carries at either side a few. four or five, fine, rather short hairs, like in A. macrochirus Richters, though in A. macrochirus the hairs are longer and more numerous. The rostral carina is low, rounded above and separated from the orbital hoods by narrow grooves. A. o-racilidigitiis Miers is, no doubt, identical with this species. According to the measurements mentioned by Coutière, the fingers of the smah-chela should be, in A. pacipcus, a little shorter in proportion to the palm than they appear in the figure 32 of PI. XXV of my paper published in 1892 (1. c), but in the young male, long 20111111., from Ambon the proportion between the length of the chela and that of the fingers is 1,36, the fingers being almost 3-times as long as the palm and leaving an interspace between them when closed, whereas the palm appears but slightly longer than high. In the other specimens the small chela agrees with the measurements and figures published by Coutière. Alphe7is pacificus Dana, one of the few species of the Edwardsii group, in which the merus of the 3rd and 4th legs is unarmed and in which the dactylus of the smaller chela shows never the Balaeniceps-ioxm.. may easily'be recognized by the shape of the rostrum, of the orbital hoods, of the scaphocerite etc. Remarks. The species which has been described by Hilgendorf as A. pacifiats (in: Monatsber. Kön. Akad. Wiss. Berlin, 1878, p. 832) is a different form, in which the merus of the third leo-s is armed with a tooth and in which the infero-internal margin of the merus of the first pair of legs carries a spine. General d i s t r i b u t i o 11 : Red Sea (Coutière) ; Madagascar (Coutière) ; Maldives and Laccadives (Coutière); Fiji Islands, Totoya (Miers); Doublé Bay, New South Wales (Nobili); Campbell Island (Coutière); Sandwich Islands (Dana, Miers). 296 429 f65. Alpheus malabaricus (Fabr.) Henderson var. leptopus clc Man. Alpheus dolichodactylus Ortm. var. leptopus J. G. de Man, in: Tijdschr. d. Ned. Dierk. Vereen., (2) Dl. XI, 1910, p. 2S9. Confer: Alpheus malabaricus (J. C. Fabricius), J. R. Henderson, in: Trans. Linn. Soc. London Zool. Ser. 2, Vol. 5, 1893, p. 434, PI. XL, figs. 1 — 3. Alpheus dolichodactylus A. Ortmann, in: Zoolog. Jahrb. V. Abth. f. Syst. 1S90, p. 473, Taf. XXXVI, fig. 11." Alpheus dolichodactylus F. Doflein, in: Abhandl. k. bayer. Akad. Wiss. II Cl. XXI. Bd. III. Abth. 1902, p. 634. Stat. 12. March 14. 7°i5'S., ii5°i5'.6E. Bali Sea. 289 m. Mud and broken shells. 1 egg- bearing female. Stat. 19. March 19/21. 8°44'.5 S., n6°2'.5 E. Bay of Labuan Tring, West coast of Lombok. iS — 27 m. River-mud, coral, coralsand. 2 males and 1 ova-bearing female. Stat. 213. September 26 — October 26. Saleyer-anchorr.ge and Surroundings. 18 — 45 m. Mud and mud with sand. 1 mutilated specimen. Stat. 311. February 12/13. Sapeh-bay, East coast of Sumbawa. Depth up to 36 m. Mud and sand. 4 males. Alpheus dolichodaciyhis Ortm., of which three adult specimens, cotypes, from Sagami bay, Japan, that I received from the Museum at Strassburg, are lying before me, is no doubt identical with a species which in 1893 has been described by Henderson as the true A. malabaricus Fabr. This identity was already surmised in 1899 by Professor Coutière ("Les Alpheidae", p. 46 and 48). The basal tooth on the dactylus of the small chela occurs in the japanese specimens exactly as in Henderson's fïgure and the large chela also perfectly agrees with that figured by this author. In the largest of these specimens that is 34 mm. long, the larger chela is 18 mm. long, the fingers 7 mm., just as indicated by Henderson but there is no tracé of a tooth on the upper margin of the dactylus, which was supposed by this author to occur near the base of this finger, though it was not described by Dr. Ortmann. In the specimens from Japan the fingers are slightly gaping and this proves to be the only difference, for their form is the same as figured in the "Transactions"; this slight difference, however, may at most be regarded as a local feature, if it is indeed always present and, in this case, the species from Japan should be considered as a variety dolichodaciyhis Ortm. The specimens, collected by the "Siboga", now differ from those from Japan by their smaller size and by the thoracic legs being of a more slender shape. The adult egg-bearing female from Stat. 19 is 26 mm. long, the other specimens are of the same size or but a little shorter. Rostrum acute, almost as broad at its base as it is long, usually reaching to the middle of the visible part of first antennular article and projecting with half its length beyond the rounded and unarmed, orbital hoods, that are as prominent as in A. paralpheopsides\ in other specimens, as e. g. in the ova-bearing female from Stat. 19, the rostrum reaches only to the 2nd third of the visible part of basal article, hardly projecting- beyond the orbital hoods. In a specimen long 20 mm. from Stat. 311 the rostrum is wanting entirely, though the interorbital carina is well-developed : this is, apparently, an abnormal individual. Interorbital carina low, concealed in a lateral aspect by the orbital hoods, gradually widening a little backward and extending to the base of the orbital hoods from which it is separated by narrow, moderately deep grooves. 297 SIBOGA-EXPED1TIE XXXIX s1. 55 43° For the measurements of the telson I refer to Table A : it resembles that of the variety dolicho- dactylus. Posterior margin prominent, semicircular, the outer angles almost indistinct, spinules near the latter very short; spinules of the upper surface rather small, measuring in the male one-tenth, in the female one-twelfth the length of the telson. Second antennular article 2,5-times as long as thick, in the adult male from Stat. 311 almost one and a half as long as the visible part of first antennular article, in the adult female from Stat. 19 one-third longer than it; third article in the male one-sixth, in the female one- third shorter than the visible part of basal article. In the adult male, long 34 mm., of the variety from the Sagami bay the second antennular article is almost twice as long, viz. 1,9-times, as the visible part of the basal article, according to Ortmann's description. Stylocerite very broad with pointed extremity, a little shorter than first article. Spinule of the basicerite very small. Carpocerite extending with half the length of third article beyond the tip of the antennular peduncle; scaphocerite very broad, resembling that of A. Euphrosyne de Man, as long as the antennular peduncle, its outer margin nearly straight, terminal spine not or hardly extending beyond the rounded tip of the blade and reaching backward to the end of second antennular article or even not so far. The measurements of the ist — 3rd legs are indicated in the Tables B, C and D. The upper border of the merus of the larger cheliped terminates in a subacute tooth or lobe, infero- internal margin with a pointed spine at the apex. Large chela of the male. one and a half as long as the carapace, rostrum included, a little more than 3-times as long as high (broad), fingers a little more than half as long as the palm; both margins distinctly notched, groove on the outer face quadrangular, reaching backward to the middle of the palm, groove on the inner triangular; chela smooth and glabrous. Large chela of the female from Stat. 19 a little more slender than that of the male. Unfortunately the small cheliped is missing in all the male specimens, but the ova-bearing female from Stat. 1 9 is provided with it. The merus is one and a half times as slender as that of the larger leg, the infero-internal margin is unarmed, the upper margin truncate at its extremity. Chela as long as the carapace, fingers 3-times as long as the palm, slender, their inner margins shutting together and clothed with long hairs, the inner margins are unarmed. The second legs agree with those of the variety dolickodactylus, as is proved by the Table C. In the adult male from Stat. 311 the carpal segments are respectively long: 1,57 mm., 1,65 mm., 0,45 mm., 0,4 mm. and 0,56 mm.; chela 1,54 mm. long (palm 0,5 mm., fingers 1,04 mm.). In the male long 24 mm. from Stat. 19 the carpal segments measure 1,82 mm., 1,47111111., 0,4 mm., 0,36 mm. and 0,56 mm.; the chela is 1,58 mm. long (palm 0,56 mm., fingers 1,02 mm.). In the ova-bearing female from Stat. 19 the segments of the carpus are respectively long: 1,8 mm., 1,61 mm., 0,46 mm., 0,42 mm. and 0,6 mm. ; the chela is 1,68 mm. long, the palm 0,56 mm., the fingers 1,12 mm. In the adult typical male of the variety dolickodactylus from Japan the carpal segments measure: 2,66 mm., 2,24111111., 0,7111111., 0,63 mm. and 0,77111111.; the chela is 1,86 mm. long (palm 0,67 mm., fingers 1,19111111.). These numbers show that the 2nd segment of the rather slender carpus appears sometimes. 298 43i a little shorter, sometimes slightly longer than the ist, that the three following segments taken together are a little shorter than the 2nd, that the 4th is a little shorter than the 31'1, that the chela is about as long as the 2ml segment and that finally the fingers are twice as long as the palm. The following legs are more slender than those of the typical species. Ischium of 3rtl and 4th pair with a movable spine. Meri unarmed, those of the 3ld pair 7-times as long as wide; carpus half as long as the merus, propodus 1,6-times as long as the carpus, very slender, una r m e d like the carpus, its margins fringed with long setae, two or three of which at the distal extremity are hardly shorter than the dactylus; dactylus half as long as the propodus, lanceolate, flattened and carinate above. Table A. Proportion between the length of telson and the width of posterior margin . . Proportion between the width at base and that of posterior margin Proportion between the length of the telson and the distance of the anterior pair of spinules from the posterior margin Proportion between the distances of both pairs of spinules from the posterior margin N» 1. No 3. N» 4. N» 5. 3.2 1.55 1,8 2,25 2,96 3.25 3>3 1,65 1,6 h7 1,65 i,73 i.7 1,76 2,1 2,1 Table B. Proportion between length and width of the merus [ fingers Relative dimensions of ( total length height Proportion between length and height of the chela . Proportion between length and width of the merus . ( fingers Relative dimensions of { total length height of the larger cheliped of the smaller cheliped Proportion between length and height of the chela Table C. Proportion between length and width of the merus . I Proportion between length of the merus and that of of the 2°<1 legs the carpus ) N° 1. N'o 2. NO 3. No 4. NO 5. N» 6. 9 2,9 I 2,6 0,9 3 3,45 i i,32 0,23 5,7 N'o 1. N"o 2. N° 3. N'o 4. N» 5. 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Prodromus descriptionis animalium evertebratorum, quae in Expeditione ad Oceanum Pacificum Septentrionalem, a Republica Federata missa, CADWALADARO RlNGGOLD et JOHANNE RODGERS DUCIBUS, observavit et descripsit. Pars VIII. Crustacea Macrura, in: Proc. Acad. Nat. Sc. Philadelphia, 1860. THALLWITZ, J. Decapoden-Studien, insbesondere basirt auf A. B. MEYER's Sammlungen im ostindischen Archipel, nebst einer Aufzahlung der Decapoden und Stomatopoden des Dresdener Museums, mit 1 lith. Tafel, Berlin, 1891, in: Abhandl. u. Berichte des kon. Zool. und Anthropol.-Ethnogr. Museums zu Dresden 1890/91, N° 3. THOMSON, GEORGE M. On the New Zealand Phyllobranchiate Crustacea-Macrura, with 3 Pis., in: The Transactions of the Linnean Society of London. 2nd Ser. Zoology. Vol. VIII. Part 11. 1903. ZEHNTNER, L. Crustacés de 1'Archipel Malais. (Avec 3 Planches), in : Revue Suisse de Zoölogie et Annales du Musée d'Histoire Naturelle de Genève. Genève 1894. 327 INDEX. Note. Synonyms are printed in Italics. The more important pages are indicated by darker type. acanthitelsonis (Synalpheus) 186. I SS. 190. 196. 197. 202. 259. 264. 265. 267. 269. 288. 451. 453. acanthomerus (Alpheus) 437. 438. acanthomerus var. inermis (Alpheus) 436. aculeipes (Alpheus) 351. 352. 355. aculeipes var. tryphopus (Alpheus) 352. acutocarinatus (Alpheus) 303. 304. 306. 325. 401. 443. 446. 449. 455. acuto-femoratus (Alpheus) 300. 302. 305. 310. 337. 443. 450. Adamastor (Alpheus) 301. 305. 317. aequalis (Alpheopsis) 176 — 181. 184. aequalis var. truncatus (Alpheopsis) 176 — 178. 185. aequalis (Betaeus) 173. aequimanus (Betaeus) 173 — 176. aglaopheniae (Alpheus) 300. 305. 312.339. 341—343- Albatrossi (Synalpheus) 187. 1S9. 191. Alcyone (Alpheus) 299. 305. 314. 317. 351. 355. 443. 447. 449. 454. alphaerostris (Ogyris) 135. Alpheidae 133. Alpheinus 133. 134. Alpheoides 185. alpheopsides (Alpheus) 301. 306. 321. 380. 384. Alpheopsis 133. 134. 176. Alpheus 133. 134. 185. 299. 44i- 44-- 444—446. 45 !• amabilis (Aretopsis) 171. amabilis (Synalpheus) 190. 199. 275. 442. 453. amboinae (Alpheus) 203. amboinae (Synalpheus) 186. 189. 190. 203. 205. 442. 447- 453- 454- amboinensis (Arete) 162 — 164. Amirantei (Alpheus) 301. 304. 305. 310. Amphibetaeus 133. 134. 176. 183. anacanthopus (Automate) 139. 142. ancistrorhynchus (Synalpheus) 188. 190. 197. 202. 267. 453- Antenor (Synalpheus) 188. 190. 201. 294. 442. 451.453. architectus (Alpheus) 300. 302. 305. 311. Arete 133. 134. 162. 170. 171. areteformis (Athanas) 145. 146. 154. Arethusa (Alpheus) 305. 314. 352. 364 — 366. 410. 443- 454- Aretopsis 133. 134. 170. Athanas 133. 134. 144. 161. 172. Athanopsis 133. 134. 170. 171. 185. Audouini (Alpheus) 299. 306. 327. 329. 414. 423. 426. 443. 450—452. australis (Betaeus) 173. 176. Automate 133. 134. 138. baculifer (Alpheus) 301. 305. 314. Bakeri (Synalpheus) 187. 189. 195. 253. Bakeri var. Stormi (Synalpheus; 186. 189. 195. 253. barbatus (Alpheus) 300. 306. 323. 387. 443. 446. 450. 455. Bastardi (Alpheus) 301. 306. 327. 411. 412. 426. Betaeus 133. 134. 173. bicostatus (Alpheus) 303. 304. 306. 319. 375. 443. 444. 446. 449. 452. bidens (Alpheus) 300. 303. 304. 306. 3 18. 371. 373— 377- 443- 45°- 45'- 453- 454- bis-incisus (Alpheus) 301. 303. 306. 326. 405 — 407 bis-incisus var. Malensis (Alpheus) 301. 306. 326 405. 406. bis-incisus var. stylirostris (Alpheus) 301. 306. 329.406 bis-incisus var. variabilis (Alpheus) 306. 326. 406 415- 443- 448- bispinosus (Synalpheus) 190. 200. 280. 442. 446. 453 bituberculatus (Synalpheus) 188. 190. 200. 276. 289 290. 296. 441. 442. 448. 451—455. biunguiculatus (Alpheus) 188. 202. 273. 294. biunguiculatus (Synalpheus) 186. 188. 190. 199. 273 280. 281. 285 — 287. 297. 442. 447. 454. 328 461 biunguiculatus var. exilipes (Synalpheus) 187. 188. 190. 199. 276. 280. Borradailci (Arete) 163. 168. Bouvieri (Alpheus) 301. 306. 326. 411. 412. Bouvieri var. Hululensis (Alpheus) 301. 306. 329. 410. brachyceros (Synalpheus) 187. 190. 199. 202. 203. bradypus (Alpheus) 301. 305. 315. 316. brevicristatus (Alpheus) 301. 302. 306. 323. 385. brevipes (Alpheus) 301. 302. 305. 315. brevirostris (Alpheus) 301. 302. 306. 322. 385 — 387. brevirostris var. angustidigitus (Alpheus) 300. 302. 306. 322. 385. Brocki (Synalpheus) 257. bucephaloides (Alpheus) 301. 305. 315. bucephalus (Alpheus) 301. 302. 305. 316.356.359 — 362- carinatus (Alpheus) 210. carinatus (Synalpheus) 186. 189. 191. 202. 210. 441. 442. 446. 451. 454. 455. carinatus var. binongcensis (Synalpheus) 1S8. 189. 191. 211. 452. carinatus var. ubianensis (Synalpheus) 189. 191. 212. 441. 442. 449. 452. Chalciope (Alpheopsis) 176 — 179. Charon (Alpheus) 245. Charon (Synalpheus) 186. 189. 194. 245. 441. 452. Cheirothrix 133. 134. 180. chilensis (Alpheopsis) 176. 183. chiragricus (Alpheus) 300. 306. 328. 406. 407. 414. 415- 443- 446. 447- 449—451- 454- 455- clypeatus (Alpheus) 301. 302. 305. 317. 358—361. 366. 367. coetivensis (Alpheus) 301. 306. 320. collumianus (Alpheus) 299. 305. 309. 334.443.448 — 450. 452—454. Comatula 189. comatularum (Alpheus) 186. comatularum (Synalpheus) 186. 189. 190. consobrinus (Alpheopsis) 176 — 178. 180. consobrinus (Alpheus) 305. 315. 316. 360. 362. 443. 448—450. 452. 454. 455. consobrinus (Synalpheus) 188. 189. 191. 204. 209. 441. 442. 44S. 452. 454. 455. Coutierei (Alpheus) 303. 306. 326. 409. 443. 449. 454. crassimanus (Alpheus) 300. 306. 328. 417. 425. 443. 447—449- 45 t- 45 2- crinitus (Alpheus) 300. 305. 315. 357—359. cristata (Jousseaumea) 158. 159. cristatus (Alpheus) 300. 303. 306. 319. 375. Danae (Alpheus) 301. 305. 314. 347. dasycheles (Alpheus) 301. 304. 306. 320. Demani (Synalpheus) 186. 189. 195. 257. 442. 446. 451- 455- S1BOGA-EXPEDITIE XXXIX a'. deuteropus (Alpheus) 301. 305. 309. 336. diadema (Alpheus) 301. 302. 306. 319. 380. dimorphus (Athanas) 145. 147. 150. dimorphus var. monoceros (Athanas) 145. 147. distinguendus (Alpheus) 300. 306. 323 — 325. 385 — 387- 395- djeddensis (Alpheus) 301. 306. 323. 391 — 393. djiboutensis (Alpheus) 301. 306. 323. Ujiboutensis (Athanas) 145. 147. 152. 153. 155. dolichodactylus (Alpheus) 429. 431. dolichodactylus var. lep/opus (Alpkeus) 429. dolichognatha (Automate) 139 — 141. 144.. dorsalis (Arete) 162 — 165. 167. dorsalis var. pacificus (Arete) 167. edamensis (Alpheus) 300. 306. 331. 435 — 437- 443- 447—451- Edwardsii (Alpheus) 301. 306. 327. 411. 414 — 416. Edwardsii var. leviusculus (Alpheus) 411. Ehlersii (Alpheus) 300. 302. 306. 320. emarginatus (Betaeus) 173 euchiroides (Alpheus) 301. 302. 306. 331. euchirus (Alpheus) 300. 306. 331.423.424.434.438. 443- 446. 447- 453—45 5- Eulimene (Alpheus) 304. 305. 317. 364. 443. 451. Euphrosyne (Alpheus) 300. 306. 327. 413. 414. 430. Euryone (Alpheopsis) 176. 177. 184- Evermanni (Automate) 139. 144. facetus (Alpheus) 305. 311. 340. 443- 449- 453- falcatus (Synalpheus) 189. 190. fissipes (Alpheopsis) 176. 177. fossor (Synalpheus) 187 — 189. 195. 250. fossor var. propinqua (Synalpheus) 189. 195. 250. 442. 449. 451. 453—455- frontalis (Alpheus) 299. 305. 31S. 368. 369. 443- 446—450. 452—455. funafutensis (Alpheus) 300. 302. 306. 331. 436. Gardineri (Automate) 139— 141. 144. gracilidigitus (Alpheus) 427. 428. gracilipes (Alpheus) 299. 304. 306. 319. 320. 380. 443- 449—452- gracilirostris (Synalpheus) 188. 190. 198. 202. 269. 442. 454- gracilis (Alpheus) 301. 302. 305. 310. 337. 341. 342. gracilis var. Alluaudi (Alpheus) 301. 305. 312. 341. 342. gracilis var. luciparensis (Alpheus) 302. 305. 311. 337. 443. 452. Granti (Athanas) 145 — 147. 148. 154. Gravieri (Synalpheus) 186. 188. 189. 192. 214. 216. 219. 220. 222. 231. 442. 447. 451. 453—455. Grimaldii (Athanas) 145. 146. 329 59 462 Haanii (Alpheus) 301. 302. 306. 330. Haddoni (Synalpheus) 186. 190. Hailstonei (Alpheus) 301. 302. 305. 308. 331. 333. Hailstonei var. assimulans (Alpheus) 304. 305. 308. 331. 443. 453—455- Hailstonei var. laetabilis (Alpheus) 304. 305. 309. 333- 443- 444- 447- 45 1- 453—455- Halesii (Alpheus) 301. 302. 306. 324. Harfordi (Betaeus) 173. 182. Harrimani (Betaeus) 173. hastilicrassus (Synalpheus) 186. 188. 190. 196. 202. 263. 264. 266. 441. 442. 448. 451. 453. 454. hastilicrassus var. (Synalpheus) 188. 190. 196.264.455. Haswelli (Athanas) 145. 147. 151. Haugi (Alpheopsis) 133. 176. Helleri (Synalpheus) 186. 189. 194. 246. heroni (Synalpheus) 186. 189. 195. 256. 441. 442. 447- 443- hilarula (Jousseaumea) 158. 160. hilarulus (Synalpheus) 188. 190. 198. 202. 271. 441. 450. Hippothoë (Alpheus) 300. 306. 331.424.433—438. 443- 449- hippothoë var. (Alpheus) 434. Hippothoë var. edamensis (Alpheus) 436. 437. hoplites (Alpheus) 301. 302. 306. 330. 425. hoplocheles (Alpheus) 301. 306. 326. 419. 421. hululensis (Synalpheus) 187. 188. 190. 197. 202. 261. 262. 270 — 272. idiocarpus (Alpheopsis) 176. 177. 180. idiocheles (Alpheus) 301. 305. 312. indicus (Arete) 162 — 166. 172. indicus (Betaeus) 173. insignis (Alpheus) 299. 306. 319. 377. 380. 443. 448. Iocasta (Synalpheus) 187 — 189. 193. 235. 250. 442. 448—455. Iphianassa (Arete) 162 — 164. Iphinoë (Synalpheus) 188. 189. 192. 219. 222. 223. 442. 447. 453. 454. japonicus (Alpheus) 301. 302. 306. 327. jedanensis (Athanas) 145. 14S. 152. 154. jedanensis (Synalpheus) 189. 192. 222. 224. 225.453. Jousseaumea 133. 134. 158. kingsleyi (Alpheus) 323. laevigatus (Betaeus) 173. laevis (Alpheus) 339. Lanceloti (Alpheus) 301. 303. 306. 320. 378 — 380. Latastei (Synalpheus) 187. 190. 198. 202. laticeps (Synalpheus) 187. 188. 190. 201. 296. latifrons (Alpheus) 369. latirostris (Jousseaumea) 158. 159. 160. lepidus (Alpheus) 304. 306. 324. 397. 443. 447. 449. leptochiroides (Alpheus) 304. 306. 328. 421. 443. 453. leptochirus (Alpheus) 301. 306. 328. 422. leviusculus (Alpheus) 300. 306. 327. 411. 443. 453. lineifer (Alpheus) 432. 433. lobidens (Alpheus) 301. 302. 306. 328. 417. 418. 425. longecarinatus (Alpheus). 301. 303. 305. 315. longidactylus (Betaeus) 173. lophodactylus (Synalpheus) 187. 190. 199. Lutini (Alpheus) 299. 302. 305. 313.346.350.443.450. Mac-Cullochi (Synalpheus) 187. 190. 198. 202. 271. macrochirus (Alpheus) 299. 301. 305. 312. 343. 428. 443- 447- 448- 452. macrodactylus (Alpheus) 300. 306. 330. 414. macrosceles (Alpheus) 300. 303. 304.306.325.401 — 403- 443- 444- 446. Maindroni (Alpheus) 301. 306. 329. malabaricus (Alpheus) 301. 306. 323. 330. 385.429.432. malabaricus var. dolichodactylus (Alpheus) 301.302. 306. 330. 430. 432. malabaricus var. leptopus (Alpheus) 304. 306. 330. 429. 443- 445- 446. 452. 455- Malhaensis (Alpheus) 301. 305. 309. malleodigitus (Alpheus) 300. 305. 313.347.443.449. 450. 452. malleodigitus var. gracilicarpus (Alpheus) 305. 313. 349. 444- 448. 449- 454- malleodigitus (Betaeus) 347. maruteensis (Arete) 162 — 164. 170. marutëensis var. Salibabuensis (Arete) 164. 169. merospiniger (Synalpheus) 187 — 1S9. 201. Metabetaeus 133. 134. microrhynchus (Alpheus) 300. 306. 327. 413. 444. 446. 448. microstylus (Alpheus) 300. 305. 312. 344 — 346. 350. 444- 450. microstylus var. (Alpheus) 305. 313. 345. 444. 447- microstylus (Betaeus) 344. Miersi (Alpheus) 299. 306. 324. 379. 3S0. 390. 393. 444. 446. 44S. 449. 453. Minikoensis (x\thanas) 145. 147. 149. minor (Alpheus) 330. minor var. neptunus (Alpheus) 212. 213. miscellaneus (Synalpheus) 189. 192. 224. 442. 454. mitis (Alpheus) 300. 306. 321. modestus (Synalpheus) 189. 193. 232. 441. 453. monoceros (Alpheus) 147. mushaensis (Synalpheus) 187. 190. 198. 202. Naifaroensis (Athanas) 145. 146. 148. neomeris (Alpheus) 212. 226. 229. neomeris (Synalpheus) 186. 188. 189. 192. 212. 224 — 229. 231. 247—249. 442. 449. 451. 453—455- 46' neomeris var. streptodactylus (Synalpheus) 226. neomeris var. Pococki (Synalpheus) 234. neptunus (Alpheus) 291. neptunus (Synalpheus) 186. 188. 190. 201. 214. 291. 293. 294. 299. 442. 447. 450. 451. 454. Nilandensis (Synalpheus) 186. 1S8. 189. 194. 246. 442. 447. 453. Nilandensis var. bandaensis (Synalpheus) 188. 189. 194. 247. 248. 249. 442. 447. 453. Nilandensis var. oxyceros (Synalpheus) 186. 1S8. 189. 194. 249. 442. 454- nitescens (Athanas) 144 — 146. novae-zelandiae (Alpheus) 301. 302. 306. 320. obeso-manus (Alpheus) 301. 302. 305. 312.344.345. obeso-manus var. japonicus (Alpheus) 301. 302. 305. 313- occidentalis (Ogyris) 135 — 137. odontophorus (Synalpheus) 187 — 189. 191.208. 447. 453- 454- Ogyris 133—135- orientalis (Athanas) 145. 147. orientalis (Ogyris) 135. Ortmanni (Jousseaumea) 158. otiosus (Synalpheus) 187. 1S9. 193. ovaliceps (Alpheus) 301. 305. 318. 353. 368. pachychirus (Alpheus) 299. 305. 318. 366. 444. 449. 450. 455- pachymeris (Synalpheus) 187. 188. 190. 199. 268. 273- 277 — 279- 284- 289- 29K 296- pacificus (Alpheus) 299. 306. 329. 427. 444. 446. 447- 449—454- Parabetaeus 133. 134. 176. 177. 1S4. 185. parabrevipes (Alpheus) 302. 2>Z7- paracrinitus (Alpheus) 301. 306. 320. 321. 383. 384, paracrinitus var. bengalensis (Alpheus) 301.306.320 321. 380. 3S5. 384. paraculeipes (Alpheus) 300. 305. 315. 316. 356.364 444. 454. paradentipes (Alpheus) 300. 305. 309. 336.444.454 paragracilis (Alpheus) 300. 302. 305. 310. paralcyone (Alpheus) 300. 304. 305. 314. 354. 444 446—455- paralpheopsides (Alpheus) 301. 306. 321. 380. 381 383. 384. 429. paraneomeris (Synalpheus) 187-189. 193.240.241.283 paraneomeris var. halmaherensis (Synalpheus) 189 193. 240—243. 441- 450- paraneomeris var. praedabundus (Synalpheus) 189 193. 240. 441- 446- 450. 453- paraneomeris var. prolatus (Synalpheus) 186. 189 193. 241. 243. 441. 450. 452. Parathanas 133. 134. pareuchirus (Alpheus) 300. 304. 306. 326. 328. 331. 407—409. 418. 422- 444- 447- 449- 45 '• 453- 454- pareuchirus var. imitatrix (Alpheus) 303. 304. 306. 329- 426- 444- 45'- 455- pareuchirus var. Leucothea (Alpheus) 304. 306. 328. 420. 426- 427- 444- 446—449- parvi-rostris (Alpheus) 299. 306. 330. 411. 432. 439. 440. 444. 446—450. 432. 453. parvus (Alpheus) 305. 315. 316. 358. 444- 450. parvus (Athanas) 145. 147. 148. Paulsoni (Synalpheus) 1S7. 190. 197. 202. 269. 271. 273. Paulsoni var. Kurracheensis (Synalpheus) 187. 190. 197. 273. Paulsoni var. liminaris (Synalpheus) 1S7. 190. 197. 271. 273. Paulsoni var. Rameswarensis (Synalpheus) 187. 190. 197. 269. 271. 273. Paulsoni Senegambiensis (Synalpheus) 273. Percyi (Alpheus) 30 r. 304. 306. 319. Perezi (Alpheus) 301. 306. 331. persicus (Alpheus) 301. 305. 313. 347. 348. Pescadorensis (Synalpheus) 186. 188. 190. 201. 277. 298. 442- 449- 454- Philoctetes (Alpheus) 303. 306. 319. 378. 444- 453- phrygianus (Alpheus) 301. 305. 313. 347. 348. physocheles (Synalpheus) 187. 189. 194. Pococki (Synalpheus) 186. 1S7. 189. 193. 234.236— 238. 240. 453. Polyxo (Alpheus) 303. 306. 329. 423. 444- 453- praedator (Alpheus) 303. 306. 319. 373. 375. 444. 45 i- prolificus (Alpheus) 216. prolificus (Synalpheus) 203. 219. proseuchirus (Alpheus) 303. 304. 306. 326. 407. 444- 449- Providencei (Alpheus) 301. 304. 305. 314. Pterocaris 133. 134. pubescens (Alpheus) 306. 323. 389. 392. 393. 444. 447. 448. 451. 453. 454. pugnax (Alpheus) 301. 302. 306. 320. quadridens (Synalpheus) 190. 200. 284. 442. 454. quadrispinosus (Synalpheus) 188. 190. 200. 2S4. 285. 442. 447. 45 ï - 453- 455- Racilius 133. 134. rapacida (Alpheus) 306. 324. 394. 397. 398. 444. 450. 454- 455- rapax (Alpheus) 300. 301. 303. 306. 322. 324. 325. 385. 3*6. 395—397- 444- 452- rapax var. Miersi (Alpheus) 393. Rouxi (Alpheus) 340. rugosa (Automate) 139. 140. 144. Salomoni (Automate) 139. 140. 144- 33i 464 v 'V savuensis (Alpheus) 306. 324. 392. 444. 446. 447. scabrodigitus (Betaeus) 173. septemspinosus (Synalpheus) 188. 190.200.277.289. 442. 455. serratidigitus (Jousseaumea) 158 — 160. Seurati (Alpheus) 300. 302. 305. 309. Shearmei (Alpheus) 301. 304. 305. 311. Sibogae (Alpheopsis) 176. 177. 181. Sibogae (Alpheus) 304. 306. 325. 398. 444.447.455. Sibogae (Athanas) 145. 148. 149. 151. Sibogae (Jousseaumea) 158. 160. 161. Sibogae (Ogyris) 135. sinuosus (Betaeus) 173. Sladeni (Synalpheus) 187. 190. socialis (Alpheus) 301. 302. 305. 3 II. 344. 388.389. Solenocaulon 189. sp. (Alpheus) 253 sp. (Alpheus) 269 sp. (Alpheus) 301 sp. (Alpheus) 305 sp. (Alpheus) 304 sp. (Alpheus) 306 sp. (Automate) 140. spiniger (Alpheus) 202. splendidus (Alpheus) 301. 302. 305. 311. 341. 343. spongiarum (Alpheus) 299. 304. 305. 316. 362. 444. 445. 449. 450- 453- 455- Stanleyi (Alpheus) 301. 305. 318. 367. 368. Stanleyi var. dearmatus (Alpheus) 302. 305. 318. 367. 444- 45°. 453- staphylinus (Alpheus) 301. 305. 308. Stimpsoni (Synalpheus) 186. 189. 191. 204 — 208. Stimpsoni var. Maldivensis (Synalpheus) 187. 189. 191. strenuus (Alpheus) 299. 303. 306. 329. 425. 427. 444. 447- 449- 45i — 453- strenuus var. angulatus (Alpheus) 301. 306. 329. streptodactyloides (Synalpheus) 189. 192. 230. 442. 454- streptodactylus (Synalpheus) 186. 188. 189. 192.213. 226. 231-234.236. 237.441.442.446-448.450-455. 305- 314. 349. 448. 306. 322. 383. 447- 439- 446. styliceps (Alpheus) 301. 303. 305. 317. 35- — 354- 364- 365- superciliaris (Alpheus) 301. 305. 317. 364. 368. Synalpheus 133. 134. 171. 172. 185. 299. 441. 442. 446. Talismani (Alpheus) 402. Talismani (Automate) 139. 140. 144. tenuicarpus (Alpheus) 303. 304. 306. 321. 381. 383. 444. 449. 455. tenuipes (Alpheus) 303. 304. 306. 322. 383. 444.452. tenuipes (Athanas) 146. 157. Theano (Synalpheus) 190. 201. 293. 451. Theophane (Synalpheus) 188. 190. 196. 202. 259. 261. 441. 442. 448. 450. 454. triacanthus (Synalpheus) 188 — 190. 200. 282. 288. 454. tricuspidatus (Synalpheus) 1S7. 190. 202. tridentatus (Alpheus) 371. trigona (Jousseaumea) 158. trionyx (Synalpheus) 187. 189. 195. trispinosus (Alpheopsis) 176. 177. 179 — 181. 183. trispinosus (Synalpheus) 188. 190. 200. 282 — 284. 288. 447- triunguiculatus (Alpheus) 257. triunguiculatus (Synalpheus) 187. 1S9. 194. truncatus (Betaeus) 173. tryphopus (Alpheus) 301. 302. 305. 317. tumidomanus (Alpheus) 258. tumidomanus (Synalpheus) 186. 188. 190. 196. 202. 258. 261. 262. 272. 441. 442. 452. 454. tumidomanus var. exilimanus (Synalpheus) 202. tumidomanus var. gracilimanus (Synalpheus) 202. utricola (Betaeus) 370. veloculus (Athanas) 145. 146. ventrosus (Alpheus) 299. 305. 311. 339. 444. 448. 450. 452—454. villosus (Alpheus) 300. 305. 310. 465 ADDENDA ET CORRIGENDA. Page 174, line 4, for "slightlye marginate" read "slightly emarginate". ine 13, for "Saleyer" read "Tanah Djampeah". ine 16 from bottom, for "1877" read "1880". ine 16 from bottom, for "1898" read "1908".. ine 9 from bottom, for "1898, p. 166." read "1898, N° 7, p. 166". Page 418, line 10 from bottom, for "April 27/28" read "February 2/5". Pages 276, 352, 355 and 389. The specimens of Syn. tuberculatus de Man, A. Arethusa de Man, A. paral- cyone Cout. and A. pubescens de Man, which are enumerated as having been collected at Stat. 60, are not from this Station, but from Stat. 303, having been dredged February 2/5 on a Lithothamnion bottom in about 10 m. depth at Haingsisi, Samau-Island near Timor. Page 333, Page 340, Page 389, 1 Page 393. ! te* In Part I Family Penaeidae Penaeus Bocagei Johnson has been omitted and should be inserted in the List at page 10 as: " Penaeus Bocagei Johnson 1863. Coast of Portugal". This species, which bears the vulgar name of Camarao da costa and which abundantly occurs on the coast of Portugal, belongs according to Professor COUTIÈRE to the edible species of Crustacea and is actively fished (H. COUTIÈRE, in: Buil. Soc. Nat. d'Acclimatation de France, Paris 1909). My contention at page 95 of Part I that, besides P. caramote, only two other species of Penaeus occur in the Atlantic, is therefore erroneous, three species beina: found there besides RlSSO's Penaeus. 333 ■ RÉSULTATS DES EXPLORATIONS ZOOLOGIQUES. BOTANIQUES, OCÉANOGRAPHIQUES ET GÉOLOGIQUES ENTREPEI3E3 AUX raDKS NKERI.ANDAISKS ORIENTAI.E3 CQ 1899 — 1900, a bord du 8IBOÖA SOUS I.E COMMANDEMENT DE G. F. TYDEMAN PUBLIÉS PAR MAX WICBKR Chef de 1'eipédition. *I. Introductie-d et descriptiou de l'eïpédition, Max We bei'. *II. Lc bateau et sou équipement scientifique, G. F. Tyde :n ■ a. *1U. Re'sultats bydrograpliiqueg, G. F. Tydeman, IV. Koramiiiilcru, F. \V. Winter. •IYdii. Xenophyophura, F. E. Sc huize. V. Rsdjolaris, M. 11 artinaim. • VI. Porifera, G. O. J. Vosmacr et I. Ijima '). Vil. Hydropolypi, A. liillard. *VI1I. Sryiasteriiia, S. -I. Hicksou et M»e II. M. England. *IX. Siphonophora, Milis Lens et van Riemsdijk. *X. Ilvdrouiedusae, O. Maas. *XI. Scyphotnedusae, O. Maas. *X1I. Ctenophora, MUe F. Moser. * XIII. Gorgonidae, Alcyonidae, .1. Versluvs, S. .T. Hickson, [O. C. Nuttin- et J. A. Thomson '). XIV. Peunalulidae, S. J. Hickson. •XV. Actiuiaria, P. Mc Murrich')- *XV1. Madieporaria, A. Alcock et L. Döderlein1). XVII. Antipatharia, A. J. van Pescb. XVIII. Turbellaria, L. von Graff et It. R. von Stummer. XIX. Cestodes, J. W. Spengel. • XX. Nematomorplia, II. F. Nierstrasz. •XXI. Chactognatha, G. II. Fowler. XXII. Nemertiui, A. A. W. Kubrecht. XXIII. Myzoetomidae, R. R. von Stummer. XXIV'. Polychaeta errantia, R. Horst. XXIV*. Polychaeta sedentaria, M. Caullery et F. Mcsnil. *XXV. Gepbyrea, C. Pb. Sluiter. •XXVI. Enteropneusta, J. W. Spengel. • XXVWw. Ftcrobrancbia, S. F. H arm er. XXVII. Brachiopoda, J. F. van Hemmelen. XXVI II. Polyzoa, S. F. Harmer. *XXIX. Copepoda, A. Scott'). *XXX. Ostracuda, G. W. Muller. «XXXI. Cirrbipedia, P. P. C. Hoek'). XXXII. Isopoda, H. F. Ni erstrasz. XXX III. Amphipoda, Ch. Pérez. •XXXIV. Caprellidae, P. Mayer. XXXV. Stomatopoda, H. J. Hausen. •XXXVI. Cumacea, W. T. Calman. • XXXVII. Schizopoda, H. J. Hanseu. XXXVIII. Sergestidae, H. J. Hansen. • XXXIX. Decapoda, J. G. de Man et J. E. W. Ihle "). *XL. Pantopoda, J. C. C. Loman. XLI. Halobatidae, J. Th. Oudemans. •XLH. Crinoidea, L. Döderlein et Austin H. Clark1). *XLHI. Echinoidea, J. C. H. de Meijere. *XLIV. Holothurioidea, C. Ph. Sluiter. *XLV. Ophiuroidea, R. Kohier. XLVI. Asteroidea, L. Döderlein. *XLVII. Solenogastres, H. F. Nierstrasz. • XLVin. Chitonïdae, H. F. Nierstrasz. *XLIX'. Prosobrauchia, M. M. Schepman1). *XLIX-. Prosobranchia parasitica, H. F. Nierstrasz et M. M. *L. Opisthobianchia, R. Bergh. [Schepman. •LI. Heteropoda, J. J. Tesch. *LII. Pteropoda, J. J. Tesch. LUI. Lamellibranchiata. P. Pel3eneer et Ph. Dautzenberg. *LIV. Scaphopoda, M"e M. Boissevain. LV. Cephalopoda, L. Joubin. •LVI. Tunicata, C. Ph. Sluiter et J. E. W. Ihle. LV1I. Pisces, Max Weber. LVIII. Cctacea, Max Weber. LIX. Liste des algues, Mme A. Weber. *LX. Halimeda, MUe E. S. Barton. (Mme E. S. Gepp). *LXI. Corallinaceae, M'ue A. Weber et M. F os 1 ie. •LXII. Codiaceae, A. et Mme E. S. Gepp. LXIII. Dinoflagellata. Coccosphaeridae, J. P. L o t s y. LXIV. Diatomaceac, J. P. Lotsy. LXV. Deposita marina, O. B. Böggild. LXVI. Résultats géologiques, A. Wichmann. Siboga-Expeditie THE DECAPODA OF THE SIBOGA EXPEDITION PART II Family ALPHEID AE DR. J. G. DE MAN Ierseke (Holland) Monographie XXXIX^1 of: UITKOMSTEN OP ZOOLOGISCH, BOTANISCH, OGEANOGRAPHISGH EN GEOLOGISCH GEBIED verzameld in Neder landsch Oost-Indië 1899 — 1900 aan boord H. M. Siboga onder commando van Luitenant ter zee ie kl. G. F. TYDEMAN UITGEGEVEN DOOR Dr. MAX WEBER Prof. in Amsterdam, Leider der Expeditie (met medewerking van de Maatschappij ter bevordering van het Natuurkundig Onderzoek der Nederlandsche Koloniën) BOEKHANDEL EN DRUKKERIJ «DUllBI E. J. BRILL LEIDEN m at^y \®JA&0 .fff? Qjjp 9£i.;%£' n _ .1 urn ;_ Publié Décembre 1911 * Les numéros avec un astérique out déja paru ceux marqués 1) seulement en partie Voor de uitgave van de resultaten der Siboga-Expeditie hebben bijdragen beschikbaar gesteld: De Maatschappij ter bevordering van het Natuurkundig Onderzoek der Nederlandsche Koloniën. Het Ministerie van Koloniën. Het Ministerie van Binnenlandsche Zaken. Het Koninklijk Zoologisch Genootschap > Natura Artis Magistra" te Amsterdam. De >Oostersche Handel en Reederij" te Amsterdam. De Heer B. H. de Waal Oud-Consul-Generaal der Nederlanden te Kaapstad. M. B. te Amsterdam. The Elizabeth Thompson Science Fund. CONDITIONS GÉNÉRALES DE VENTE. i°. L'ouvrage du „Siboga" se composera d'une série de monographies. 2°. Ces monographies paraitront au fur et a mesure qu'elles seront prêtes. 3°. Le prix de chaque monographie sera différent, mais nous avons adopté comme base générale du prix de vente: pour une feuille d'impression sans fig. flor. 0.15; pour une feuille avec fig. flor. 0.20 a 0.25; pour une planche noire flor. O.25; pour une planche coloriée flor. 0.40; pour une photogravure flor. 0.60. 40. Il y aura deux modes de souscription : a. La souscription a l'ouvrage complet. b. La souscription a des monographies séparées en nombre restreint. Dans ce dernier cas, le prix des monographies sera majoré de 25 °/0. 50. L'ouvrage sera réuni en volumes avec titres et index. Les souscripteurs a l'ouvrage complet recevront ces titres et index, au fur et a mesure que chaque volume sera complet. Déia paru: „ Prix: ** * Souscription Monographies a 1'ouvrage complet séparées ie Livr. (Monogr. XLIV) C. Ph. Sluiter. Die Holothurien der Siboga-Expedition. Mit ioTafeln. / 6. — ƒ 7.50 2e Livr. (Monogr. LX) E. S. Barton. The genus Halimeda. With 4 plates „ 1.80 „ 2.40 3e Livr. (Monogr. I) Max Weber. Introduction et description de 1'expédition. Avec Liste des Stations et 2 cartes „ 6.75 „ 9. — 4e Livr. (Monogr. II) G. F. Tydeman. Description of the ship and appliances used for scientific exploration. With 3 plates and illustrations „ 2. — ■ „ 2.50 5e Livr. (Monogr. XLVII) H. F. Nierstrasz. The Solenogastres of the Siboga-Exp. With 6 plates. „ 3.90 „ 4.90 6« Livr. (Monogr. XIII) J. Versluys. Die Gorgoniden der Siboga-Expedition. I. Die Chrysogorgiidae. Mit 170 Figuren im Text „ 3. — „ 3.75 7e Livr. (Monogr. XVI a) A. Alcock. Report on the Deep-Sea Madreporaria of the Siboga- Expedition. With 5 plates „ 4.60 „ 5.75 8e Livr. (Monogr. XXV) C. Ph. Sluiter. Die Sipunculiden und Echiuriden der Siboga-Exp. Mit 4 Tafeln und 3 Figuren im Text „ 3. — „ 3.75 9e Livr. (Monogr. Vla) G. C. J. Vosmaer and J. H. Vemhout. The Porifera of the Siboga- Expedition. I. The genus Placospongia. With 5 plates „ 2.40 „ 3. — I0e Livr. (Monogr. XI) Otto Maas. Die Scyphomedusen der Siboga-Expedition. Mit 12 Tafeln. „ 7.50 „ 9.50 ne Livr. (Monogr. XII) Fanny Moser. Die Ctenophoren der Siboga-Expedition. Mit 4 Tafeln. „ 2.80 „ 3.50 12e Livr. (Monogr. XXXIV) P. Mayer. Die Caprellidae der Siboga-Expedition. Mit 10 Tafeln. „ 7.80 „ 9.75 13e Livr. (Monogr. III) G. F. Tydeman. Hydrographic results of the Siboga-Expedition. With 24 charts and plans and 3 charts of depths „ 9. — „ 11.25 14e Livr. (Monogr. XLIII) J. C. H. de Meijere. Die Echinoidea der Siboga-Exp. Mit 23 Tafeln. „ 15. — „ 1S.75 15e Livr. (Monogr. XLVa) René Koehler. Ophiures de 1'Expédition du Siboga. ie Partie. Ophiures de Mer profonde. Avec 36 Planches „ 16.50 „ 20.50 i6e Livr. (Monogr. Lil) J. J. Tesch. The Thecosomata and Gymnosomata of the Siboga- Expedition. With 6 plates „ 3.75 „ 4.70 17e Livr. (Monogr. LVIrt) C. Ph. Sluiter. Die Tunicaten der Siboga-Expedition. I. Abteilung. Die socialen und holosomen Ascidiem Mit 15 Tafeln „ 6.75 „ 9. — l8e Livr. (Monogr. LXI) A. Weber— van Bosse and M. Foslie. The Corallinaceae of the Siboga- Expedition. With 16 plates and 34 textfigures „ 12.50 „ 15.50 19e Livr. (Monogr. VIII) Sydney J. Hickson and Helen M. England. The Stylasterina of the Siboga Expedition. With 3 plates „ 1.50 v 1.90 20e Livr. (Monogr. XLVIII) H. F. Nierstrasz. Die Chitonen der Siboga-Exp. Mit 8 Tafeln. „ 5. — „ 6.25 2 ie Livr. (Monogr. XLVè) René Koehler. Ophiures de 1'Expédition du Siboga. 2e Partie. Ophiures littorales. Avec 18 Planches „ 10.25 „ 12.75 22e Livr. (Monogr. XXVlèis) Sidney F. Harmer. The Pterobranchia of the Siboga-Expedition, with an account of other species. With 14 plates and 2 text-figures „ 6.75 „ 9. — 23e Livr. (Monogr. XXXVI) W. T. Calman. The Cumacea of the Siboga Expedition. With 2 plates and 4 text-figures „ 1.80 „ 2.40 24e Livr. (Monogr.. LVIrt) C. Ph. Sluiter. Die Tunicaten der Siboga-Expedition. Supplement zu der I. Abteilung. Die socialen und holosomen Ascidien. Mit 1 Tafel. „ — .75 , 1. — 25e Livr. (Monogr. L) Rud. Bergh. Die Opisthobranchiata der Siboga-Exped. Mit 20 Tafeln. „ 11.25 „ 14.10 26e Livr. (Monogr. X) Otto Maas. Die Craspedoten Medusen der Siboga-Exp. Mit 14 Tafeln. „ 9.25 B 12.50 27e Livr. (Monogr. XIII a) J. Versluys. Die Gorgoniden der Siboga-Expedition. II. Die Primnoidae. Mit 10 Tafeln, 178 Figuren im Text und einer Karte . . . „ 12.50 „ 16.75 28e Livr. (Monogr. XXI) G. Herbert Fowler. The Chaetognatha of the Siboga Expedition. With 3 plates and 6 charts „ 4.20 „ 5.25 29e Livr. (Monogr. LI) J. J. Tesch. Die Heteropoden der Siboga-Expedition. Mit 14 Tafeln. „ 6.75 „ 9.— Prix : Souscription Monographies a 1'ouvrage complet séparées 30e Livr. (Monogr. XXX) G. W. Muller. Die Ostracoden der Siboga-Exped. Mit 9 Tafeln. ƒ 3.50 ƒ 4.40 31e Livr. (Monogr. lVbis) Franz Eilhard Schulze. Die Xenophyophoren der Siboga-Exped^ Mit 3 Tafeln , 2.40 „ 3.— 32e Livr. (Monogr. LIV) Maria Boissevain. The Scaphopoda of the Siboga Expedition. With 6 plates and 39 textfigures „ 4.80 „ 6. — 33e Livr. (Monogr. XXVI) J. W. Spengel. Studiën über die Enteropneusten der Siboga-Exp. Mit 17 Tafeln und 20 Figuren im Text „ 14. — „ 17.50 34e Livr. (Monogr. XX) H. F. Nierstrasz. Die Nematomorpha der Siboga-Exp. Mit 3 Tafeln. „ 2.80 „ 3.50 35e Livr. (Monogr. XHIr) Sydney J. Hickson und J. Versluys. Die Alcyoniden der Siboga- Exped. I. Coralliidae, II. Pseudocladochonus Hicksoni. Mit 3 Tafeln und 16 Figuren im Text. v 2.20 „ 2.75 36e Livr. (Monogr. XXXItf) P. P. C. Hoek. The Cirripedia of the Siboga Expedition. A. Cirripedia pedunculata. With 10 plates „ 5.40 „ 6.75 37e Livr. (Monogr. XlAla) L. DÖderlein. Die gestielten Crinoiden der Siboga-Expedition. Mit 23 Tafeln und 12 Figuren im Text „ 8.— „ 10. — 38e Livr. (Monogr. IX) Albertine D. Lens and Thea van Riemsdijk. The Siphonophores of the Siboga Expedition. With 24 plates and 52 textfigures „ 13.50 „ 16.75 39e Livr. (Monogr. XLIX'«) M. M. Schepman. The Prosobranchia of the Siboga Expedition. Part I. Rhipidoglossa and Docoglossa, with an Appendix by Prof. R. BERGH. With 9 plates and 3 textfigures „ 4.80 „ 6. — 40e Livr. (Monogr. XL) J. C. C. Loman. Die Pantopoden der Siboga-Expedition. Mit 15 Tafeln und 4 Figuren im Text B 6.25 „ 7.80 41e Livr. (Monogr. LVIr) J. E. W. Ihle. Die Appendicularien der Siboga-Expedition. Mit 4 Tafeln und 10 Figuren im Text „ 4.80 „ 6. — 42e Livr. (Monogr. XLIX2) M. M. Schepman und H. F. Nierstrasz. Parasitische Proso- branchier der Siboga-Expedition. Mit 2 Tafeln „ 1.20 „ 1.50 43e Livr. (Monogr. XLIX'b) M. M. Schepman. The Prosobranchia of the Siboga Expedition. Part II. Taenioglossa and Ptenoglossa. With 7 plates „ 4.50 „ 5.60 44e Livr. (Monogr. XXIX a) Andrew Scott. The Copepoda of the Siboga Expedition. Part I. Free-swimming, Littoral and Semi-parasitic Copepoda. With 69 plates. . „ 26. — „ 32.50 45e Livr. (Monogr. LVI£) C. Ph. Sluiter. Die Tunicaten der Siboga-Expedition. II. Abteilung. Die Merosomen Ascidien. Mit 8 Tafeln und 2 Figuren im Text. „ 5.75 „ 7.25 46e Livr. (Monogr. XLIX'c) M. M. Schepman. The Prosobranchia of the Siboga Expedition. Part III. Gymnoglossa. With 1 plate „ — .80 „ 1.- — 47e Livr. (Monogr. XIII b) C. C. Nutting. The Gorgonacea of the Siboga Expedition. III. The Muriceidae. With 22 plates „ 8.50 „ 10.75 48e Livr. (Monogr. XIII£') C. C. Nutting. The Gorgonacea of the Siboga Expedition. IV. The Plexauridae. With 4 plates „ 1.60 „ 2. — 49e Livr. (Monogr. LVId) J. E. W. Ihle. Die Thaliaceen (einschliesslich Pyrosomen) der Siboga^ïxpedition. Mit 1 Tafel und 6 Figuren im Text „ 1.75 „ 2.20 50e Livr. (Monogr. XIII b2) C. C. Nutting. The Gorgonacea of the Siboga Expedition. V. The Isidae. With 6 plates B 2.25 „ 3. — 51e Livr. (Monogr. XXXVII) H. J. Hansen. The Schizopoda of the Siboga Expedition. With 16 plates and 3 text figures n I2-75 » 16. — 52e Livr. (Monogr. Xlllb3) C. C. Nutting. The Gorgonacea of the Siboga Expedition. VI. The Gorgonellidse. With 11 plates - . . „ 4. — „ 5. — 53e Livr. (Monogr. XV a) J. Playfair Mc Murrich. The Actiniaria of the Siboga Expedition. Part I. Ceriantharia. With 1 plate and 14 text figures „ 2.20 „ 2.75 54e Livr. (Monogr. XIII