lymnmim^m] '■'-^■■Mmmm'u ^;m " ■'■■«>*; ■.«<**' '«^. k*»" ^J ^^t!^ '^t?- m •••s a»»i -..^K- 'j's3;r :«^ ►«»»?• f\^'fl 334 Of sciences PROCEEDINGS OF THE AMERICAN ACADEMY OF ARTS AND SCIENCES. VOL. II. FROM MAV, 1S4S, TO MAY, 1832. SELECTED FROM THE EECORDS. ^ BOSTON AND CAMBRIDGE: METCALF AND COMPANY, 1852. PROCEEDINGS OF THE AMERICAN ACADEMY OF ARTS AND SCIENCES, SELECTED FROM THE RECORDS. VOL. II. Three hundred and eighth meeting. May 30, 184S. — Annual Meeting. The Vice-President, Mr. Everett, in the chak. The Reports of the Treasurer, and of the Auditing Commit- tee, were read by Mr. Peirce, in the absence of the Treasurer. Professor Gray, from the Committee of Publication, stated that there were various papers ready for publication, and that the materials at the disposal of the Committee were likely to be sufficient to furnish a volume of the Memoirs annually. He also communicated a paper from Dr. John L. Le Conte, of New York, giving an account of a new fossil pachyderm, the Platygonus compressus, found at Galena, Iowa. Mr. Bond communicated the following "Observations on Mauvais's Cobiet of July 4th, 1817, Made at the Cambridge Observatory. (Continued from Vol. I., p. 1G9, of the Proceedings.) Uambriclge (Juiiiel's Siar ol Comparison. .N 0. of 1 Mean Solar Time. A. R. 1 Dec. N. A. R. Dec. N. Com p. 1 If^S. d. h. m. s. h. III. So//; h. m. s. 1 Feb. 29 12 43 5-5 10 57 23,1 18 42 48 10 56 16.84 18 43 11.5 11 IB. Z. 456. March 1 15 22 00 10 54 37.8 18 36 57 10 56 16.84 18 43 11.5 12 " " 1 16 37 00 10 54 30.218 36 46 10 58 40.53 18 33 34.2 2 11 » 24 9 55 30 10 07 23.0 16 03 44 10 07 46.79 16 09 03.0 12 B. Z. 280. April 21 "9 09 00 9 37 41.8 12 29 07 9 38 11.70:i2 20 29.4 5 18 Leonis. " The positions are referred to the mean equinox of Jan. 1st, 1848. " This comet is remarkable for the length of time during which it VOL. II. 1 2 PROCEEDINGS OF THE AMERICAN ACADEMY was visible, it having been discovered in July, 1S47. When last seen, its distance from the earth was three hundred nnillions of miles, and from the sun three hundred and fifty millions ; yet it was still bright enough to admit of pretty good determinations. " A scintillation or twinkling of its central light was frequently re- marked, an indication, perhaps, of a solid nucleus." Professor Agassiz related some observations he had made up- on the form of the extremities in the embryonic state of birds. Dr. C. T. Jackson stated that he had obtained a considera- ble quantity of foliated tellurium from specimens of gold ore found near Frederick, Virginia. Mr. Cole read a letter from Mr. Spencer of Canistota, New York, detailing the history of his attempts at constructing achromatic microscopes, and of the improvements he had effect- ed : — referred to the Rumford Committee. Miss Maria Mitchell of Nantucket, the discoverer of the comet which bears her name (Vide Proceedings, Vol. I. p. 183), was chosen an Honorary Member of the Academy. Dr. Joseph Leidy of Philadelphia was elected a Correspond- ing Member. At the annual election, the following officers were duly elect- ed for the ensuing year : — Jacob Bigelow, M. D., . . President. Edward Everett, LL. D., Vice-President. Asa Gray, M. D., Corresponding Secretary. A. A. Gould, M. D., . . . Recording Secretary. J. Ingersoll Bowditch, . Treasurer. John Bacon, Jr., M. D., . . Librarian and Cabinet- Keeper. The Standing Committees were filled as follows : — Rumford Committee. Eben N. Horsford, Benjamin Peirce, John Ware, Joseph Lovering, Francis C. Lowell. Committee of Publication. Asa Gray, Louis Agassiz, W. C. Bond. Committee on the Library. A. A. Gould, D. H. Storer, Benjamin Peirce. OF ARTS AND SCIENCES. 6 Three hundred and ninth meeting. August 10, 1848. — Quarterly Meeting, The Vice-President in the chair. Dr. Gould, from the Library Committee, presented a report on the condition and pressing wants of the Library ; and the annual appropriation for its care and increase was voted. Dr. Gray, from the Committee of Publication, submitted a statement of bills due, and an estimate of the expenses liable to be incurred during the year in carrying on the printing of the Memoirs and the Proceedings of the Academy ; and the annual appropriation was voted for the purpose. The Corresponding Secretary submitted a memoir on the development of the ova and on the diseases of Limnasa, by Dr. Henry L Bowditch. Mr. Epes Sargent Dixwell, Henry L Bowditch, M. D., and Mr. Edward C. Cabot, were elected Fellows of the Academy, John L. Le Conte, M. D., of New York, and Professor James Hall, of Albany, were elected Corresponding Members, Three hundrad and tenth meeting, October 3, 1848. — Monthly Meeting. The President in the chair. The Corresponding Secretary read letters from Messrs. E. S. Dixwell, Henry L Bowditch, and Edward C. Cabot, accepting the fellowship of the Academy. Also a letter from the Hon. Secretary of the Navy, requesting suggestions from the Acade- my in respect to the projected astronomical expedition of Lieu- tenant Gillis to some southern point in South America. Re- ferred to Professor Peirce and Mr. Bond. Mr, Everett stated that he had received information, through the Danish Charge d'Affaires at Washington, that the conditions of the award of the King of Denmark's medal for the discov- ery of telescopic comets would probably be so far waived in favor of Miss Mitchell, as to the time and mode of announcing the discovery, that she would receive the medal. 4 PROCEEDINGS OF THE AMERICAN ACADEMY Mr. Everett, having alluded to the letter addressed to him- self, as President of the University, by W. C. Bond, Esq., Director of the Observatory, announcing the discovery, on the 16th of September, of an eighth satellite of Saturn,* read a short paper on the discovery of the other satellites by Huyghens, Cassini, and Sir William Herschel, and on the name proper to be given to the satellite discovered by the Messrs. Bond. Adopting the nomenclature proposed by Sir John Herschel, in his late work on the Cape Observations, Mr. Everett suggested that the new satellite, which comes next to lapetus, might be called either "Prometheus" or " Hesper," sons of lapetus: or, if a brother of Saturn were preferred, it might be called " Hy- perion." Some discussion arose on this point ; and a commit- tee, consisting of Messrs. Everett, Felton, Sparks, Peirce, and Bond, was appointed on the subject of the discovery, and of a name proper to be given to it. Professor Agassiz gave an account of the fossil Cetacea * Mr. Bond's letter is as follows : — " Observatory, Cambridge, Sept. 25, 1848. "Dear Sir, — " On the evening of the 16th of this month a small star was noticed, situated nearly in the plane of Saturn's ring, and between the satellites Titan and lapetus. It was regarded at the time as accidental. It was, however, recorded, with an estimated position in regard to Saturn. " The next night favorable for observation was the Idth, and, while comparing the relative brightness of the satellites, the same object, similarly situated in re- gard to the planet, was again noticed, and its position more carefully laid down. But still at the time we scarcely suspected its real nature. " From accurate measurements on the evening of the 19lh, the star being found to partake of the retrograde motion of Saturn, that portion of the heavens toward which the planet was approaching was carefully examined, and every star near its path for the two following nights laid down on a diagram, and micrometric meas- ures of position and distance with objects in the neighbourhood were taken. " The evening of the 20th was cloudy. On the 21st the new satellite was found to have approached the primarj', and it moved sensibly among the stars while un- der observation. Similar observations were repeated on the nights of the 22d and 23d. Its orbit is exterior to that of Titan. It is less bright than either of the two inner satellites discovered by Sir William Herschel. " Respectfully, " W. C. BOND." *' President Everett ." OF ARTS AND SCIENCES. O which have been found in the United States, and which are much more numerous than is generally supposed. He show- ed nearly perfect sculls of four distinct species, belonging to three different genera, and various parts of three more species. Of these seven species, six belong to the family of Zeuglo- donts, and one to that of the true Dolphins. They were all found in the lower tertiary deposits of the Southern States. The new types described by Professor Agassiz were discovered by Mr. Holmes of Charleston, South Carolina, and by Mr. Markoe of Washington. It is intended to publish extensive illustrations of all these fossils. Professor Gray, from the Publishing Committee, announced that a new volume of Memoirs was nearly ready for distribu- tion, and proposed that a committee should be appointed to fix some general rules for the disposition of the publications of the Academy. Messrs. Everett, Felton, Gray, Sparks, Agassiz, Walker, and Gould were appointed a committee for this pur- pose. Three humlred and eleventh meeting. November 8, 1848. — Quarterly Meeting. The President in the chair. Mr. Everett, from the committee appointed at the last meeting on the discovery of the eighth satellite of Saturn, and on a name suitable to be given to it, read a detailed report, which was referred to the Committee of Publication for the purpose of having it appended to the third volume of' Me- moirs about to be issued [where it has been printed in full]. Professor Gray presented a Memoir, entitled "Plantee Fend- lerianas Novi-Mexicanas : an Account of a Collection of Plants made chiefly in the Vicinity of Santa Fe, New Mexico, by Augustus Fendler ; with Descriptions of the New Species, Critical Remarks, and Characters of other undescribed or little known Plants from surrounding Regions " ; and made some general observations on the characteristics of the vegetation of New Mexico, now first brought to the notice of botanists. 6 PROCEEDINGS OF THE AMERICAN ACADEMY " Desirous to render the occupation of New Mexico by the United States troops subservient to the advancement of science, and to make known the vegetation of a region which had scarcely been visited by a naturalist, Dr. Engelmann and myself, with the cooperation of one or two friends who patronized the enterprise, induced Mr. Fendler to un- dertake a botanical exploration of tlie country around Santa Fe. In execution of this plan, Mr. Fendler left Fort Leavenworth, on the Mis- souri, on the 10th of August, 1846, with a military train, he having been allowed by the Secretary of War a free transportation for him- self, his luggage, and collections. " Mr. Fendler travelled the well-beaten track of the Santa Fe trad- ers to the Arkansas, and then followed that river up to Bent's Fort, which he reached on the 5th of September. On the 25th of Septem- ■ her the Arkansas was crossed, four miles above Bent's Fort, and the westerly course was now changed to a southwestern direction, through an arid and very barren region, where the shrubby Alriplex was the most characteristic plant, and furnished almost the only fuel to be ob- tained. Thus far the country was a comparatively level, or rather rolling, prairie, rising gradually from one thousand to more than four thousand feet above the sea. But on Sept. 27th, the base of the moun- tain chain was reached, which is an outlier of the Rocky Mountains, and attains in the Raton Mountains the elevation of eight thousand feet. West of these, in dim distance, the still higher Spanish Peaks appear, which have only been visited, very cursorily, by the naturalists of Ma- jor Long's expedition in 1820. Scattered Pine-trees are here seen for the first time on the Rio de los Animos (or Purgatory River of the Anglo-Americans), which issues from the Raton Mountains. The par- ty several times crossed large perfectly level tracts, which at this sea- son, at least, showed not a sign of vegetation ; in other localities of the same description, nothing but a decumbent species of Opuntia was ob- served. The sides of the Raton Mountains were studded with the tall Pinus hrachyptera, Engelm., and the elegant Pinus concolor. De- scending the mountains, the road led along their southeastern base, across the head-waters of the Canadian. " On the 11th of October, Mr. Fendler obtained the first view of the valley of Santa F6, and was disagreeably surprised by the apparent sterility of the region where his researches were to commence in the following season. The mountains rise probably to near nine thousand feet above the sea-level, two thousand feet above the town, but do not OF ARTS AND SCIENCES. 4 reach the line of perpetual snow, and are destitute, therefore, of strict- ly alpine plants. Their sides are studded with the two Pines already- mentioned, with PinusJIexilis, &c. " The Rio del Norte, twenty-five or thirty miles west fi'om Santa Fe, is probably two thousand feet lower than that town. Its flora is meagre ; but some interesting plants were obtained on its sandy banks, or on the black basaltic rocks, which in other places rise directly from its brink. South and southwest of Santa Fe, an almost level and ster- ile plain extends for fifteen miles, which supports little vegetation, ex- cept four or five Cactecs, some Grasses, and here and there a bush of the Shrub Cedar. To the west and north there is a range of gravelly hills, thinly covered with Cedar and the Nut Pine. The valleys be- tween the hills appear to have a fertile soil, but cannot be cultivated for want of irrigation. They furnished some very interesting portions of Mr. Fendler's collection. " By far the richest and most interesting region about Santa Fe, for the botanist, is the valley of the Rio Chiquho {liuJe creek) or Santa Fe Creek. It takes its origin about sixteen or eighteen miles northeast of the town, from a small mountain lake or pond, runs through a narrow, chasm-like valley, which widens about three miles from Santa Fe, and opens into the plain just where the town is built. Below, the stream is almost entirely absorbed by the numerous irrigating ditches, which are ^most essential for the fertilization of the otherwise sterile fields. Most of the characteristic plants of the upper part of the creek and of the moun- tain-sides are those of the Rocky Mountains, or of allied forms ; some of which, such as Atragene Ochotensis or alpina, Draha aurea, &c., have never before been met with in so low a latitude (under 36°). " Mr. Fendler made his principal collections from the beginning of April to the beginning of August, 1847, in the region just described. At that time, unforeseen obstacles obliged him to leave the field of his successful researches. He quitted Santa Fe on the 9lh of August, followed the usual road to Fort Leavenworth, which separates from the ' Bent's Fort road ' at the Mora River, and unites with it again at the ' Crossing of the Arkansas.' The first part of the route from Santa Fe to Vegas leads through a mountainous, wooded country, of much botanical interest, crossing the water-courses of the Pecos, Ojo de Ber- nal, and Gallinas. From Vegas the road leads northeastwardly through an open prairie country, occasionally varied with higher hills, as far as the Round Mound (6,655 feet high, according to Dr. VVislizenus). The 8 PROCEEDINGS OF THE AMERICAN ACADEMY principal water-courses on this part of the route, all of which furnished different remarkable species, were the Mora, Ocate, Colorado (the head of the Canadian), and Rock Creek, all of which empty into the Cana- dian. Rabbit's Ear Creek and McNees Creek (the head-waters of the north fork of the Canadian) are east of the mountains altogether. From thence the Cimarron was reached, where the Cold Spring, Up- per, Middle, and Lower Spring, and Sand Creek are interesting local- ities. On September 4th, Mr. Fendler recrossed the Arkansas, and reached Fort Leavenworth on the 24th of that month. " The systematic enumeration of the plants collected by Mr. Fend- ler, at this time presented to the Academy, extends to the close of the Compositse (Nos. 1-462); and embraces the following new species, viz. : — Thaliclrum Fendleri. Berberis Fendleri, a beautiful and very distinct species, allied to B. Canadensis. Argemone hispida, — also gathered by Fremont and Wislizenus, — allied to A. grandiflora. Nasturtium sphcBrocarpum, a species with almost exactly globose sili- cles, as its name indicates. Streptanthus micranthus, and S. lineari- folius, Cardamine cordifolia, a species most resembling C. asarifolia of the Old World. Sisymbrium incisitm, which has the pods of S. So- phia, but with longer pedicels and much coarser foliage. Vesicaria Fendleri, a very distinct species of a genus which appears to have its principal focus in Texas and New Mexico. Lepidium alyssoides, which was also found by Fremont. Drymaria sperguJoides, and D. te- nella, two remarkable narrow-leaved species. Arenaria Fendleri, a grassy-leaved species of a group not before found in the New World. Sidalcea Neo-3Iexicana, and S. Candida, belonging to a new genus, of which Sida diploscypha, Torr. 4* Gi'-, is the type. Ceanothus Fend- leri. Dalea nana, Torr. ined., allied to D. aurea. Astragalus diphy- sus, and A. cyaneus ; and four new species of Pliaca, viz. P. Fendleri, P. gracilenta, P. macrocarpa, and P. picta. Calliandra herbacea, a small, depressed herb. Mimosa borealis, a shrub, found north of lat. 37°, also gathered in flower by Mr. Gordon. Potentilla diffusa, and P. crinita. (Enothera (Pachylopliis) eximia, the largest and most striking species of the section, and apparently one of the handsomest of the genus ; and CE. (Salpingia) Fendleri, also a very showy species. The new Cactese are Mammillaria papyracantha, Cereus Fendleri, and Opuntia plia;acantha, described by Dr. Engelmann, who has very successfully investigated this family. Ribes leptanthum. Pliiladel- plius microphyllus, a charming species. Archemosa Fendleri. Cy- OF ARTS AND SCIENCES, 9 mopterus Fendleri. Thaspium ? monlanum. Of Loranthacese, Pho- radendron juniperinum, Engelm., with two Arceutholia which Dr. Engelmann considers distinct from the A. oxycedri of the Old World. Galium Fendleri, and G. asperrimum. " The following are the new Compositae of the collection, viz. : — Clavigera hrachyphylla. Brickellia Fendleri. Aster Fendleri. Eri- geron canum, E. cinereum, and E. Jtagellare. Townsendia Fendleri and r. eximia, two interesting additions to a genus characteristic of the region (and still another is added from farther south). Gutierrezia {Hemiachyris) sphcErocephala. Franseria tenuifolia, and F. tomenfosa. Bidens tenuisecta. Sanvitalia Aherti. Heterospermum tageliniim. Lowellia aurea, a new genus allied to Dysodia. Schkuhria Neo- Mexicana. Actinella argenlea, the most showy species of the genus. Amaurial dissecla, also found by Fremont. Senecio Fendleri. Cir- sium ochrocentrum. Crepis amhigna. Macrorliynclms purpureus. " Numerous species and several new genera are characterized in notes to the memoir, of which the greater part are from the North- Mexican collections of Dr. Wislizenus and Dr. Gregg." Mr. James D. Dana, of New Haven, presented a continuation of his brief synopsis of the characters of the Crustacea ob- tained during the cruise of the vessels of the United States Exploring Expedition, as follows : — Conspectus Crustaceorum quce in Orhis Terrarum ciraimnavigatione, Carolo Wilkes e Classe Reipubliccp. Fcederatce. Duce, lexit et de- scripsit Jacobus D. Dana. Pars II.* Familia III. C A L A N I D ^ . Oculi simplices ; etiam ssepe alii duo inferiores deorsum spectantes. Pedes mandibulares maxillaresque articulati et longe setigeri. Sac- cuius oviger unicus. A7if.enn<^ anticce elongata?, non appendiculatse. Antennoi posticcB apice setigerse. Genera notis sequentibus distinguenda : t — * Vide Partem I., Vol. I. p. 149. \ Membra pedalia Cyclopaceorum ordine seqiientia : — I. Pedes mandibulares duo (membra cejilialotboracis, ad normam, yuarta, — ct. iv.). II. Maxillae duae (ct. v.). vor.. II. 2 10 PROCEEDINGS OF THE AMERICAN ACADEMY fAntennis an- ticis nee an- gulo flexis, 3 3 'Pedibusposti- cis (ct. xii.) non prelien-< silibus, sEBpe obsoletis. nee articula-< tione geni culatis. •- < C 3 O o Pedibus anticis (ct. vii.) majo- ribus quam rnaxillipedes (ct. vi.), lateraliter porrectis, non geniculatis 1. Calanus. Pedibus anticis minoribus quam rnaxillipedes. Maxilii- pedibus sub corpora genicula- tis. Abdomine longissimo. 2. Scribella. Pedibus posticis elongatis, subulatis, uno siib- prehensili ; pedibus anticis dupio geniculatis, sub corpore gestis, apice deflexis. . . . 3. EUCHJETA. Antennis anticis angulo levissime flexis, nunquam articula- tione geniculatis. Pedibus posticis maris prehensilibus. . 4. Undina. Antennfi antica maris dextrA geniculante. 'Maxillipedibus dupIo genicu- latis, inflexis, setis longis, nu- dis 5. Candace. Max. rectis, setis longis, setu- losis 6. CVCLOPSINA. ■ o 1 3 u Id ^ 3 c a .^- !- < 71 m O 3 3 JS o 1.4 C^ Oculis superioribus nullis, inferioribus grandibus. Antenna antica dextri maris geniculante ; aliis Calano affinibus 7. Catopia. 'Antenni antica dextra maris non geniculante, ambabus flexilibns, setis diftusis. Pedibus posticis parvulis, uni- articulatis 8. Acartia. Antenna antic4 dextra maris geniculante ; setis non dif- fusis. Pede postico dextro crasso, prehensili. ... 9. Pontella. Genus I. CALANUS. {Leach.) Rostrum furcatum. Antennce. anticm sive leviter curvatse, slve rectse, maris non geniculantes. Pedes post ici (ct. xii.) obsolescentes, ma- ris non prehensiles. Pedes antici (ct. vii.) elongati, late porrecti, maxillipedibus (ct. vi.) majores, non geniculati. Oculi inferiores nulli. Cephalothorax 4 - 5-articulatus. Rami antennarum postica- rum siiba^qui, ramo breviore ad apicem 3-setis instructo, in dorse sa- tire ro.* III. Maxillipedes (vel maxilla;) duo (ct. vi.). IV. Pedes antici (vel maxillipedes) duo (ct. vii.). v., VI., VII., VIII., et saepe IX. Pedes biremes octo vel decern (ct. viii., ix., X., xi., xii.). In ambiguis, etiam numcri {soil. ct. iv., ct. v., etc.) saepe subjuncti. Mandibulum articulus pedis mandibularis primus est, et "palpi" articuli se- quentes pedis reliqui sunt. * Species optimc distinguendrc sunt : — 1. Per gestum antennarum anticarum ; etiam per setas, praccipue apicales ct sub- apicales; per longitudinem et numerum articulorum : 2. Per maxillipedes, et pedes anticos : OF ARTS AND SCIENCES. 11 Syn. — Cyclops, Milller. — Calanus, XeacA. — Cetochilus ? Roussel de Vauzlme. I. SetjE Antennarum' Anticarum apicales subapicalibus lon- GIORES. A. Slyli caudales curti. 1. Calanus rotundatus. — Frons rotundata. Cephalothorax 4-ar- ticulatus, crassus, postice obtusus. Antennse anticse corpore vix brevi- ores, 24-articulalfE, duplo curvatse, apicibus fronte paulo posteriores, articulo ultimo elongate ; setis apicalibus articulum sequantibus, anticis apice remotis, setis subapicalibus minutis. Styli caudales brevissimi ; setis inasquis, secundis abdomine longioribus et apice divaricatis. Long. yV". — Hah. in mari Pacifico, lat. aust. 32° 24', long. ocg. 166° ; lat. bor. 3°, long, orient. 176° ; lat. bor. 28°, long, orient. 171° 30'. — Lect. die 9 Ap., 1840 ; die 19 Ap., 1841 ; et die 17 Maii, 1841. 2. Calanus comptus. — Frons rotundata. Cephalothorax 4-articu- latus, postice obtusus. AntennfE anticae tenuissimae, cephalothorace paulo longiores, ferme 24-articulata^, duplo curvatae, apicibus fronte posteriores, articulo ultimo elpngato (forsan duplice) ; setis apicalibus articulum fere aequantibus, anticis apice remotis, postica penultima ar- ticuli longitudine, antica penultima et antepenultimis minutis. Styli caudales breves ; setis strictis, rectis, duobus paulum longioribus. Long. yV'. — Hah. in mari Pacifico, lat. bor. 40°, long. occ. 157° ; lat. bor. 45°, long. occ. 156° ; lat. aust. 21^°, long. occ. 136°. — Lect. diebus 2, 6 Jul., 1841 ; 13 Aug., 1839. 3. Calanus NUDus. — Frons rotundata, prominulus. Cephalothorax 4-articulatus, postice subacutus. Antennae anticae cephalothorace vix longiores, ferme 18-articulatas, articulo ultimo non longiore ; setis totis brevissimis, apicalibus articulo non longioribus, et anticis apice vix re- motis, subapicalibus minutis. Styli caudales paulum oblongi, setis rec- tis, strictis, abdomine non longioribus. Long. gV"- — Hah. in mari Atlantico, lat. bor. 8° - 0°, long. occ. 21° - 18°, et lat. aust. 0° - 6°, long. occ. 18° - 25°. — Lect. diebus 20, 22, 25 Oct., et 1, 3, 5, 8, 12 Nov., 1838. 3. Per pedes posticos thoracicos : 4. Per numerum segmentorum cephalothoracis, et characteres segmentorum an- tici posticique : 5. Per stylos caudales et eorum setas : Articulatio cephalothoracis non valet genera distinguere. Nunierus segmento- rum abdominis per setatem variat, et vix valet species distinguere. 12 PROCEEDINGS OF THE AMERICAN ACADEMY 4. Calanus Magellanicus. — Frons rotundata. Cephalothorax 4- articulatus, postice obtusus. Antennse anticai corpore breviores, duplo curvata?, apicibus fronte valde posteriores, articulis quatuor ultimis bre- vibus, subaequis ; setis totis perbrevibus, apicalibus articulo* brevioribus, anticis apice remotis, subapicalibus posticls minutis, anticis obsoletis. Styli caudales perbreves, selis abdominem fere fequantibus. Long. jJj". — Hah. in mari Pacifico, lat. aust. 52°, prope Patago- niam. Lect. die 27 Mar., 1839. 5. Calanus crassus. — Frons rotundata. Cephalothorax crassus, 4-articulatus, postice vix subacutus. Antennce anticce corpore brevio- res, apicibus fronte valde posteriores, setis brevibus, apicalibus paulo longioribus, subapicalibus minutis, aut obsoletis. Styli caudales per- breves, setis subasquis abdomine paulo brevioribus. Long. y'^". — Hah. in mari Allantico, lat, aust. 9°, long. Occident. 17° 30'. — Lect. die 9 Mali, 1842. 6. Calanus furcicaudus. — Frons triangulata. Cephalothorax 4- articulatus, capite subito angustatus, postice obtusus. Antennae anticse corpore paulo breviores, duplo curvatse, apicibus fronte posteriores, ferme 24 (26 .^)-articulatae ; articulo ultimo paulo longiore ; setis bre- vibus, prope basin numerosis, apicalibus articulo paulo longioribus et anticis apice parce remotis, subapicalibus minutis. Styli caudales setae- que late divaricati, setis intequis, secundis abdomine longioribus. Long. -^2"- — Hal), in mari Pacifico, lat. bor. 3°, long, orient. 173°. — Lect. die28 Ap., 1841. 7. Calanus arcuicornis. — Frons obtusa. Cephalothorax 4-arti- culatus, capite angustatus, postice subacutus. Antennse anticce cepha- lothorace vix longiores, leviter arcuatse, apicibus fronte vix posteriores, articulis 4 ultimis subsequis, setis perbrevibus, apicalibus articulo valde brevioribus, duabus uncinatis, subapicalibus obsoletis, prope basin pau- cis brevibus uncinatis. Abdomen angustum, lineare. Styli caudales per breves, selis strictis, rectis, abdominis longitudine. Long. tV'. — Hah. in mari Pacifico, lat. aust. 32° 24', long, orient. 178° 15'. — Lect. die 9 Ap., 1840. B. Styli caudales valde elongati. 8. Calanus tukbinatus. — Frons obtusa. Cephalothorax antice crassus, postice attenuatus (idcirco, segmentum posticum abdomine * In his, "setffi articulo breviores" et aliis siniilibus, articulus ille has setas geiens passim intelligentus. OF ARTS AND SCIENCES. 13 parce latius) obtusiusculus. Antennse anticee duplo leviter curvatse, corpore breviores, tenuissima), articulis 5 ultimis subaequis ; setis totis pcirbrevibus, apicalibus subapicalibusque articulo non longioribus. Styli caudales tenues, parallel!, setis dimidio brevioribus. Long. yV'. — Hah in mari " Sulu." — Lect. die 29 Jan., 1842. 9. Calanus stylifer. — Frons truncata. Cephalothorax curtus, postice abdomine valde latior et longe acutus, 5-articulatus, segmento ultimo brevissimo. Antennae anticse duplo paululum curvatse, apicibus fronte non posteriores ; setis perbrevibus, apicalibus et penultima pos- tica fere articuli longitudine, penultima antica et antepenultimis brevis- simis. Styli caudales tenues, fere abdominis longitudine, recti, paral- leli, setis non longioribus, una valde externa. Long. -j-V'. — Hah. in mari Atlantico, lat. aust. 23° - 24°, long. occ. 41° -43°.— Lect. die 19 Nov., 1838, et 9 Jan., 1839. 10. Calanus curtus. — C. stylifero similis, sed curtior. Cephalo- tborax 5-articuIatus, segmentis 4 posticis subaequis. Antennae anticae corpore paululo longiores,* tenuissimas, duplo paulum curvatae, apici- bus fronte vix anteriores ; setis perbrevibus, apicali antica longiore, articulum non superante. Styli caudales tenues, fere abdominis lon- gitudine, vix recti, setis non longioribus, flexuosis, una valde externa. Long. gJjj". — Hah. in mari " Sulu " ; etiam freto Sundae. — Lect. die 27 Jan., et die 2 Mar., 1842. 11. Calanus scutellatus. — Late depressus. Cephalothorax 4- articulatus, segmento antico antice forte arcuato, postice late produc- to et acuto, segmento postico utrinque longe acuto, et divaricato. An- tennae anticse corpore paululo longiores, duplo curvata;, apicibus fronte vix anteriores ; setis brevibus, apicali antica penultimaque postica ar- ticuli longitudine, aliis subapicalibus perbrevibus. Styli caudales te- nues, fere abdominis longitudine, parce divaricati. Long. Jg". — Hah. in mari " Sulu." — Lect. die 27 Jan., 1842. II- Set>e Antennarum Anticarum apicales subapicalibus non LONGIORES. A. SetcB caudales lotcB mediocres. Frons ohlusa. non elongafa. a. Cephalothorax 4-articulatus. 12. Cj»!lanus pavo. — Frons subtriangulata, obtusa. Cephalotho- rax postice obtusus. Antennae anticae corpore dimidio longiores, duplo * I. e. stylis exciusis, ut passim. 14 PROCEEDINGS OF THE AMERICAN ACADEMY curvatae, articulo ultimo longiore, setis longiusculis. Abdomen brevis- simum. Slyli caudales breves, divaricati, setis fere corporis longitu- dine, latis, eleganter plumiformibus, flabellatim divaricatis. Long. -^■^". — Hah. in mari Atlantico, lat. bor. 12°, long. occ. 24°. — Lect. die 9 Oct., 1838. 13. Calanus LEVIS. — Frons obtusa. Cephalothorax mediocris, postice subacutus. Antennae anticaj corpore vix longiores, dupio leviter curvatae, apicibus fronte non anteriores ; setis brevibus, 4-5 remotis longioribus, apicalibus et antica penultima fere articuli longi- tudine, posticis penultima antepenultimaque paulo longioribus, subae- quis, antica antepenultima obsoleta. Styli caudales parce oblongi, se- tis rectis, appressis, abdominis longitudine. Long. 215-". — Hah. in mari Atlantico juxta " Rio de Janeiro." — Lect. die 7 Jan., 1839. 14. Calanus medius. — Frons rotundata. Cephalothorax postice ob tusus. Antennae anticae cephalothorace paulo longiores, duplo curva tae, apicibus fronte posteriores ; setis perbrevibus, 4-5 remotis longiori bus, postica apicali et antica penultima large articuli longitudine, pos tica penultima paulo breviore, postica antepenultima duplo longiore Styli caudales breves, setis appressis, abdomine brevioribus. Long. yV"' — Hah. in mari Pacifico, lat. bor. 44°, long. occ. 153°. — Lect. die 6 Jul, 1841. 15. Calanus placidus. — Frons rotundata. Cephalothorax postice obtusus. Antennae anticae corporis longitudine, duplo leviter curvatas, apicibus fronte paulo posteriores ; setis apicalibus brevibus, posticis penultima antepenultimaque valde elongatis, antica penultima dimidio breviore. Styli caudales breves. Long, y'g-"- — Hob. in mari Pacifico, prope insulas " Kingsmill " ; etiam lat. bor. 40°, long. occ. 157°. — Lect. die 30 Ap., et 2 Jul., 1841. 16. Calanus recticornis. — Frons obtusa. Cephalothorax postice rotundatus. Antennae anticae corpore longiores, rectissimae, apicibus fronte non anteriores, articulo prlmo (2.'') crasse oblongo, ultimo pau- lum demisso ; setis brevibus, articuli secundi subelongata, articuli an- tepenultimi postica longiore (=: 4 artic), penultimis postica et antica paulo brevioribus, apicali postica minore, articulo longiore, duabus aliis apicalibus brevibus et subuncinatis. Styli caudales breves ; setis me- diocribus, parce diffusis. Long. tV"- — iiah. in mari " Sulu." — Lect. die 1 Feb., 1842. OF ARTS AND SCIENCES. 15 h. Cephalothorax 5 - 6-articulatus. 1. Cephalothorax posiice obtusus aut breviier subacutus* 17. Calanus setuligerus. — Frons rotundata. Cephalothorax 5 (6 ?)-articulatuis, postice obtusus, articuUs subaequis. Antennae anticae corpore paulo longiores, duplo curvatae, setis prope basin plerumque duplo longioribus quam articuli et numerosis, seta articuH sexti (forsan quinti) longiore, setis duabus posticis subapicahbus longis, subaequis, apicahbus brevibus, antica penultima longiore quam articulus. Styli caudales perbreves ; setis mediocribus, parce diftusis, secundis fere duplo longioribus. Long. yV'. — Hah. in mari Atlantico, lat. bor. 6° -9°, long. occ. 21° -24°. — Lect. diebus 13-18 Oct., 1838. 18. Calanus pellucidus. — Frons rotundata. Cephalothorax 5- articulatus, postice obtusus, articulo ultimo brevi. Antennae anticae corporis longitudine, setis subapicalibus posticis longiusculis. Styli caudales oblongi. Long. 2-V'' — Hab. in mari Atlantico, lat. bor. 14^°, long. occ. 21°. — Lect. die 5 Oct., 1838. 19. Calanus AFFiNis. — Frons rotundata. Cephalothorax 5-articu- latus, postice obtusus, articulis posticis subasquis. Antennae anticae cor- poris longitudine, apicibus fronte posteriores ; setis brevibus, duabus posticis subapicalibus praelongis, antica penultima dimidio breviore, apicalibus brevibus. Styli caudales perbreves, setis diffusis, secundis fere duplo longioribus quam primae. Long. yV'. — Hah. in mari prope insulam " Sumatra." — Lect. die 3 Mar., 1842. 20. Calanus FLAviPES. — Frons triangulata, vix prominula. Cepha- lothorax 5-articulatus, postice attenuatus, obtusus aut subacutus. An- tennae anticae corpore paulo longiores, duplo leviter curvatae, apicibus fronte vix posteriores; setas affini similes. Styli caudales oblongi, setis mediocribus, non diffusis. Abdomen 2-articulatum ; — an adultum ? Long. y\y". — Hah. in mari Atlantico, prope " Rio de Janeiro." — Lect. die 7 Jan., 1839. 21. Calanus tenuicornis. — Frons rotundata. Cephalothorax 5- articulatus, postice obtusus, articulis posticis subaequis. Antennae anti- cae sesqui corporis longitudine, tenuissimae, duplo levissime curvatae, * Angiili postici cephalotlioracis adiilti sispe elongati et subacuti aut aruti. IG PROCEEDINGS OF THE AMERICAN ACADEMY apicibus frontc vix posteriores, articulis tribus ultimis subfequis ; setis brevibus, articuli tertii seta longiore, setis duabus posticis subapicalibus praelongis, antica. penultima prope dimidio breviore, apicalibus brevi- bus. Styli caudales oblongi (latitudine duple longiores). Long. yy. — Hah. in mari Pacifico, lat. bor. 40', long. occ. 157°. — Lect. die 2 Jul., 1841. 22. Calanus SANGUINEUS. — Frons rotundata. Cephalothorax 5-ar- ticulatus, postice obtusus aut subacutus, articulis posticis subaequis. An- tennae antica3 corporis longitudine, fere rectse, apicibus fronte vix poste- riores ; setis brevibus, articuli tertii longiore, subapicalibus tenuicorni fere similibus. Styli caudales paulum oblongi, setis mediocribus, diffu- sis, secundis longioribus. Long. y'(j". — Hah. in mari Pacifico, lat. bor. 32°, long. occ. 175° ; lat. bor. 44°, long. occ. 153° ; forsan in mari " Sulu." — Lect. die 28 Mail, et die 6 Jul., 1841, etiam die 28 Jan., 1842. — Var. perspicax (oculus transversim reniformis) in mari " Viti," Jul., 1840. 23. Calanus mundus. — Frons rotundata. Cephalothorax postice obtusus, 5-articulatus, articulis posticis subaequis. Antennae anticae cor- pora parce longiores, bene rectae, apicibus fronte non posteriores, arti- culo primo (2do ?) crasse oblongo et setis inflexis instructo ; setis per- brevibus, articuli secundi longiore, apicalibus brevibus, postica antepe- nultima longa, postica penultima duplo breviore, antica penultima pau- lo minore (articulum aequante), antica antepenultima minuta. Abdo- men 4-5-articulatum. Styli caudales breves, setis appressis, secundis longioribus. Long. yV- — Hah. in mari Pacifico, lat. bor. 44°, long. occ. 154°. C. recticorni affinis ; sed cephalothorax 5-articulatus. 24. Calanus inauritus. — Frons rotundata. Cephalothorax pos- tice obtusus, 5-articulatus, articulo ultimo brevissimo. Antennae anti- cae fere recta, corpore paulo breviores, articulo primo valde elongate (an duplice .') tribus setis pendulis subclavatis et aliis setis brevibus un- cinalis instructo, setis apicalibus et anticis subapicalibus perbrevibus, subapicalibus posticis articulo vix longioribus, inaequis. Styli caudales breves, setis parce diifusis aut appressis. Hah. in mari Atlantico, lat. bor. 6°, long. occ. 21°. — Lect. die 22 Oct., 1838. 2. Ccphalothoraa: postick acutus, angulis posticis ahdomini appressis. 25. Calanus simplicicaudus. — Frons obtusa. Cephalothorax 5- OF ARTS AND SCIENCES. 17 articulatus, segmento postico angusto et postice brevissime acuto. An- tennse anticsB corpore paulo longiores, basi arcuatse, alioque fere rec- tae, apicibus fronte parce posteriores ; setis brevibus, duabus subapica- libus posticis longis, inaequis, antica penultima duplo breviore, apicali- bus brevibus. Abdomen 2-articulatum : (an adultum ?). Styli caudales paulum oblongi. Hah. in mari Pacifico, lat. bor. 45°, long. occ. 153°. C.Jlavipedi abdominem et angustum articulum cephalothoracis pos- ticum affinis ; antennarum anticarum setas apicales subapicalesque C. sanguineo si mills. 26. Calanus appressus. — Frons obtusa. Cephalothorax postice attenuatus, angulis posticis elongate acutis abdominem appressis, 5-ar- tieulatus, articulis posticis longitudine subaequis. Antennee anticse cor- pore paulo longiores, duplo leviter curvatse, articulo ultimo valde gra- ciliore quam penultimus ; setis brevibus, duabus posticis subapicalibus praelongis, subsequis, strenuis, antica penultima duplo breviore, apicali- bus articulo non longioribus. Styli caudales breves ; setis secundis longioribus. Long. yV'. — Hab. in mari Pacifico, lat. bor. 25°, long, orient. 167° ; in mari juxta " Sumatra " ; etiam lat. aust. 30°, long, orient. 13°. — Lect. die 14 Mali, 1841, et die 4 Mar., et 21 Apr., 1842. 3. Cephalothorax postid longe acutus, angulis posticis remotis. 27. Calanus communis. — Frons rotundata. Cephalothorax pos- tice longe acutus, 5-articulatus, articulis posticis subaequis. Antennae anticse corpore paulo longiores, duplo leviter curvatae, apicibus fronte non anteriores, setis apicalibus brevibus, duabus posticis subapicalibus longis, subaequis, antica penultima quadruple breviore, setis totis aliis brevibus. Styli caudales perbreves, setis secundis duplo longioribus. Long. y\j". — Hai. in mari Atlantico, inter lat. bor. 8° et lat. aust. 5°, long. occ. 23° -15°; etiam, lat. aust. 4^° - 1°, long. occ. 25°- 30^°. — Lect. diebus 18, 20, 27, 31 Oct., 2, 3, 8, 12 Nov., 1838 ; 13, 16 Mali, 1842. C. afjini similis ; sed anguli postici cephalothoracis longe acuti. An distinctio vera .'* 28. Calanus amjenus. — C. communi antennas anticas setasque cau- dales affinis. Cephalothorax 5-articulatus, sed articulo ultimo brevis-" simo ; angulis posticis longe acutis. VOL. II. 3 18 PROCEEDINGS OF THE AMERICAN ACADEMY Long. f\j". — Hab. in mari Pacifico prope insulas "Samoa," et in mari " Sulu." — Lect. die 26 Feb., 1841, et die 1 Feb., 1842. 29. CALANtrs BELLUs. — Frons rotundata. Cephalothorax postice longe acutus, 5-articulatus, articulis posticis suboequis. Antennae anticse corpore paululo longiores, vix duplo curvatse, apicibus fronte non ante- riores ; setis brevibus, tertii articuli longa, duabus posticis subapicali- bus longis, subsequis, apicalibus brevibus, antica penultima paulo lon- giore. Styli caudales breves, setis difiusis, secundis fere duplo longi- oribus. Long. I". — Hab. in mari " Sulu," et freto " Banca." — Lect. die 2 Feb., et die 2 Mar., 1842. C. setuligero affinis ; sed anguli postici cephalothoracis non obtusi, et setae caudales valde diffusiores. C. communi similis ; sed seta tertii articuli antennarum anticarum longa est. B. SetcB caudales secundce longissimce. Frons sive obtusa, sive tri- angulato-acuta ; rostro longe furcato, brachiis setiformibus. 30. Calanus GRACILIS. — Gracilis. Frons rotundata. Cephalotho- rax elongatus, 5-articula1,us, postice obtusus, articulis posticis subsequis. Antennae anticae sesqui corpore longiores, rectae, 160° inter sese divari- catse ; setis brevibus, duabus posticis subapicalibus longis, apicalibus et anticis subapicalibus brevibus. Abdomen curtum, 4-articulatum. Styli caudales breves, setis secundis dimidio corporis longioribus. Long. ^". — Hab. in mari Atlantico, lat. aust. 4^°, long. occ. 25°. — Lect. die 13 Maii, 1842. 31. Calanus ELONGATUS. — Elongatus. Frons breviter triangulata subacuta, rostro longe et tenuiter furcato. Cephalothorax 4-articula- tus, antice angustatus, postice obtusus. Antenna? anticEe sesqui cor- poris longitudine, rectse, et latissime divaricates, apicibus fronte vix anteriores, articulo penultimo abbreviato ; setis plerumque brevibus, paucis remotis longiusculis, apicalibus diffusis articulo longioribus, sub- apicalibus posticis longis, insequis, antica penultima minus dimidio bre- viore, antica antepenullima obsoleta. Antennae posticae ramo curto 2-articulataB. Abdomen curtissimum. Styli caudales brevissimi. Long. i". — Hab. in mari " Sulu." — Lect. die 1 Feb., 1842. 32. Calanus attenuatus. — Elongatus. Frons triangulata, acuta, rostro longe et tenuiter furcato. Cephalothorax antice valde angusta- tus, postice obtusus, 5-articulatus, articulo ultimo brevi. Antennae an- ticae corpore valde longiores, prope basin arcuatse, alioque rectae et OF ARTS AND SCIENCES. 19 latissime divaricatae, apicibus fronte paulo anteriores, articulo penulli- mo abbreviate ; setis vix brevibus, plerumque fraclis, fere sequis, api- calibus et subapicalibus inaequis longiusculis, antica antepenultima obsoleta. Antennae posticae ramo curto multiarticulato. Abdomen curtissimum. Styli caudales perbreves, setis secundis dimidio corporis longioribus. Lo7ig. ^". — Hah. in mari Pacifico, props insulas " Kingsmill " ; etiam in mari Sinensis, — Lect. die 13 Ap., 1841, et die 15 Feb., 1842. C. Frons valde elongata ; rostro breviter valdequefurcalo. Setcs caudales secundce. longissimcB (?). 33. Calanus rostrifeons. — Gracillimus. Frons valde elongata, subacuta. Cephalothorax antice paulo angustior, postice rotundatus, 5- articulatus, articulo poslico brevi, articulis penultimo antepenultimoque postice acutis. Antennae anticae corpore valde longiores, leviter arcu- atae, late divaricatae, apicibus fronte anteriores, seta articuli secundi longiuscula, setis apicalibus articulo vix longioribus, duabus subapicali- bus posticis longis. Abdomen curtum. Styli caudales latitudine fere duplo longiores ; setis latissime difFusis. Long. I". — Hah. in mari " Sulu." — Lect. die 2 Feb., 1842. 34. Calanus cornutus. — Gracillimus. Frons valde elongata, subacuta. Cephalothorax postice rotundatus, 5-articulatus, articulo postico fere obsoleto, articulis tribus precedentibus postice acutis. An- tennae anticae sesqui corporis longitudine, fere rectas, vix arcuatae, api- cibus fronte paululo anterioribus ; seta articuli tertii longiuscula, setis apicalibus et penultimis brevibus, postica antepenultima longiore. Ab- domen curtum. Styli caudales elongati ; setis valde difFusis. Long. ■^". — Hah. in mari Atlantico, lat. bor. 1°, long. occ. 18°. — Lect. die 3 Nov., 1838. Genus II. SCRIBELLA. {Dana.) Antennce anticcB elongatae, pauci-articulatae, longe setigerae, setis difFu- sis, maris non geniculantes. Antennce posticce simplices {}). MaxiU lipedes (ct. vi.) maximi, pedibus proximis majores, 4-articulati, geni- culati et prorsum flexi. Oculi inferior es nulli. Cephalothorax 4— 5-articulatus, capite non discreto. Abdomen valde elongalum, cepha- lothorace non brevius. Styli caudales oblongi, divaricati. [Stepius, e basi pedis biremis, seta grandis lateraliter porrecta.] Syn. — Scribella, D., Amer. Jour. Sci., Ser. 2da, T. 227. 20 PROCEEDINGS OF THE AMERICAN ACADEMY 1. ScRiBELLA SCRIBA. — AntennsB anticse late ( 130°) divaricatse, fere corporis longitudine, 7-arliculatEe, articulis secundo, quarto et du- abus ultimis brevioribus, setis longissimis. Seta pedium biremium externa grandis, eleganter plumiformis. Abdomen 5-articulatum, ce- phalothorace longius, setis basalibus duabus longiusculis rectis. Styli caudales tenues, seta externa fere styli longitudine. Long. -^y. — Hab. in mari Atlantic©, lat. bor. 4^° -7°, long. occ. 20° -22° ; et lat. aust. 1°, long. occ. 30° 30'. — Lect. diebus 22, 23, 24, 26 Oct., 1838, 16 Mali, 1842. Forsan in mari Pacifico, prope in- sulas " Kingsmill " ; an eadem species } — Lect. Ap., 1841. 2. ScRiBELLA SETiGER. — AntennsB anticae fere corporis longitudine, late divaricatae, 7-articulatae, articulis 3 ultimis brevissimis, tertio quar- toque praelongis, setis longissimis. Seta pedium biremium externa longa, nuda, tenuissime subclavata. Abdomen 5-articulatum, segmen- tis subsequis, setis basalibus duabus, una prselonga, altera brevi. Styli caudales tenues, seta externa valde longiore quam stylus et prope ba- sin styli insita. Long. 21)". — Hai. in mari Pacifico, prope insulas "Kingsmill." — Lect. die 18 Ap., 1841. 3. ScRiBELLA ABBREViATA. — Antennae anticae late divaricatae, 7-ar- ticulatae, articulis duabus ultimis brevibus, tertio, quarto, quintoque sub- aequis. Setae externae pedium biremium obsoletae (an distinctio sexu- alis ?). Abdomen 4-articulatum setis basalibus dimidio abdominis val- de brevioribus, subaequis, curvatis. Styli caudales paulum divaricati ; seta externa perbrevi. — An S. setigerce femina ? Vix credo. Long. ^V"- — Hab. in mari Pacifico, prope " Tierra del Fuego " ; etiam lat. aust. 24°, long. occ. 175° ; lat. bor. 44;}°, long. occ. 153°. — Lect. die 21 Jan., 1839 ; die 21 Ap., 1840 ; die 7 Jul., 1841. Genus 111. EUCH^TA. (Philippi.) Frons acuta. Rostrum transversim emarginatum. AntenncB anticce. duplo leviter curvatae, nunquam minime angulo flexae, maris non geniculantes. Pedes postici (ct. xii.) ambo maris valde elongati, subulati. Pedes antici (ct. vii.) maxillipedibus (ct. vi.) majores, duplo geniculati et sub corpore gesti, penecillum setarum nudarum reflexum ferentes. Oculi inferiores nulli. Cephalolhorax 4-5- articulatus, capite non discrete. Syn. — Euchaeta, Philippi, Archiv f iir Naturgeschichte, Vol. IX. p. 55. 6f arts and sciences. 21 1. EucH^TA COMMUNIS. — Cephalothorax nudus, 4-articulatus, pos- tice obtusus. FemincB : antennse anticse corpore vix breviores, setis paucis remotis prselongis, rectis, et aliis duabus flexis longissimis, apica- libus pra;longis, postica antepenultima fere articuli longitudine. Setse caudales rectae, secunda saepius corporis longitudine. Ova cserulea. Maris : antennae anticae corpore paulo breviores, angulo levissime flexae, setis brevibus, paucis articulum apicalem vix superantibus. Pe- des postici longissimi, longe subulati. Setae caudales abdominis longi- tudine. Long. ■^". — Hab. in mari Atlantico, lat. bor. 9° - 0°, long. occ. 17°-23°,et lat. aust. 0°- 13°, long. occ. 17°-32°. — Lect. dlebus 15, 18, 20, 24, 26, 27, 29, 30, 31 Oct., et 1, 3, 5, 9, 12 Nov., 1838 ; etiam die 11 Maii, 1842. 2. EucH^TA CONCINNA. — Ccphalothorax nudus, ellipticus, capite lateraliter arcuatus, angulis posticis paulum productus et obtusus ;yem- n<2 4-articulatus, maris 5-articulatus articulo postico perbrevi. Antennae anticae corpore paulo breviores, fe7nincB, marisque iis E. communis fere similes, seta antepenultima postica brevissima. Setae caudales abdomi- ne breviores, secunda/emince fere corporis longitudine, maris abdomi- nem paulo superantibus. Long. yV"- — Hah. in freto " Banca." — Lect. die 1 Mar., 1842. 3. EucH^TA PUBESCENS. — FemincB : Cephalothorax pubescens, capi- te lateraliter angulatus, 5-articulatus, articulo postico perbrevi, subacu- te. Antennae anticae corpore paulo breviores, setas E. communi fere similes, setis antepenultimis brevissimis. Pedes antici apice 5-articu- lati et subelongati. Abdomen 4-articulatum, articulo prime secundum longitudine duplo superante. Seta caudalis secunda ferme corporis longitudine. Long. yy. — Hah. in mari Pacifico, in Archipel. " Paumotu." — Lect. die 29 Aug., 1839. 4. EucH^TA DiADEMA. — Femiuic : Cephalothorax pubescens, ca- pite lateraliter angulatus, 4-articulatus, postice obtusus. Antennae anti- cae fere corporis longitudine, setas E. communi fere similes, seta postica penultima dimidium poslicae apicalis superante, setis antepenultimis brevissimis. Pedes antici apice 5-7 articulati, perbreves. Abdomen elongatum,-articulo prime secundum longitudine paulo superante. Se- ta caudalis secunda corpore longior, nuda. Long. }". — Hah. in mari Pacifico, prope insulas " Kingsmill." — Lect. diebus 23, 24, 25 Mar., 1841. 22 PROCEEDINGS OF THE AMERICAN ACADEMY Genus IV. UNDINA. (Dana.) Antennce antica ante medium angulo leviter fle.xse, apicibus fronte posteriores, maris non geniculantes. Pedes postici (ct. xii.) maris grandes, dextro subcheliformi. Pedes antici (ct. vii.) elongati, max- illipedibus ssepe majores et valde porrecti, non geniculati. Oculi inferiores nulli. Cephalothorax 4 - 5-articulatus, capite non dis- crete. 1. Undina VULGARIS. — Frons obtusa. Cephalothorax 4-articula- tus, postice rotundatus. Antennae anticae corporis longitudine, ad ar- liculum octavum leviter reflexse ; setis brevibus, seta articuli tertii longa, flexa, setis apicalibus perbrevibus, una uncinata, postica ante- penultima longiuscula, penultimis antica posticaque paulo brevioribus, hac ad extremitatem uncinulata. Abdomen 5-articuIatum. Styli cau- dales breves, seta secunda duplo longiore. Long. ^y. — Hab. in freto " Banca," juxta insulam " Sumatra " ; etiam in mari Atlantico, lat. aust. 4° - 9°, long. occ. 174-° -25°. — Lect. die 1 Mar., et diebus 9, 13 Mali, 1842. 2. Undina simplex. — Frons obtusa. Cephalothorax postice rotun- datus, 5-articulatus, articulo ultimo breviore. Antennae anticce corporis longitudine, articulo primo elongato ; setis perbrevibus, seta articuli se- cundi longiuscula, flexa, setis penultimis articuli longitudine et rectis, postica antepenultima dimidio longiore, apicalibus minutis, una un- cinata. Long. jV'- — Hah. in mari Pacifico, prope insulas " Kingsmill," et lat. bor. 25°, long, orient. 167°. — Lect. die 25 Mar., et die 14 Mail, 1841. 3. Undina inornata. — Frons rotundata. Cephalothorax postice vix acutus, 5-articulatus, articulo postico brevi. Antennae anticae cor- poris longitudine, setis perbrevibus, seta articuli secundi (tertii .') lon- giuscula, recta, seta apicali postica articuli longitudine, antica penulti- ma sublonga, postica brevi, postica antepenultima articulum vix su- perante. Styli caudales parce oblongi. Long. tV"'~ Hab. in mari Atlantico, lat. bor. 4°, long. occ. 19°. — Lect die 27 Oct., 1838. Genus V. CANDACE. (Dana.) Frons quadrata. Oculi inferiores obsoleti. Antennas anticcz regula- riter et breviter setigerae, transversae ; dextra maris articulatione ge- niculante. Maxillipedes (ct. vi.) pedibus proximis majores, duplo OF ARTS AND SCIENCES. 23 geniculantes et inflexi, 4 articulati, setis nudis, longis. Pedes postici maris dispares, dextro prehensili. Abdomen mediocre. Slyli cau- dales breves, setis stricte appressis. [Animal sjepius partim nigres- cens.] Syn. — Candace, D., Amer. Jour. Sci., Set. 2da, I. 228. 1846. 1 . Candace ornata. — Maris : Cephalothorax 5-articulatus, ar- ticulis posticis quatuor, angulis posticis longe acutis, dextro longiore. Antennse e basi arcuatae, alioque recte transversa?, corpore parce bre- viores, articulo secundo paulum oblongo ; setis brevibus, quorum pau- cis secundo articulo parce longioribus, apicali postica articuli longitu- dine, postica penultima paulo longiore, antica penultima breviore. Antennarum posticarum ramus brevis tenuis, valde brevior. Pes posticus dexter mediocris, articulo ultimo subuncinato, appendice late- rali subcornea, articulum uncinatum longitudine superante. Long. i". — Hab. in mari Atlantico, lat. bor. 9° - 7°, long. occ. 19° -21° ; etiam lat. aust. 6°, long. occ. 24°. — Lect. diebus 13, 18 Oct., 8 Nov., 1838. 2. Candace pachydactyla. — Maris : Cephalothorax 4-articula- tus, angulis posticis longe acutis et seta minuta extus instructis. An- tennae anticae ferme corporis longitudine, 23-articulatae, e basi arcuatae, deinde recte transversse ; dextra 21-articulata, medio incrassulata, ar- ticulo geniculationem prsecedente valde elongato, et versus apicem subtilissime pectinato, sequente non breviore. Antennarum posticarum rami longitudine subaequi. Pes posticus dexter crassus, apice rotunda- tus, appendice laterali crasse falcata, obtusa. Long. yij". — Hab. in mari Atlantico, lat. aust. 1° - 11°, long. occ. 14° - 30°. — Lect. diebus 7, 9, 13, 16 Maii, 1842. 3. Candace Ethiopica. — Maris : C. ornaicB antennas anticas et cephalothoracem affinis. Cephalothorax 4-articuIatus. Antennae an- licae e basi arcuatae ; articulo antennae dextrse articulationem genicu- lantem precedente omnino subtilissime pectinato. Pes posticus dexter subclavatus, obtusus, seta elongata, appendice laterali setacea, longa, cornea, flexa. Antennarum posticarum ramus brevis parvus. Long. ^y. — Hab. in mari Pacifico, lat. aust. 18°, long. occ. 124° ; lect. die 8 Aug., 1839 : lat. bor. 15°, long. 180° ; lect. Dec, 1841. 4. Candace ctjrta. — Maris : C. ornatcz similis. Cephalothorax 5-articulatus, postice acutus. Pes posticus dexter apice subulatus, ap- pendice laterali curia, spiniformi. Antennae anticae corpore parce Ion- 24 PROCEEDINGS OF THE AMERICAN ACADEMY giores, a basi arcuatas ; articulis 13, 14, 15, 16, 17 antennse dextrae in- crassulatis, articulo 17 elongato apice prominulo, partim subtilissime pectinate, sequentibus sex brevibus, et tenuissimis. Long. -ry. — Hah. in mari Pacifico prope " Valparaiso." — Lect. die 10 Ap., 1839. 5. Candace aucta. — Femince. : Cephalothorax 5 - 6-articulatus, postice subacutus aut obtusus. Antennse anticse fere corporis longitu- dine, e basi arcuatee, apice prorsum parce flexse, articulo secundo longo et crasso. Abdomen 2 - 3-articulatum. Long. tJj". — Hab. in mari Pacifico, lat. aust. 9°, long. occ. 174° ; etiam prope insulas " Kingsmill " ; quoque in mari " Sulu." — Lect. die 26 Jan., 1841 ; die 14 Ap., 1841 ; Dec, 1841 ; die 28 Jan., 1842. 6. Candace truncata. — Femince. : Cephalothorax postice trunca- tus. Antennse anticte corporis longitudine, prope articulum. sextum flexse, deinde recte transversse et tenuissimse ; articulo secundo crasso, non longiore quam articulus tertius quartusve. Long. ^y. — Hab. in mari Pacifico, prope insulas " Samoa " et " Kingsmill," et in mari " Sulu." — Lect. die 25 Mar., et die 1 Ap., 1841 ; die 2 Feb., 1842. Genus VI. CYCLOPSINA. {MUne Edwards.) Rostrum furcatum. Antenna anticcB sive rectse, sive leviter curvatae, maris dextra articulatione geniculante. Maxillipedes (ct. vi.) pedi- bus proximis majores, non geniculati, setis longis spinulosis instructi. Oculi inferiores nulli. Cephalothorax 4-7 articulatus, capite soepe discrete. Antennce fosticce. iisdem Calani similes. Pes posticus dexter maris grandis et prehensilis. [Maxillipedes, et maris anten- nam anticam dextram pedemque posticum dextrum, PontellcB afiinis ; antennam posticam, oculos, et habitum, Calano similis. Si oculi in- feriores adsunt, species Pontellm pertinent.] Syn. — Cyclopsina (C. castor), Milne Edwards. — Cetochilus? Roussel de Vauzkme. — Monoculus (M. Castor), Jurine. — Cyclops (C. castor), Desmarest. — Dioptomus (D. castor), Westivood. — Non Cyclopsina Bairdii. 1. Cyclopsina longicornis. — Frons rotundata. Ceplialothorax postice obtusus, 5-articulatus, articulis posticis acquis. Antenna3 anticas sesqui corporis longitudine, rectiusculas, setis brevibus, duabus subapi- calibus posticis prselongis, subaequis, apicalibus perbrevibus, antica pe- nultima articuli longitudine. Styli caudales breves. OF ARTS AND SCIENCES. 25 Long. ^". — Hob. in mari Atlantico, lat. aust. 4°, long. occ. 21°. — Lect. die 7 Nov., 1838. — An Cetochilo septentrionali (Goodsir) affinis? 2. Cyclopsina calanina. — Gracilis. Frons triangulata. Cepha- lothorax postice obtusus, 6-articulatus, capite vix discreto, articulis pos- ticis acquis. Antennae anticse corpore longiores, tenuissimce, rectiuscu- Ids, apicibus fronte non posteriores ; setis brevibus, apicalibus anticis articuli longitudine, subapicalibus totis valde brevioribus ; antenna 77ia- ris dextra medio leviter incrassata. Styli caudales elongati, divaricati. Long. y\y", — Hab. in mari Pacifico, prope insulam " El Gran Ce- cal."—Lect. die 25 Mar., 1841. 3. Cyclopsina tenuicoknis. — Maris : Frons triangulata. Ce- phalothorax postice fere obtusus, 7-articulatus, capite discreto, articulis posticis Kquis. Antennae anticce corpore longiores, apicibus fronte vix anteriores, tenuissimse, rectiusculEe, setis brevibus, anticis apicalibus fere articuli longitudine, postica penultima paulo longiore. Abdomen 3- articulatum. Styli caudales elongati divaricati. Long. Jg-". — Hah. in mari Pacifico, prope insulam " Depeyster " ; lect. die 22 Mar., 1841. Etiam (?) in Archip. " Paumotu " ; lect. Aug. 13, 1839. 4. Cyclopsina gkacilis. — Maris : Antennae anticse corpore valde longiores ; abdomen 4-articulatum ; aliis C. tenuicorni similis. Long. -j-y. — Hab. in mari Pacifico, lat. bor. 25°, long, orient. 167°. — Lect. die 14 Mali, 1841. — An var. C. tenuicornis. Genus VII. CATOPIA. Antennas posticas et antennarum habitum anticarum Colano affinis. Antennam anticam maris dextram PontellcB affinis. Oculi superi- ores nulli ; oculus inferior unicus (?). Catopia furcata. — Gracilis. Caput quadratum, non discretum. Cephalothorax 4-articulatus, postice 4-dentatus, dentibus acutis, exter- nis longioribus. Styli caudales oblongi, divaricati. Antennae anticae corpore longiores, duplo curvatae, apicibus fronte non anteriores ; setis totis brevibus. Long. tV'- — Hab. in freto " Banka." — Lect. die 2 Mar., 1842. Genus VIII. ACARTIA. {Dcma.) Antennce anlicoe, rectiuscute, flexiles, setis irregulariter diffijsis, dextra maris non geniculante. Maxillipedes (ct. vi.) pedibus proximis ma- jores, recti, setis setulosis longis instructi. Pedes postici (ct. xii.) VOL. II. 4 26 PROCEEDINGS OF THE AMERICAN ACADEMY parvuli, uni-articulati, 2 setas divaricatas gerentes. Oculi duo infe- riores et duo superiores. Setce caudales mediocres. 1. AcARTiA LIMPIDA. — Gracilis. Frons triangulata. Cephalotho- rax postice obtusus, 5-articulatus, capite discreto. Antennaj anticse late divaricatae, rectiuscultE, vix corporis longitudine, 7-8-articulata3, articulis ultimis tribus brevibus, precedentibus longis ; setis praelongis, penultima postica dimidio breviore quam apicales. Styli caudales ob- longi, tenues. Long. 217". — Hub. prope Patagoniam. — Lect. diebus 14, 15 Jan., 1839. 2. AcARTiA NEGLiGENS. — GracilUma. Frons triangulata. Cepha- lothorax angustus, postice minute apiculatus, capite fere discreto. An- tennae anticae fere corporis longitudine, tenuissimae, latissime divari- catae, apicibus fronte paulo anteriores, 7 - 9-articulatae, articulis tribus ultimis brevibus ; setis praelongis, postica penultima apicales aequante. Styli caudales tenuissimi, oblongi, setis late divaricatis. Long. -j^-^". — Hab. in mari Pacifico, prope insulas " Kingsmill," et lat. bor. 28°, long, orient. 171°. — Lect. diebus 15 Ap., et 17 Mali, 1841. 3. AcARTiA TONSA. — Frons rotundata. Cephalotborax postice ob- tusus, 6-articulatus, capite discreto. Antennae anticse multiarticulatae, rectae, apicibus fronte non anteriores, setis plerumque brevibus, pau- cis longiusculis (3 - 4-articulos simul sumtos longijudine aequantibus). Styli caudales perbreves. Long. yV'- — H'^^' i" " ^'^^^ Jackson" Novi-Hollandiae. — Lect. Mar., 1840. . 4. AcARTiA LAXA. — Gracilis. Frons rotundata. Cephalotborax 4- articulatus, capite non discreto, postice longe acutus. Antennae an- ticae, rectiusculae, corpore paulo longiores, nusquam fronte anteriores, multiarticulatae, articulo primo longiore, setis longiusculis, valde inas- quis. Abdomen breve. Styli caudales paulum oblongi, setis latissime diffusis, abdomine non longioribus. Long. j\". — Hab. in mari " Sulu," et freto " Banka." — Lect. diebus 2 Feb., et 2 Mar., 1842. Genus IX. PONTELLA. Rostrum furcatum. Oculi duo superiores, pigmentis sive coalitis sive remotis ; duo inferiores coaliti. Anienncs anticcB multiarticulatae, setis non diffusis, antenna dextra maris geniculante. Cephalo- OF ARTS AND SCIENCES. 27 thorax 4 - 7-articulatus, segmento cephalico ssepe discrete. Max- iUipedes (ct. vi,) grandes, recti, setis longis, setulosis. Pedes aniici (ct. vii.) minores. Pes posticus (ct. xii.) dexter maris crassus, pre- hensilis. Syn. — Pontia, Milne Edwards.* — Irenaeus, Goodsir. — Broteas, Lovin. I. PONTELLJE CALANOIDEjE. AnTENN^ AntIC^ DUPLO CURVATjE, AD APICES FRONTE NON ANTERIORES. AwTENNiE PoSTICJS, AD APICEM •RAMI MINORIS, 3-SETIGER^. 1. PoNTELLA ELLiPTicA. — FemiiKB : Frons rotundata. Cephalo- thorax crassus, 4-articulatus, capite inermis, angulis posticis acutis, re- motis. Oculi superiores remotiusculi, inferiores minuti. Antennae anticae duplo curvaia^, apicibus fronte valde posterioribus, corpora bre- viores, setis brevibus, subapicalibus perbrevibus, apicalibus vix articuli longitudine. Styli caudales oblongi, setis valde insequis. (Cserulea, dorse saepe argentea.) Long. yV'. — Hah. in freto " Banka." — Lect. die 2 Mar., 1842. 2. PoNTELLA BRACHiATA. — Maris: Frons subtriangulata. Cepha- lothorax 6 -7-articulatus antice angustior, inermis, angulis posticis acu- tis, remotis. Oculi superiores remotiusculi aut coaliti. Antennae anti- cae corporis longitudine, duplo curvatse, apicibus fronte non anterioribus, setis brevibus, postica penultima articulum longitudine fere duplo supe- rante, antica apicali breviore, aliis apicalibus et subapicalibus breviori- bus ; antenna dextra medio paulum incrassata, fere 23-articulata, dua- bus articulis medianis antice unidentatis, articulo antepenultimum prse- cedente elongate, duplice. Pes posticus dexter maximus, digito elonga- te, recte inflexo. Long. yV'. — Hal. in mari Pacifico, lat aust. 42°, long. occ. 78° 45'; lect. die 3 Ap., 1839. In syrtis " Lagulhas " ; lect. die 8 Ap., 1842. — FemincB (an ejus specie! .'') frons vix triangulata ; styli caudales divaricati ; abdomen 3-articulatum [maris 4) ; anguli postici cephalo- theracis divaricati. — Lect. in syrtis " Lagulhas " die 8 Ap., 1842. II. Antenna AnticjE ad apices fronte anteriores. A, Caput laterihus inerme. I. Cephalothorax postice obtusus aut brevissime acutus. 3. Pontella plumata. — Femince : Frons rotundata. Cephalo- * Pontia Papilionum generis vocabulum, itaque Pontella hie scripsa. 28 PROCEEDINGS OF THE AMERICAN ACADEMY thorax curtus, obesus, 6-articulatus, capite discrete, segmento postico perbrevi, et posticc vix acuto. Antenna) antics) corpore paulo longiores, late divaricata), fere recta;, setis raris sublongis, apicalibus arliculo plus duplo longioribus, subapicalibus brevioribus. Antenna) posticae ramos valde intequa), setis ramorum et palporum sequentium fere corporis lon- gitudine, instar plumarum. Styli caudales parce oblongi. Long. jV. — Hah. in mari Atlantico, lat. bor. 5°, long. occ. 21°, 4. PoNTELLA TURCICA. — Frons rotundata. Cephalothorax crassus, obesus, 5-6 articulatus, capite discretus, postice obtusus. Oculi su- periores approximati. Antennae anticae corporis longitudine, ferme 21- articulata), 60° -90° divaricatae et prope medium obsolete reflexae ; se- tis brevibus, penultima postica longiore quam apicales aut alise subapi- cales. Antennae posticae ramos valde inaequae, setis longis. Styli cau- dales oblongi. — Maris antenna antica dextra 10- 12-articulata, articulo subniediano late subovato et apice acuto, articulis tribus sequentibus valde elongatis, ultimo triplice. Long. 2-^j". — Hal), in mari Atlantico, lat. bor. 8^° - 0°, long. occ. 23°- 18° ; lect. diebus 15, 22, 23, 26 Oct., 1838. Lat. aust. 1° -4^°, long. occ. 174-° - 2U° ; lect. diebus 5, 6, 7 Nov., 1838. Lat. aust. 4° 30', long. occ. 25° ; lect. die 13 Mali, 1842. Lat. bor. 0° 15', long, occ. 31°; lect. die 17 Maii, 1842. In mari Pacijico prope insulas "Kingsmill"; lect. diebus 13, 28 Ap., 1841. In syrtis " Lagul- has " ; lect. die 8 Ap., 1842. 5. PoNTELLA cuRTA. — Frons Totundata. Cephalothorax curtus, crassiusculus, 5-articulatus, capite discrete, angulis posticis brevissime acutis. Antennae anticae corpore breviores, rectae, 105° divaricatae, setis brevibus, apicali antica longiore. Antennae posticae ramos valde inaequae, minore plus dimidio breviore. Styli caudales oblongi, non divaricati. Long. ^y. — Hah. prope insulam " Mindoro " et in freto " Sun- da"; lect. diebus 24 Jan. et 4 Mar., 1842. In syrtis "Lagulhas"; lect. die 8 Ap., 1842. 6. PoNTELLA coNTRACTA. — Frons rotundata. Cephalothorax 6-7- articulatus, capite discrete, angulis posticis brevissime acutis, segmento postico fere obsolete. Antennae anticae cephalothorace non longiores, 100° - 110° divaricatae, rectae, ferme 17-articulatoe, setis brevibus, api- cali antica longiore. Rami antennarum posticarum valde inaequi. Styli caudales elengati. [Abdomen 2-articulatum.] Long. I'j". — Hah. in mari Pacifico, lat. aust. 18J-°, long. occ. 124° OF ARTS AND SCIENCES. 29 30'; lect. die 7 Aug., 1839. An eadem species in mari Atlantico, lat. aust. 2°, long. occ. 20° ; lect. die 6 Nov., 1838. 7. PoNTELLA MEDIA. — Frons rotundata. Cephalothorax 5-articula- tus, segmento postico brevissimo et valde angusto, non acute, capite vix discreto. Oculi superiores remotiusculi, inferiores parvuli. Anten- nae anticae corporis longitudine, duplo curvatae, fere transversa, aplci- bus fronte anteriores, setis brevibus, rectis, apicalibus articuli longitu- dine, postica penultima parce longiore, aliis subapicalibus brevioribus. Styli caudales oblongi. [Abdomen 2-articulatum.] Long. 2-V". ~ Hub. in mari " Sulu " ; lect. die 27 Jan., 1842. 8. PoNTELLA CRISPATA. — FemincB : Frons subtriangulata, obtusa. Cephalothorax 7-articulatus, segmento postico brevissimo, obtuso aut subacuto. Oculi superiores remotiusculi, inferiores mediocres. Anten- nse anticae vix corporis longitudine, late divaricatae, apicibus fronte valde anterioribus. et prorsum curvatis ; setis brevibus, prope basin confertis et paucis uncinatis, apicalibus et postica antepenultima articulo parce longioribus, postica penultima paulo longiore. Styli caudales parce oblongi, setis subaequis. [Abdomen 4-articulatum.] Long. ^^". — Hah. in mari Pacijico, prope insulas "Kingsmill"; lect. diebus 22, 26 Mar., 1841. In mari Atlantico, lat. bor. 8^-°, long. occ. 23° 45' ; lect. die 15 Oct., 1838. 9. PoNTELLA DETRUNCATA. — Frons obtusa. Cephalothorax 5-6- articulatus, capite discreto, angulis posticis recte truncatis et extus bre- vissime acutis. Antennae anticae 22-24-articulatae, vix corporis longi- tudine, late divaricatae, apicibus fronte valde anterioribus et prorsum curvatis ; setis brevibus, rectis, postica penultima longiore quam apica- les vel aliae subapicales. Styli caudales breves. Antenna dextra maris, medio incrassata, subteres, 12 - 13-articulata, articulo tertio elongate, obsolete articulato, septimo (octavo.?) brevi et subtriangulato duabus sequentibus tenuibus, longis. Pes posticus dexter 7naris crassissime cheliformis, manu subovata, pollice lateral!, obtuso, dimidio breviore, digito elongate, tenui et curvato. Long, ^y - x'y". — Hub. in mari Pacifico, lat. aust. 26° 8', long, occ. 178° ; lect. die 18 Ap., 1840. Lat. aust. 5° 20', long, orient. 175° 30' ; lect. die 25 Mar., 1841 : etiam prope insulas " Kingsmill." 10. PoNTELLA siBiPLEX. — Frons obtusiuscula. Cephalothorax sub- gracilis, capite obsolete discreto, segmento postico brevi et perangusto. Oculi superiores, subremoti, inferiores mediocres. Antennae anticae 30 PROCEEDINGS OF THE AMERICAN ACADEMY cephalothorace breviores, 9-articulat3e, 100° divaricatae ; setis totis bre- vibus. Styli caudales elongati. [Abdomen 2-articulatum. An speci- men adultum ?] Long. 2V"- — Hob. in mari Pacifico, lat. aust. 32° 24', long, orient. 178°. — Lect. die 9 Ap., 1840. 11. PoNTELLA ExiGUA. — Gracilis. Frons obtusa. Cephalothorax 6-articulatus, capita discreto, segmento postico brevi, obtuso. Oculi inferiores maximi, valde elongati, subclaviformi. Antennse anticae corpore valde breviores, 120° (?) divaricatae, setis perbrevibus, apicali antica longiore, subapicalibus brevibus. Antennae posticae tenues, ra- mo majore plus duplo longiore. Styli caudales oblongi. [An adultum ? Abdomen 2-articulatum.] Long. ^y. — Hab. in mari Atlantico, lat. bor. 7^° et 4|°, long. oec. 23f° et 19° ; lect. diebus 16, 24 Oct., 1838. 2. Cephalothorax postice productus et acutus. * Seta antennarum anticarum apicalis setis subapicalibus brevior. 12. PoNTELLA AGiLis. — Fcmincz : p. crispatce antennas similis. Anguli postici cephalothoracis acuti, fronte rotundata. Setae antenna- rum anticarum fere rectae prope basin confertae. — Forsan P. crispatcB cephalothorax interdum postice acutus et species non difTert. Long. ^". — Hah. in mari Atlantico, lat. aust. 19^°, long. occ. 38f ° ; lect. die 17 Nov., 1838 : etiam (.?) lat. bor. 9^°, long. occ. 24° 18'. 13. PoNTELLA ACUTIFRONS. — Maris : p. crispatcE. et agili similis. Anguli postici cephalothoracis acuti. Frons acuta et prominens ; ros- tro longissime furcate et valde inflexo. Setae antennarum anticarum rec- tae, prope basin fere articuli secundi longitudine, postica penultima plus duplo longiore quam apicales. Antenna dextra medio incrassulata, sub- teres 12- 13-articulata ; articulis secundo et quinto aequis, septimo bre- vissimo, octavo valde elongate, subattenuato, recto, fere duplo longiore quam none ; nono ad apicem anticam instar spinae valde producto ; ar- ticulis sequentibus (ultimis) tribus, normalibus. Pes posticus dexter latissime cheliformis, manu subquadrata, poUice breviter spiniformi, di- gito recto, apice minuto inflexo, valde breviore quam manus. Long. \". — Hah. in mari Pacifico, prope insulam " El Gran Co- ca]," lat. aust. 5° 40', long, orient. 175° 30' ; etiam prope insulas " Kingsmill "; lect. diebus 25 Mar., 1 Ap., 1841. 14. PoNTELLA ACUTA. — Frons longe acuta, roslro brevi, vix inflexo. OF ARTS AND SCIENCES. 31 Cephalothorax 5-articulatus, capile discrete, angulis posticis elongatis, acutis. Oculi superiores remoti, inferiores parvi. Antennae anticae subtransversae, fere corporis longitudine, ferme 21 -22-articulatae, api- cibus fronte paulo anterioribus, et prorsum leviter curvatis, setis prope basin confertis longiusculis, postica penultima duplo longiore quam ar- ticulus, apicalibus et aliis subapicalibus brevioribus. Styli caudales oblongi. Antenna dextra maris subteres, ferme 13-articulata, articulo secundo longo, 6 sequentibus brevibus, proximis duobus elongatis et tenuibus, parce arcuatis, subaequis, 3 proximis (ultimis) normalibus. Pes posticus dexter maris latus, manu apice late orbiculata, pollice nul- lo, digito vix manus longitudine, paulum inflexo, [Cyanea. Abdomen 4-articuIatum.] Long. yV- — -HaS. prope insulam "• Mindoro " ; lect. die 24 Jan., 1842. In mari Sinensi ; lect. die 15 Feb., 1842. t Seta antennarum anticarum apicalis subapicalibus longior. 15. PoNTELLA RUBESCENS. — Femincz : Frons rotundata. Cepha- lothorax 6-articulatus, capita discrete, segmento septimo obsoleto, angu- lis posticis acutis. Oculi superiores remoti ; inferiores pigmentum bi- lobati. Antennae anticae fere 120° divaricatae et rectae ; setis brevi- bus, apicali vix longiore quam articulus. Ramus major antennarum posticarum fere triplo longior. Styli caudales elongati, paralleli. [Abdomen 3-articulatum.] Long. ^y. — Hah. in mari Pacifico, prope insulam " Upolu " ; lect. die 24 Feb., 1841. Prope insulam " El Gran Cecal"; lect. die 25 Mar., 1841. 16. PoNTELLA EBiERiTA. — FemincB : Crassa. Frons obtusa. Ce- phalothorax 6-7-articulatus, capite discrete, angulis posticis longe acu- tis, segmento postico brevi. Oculi superiores remoti. Antennae anti- cae cephalothorace vix longiores, ferme 100° divaricatas, rectae. Ra- mus major antennarum posticarum fere quadruple longior. Styli cau- dales breves. [Abdomen 2-articulatum segmentis subaequis.] Long. y'ij". — Hab. in mari prope Promenterium Bonae Spei ; lect. die 12 Ap., 1842. 17. PoNTELLA REGALis. — FemincB : Crassissima. Frons rotunda- ta. Cephalothorax 5 - 6-articulatus, angulis posticis lenge acutis, capite discrete brevi. Oculi superiores remoti, inferiores parvi. Antennae anticae cephalothorace brevieres, 100°- 110° divaricata3, duple leviter curvatae. Ramus major antennarum posticarum quadruple longior. 32 PROCEEDINGS OF THE AMERICAN ACADEMY Styli caudales brevissimi. [Abdomen 2-articulatum, segmento secundo brevi.] Long. \". — Hah. in mari " Sulu " ; lect. die 27 Jan., 1842. 18. PoNTELLA PERSPiCAX. — Frons rotundata. Cephalothorax 6-ar- ticulatus, capita discrete, segmento postico non breviore, angulis posti- cis longe acutis. Oculi inferiores grandes et prorsum valde elongati. Antennse anticae corpore valde breviores, 100° - 110° divaricatfe, ferme 21-articulatce, ante medium obsolete flexee. Styli caudales elongati. Antenna antica dextra maris 9- 10-articulata,.articulo quarto lato, sub- ovato. Pes posticus dexter vix crassus ; manu angusta, breviuscula, digito vix longiore acuminate, pollice setiformi, longissimo, reflexo. [Abdomen 5-articulatum.] Long. xV"' — ^^^- i'^ "^^i^i Atlantico, lat. aust. 0° 40', long. occ. 18° ; lect. die 3 Nov., 1838. Forsan, lat. bor. 7° 25', long. occ. 20° ; lect. die 17 Oct., 1838. 19. PoNTELLA STRENUA. — MaHs : Frons acutiuscula. Cephalo- thorax 5 - 6-articulatus, angulis posticis longe acutis, capite discrete. Oculi superiores remoti, inferiores mediocres. Antennae anticae fere corporis longitudine, 80° - 90° divaricatse, 17 - 18 articulatse, ad me- dium obsolete flexse. 'Ramus major antennarum posticarum fere triplo longior. Styli caudales breves. Antenna antica dextra maris 12 - 14- articulata, articulo mediano subovato, apice antico acute. Pes posticus dexter crassiusculus, manu ovali, breviore quam carpus, pollice tenuis- sime, acute, parce longiore, digito mediocri, subulate, rectiusculo. [Ab- domen 5-articulatum.] Long. -jL''. — Hah. in mari Pacifico, lat. aust. 3°, long, orient. 175°. 20. PoNTELLA PROTENSA. — Maris : Crassa. Frons rotundata. Ce- phalothorax 5- 6-articulatus, capite discrete, brevi, angulis posticis leng6 acutis. Oculi superiores remoti, inferiores mediocres. Antennce anticae basi vix 60° divaricatae et medio fere 70°. Ramus antennarum postica- rum major plus quadruple longior. Styli caudales oblongi. Antenna maris antica dextra P. strenuce similis. [Abdomen 5-articulatum.] Long. yV'. — Hah. in fretis " Banka " et " Sunda " ; lect. diebus 1, 4 Mar., 1842. B. Caput laterihus armatum. 21. PoNTELLA HEBKs. — FemincB : Frons truncata. Cephalotho- rax 4-articulatus, postice rotundatus. Oculi superiores disjunct), infe- OF ARTS AND SCIENCES. 33 riores parvi. Antennae anticae fere corporis longitudine, transversse, apicibus fronte paulo anterioribus, prorsum parce curvatis, prope basin setis confertis longiusculis, et una sublonga mobili. Setis apicalibus ar- ticuli longitudine, postica penultima paulo longiore, aliis subapicalibus brevibus. Styli caudales vix oblongi. [Abdomen 3-articulatum.] Long. ^^". — Hab. prope insulam "Sumatra"; lect. die 3 Mar., 1842. 22. PoNTELLA FRivoLA. — FemiTKE P. hehetis similis. Sed cephalo- thorax postice acutus ; abdomen 4-articulatum. An species differt ? — Lo7ig. yV'- Hab. prope insulam " Sumatra"; lect. die 3 Mar., 1842. Maris (an hsec species?) antenna antica dextra 9-articulata, subte- res, incrassulata, articulis 2, 3, 4, 5, 6 totis longis, 3 sequentibus (ulti- mis) normalibus, arliculo quarto longiore et crassiore, subcylindrico. Antennse posticse tenuissimae, ramis fere Eequis. Abdomen 4-articula- tum, tenue ; stylis parce oblongis. Anguli postici cepbalothoracis acu- ti, dextro longiore. — Long. ^y. Hab. in marl " Sulu" ; lect. die 28 Jan., 1842. 23. PoNTELLA DETONSA. — Caput discrctum, subtriangulatum, fronte cbtusiuscula. Cephalothorax 7-articulatus, segmento septimo brevissi- mo, postice obtuso aut obtusiusculo. Oculi superiores remoti, inferio- res subgrandes, vix elongati. Antennae anticas cephalothorace brevio- res, rectse, fere 100° divaricatse, 20-22-articulat8e, setis totis perbrevi- bus. Styli caudales elongati, vix divaricati. Antenna dextra maris paululum incrassata, teretiuscula, ferme 20-articulata. [Cyanea ; in- terdum dorso margaritacea. Abdomen 3-articulatum.] Long.y-^-^". — Hab. in mari Pacifico, lat. aust. 18° 10', long, occ 125° 20' ; lect. die 8 Aug., 1839. Lat. aust. 12° 45', long. occ. 171° ; lect. die 5 Feb., 1841. Lat. aust. 11°, long. occ. 170° ; lect. die 1 Feb., 1841. Lat. aust. 5° 30', long, orient. 175° 50', prope insu- lam " El Gran Cecal " ; lect. die 25 Mar., 1841. Prope insulam " Mindoro " ; lect. die 24 Jan., 1842. 24. PoNTELLA ARGENTEA. — Caput discrctum, subtriangulatum, fron- te obtusum. Cephalothorax 5 (-6)-articulatus, postice brevissime acutus articulis tribus posticis suboequis. Oculi superiores remoti, inferiores subgrandes non elongati. Antennae anticse cephalothorace breviores, fere 90° divaricatse et levissime incurvatre, 18 - 20-articulat3e, setis to- tis perbrevibus, duabus apicalibus subuncinatis. Styli caudales parce oblongi. [Viridescens, dorso argentea. Abdomen 3-articulatum.] VOL. II. 5 34 PROCEEDINGS OF THE AMERICAN ACADEMY Long. xV- — Hah. in mari Atlantico, lat. aust. 40° 35', long. occ. 60°, prope " Rio Negro." — Lect. die 24 Jan., 1839. 25. PoNTELLA sPEciosA. — Caput discretum, subtriangulatum', fronte obtusum. Cephalothorax 5-7-articulalus, postice acutus aut obtusius- culus. Oculi superiores remoti, inferiores mediocres. Antennae anticse cephalothoracis longitudine, fere rectse, prope 110° divaricatse, 21 -22- articulatae ; setis brevibus, apicali antica et penultima postica longiori- bus, articulum paulo superantibus. Styli caudales oblongi. Antenna dextra maris pauci-articulata, articulo quinto late ovato. Pes posticus dexter maris crassus, manu lata apice truueata et obtuse dentata, pol- lice e basi manus producto, elongato, spiniformi, digito prselongo, incur- vato. l^Maris cephalothorax 6-articulatus, et abdomen 4-articulatum ; color viridis, dorso argenteus. FemincR cephalothorax 7-articulatus, segmento ultimo brevissimo ; abdomen 3-articulatum ; color ochreus, medio Isete ruber.] Long. Jj", — Hob. prope fretum Sundse ; lect. die 4 Mar., 1842. 26. PoNTELLA PRiNCEPS. — FemiucB : Caput discretum, subtriangu- latum, fronte obtusiusculum. Cephalothorax 6-articulatum, postice lon- ge acutus, articulis tribus posticis subasquis. Oculi superiores remoti ; inferiores mediocres parce elongati. Antennse anticce cephalothorace parce breviores, rectiusculse, ferme 110° divaricatas, setis brevibus, api- cali antica longiore. Styli caudales perbreves. [Cyanea, dorso mar- garitacea. Abdomen 4-articulatum, distortum.] Long. ^". — Hah. in mari Pacifico, prope insulam " Tongatabu " ; lect. die 29 Mar., 1840. 27. PoNTELLA FERA. — Caput vix discretum, subtriangulatum, fronte rotundatum. Cephalothorax 6 - 7-articulatus, postice obtusus aut obtusi- usculus, segmento postico brevissimo. Oculi superiores remoti, inferi ores grandes, non elongati. Antennse anticae vix cephalothoracis Ion gitudine, ferme 21-articulatae, 130° divaricatse, setis prope basin sub longis, confertis, aliis brevibus, apicali antica et penultima postica ar ticulo vix longiore. Styli caudales elongati, divaricati. Antenna an tica dextra maris subteres 11 - 12-articulata, articulo secundo longo tertio brevissimo, quarto sub quintum producto, proximo spinam inver sam ferente. Pes posticus dexter maris tenuis, manu subcylindrica digito tenuissimo, ad apicem spatulato et concavo. Long. -j-y. — Hah. in mari Pacifico, lat. aust. 11° - 12° 45', long, occ. 170° - 171° ; lect. diebus 1, 5 Feb., 1840. OF ARTS AND SCIENCES. 35 Familia IV. CORYC^IDiE. Oculi duo grandes plus minusve remoti, lenticulls duabus prolatis max- imis, et cornels oblatis instar conspicillorum, construct! ; quoque duo oculi connati minutissimi. Antennce anticce pauci-articulatse, simplicissimge. Antennce. posticcE simplicissimse. Pedes mandibu- lares maxillaresque brevissimi. Sacculi ovigeri duo. Genus I. CORYC^US. Corpus crassum, antice rotundatum. Conspicilla fronte affixa. An- tennce. posticcB pedibus anticis majores. Pedes antici sexu vix dissi- miles digito subuncinato tenuique confecti. Abdo7ncn pauci-articula- tum, appendicibus basi nuUis, stylis caudse styliformibus. 1. ANTENNJi POSTIC^ MACRODACTYLiE, DIGITO NON BREVIOKE QUABI CARPUS.* A. Seta; caudales stylis valde hreviores. [ Cephalothorax postice {ad segmentum tertium) acutus, segmento quarto minore.] 1. CoRYC^us GRACILIS. — Ccphalothorax gracilis, ventre non cari- nato. Antennae anticae breviter setulosce. Conspicilla fere contigua. Antennarum posticarum carpus digito brevior, seta longa, setulosa. Abdomen uni-articulatum, apice subcylindrico fere triple longius, basi angustum. Styli caudales abdomine breviores, setis brevissimis. Long. -g^ij". — Hab. in mari Allantico, lat. bor. 1° 30', long. occ. 18° 20', et lat. aust. 2° 20', long. occ. 20°. 2. CoRYC^us DECURTATUS. — Cephalothorax ventre carinatus. An- tennae anticae breviter setulosae. Conspicilla fere contigua. Antenna- rum posticarum carpus digito brevior seta nuda elongata, etiam seta altera setulosa breviore. Abdomen basi crassum, apice subcylindrico fere quadruple longius. Styli caudales vix dimidii abdominis longitu- dine, setis brevissimis. Hab. in mari Pacifico, prope insulam " Duke of Clarence." 3. CoRYC^TTS DEPLUMATUS. — Conspicilla remotiuscula. Antennee anticae brevissime setulosae, 7-articulatae. Antennarum posticarum car- * Carpus est articulus elongatus antennarum posticarum secundus (aut primus et secundus simul sumti). Digitus articulis tertio qiiartoque compositus, plus minusve discretis. Carpus seta longa sive nudi sive setulos^ ad basin ornatus, et sspe un4 duabusve lateralibus aut apicalibus. 36 PROCEEDINGS OF THE AMERICAN ACADEMY pus digito brevior, seta setulosa longa, et alia nuda. Abdomen uni- articulatum, tenue. Styli caudales vix dimidii abdominis longitudine ; setis plus dimidio brevioribus, Hab. in mari Atlantico, lat. bor. 9° 20', long. occ. 24° 15'. 4. CoRYCiEUS VARius. — Cephalolhorax crassus. Conspicilla remo- tiuscula. Antennae anticse longe setulosse. Antennarum posticarum carpus digito brevior, seta longa, nuda. Abdomen 2-articulatum, seg- inento secundo cylindrico, breviore quam primum. Styli caudales ab- domine paulo breviores, setis dimidio brevioribus. Long. 2V"- — Hab. in mari Atlantico, lat. bor. 7° 25', long. occ. 22° ; lat. aust. l°-7°, long. occ. 18° -21°. In mari Pacifico, lat. aust. 15° 30', long. occ. 138° 30' ; lat. aust. 33°, long, orient. 153° 30', prope Australiam ; quoque prope insulas " Ladrones." 5. CoRYC^trs LONGiSTYLis. — Cephalothorax crassus. Conspicilla remotiuscula. Antennse anticae longe setulosse. Antennarum postica- rum carpus digito vix brevior, ad apicem internum dentiformis, nudus et acutus, seta basali longa, nuda ; digito setam nudam ad basin ferente. Abdomen uni-articulatum, dimidio apicali cylindrico. Styli caudales tenues, abdomine valde longiores, setis perbrevibus. Long. y\f". — Hab. in mari Sinensi. B. Setce. caudales stylis non valde breviores, scepe longiores. * Cephalothorax postice obtusus. 6. CoRYCXus OBTUSUS. — Conspicilla lata. Antennae anticae tenues, setis longiusculis. Antennarum posticarum carpus digito non brevior, seta longa nuda. Abdomen 2-articulatum, subtus ad basin apiculatum, segmento secundo dimidium primi longitudine superante. Styli cau- dales dimidii abdominis longitudine, setis stylo parce longioribus. Long. ^L". - — Hab. in mari Pacifico, prope insulam " El Gran Ce- cal." f Cephalothorax postice acutus. 7. CoRYC^us CRASSiuscuLUS. — Cephalothorax crassiusculus, seg- mento quarto postice subacute. Conspicilla contigua. Antennarum posticarum carpus digito vix brevior, seta nuda. Abdomen uni-articu- latum, apice subcylindrico fere dimidio breviore quam pars basalis el- liptica. Styli caudales dimidium abdominis longitudine superantes, setis paulo longioribus. Long. jV'. — Hab. in mari " Sulu," prope insulam " Panay." OF ARTS AND SCIENCES. 37 8. CoRYC-EUS LATiCEPS. — Ccphalothorax crassus, segmento quarto breviter acuto. Conspicilla remotiuscula. Antennae anticae 7-articula- tae, setis dimidio brevioribus. Antennarum posticaruni carpus digito paulo brevior, seta longa, nuda. Abdomen 2-articulatum ; segmento secundo cylindrico, dimidio breviore. Styli caudales dimidio abdomi- nis breviores, setis parce longioribus. Long. ^jj". — Hab. in mari Atlantico, lat. bor. 4° - 5°, long. occ. 19° - 22°, et lat. aust. 0° 15' - 1°, long. occ. 18° 30', et 31°. 9. CoRYC^us viTREUs. — Cephalothorax crassus, segmento quarto brevissime acuto. Conspicilla remotiuscula. Antennae anticse longe setulosae. Antennarum posticarum carpus digito vix brevior, seta nu- da, longa. Abdomen 2-articulatum, apice cylindrico brevi. Styli cau- dales dimidii abdominis longitudine, setis stylos paulum superantibus. Long. yV'- — H*^^- ^^ ^^^^ Pacifico, lat. aust. 18°, long. occ. 124° 30'. 10. CoRYC^us AGiLis. — Ccphalothorax crassiusculus, segmento quarto subrectangulato. Conspicilla remotiuscula. Antennas anticae breviter setulosae. Antennarum posticarum carpus digito paulo bre- vior, seta longa, nuda. Abdomen 2-articulatum, crassum, segmento secundo tenuiter subcylindrico, paulo breviore quam primum, Styli caudales tenuissimi, dimidio abdominis longiores, seta paulo breviore. Long. Tjy. — Hab. in mari Pacifico, prope insulam " Tongatabu." 11. CoRYC^us ORiENTALis. — Cephalothorax crassus, segmento quar- to rectangulato, subacuto. Conspicilla remota. Antennae anticae bre- viter setulosae. Antennarum posticarum carpus digito paulo longior, seta longa, nuda, digito articulis duabus subsequis composite. Abdomen 2-articulatum, ad basin infra rectangulatum. Styli caudales breves, setis vix longioribus. Long. ^-q". — Hab. in mari " Sulu," prope insulam " Panay.^' 2. Antennje Postic^ microdactylje, digitus carpo brevior. A. Seta carpi antennarum posticarum nuda. * Styli caudales abdomine non breviores. Digitus carpo paulo brevior. 12. CoRYC^us LAUTUS. — Cephalolhorax ad segmentum quartum ob- tusus. Conspicilla remotiuscula. Antennae anticae longissime setulo- sae. Antennarum posticarum carpus digito paulo longior, seta longa, nuda, digito subaequ^ 2-articuIato, et ad basin setam nudam longam fe- 38 PKOCEEDINGS OF THE AMERICAN ACADEMY rente. Abdomen 2-articulatum, segmentis fere aequis. Styli caudales tenuissimi, abdomine valde longiores, setis perbrevibus. Long. ^y. — Hah. in mari Pacifico, prope insulas " Kingsmill." Digitus carpo valde brevior, uncinatus. 13. CoRYC^us spEciosus. — Cephalothorax ad segmentum quartum longe acutus. Conspicilla non contigua. Antennse anticae setis longis- simae. Abdomen 2-articulatum, articulo primo crasso, secundo cyliii- drico, dimidio breviore. Styli caudales abdomine longiores, divaricati, setis brevibus. [Pedes biremes 4 posteriores utrinque protensi.] Long. -j-y. — Hah. in mari Atlantic©, lat. bor. 5° - 7°, long. occ. 21° -22°. 14. CoRYCiEus REMiGER. — Cephalothorax ad segmentum quartum longe acutus, Conspicilla remota, parvula. Antennse anticce setis lon- gissimae. Abdomen 3-articulatum, segmento ultimo subito angustiore, cylindrico. Styli caudales ferme abdominis longitudine, divaricatae, se- tis stylo paulo brevioribus. (C specioso pedes biremes similis.) Long. ^y. — Hah. in mari Atlantico, lat. aust. 11°, long. occ. 29°. t Styli caudales abdomine breviores. [Cephalothorax postice (ad segmen- tum tertium) longe acutus.] 15. CoRYc^us LATUS, — Cephalothorax crassus, segmento quarto postice longe acuto. Conspicilla remota. Antennas anticae mediocri- ler setigerse. Abdomen crassum, postice attenuatum, segmento ultimo subcylindrico. Styli caudales dimidio abdominis breviores, divaricati, setis paulo longioribus. Long. 2-V"- — Hah. in mari Atlantico, lat. bor. 3° 45' - 4° 20', long, occ. 19° 30' - 18° 30' ; etiam lat. aust. 6° 20', long. occ. 24°. 16. CoRYC^us VENUSTUS. — Cephalotliorax mediocris, segmento quarto breviter acuto. Conspicilla remotiuscula. Antennae anticae longe setigerae. Antennarum posticarum carpus digito fere duplo Ion- ' gior, apice interno dentiformi, seta longa, nuda, digito subaeque 2-arti- culato. Abdomen 2-articulatum, segmento primo paulo latiore et lon- giore. Styli caudales abdomine paulo breviores, divaricatae, setis ab- dominis longitudine. Long. xV"- — Hah. in mari Pacifico, prope insulas " Kingsmill." B. Seta carpi antennarum posticarum setulosa. [^Cephalothgrax pos- tice longe acutus.^ 17. CoRYC^us FELLUCiBus. — Ceplialolhorax gracilis, ventre max- OF ARTS AND SCIENCES. 39 ime carinato. Conspicilla fere contigua. Antennas anticae 7-articula- toe, setis fere brevibus. Antennarum posticarum carpus ad apicem in- ternum apiculatus, digito brevi. Abdomen 1-articulalum, apice oblique truncate. Styli caudales dimidio abdominis longiores, setis vix majo- ribus. Long. ^\". — Hai. in mari Atlantic©, lat. bor. 4° -7°, long. occ. 19° 30' -21° 30'; quoque lat. aust. 2° 20', long. occ. 20°. 18. CoRYC^us coNciNNTJS. — C. pellucido similis. Cephalothorax paulo crassior ; abdomen gracilius ; styli breviores, dimidium abdomi- nis longitudine non superantes. Antennae anticse 3-articulat8e. Long. 2-y. — Hah. in mari Pacifico, lat. aust. 15° 35', long. occ. 138° 30' ; quoque leucas 80 ab insula " Tongatabu " versus austrum. 19. CoRYc^us PRODucTus. — Antennae anticse 5 - 7-articulatae, bre- vissime setulosse. Antennarum posticarum carpus ad apicem acutus, et digitus brevis, 3-articulatus. Abdomen elongatum, ad apicem obli- que non truncatum. Styli caudales dimidio breviores, setis stylo paulo longioribus. Long. T^^". — Hab. in mari Atlantico, lat. bor. 8° 35', long. occ. 23° 40'. 20. CoRYC^us LONGICAUDATUS. — Ccphalothorax mediocris, seg- mento quarto longe acuto. Conspicilla fere contigua. Antennae anticae 7-articulat8e, setis longiusculis, antenna brevioribus. Antennarum pos- ticarum carpus ad apicem internum acutus, et digitus parvulus, 3-arti- culatus. Abdomen mediocre, subellipticum. Styli caudales longiores, setis dimidio brevioribus. Long. -J^", — Hab. in mari Atlantico, lat. bor. 5°-0° .50', long. occ. 18° - 20° ; quoque lat. aust. 2° 20', long. occ. 20°. Genus II. ANTARIA. Corpus crassum, antice rolundatum. Conspicilla fronte affixa. An- ienncn posticce parvae, ad apicem breviter setigerae, pedibus anticis (ct. vii.) non majores, carpo postice angulato. Pedes antici sexu vix dissimiles (.'■), digito tenui subuncinato. Abdomen pauci-articula- tum. [Cephalothorax postice obtusus.] I. Antaria crassibiana. — Pedes antici pervalidi, antennis posticis valde majores, articulo secundo abdomen longitudine fere cequante. Abdomen 3-articulatum, segmentis primo tertioque perbrevibus. Styli caudales abdomine triple et setae duple breviores. 40 PROCEEDINGS OF THE AMERICAN ACADE5IT Long. -jV'- — Hah. in mari Atlantico, lat. bor. 1°, long. aust. 18°. 2. Antaria gracilis. — Conspicilla remota. Pedes antici medio- cres, antennis posticis paululo majores. Abdomen sensim atlenuatum. Styli caudales abdomine quadruplo breviores, setis dimidio abdominis longioribus. Long. ^y. — Hob. in man Atlantico, lat. bor. 5° - 7°, long. occ. 21° -22° ; lat. aust. 2° 20', long. occ. 20°. 3. Antaria obtusa. — Conspicilla remota, parvula. Pedes antici parvuli, antennis posticis paululo majores. Abdomen sensim attenua- tum, apice obsolete 3-articulatum. Styli caudales dimidio abdominis paulo breviores, setis longiores. Cephalothorax postice rotundatus. Long. -^jj". — Hal. in mari " Sulu," prope insulam " Panay." Genus HI. COPILIA. Corpus depressum, fronte late quadratum, et conspicilla ad angulos anticos gerens. Antenncz posticcB digitiformes, digito elongato, subu- late. Abdomen pauci-articulatum appendicibus ad basin nuUis. 1. CopiLiA MiRABiLis, — Cephalothorax fronte latus, parce excava- tus postice paulo latior, segmentis posticis latere obtusis, postice ad api- cem dorsalem spinigero. Antennae posticae ad articulum primum setu- losae, digito longo. Abdomen tenue, cephalothoracis dimidio brevius, obsolete 5-articulatum. Styli abdomine longiores, tenuissimi. Long. yV'- — Hah. in mari Pacifico, prope insulas " Kingsmilk" 2. CopiLiA QTJADRATA. — Cephalothorax antice bene quadratus, fron- te parce excavatus, segmentis latere obtusis, postico brevissimo. Ab- domen 4-articulatum, tenue, segmentis secundo tertioque non longiori- bus quam primum, quarto dimidium abdominis longitudine superante et lateribus parce excavato. Styli abdomine longiores, tenuissimi. Hah. in mari Pacifico, lat. aust. 15° 20', long. occ. 148° ; quoque lat. bor., prope long, orient. 165°. Genus IV. SAPPHIRINA. Corpus depressum. Sexus antennas posticas stylosque caudales simi- les, et abdomen, pedesque antici {vel maxillipedes, ct. vii.) dissi- miles. AntemKz posticce. pediformes, digito tenui, 2-articulato, ad apicem unguiculato. Ahdomen femina 5 - 6-articulatum, thorace subito angustius, appendices breves ad basin latere gerens ; maris 4 -5-articulatum, thorace subito non angustius, appendicibus nullis. OF ARTS AND SCIENCES. 41 Pedes antici maris digitum elongati,/eOTmce breves. Styli caudales laminati. — Mares saepe Isete opalini aut fulgide metallini, interdum caerulei. Femince, soepius incoloratiB, plus mlnusve pellucidse ; inter- dum opacae et azulese. 1. Conspicilla conjuncta. 1. Sapphirina iris. — Antennae posticte abbreviatae, digito dimidii carpi longitudine. Lamellae caudales tenuiter falciformes, divaricati ; setis tribus, duabus apicalibus dimidio styli longioribus, altera externa. — Femincs: Corpus gracillimum valde elongatum (latitudine maxima plus quintuple longius). Conspicilla fronte insita. Abdomen 6-articu- latum, segmento primo sequentibus vix angustiore. Maris : Corpus lineari-ellipticum, antice rotundatum. Conspicilla inferiora, fronte re- motiuscula. Long. ^". — Hah. in mari Pacifico, lat. aust. 41°, long. occ. 76° 24'. 2. Sapphirina angusta. — Digitus antennarum posticarum carpo valde (non duplo) brevior. Lamellae caudales elongatse, subovatae, ad apicem internum prominulo, subacute ; setis quatuor, duabus apica- libus dimidio lamellte brevioribus, aliis duabus externis brevioribus. — FemincB: Corpus valde elongatum (latitudine maxima fere quadruple longius). Conspicilla fronte insita. Abdomen 6-articulatum, segmen- to primo angustiore, tertio, quarto, quintoque lunatis et latus acutis, pri- mo secundoque fere aequis. Long. ^". — Hab, in mari Pacifico, lat. aust. 43°, long. occ. 78° 45' ; etiam ad syrtas " LaguUas," lat. aust. 35° 50', long, orient. 23°. 3. Sapphirina elongata. — Digitus antennarum posticarum tenuis, dimidio brevior quam carpus. Lamellae caudales latse, breviter ovatae, apice interno vix prominulo, setis quatuor, totis dimidio lamellae brevio- res. — FemincB : Corpus anguste elongatum, valde convexum. Con- spicilla fronte insita. Abdomen 5-articulatum, segmento primo parvu- lo, secundo majore sed valde minore quam sequens, sublunato. Long. yV'. — Hab. in mari Pacifico, lat. bor. 15°, long, orient. 179°. 4. Sapphirina metallina. — Lamellae caudales fere rectanculatae, apice subtruncatae, setis quatuor apicalibus subaequis, parce breviori- bus quam lamellae. — Maris : Corpus valde depressum, angustato-el- lipticum, 9-articulatum, segmento ultimo tecto, primo oblongo, quarto dimidio breviore quam quintum. Lo7ig. -iV'- — Hab. in mari Pacifico, prope insulas " Kingsmill." 5. Sapphirina coruscans. — Digitus antennarum posticarum paulo VOL. II. 6 42 PROCEEDINGS OF THE AMERICAN ACADEMY brevior quam carpus, tenuis, unguiculo elongate. Lamellae caudales subovatse, ad apicem rotundatae, apice interne setam brevem gerentc, setis aliis quatuor, totis brevibus (lamella fere quadruple brevioribus). — Maris : Corpus depressum, elongato-ovatum, postice angustatum, segmento prime (fere duplice) parce oblongo, aliis segmentis fere si- milibus. Conspicilla fronte insita, prominentia. Long. -j^". — Hab. in mari Pacifico, lat. aust. 18° 10', long. occ. 125° 30'. 6. Sapphirina in^qualis. — Digitus antennarum posticarum carpo non brevior, tenuis, unguiculo brevi. Lamellae caudales oblongse, sub- ovatae, apice interne prominulo, subacute, setis quatuor, setis dimidio lamellae non longioribus. — FemincB : Corpus longe ovatum, segmen- tis cephalothoracis tribus ultimis dissimilibus, segmento ultimo breviore et latere acuto, penultimo obtuse. Conspicilla fronte insita. Abdo- men 6-articulatum, segmento primo fere obsolete aut tecto, secundo postice acuto. Long. yV'. — Hah. in mari Pacifico, lat. aust. 43°, long. occ. 78° 45'. 7. Sapphirina ovata. — Digitus antennarum posticarum ferme lon- gitudine carpi, articulis duabus digiti subaequis. Lamellae caudales gra- ciles, lanceolatae, parce divaricatae ; setis 4-5, una interna, una aut duabus apicalibus, et aliis duabus externis, totis dimidio lamellae valde brevioribus. — FemincB : Corpus valde depressum. Cephalothorax ovatus, segmento antico paulo oblongo, segmentis duobus ultimis la- tere rotundatis, ultimo angustiore. Conspicilla fronte insita. Abdo- men elongato-ellipticum, 5-articulatum, segmento primo non angusti- ore. — Rubescens. Long. Y2-". — Hah. in freto " Balabac," prope insulam " Borneo." 8. Sapphirina splendens. — Digitus antennarum posticarum tenuis, carpo vix brevior. Lamellce caudales ovato-rotundatae, apice interno acuto ; setis quatuor, duabus apicalibus dimidio lamellae non longioribus, aliis externis. — Maris : Corpus valde depressum, ovatum. Conspi- cilla fronte insita. Segmento primo (vix duplice) transverse, aliis lon- gitudine subaequis, latere obtusis. Long. tV'- — Hab. in mari Pacifico, prope insulam " Assumption," lat. bor. 19° 30', long, orient. 144° 30'. 9. Sapphirina ovalts. — Digitus antennarum posticarum crassus, carpo fere longior, articulis digiti valde inaequis, unguiculo dimidium digiti longitudine acquante. Lamellae caudales ovatae, setis quinque, una OF ARTS AND SCIENCES. 43 interna, duabus apicalibus, et aliis externis, totis paulo brevioribus quam lamellae. — FemincB : Corpus valde convexum. Cephalothorax el- lipticus, 5-articulatus, segmento antico non oblongo, postico parvo. Conspicilla fronte insita. Abdomen 5-articulatum, segmento primo mi- nore, latere truncate, tertio quartoque lunatis. — Opaca, azalea. Hab. in mari Pacifico, prope insulam " Tongatabu," versus Aus- trum. 10. Sapphirina detonsa. — Digitus antennarum posticarum tenuis, carpo paulo brevior, unguiculo dimidii digiti longitudine. Lamella? caudales approximatee, subovatae, latitudine plus duplo longiores, setis brevissimis (obsolescentibus). — Femincs : Corpus valde convexum. Cephalothorax ellipticus, 5-articulatus, segmento primo non oblongo, aliis latera obtusis. Conspicilla fronte insita. Abdomen 5-articula- tum, segmento primo fere obsoleto aut tecto, secundo latere obtuso, ter- tio quartoque lunatis. — Translucens, brunnescens. Long. yV'. — Hab. in mari Pacifico, lat. aust. 15°, long. occ. 138° 45'. 11. Sapphirina indigotica. — Digitus antennarum posticarum te- nuis, fere carpi longitudine, et unguiculo fere dimidii digiti. Lamellae caudales subovatae, apice interne vix prominulo, setis quatuor, duabus apicalibus, aliis externis, totis dimidio lamellae vix brevioribus. — Feini- nee : Corpus valde convexum. Cephalothorax ellipticus. Conspicilla fronte insita. Abdomen 6-articulatum, segmento primo parvulo, tertio, quarto, quintoque lunatis, — Opaca, et azulea. Long. yV'. — Hab. in mari Pacifico, lat. bor. 28°, long, orient. 177°. 12. Sapphirina orientalis. — Digitus antennarum posticarum te- nuis, ferme carpi longitudine, unguiculo minus dimidio digiti. Lamel- lae caudales breviter ovatae, prope apicem internum dente acuto arma- tae, setis quatuor, duabus apicalibus, aliis externis, totis brevibus, vix dimidii lamellae longitudine. — Maris : Corpus valde depressum, sub- ovatum, 10-articulatum, segmento antico latiore et paulo transverso, aliis sensim angustioribus. Conspicilla fronte insita. — Femince {?) : Corpus convexum. Cephalothorax ellipticus, 5-articulatus, segmento antico non transverso, postico ad latus truncate, angulis posticis acutis. Conspicilla fronte insita. Abdomen 6-articulatum, segmento primo mi- nore, lateribus truncatis, secundo lateribus rotundatis, tribus sequentibus lunatis. — Maris color, opalinus ; femincB indigoticus, opacus. Long. j\j". — Hab. in mari " Sulu." 44 PROCEEDINGS OF THE AMERICAN ACADEMY 2. Conspicilla non contigua. 13. Sapphirina ovato-lanceolata. — Digitus antennarum postica- rum dimidio carpi paulo longior, articulis duabus digiti valde inaequis. Lamellae caudales latitudine duplo longiores, non divaricatse, setis quin- que, totis brevibus, una brevissima ad apicem internum insita. — Ma- ris : Corpus ovato-lanceolatum, 10-articulatum, segmento antico vix ob- longo, tribus penultimis lunatis et latera subacutis aut obtusis. Con- spicilla subremota, inferiora, et fronte remota. Splendide opalina. Long. j". — FemincB : Corpus ovato-lanceolatum, abdomine (articulo primo brevissimo excluso) vix angustiore. Cephalothorax 4-articulatus, segmento antico fere duplice, aliis inter sese similibus, latere obtusis. Conspicilla remotiuscula, fronte insita. Abdominis segmenta secun- dum tertium quartumque late sublunata ea latere subacuta. — Vix dia- phana. — Long. ^V'- Hab. in mari Atlantico, prope " E.io de Janeiro " ; quoque lat. aust. 23°, long. occ. 41°. 14. Sapphirina gebima, — Digitus antennarum posticarum carpo parce brevior, tenuis, articulis duabus digiti valde insequis, unguiculo brevi. Lamellae caudales subellipticae, latitudine duplo longiores, ad- apicem internum minute apiculato, setis quatuor, brevibus, duabus api- calibus, aliis externis. — Femince : Corpus gracillimum, elongatum. Cephalothorax 5-articulatus articulatione prima fere obsoleta, segmen- to antico parce oblongo, posticis inter sese similibus, sensim minoribus. Abdomen valde angustius, 6-articulatum, segmentis primo secundoque subaequis, sequentibus vix lunatis. Conspicilla remotiuscula, inferiora, prope frontem insita. — Maris : Corpus oblongo-subellipticum 10-ar- ticulatum, segmento antico paulo transverso, posticis ad latis non acu- tis. Conspicilla remotiuscula, inferiora et fronte remota. — Color ma- ris opalinus et flammeus ; feminm null us, sacculorum pallide cyaneus. Long. 'I". — Hah. in mari Australis, ad syrtas " LaguUas." — An SapphirincB indicatori pertinet .'' 15. Sapphirina bella. — Digitus antennarum posticarum tenuis, ferme carpi longitudine, articulis digiti fere aequis, unguiculo parvulo. Lamellae caudales divaricatae, angustae, lanceolatae, setis quatuor, dua- bus apicalibus, aliis externis, totis perbrevibus. — Maris : Corpus ova- tum, 9-articulatum, segmento ultimo tecto, antico parce oblongo, ad la- tus totis obtusis. Conspicilla parvula, remotiuscula, inferiora, prope frontem insita. — Splendide versicolor. Long. ■^~'. — Hah. in mari Pacifico, prope insulas " Kingsmill." OF ARTS AND SCIENCES. 45 16. Sapphirina opalina. — Digitus antennarum posticarum tenuis, carpo fere longior, unguiculo brevi. Lamellae caudales suborbiculatae, apice interno producto, acuto, setis dimidio lamellse vix longioribus. — Maris : Corpus ovatum, 10-articulatum, articulatione prima fere obso- leta, segmento postico tecto, quatuor penultimis latere ad angulos pos- ticos acutis, Conspicilla remotiuscula, fronte insita. — Splendide opa- lina. Long. ^". — Hah. in mari Atlantico, lat. bor. 1° - 0°, long. occ. 17° - 18° ; quoque lat. aust. 4° 30', long. occ. 25°. 17. Sapphirina versicolor. — Digitus antennarum posticarum te- nuis, carpo vix longior, unguiculo longiusculo (dimidium digiti longitudi- ne fere sequante). Lamellae caudales latae, latitudine breviores, apice interno producto et acuto, setis quatuor, brevissimis. — Maris :■ Corpus ovatum, 10-articulatum, segmento antico transverso, semicirculari, aliis longitudine subsequis, quatuor penultimis ad latera minute acutis. Con- spicilla remotiuscula, fronte insita. — Opalina. — S. opalince affinis. Long. -ySj". — Hab. in mari Atlantico, prope " Rio de Janeiro," lat. aust. 24°, long. occ. 43°. 18. Sapphirina tenella. — Digitus antennarum posticarum tenuis, carpo longior, unguiculo parvulo. Lamellae caudales latitudine duplo longiores, setis dimidio lamellae valde breviores, una ad apicem inter- num fere obsoleta. — Femina, : Cephalothorax ovatus, 5-articulatus, articulatione prima fere obsoleta, segmento antico non transverso, pos- ticis inter sese similibus, angulo postico subacuto. Abdomen angus- tum, 6-articulatum, segmento primo brevissimo, secundo latere obtuso, tribus sequentibus lunatis. Conspicilla remotiuscula, fronte insita. — Maris : Corpus longe ovatum, 10-articulatum, postice segmentis sen- sim minoribus, segmento antico semicirculari, lateribus obtusis. Con- spicilla remotiuscula, fronte insita. — Maris corpus diaphanum, pul- chre versicolor ; femincs. subdiaphanum, non coloratum. Long. tV-tV- — Hah. in mari Atlantico, lat. aust. 20° -23°, long. occ. 38° 45' -41° ; quoque lat. aust. 4^°, long. occ. 25° ; quoque lat. aust. 24°, long. occ. 43°. — An S.fulgenti (M. Edwardsii) pertinet ? 19. Sapphirina obesa. — Lamellse caudales latae, subellipticaj lati- tudine non duplo longiores, setis brevissimis, fere obsoletis, una ad api- cem internum vix dispicienda. — Feminm : Cephalothorax late subova- tus, convexus 5-articulatus, segmento antico transverso, ultimis duobus duplo brevioribus quam tertio, quarto ad angulos rotundato, quinto ad angulos subacuto. Abdomen 5-articulatum, segmento primo brevissi- 46 PROCEEDINGS OF THE AMERICAN ACADEMY mo, tribus sequentibus lunatis. Conspicilla remotiuscula, fronte insita. — Brunnescens. Long. yV'. — Hah. in mari Pacifico, prope insulas " Kingsmill." 20. Sapphirina obtusa. — Lamellae caudales elongatae, non divari- catae, setis dimidio lamellae valde brevioribus. — FemincB : Cephalotho- rax convexus, 4-articuIatus, ad frontem subtruncatus, segmento antico oblongo, lateribus fere parallelis, angulis posticis rotundalis, segmentis aliis dissimilibus, secundo ad latus truncate, tertio rotundato, quarto (vel ultimo) medium ad latus angulato. Abdomen angustum, 5-articulatum, segmento primo parvulo, tribus sequentibus sublunatis. — Rubescens. Long. J^". — Hah. in mari Pacifico, lat. aust. 43°, long. occ. 78° 45'. Familia V. MI R AC ID .E. Oculi duo conspicillis maximis constructi. AntenncB posticce ad api- cem setigerse. Pedes mandibulares maxillaresque brevissimi. Ah- domen feminse (an maris quoque ?) 6-articulatum. Sacculus ovige- rus unicus. Genus MIRACIA, Corpus elongatum, non depressum, ad frontem duas appendices falci- formes subtus gerens. Antennce anticce appendiculatfe, flexiles at non geniculantes. Pedes antici (ct. vii.) mediocres, uni-unguicula- ti ; pedes duo sequentes biremes, lateraliter porrecti. Pedes abdom- inis longe setigeri. Seics caudales elongatse. — Setella, affinis, sed conspicilla oculorum diversse. 1. MiRACiA EFFERATA. — Corpus 10-articu!atum, segmento antico valde latiore, aliis sensim attenuatis. Conspicilla fronte insita, maxima, valde prominentia, contigua. Antennae anticae mediocres, 7-articulataB, articulis tertio quinto septimoque brevibus. Styli caudales oblongi, se- tis duplo longioribus. — Cyanea. Long. ^y. — Hah. in mari Atlantico, lat. bor. 4° - 7°, long. occ. 20° - 21° 30' ; quoque lat. aust. 4° 30', long. occ. 25°. 2. MiRACiA GRACILIS. — Corpus gracile, scnsim postice attenuatum, 10-articulatum, segmento antico non latiore. Conspicilla maxima, paulo prominentia, fronte insita. Antennae anticae tenuissimae, articu- lis secundo, quarto, duobusque ultimis brevibus. Styli caudales oblon- gi, setis quadruple longioribus, fere corporis longitudine. — Cyanea et viridis. Long. tlV"- — Hah. in mari Pacifico, lat. aust. 32° 24', long, orient. 177° ; quoque prope insulam " Sunday." OF ARTS AND SCIENCES. 47 Tribus 2. DAPHNIACEA (vel Cladocera). Corpus testa plerumque tectum, capite antennisque posticis sospius exclusis. Pedes plures natatorii. AntenncB anticce. ssepe obsolete, raro elongatse. Oculus compositus. [Membra tota cephalothoracis mandibularia, maxillaria, pediformiaque 12 - 16.] Tribus hujus familise sunt : — 1. Penilid^. — Pedes duodecim. AntennfB anticce obsolescentes. 2. Daphnid^. — Pedes decern. Antennae anticae sive obsoletse sive uni-articulatae. 3. BosMiNiD^. — Pedes decem. Antennae anticae elongatse, multi- articulatse. 4. PolyphemidjE. — Pedes octo. Antennae anticae obsolescentes. Familial. PENILIDiE. Genus PENILIA. (D.) Caput discretum, longe rostratum. Antennce. posticce grandes, ramis duobus 2-articulatis. Abdomen non inflexum, stylis duobus corneis confectum. 1. Penilia avirostris. — Testa dorso valde tumida, postice late bi- cuspidata et ad medium profonde excavata, marginibus infero postico- que per denticulos eleganter armata. Setae appendicium abdominis dorsalium stylis caudalibus breviores. Long. 2^\y"- — Hab. in porto " Rio Janeiro." — Lect. die 24 Dec, 1838. 2. Penilia orientalis. — Testa dorso tumida, postice late bicuspi- data, ad medium paulo excavata, marginibus infero posticoque per den- ticulos eleganter armata. Setae appendicium abdominis dorsalium sty- lis caudalibus fere duplo longiores. Long. -J^". — Hab. prope fretum " Sunda." — Lect. die 5 Mar., 1842. Familia II. DAPHNID^. Genus I. DAPHNIA. Abdomen inflexum. Antennce anticce obsolescentes. Antennce posticce birameae, ramis 3 - 4-articulatis. Intestina non convoluta. 1. Daphnia textilis. — Valde tumida, subglobosa, paulo oblonga, 48 PROCEEDINGS OF THE AMERICAN ACADEMY post medium paulo latior, postice breviter subtriangulata, obtusa. Ca- put breve, brevissime acuteque rostratum, superne visum breviter sub- triangulatum, obtusum. Rami antennarum valde ina;qui, tri-articulati. Testa reticulata areolis bene hexagonis. Hub. in stagnis prope portum " Sandal wood " ad insulam " Vanua" Lebu " in archipelago " Viti." 2. Daphnia australiensis. — Valde tumida, paulo oblonga, capite per constrictionem vix discreto ; post medium altior, postice subtrian- gulata, obtusa, dorso postico subtilissime denticulate. Caput breve, superne visum triangulatum, obtusum. Rami antennarum posticarum suba3qui, setis longiusculis. Testa reticulata, areolis longe angustissi- meque linearibus, obliquis, prope marginem valde latioribus. Hah. in stagnis prope urbem " Sydney" Novi-HoUandise. 3. Daphnia macrura. — Gracilis, elongata, testa postice aculeato- producta, aculeo tenui, paulo breviore quam corpus. Caput grande, corpore non humilius, supra non discretum infra nee rostratum ; fronte latere visa rotundata, superne visa bene acuta. Corpus ad margines dorsales infero-posticosque et aculeus subtilissime denticulati. Hah. in stagnis prope urbem " Sydney " Novi-Hollandiae. Genus II. SIDA. Abdomen rectum. Aiitennce. anticce fere obsoletae. AntenncB posticce birameae, ramo uno 2-articulato. Intestina non convoluta. SiDA angusta. — Angusto-oblonga, postice parce altior et rotundato- truncata, capite valde discreto, fere oblongo, paulo humiliore quam cor- pus, fronte obtusa. Abdomen testa fere omnino tectum. Antennae anticse fere corporis longitudine, ramis basi brevioribus, 2 et 3-artlcula- tis, uno ramo setis paucis ciliato. Hah. in stagnis ad insulam " Vanua Lebu." Genus III. LYNCEUS. Abdomen inflexum. Intestina convoluta. Antennce anticce fere obso- letae. Antenna posticce parvae. Lynceus latifrons. — Valde tumidus ; latere visus rotundatus, papite indiscreto, brevissimo, rostrato, rostro gracili, acuto, ad corpus stricte appresso ; superne visus, fronte latissime truncata parce angus- tiore quam corpus, latere postico breviter triangulate et obtuso. Hah. in stagnis ad insulam " Vanua Lebu." OF ARTS AND SCIENCES. 49 Familla IV. P OL YPH E MIDiE. Pedes octo. Oculus maximus. Genus POLYPHEMUS. Caput discretum, magnum. Antennce biramese, validae. Polyphemus brevicaudis. — Testa postice tumida rotundata. Ca- put oblongum (paulo brevius quam testa reliqua), conoideum, antice latius et globulare. Rami antennarum suba^qui 3-articulati, parce seti- geri. Pedes crassi. Abdomen non inflexum, breve, crassum, parce exsertum, furcatum, ad apicem acutum. Long. -jV'- — Hai. in mari Atlantico, lat. aust. 41°, long. occ. 62°. — Lect. die 25 Jan., 1839. Tribus 3. CYPRIDACEA (vel Ostracoda). Corpus testa bivalvi omnino tectum, postice incurvatum, capite anten- nisque nunquam exclusis. Perfesnulli biremes nee natatorii. Oculi vel simplices vel compositi. Antenn(B quatuor. [Membra cepha- lothoracis mandibularia, maxillaria, pediformiaque numero decem.] Genus I. CYPRIS. (Midler.) Testa integra, ad frontem nee perforata nee incisa. Oculus unicus. AnienncE anticce. setigerse, subnatatoriee. AntenncR posticcB subpedi- formes, setigerse. Pedes mandihulares 3 - 5-articulati. MaxiUcB quatuor, breves. Pedes quatuor, duo uncinis longi confecti, duo sequentes graciles, 4 - 5-articulati, ad ova pertinentes. 1. Cypris speciosa. — Oblonga, subovata, antice angustior, subtus fere recta, vix excavata, alioque bene arcuata, altitudine latior et plus duplo longior ; ad marginem anticum pubescens, posticum breviter ciliata. Flava et Isete viridis, areis flavis paucis imperfectis viridi cir- cumdatis. Hab. in stagnis prope urbem "Rio de Janeiro." — Lect. Dec, 1838. 2. Cypris albiba. — Latere visa, breviter subelliptica, extremitates fere sequa, late rotundata, subtus recta, supra obsolete gibbosa ; triplo longior quam latitudo, non duplo longior quam altitudo, margine pu- bescente. Oculus margine superno remotus. Albido-margaritacea, postice et superne paulo brunnea. Long. ^V"- — Hab. in stagnis prope " Valparaiso." VOL. II. 7 50 PROCEEDINGS OF THE AMERICAN ACADEMY 3. CiTRis Chilensis, — Latere visa, subovata, post medium parce altior, subtus paululo arcuata, dorsum vix gibbosa, triplo longior quam latitudo, diiplo longior quam altitude, marginibus antico infero poslico- que pubescentibus. Antennae anticae 7-articulatae, setis dimidio cor- poris vix longioribus. Long. -^^". — Hah. in stagnis prope " Valparaiso." 4. Cypris pubescens. — Brevis ; latere visa, latissime fabiformis, subtus recta, extremitatibus late et seque rotundatis, dorso bene arcuato ; siiperne visa, late ovata, fronte subacuta ; ad totam superficiem pubes- cens. Antennae anticae 7-articulatae, setis vix longioribus quam 5 articuU ultimi simul sumti. Antennae posticae crassiusculae, articulo ultimo fere dimidii penultimi longitudine, setam longam ad apicem gerente, penultimo ad apicem longe setigero. — Pallide olivacea. Hab. in stagnis prope urbem " Sydney " Novi-Hollandiae. 5. Cypris Vitiensis. — Longe subfabiformis ; latere visa, altitudine plus duplo longior, subtus recta, dorsum arcuata, ante medium paulo altior, extremitate antica latius rotundata ; superne visa, subelliptica, ante medium vix latior, antice subacuta, postice rotundata, latitudine duplo longior ; ad totam superficiem pubescens. Antennae anticae 7- articulatae, articulis quinque ultimis inter sese longitudine fere aequis, setis antenna brevioribus. Long. -^jj". — Hah. in stagnis prope portum " Nailoa," ad insulam " Vanua Lebu," in archipelago " Viti." Genus II. CYPRIDINA. [Milne Edwards.) Testa breviter rostrata corpus omnino tegens, et clausa. Oculi duo compositi, remoti. AntenncB antica setis paucis inaequis ad apicem instructae, setis rectis, saepe divaricantibus, vix natatoriis. Antennce posticcE 5-7 articulis brevissimis longe et plumose setigeris confec- tae. Pedes mandibulares 5-articulati, digitiformes, apicem unguicu- lati. Maxillce, sex, breves, breviter setigerae, paris secundi laminam ciliatam ad basin gerentes, setis longis, plumosis. Pedes duo, lon- gissime vermiformes, omnino flexiles, ad ova pertinentes, ad apicem setis spinulosis partim reversis armati. Aldomen spinulis biseriatis confectum. 1. CYPpiDiNA LUTEOLA. — Compresso-ovoidea ; latere visa, late ellip- tica, antice breviter rostrata, fronte non prominula, marginibus aliis ar- cuatis, postice non gibboso ; superne visa, angusto-ovata, antice acuta. OF ARTS AND SCIENCES. 51 postice rotundata. Digitus pedis mandibularis ad basin crassus, sensirn attenuatus. Antennae anticse ad apicem 4- 5-setigerae, setis antenna non longioribus. — Luteola. Long. yV'. — Hub. in mari " Sulu." 2. Cypridina PUNCTATA. — Compresso-ovoidea, punctata ; latere vi- sa, late ovalis, postice gibbosa, infra supraque asque arcuata, antice bre- viter rostrata, fronte prominula, rostro gracili, acuminato ; superne visa, angusto-elliptica, extra mitatibus rotundatis. Spinulse caudales decern. Hab. in mari " Sulu." 3. Cypridina olivacea. — Subovoidea ; latere visa, oblongo-subel- liptica, dorsum parce arcuata, postice truncata et sparsim ciliata, antice rostrata, rostro ad apicem rectangulato, fronte prominente ; superne vi- sa, longe ovata, antice obtusa, postice subtruncata. Antennae antic formam similis, dorsam fere recta, postice rotundata, fronte prominula, et truncata. Antennae anticae setis inaequis, seta longiore curvata prope apicem incrassata, nuda. Spiculum capite cylindrico. Antennae posticae 7-articulatae, articulo secundo non duplo longiore quam sequentes simul sumti. — Albida. Testa lineis parallelis subtilissimfe notata. Long. yV'- — -f-^^^- '" ™^^i Atlantico, lat. aust. 23°, long. occ. 41° 10'. — Lect. die 19 Nov., 1838. 4. CoNCH^ciA iNFLATA. — Supevue visu, brevissime ovata, frontem rotundata, postice subacuta ; latere visa subrotundata, dorsum fere rec- ta, literae ^^ formam similis, angulis rotundatis, fronte obsolete promi- nula. Spiculum cylindricum. Antennae anticae 3-articulatPe, setis lon- gis, una subclavata, nuda. Antennae posticae 7-articulatae, articulo se- cundo plus duplo longiore quam 5 ultimi simul sumti. Pedes mandi- bulares 5-«articulati, articulo secundo brevi, non longiore quam tertius, basi longe et crasse producto, primo ad apicem pariter producto, his processubus duobus corneis denticulatis instar mandibulae. OF ARTS AND SCIENCES. 53 Long. jV'. — Hub. in mari Atlantico, lat. aust. 1°, long. occ. 18° ; et lat. aust. 11°, long. occ. 12°. — Lect. die 5 Nov., 1838, et die 6 Mali, 1842. SuBORDO 2. CORMOSTOMATA. Os rostriformis. — Tribus quatuor sequentes : — I. MoNSTRiLLACEA. — Corpus elongatum (Cyclopi simile). Maxillae pedesque antici obsoleti. Pedes postici octo natatorii. II. Caligacea. — Corpus seepius depressum. Maxillse pedesque toti numero 12 - 14, octo pedes ultimi plerumque natatorii, plurimi testa tecti. III. Lern^acea. — Corpus depressum aut vermiforme. Antennae pe- desque partim obsoleti. IV. Nymphacea. — Corpus breve, araneiforme, abdomine obsolescente. Tribus I. MONSTRILLACEA. Genus MONSTRILLA. (Dana.) Cephalothorax fere cylindricus, 4-articulatus. Abdomen 5- 6-articula- tum. Antennce dusR. Ocw/i duo simplices ; quoque oculus inferior sicut Poniellis. Trimcus buccalis parvulus subconicus, maxillis pe- dibusve non munitus. Pedes octo, natatorii. MoNSTRiLLA viRiDis. — Gracilis, postice attenuata. Oculi remoti. Antennae 5-articulat8e, setis antenna brevioribus. Abdomen 5-articula- tum, segmento secundo breviore quam primus vel secundus. Styli caudales oblongi, parvi, divaricati, setis 5 subaequis, diffusis. — Lsete graminea. Long. I". — Hob. in mari " Sulu." — Lect. die 3 Feb., 1842. Tribus 2. CALIGACEA. Familiae quinque sequentes : — 1. ArgulidjE. — Corpus antice late peltatum. Ovarium externum nullum. Pedes antici large tubulati, suctatorii. 2. Caligid^. — Corpus antice late peltatum. Ovarium externum tubiforme, rectum, ovis uniseriatis. Pedes quatuor antici subprehensi- les. Antennae posticae carapace tectse. 54 PROCEEDINGS OF THE AMERICAN ACADEMY 3. DiCHELESTiD^. — Corpus depressum, valcle angustum. Anten- na3 posticae carapace non tectae. Ovarium externum tubiforme, ovis uniseriatis. 4. Ergasilid^. — Coryc(2is affines. Corpus vix depressum, plus minusve Cyclopiforme. Antennee posticae carapace non tectae. Ova- rium externum elongatum aut sacculiforme, ovis non uniseriatis. 5. NicoTHoiD^. — Corpus plerumque Cyclopiforme, sed e lateribus longissime alatum. Ovarium externum sacculiforme, ovis non unise- riatis. Familia II. CALIGID^. Subfamiliae Caligidarum nobis sunt : — 1. Caligin^. — Truncus buccalis subovatus, obtusus. Maxillcz trunco remotiusculas, postice aculeo-elongatae. Tubum ovigerum ex- ternum rectum. Corpus antice latius. (Genera sunt Caligus, Lepe- ophtheirus, Chdiimus, Caligeria, Calistes.) 2. Pandarin^e. — Truncus buccalis tenuis acuminatus. Maxillae ad truncum appressse, parvulae, lamellatae. Tubum ovigerum externum rectum. Corpus postice interdum latius. (Genera sunt Pandarus, Trehius, Nogagus, Specilligus, Dinematura, Phyllophora, Euryphora, Lepidopus.) 3. Cecropin^. — Truncus buccalis tenuis, acuminatus. Maxillae ad truncum appressae. Tubum ovigerum externum sub testam convolu- tum. Corpus postice latius. (Genera sunt Cecrops, LcBtnargus.) Caligaceorum segmenta corporis auctoribus saepe male data. Seg- mentum abdominis anticum, ovarium externum gestans, thoracis posti- cum saepe vocatum.* In Cyclopaceis Caligaceisque ovarium externum ad segmentum secundum abdominis normalem semper pertinet. Si haec animalia Cyclopaceis Crustaceisque aliis comparentur, affinitates veras educemus. Tabula sequens, membris ordine enumeratis, haec comparationem exhibet. * Vide Hist. J\fat. des Crustaces, par M. Milne Edwards, III, 445 et seq. OF ARTS AND SCIENCES. 55 w « m 05 3 o (-»■ H K S r^ (-^ B ?>-• a. a- B CD 5 §gS> p p ►1 P P p 3 cr p X y. s 'X cr o = = £r3 CD cr '^"^ 7^ < o TO • E.ffl p P Ctl P CO o' 3 ID o !» m CD fD 05 ►Q 3 B CD En n o p p. (D O O 01 3 Oq p+ CD 2 p c o 3 B_ O cr o o I S § ~« fa. ■ -i S" p (D — s p en CD 3 en 3 "• r: rf 2 CD -< S- ? r" o p 2. Mdominis. I. II. III. IV. V. VI. VII. Tegmenta.* 1. Cepkalothoracis. II". III. IV. V. VI. VII. VIII. IX. X. XI. XII. XIII. XIV. p. rud. P. rud. P. rud. P rud. P. rud. App. caud. 0 yyyyy^ms^K^>>o ^ < ^ ■< 2-x y. >< >f y. s r r z^ ?5J??-p.p.p.- • o.„„- qq oq CJq OTQ ;— ' ' " " S • 1-3 !> a G > 13 ►n ns ^-Td '-3 nX ^ "^ "-I ^ •-« _~ B B B B B O^ 0.0.0.0-0- P B O. Oculi Ant. I. Ant. II. Mand. Max. Max. Maxd. Maxd. P. subnat. P. subnat. P. subnat. P. subnat. 0 0 r o M 0 vel P. rud. 0 0 0 0 App. caud. 00 '=^yyyyy^'S^>> 5-,-,_w_PPP~3 CD3333^mw3«-»<-» §§i.s.sss|.p-^s-„„o o o o ■0 m 0 vel 00 . 0 , 0 0 0 App. caud 00 13 13 13 13 13 TJ § g g > > ooccpppp-igrg- • o oo3rr."'r-cD,~ .^h-mo o B > o p o- 13 13 13 -0 13 13 g g > > 333 3~:• t> 13 §„ ooool p B o. 13 13 Id 13 13 13 g 2 > > 333 3 3 3^1 = 5 oooppppppr5- • o ooor'r*r'r*."'r* P'i—ii_io H- 1 • 13 B 2 0 vel P. rud. 0 0 0 0 App. caud. 00 1-0 1-0 i-O 13 13 g 2 t> 3 3333^55 OOOOSSS.SS.- o-„oo oooor'rrr-r • ir^oo >■ >a > > o T) ^00 10.000 10.000 2.000 1.500 20.000 7.000 83 10.000 O.IOO 7.000 0.200 0.100 0.100 4.000 i 7.000 37 20.000 \ O.SOO 10.000 2.000 10.000 1.000 8.000 5.000 8R 12.000 0.800 0.800 — 0.400 m 2.000 ^^_ 0.800 0.300 0.400 40 1.250 0.400 0.600 0.800 41 1 .500 0.250 0.800 43 2.000 — 1.200 0.500 0.800 — "As some stopcocks may be of copper, a suite of experiments was made to ascertain the effect of this union. " Table XI. — Experiments with Lead and Copper. — A bar of lead and copper nail three fourths of an inch long. Lead solder. Days. Distilled Water. Cochituate. Croton. Fairmount. 1 5.000 0500 0.500 0.100 3 1.500 8.000 0.150 0.500 7 20.000 2.500 1.000 1.000 14 25.000 7.000 1.000 1.000 39 10.000 1.000 1.000 1.000 40 1.500 1.000 1.000 0.250 44 1.200 0.500 0.500 1.500 45 2.000 0.200 0.300 2000 46 5.000 0.800 0.800 3.000 47 3.000 0.050 0.020 1.500 49 2.300 0.010 0.800 2000 " Table XII. — Experiments icith Lead and Tin. — A half-bar of each soldered without alloy. Volume of water as before mentioned. Days. 1 Distilled Water. Albany. Cambridge. Cochituate. Croton. Fairmount. Jamaica. Troy. 40.000 0 500 0500 0.500 0.500 0.500 0.500 0.500 8 60.000 0.100 0.100 0.100 0.200 0.500 0.800 0.500 32 50.000 1.500 4.000 0.500 0.100 1.500 2.000 — 36 12000 0.050 0.050 1.500 38 1.500 — 0..500 1 .500 3.000 39 2.000 0.500 0.300 0.400 40 0.500 0.500 0.500 0.700 — 41 2.000 0.010 0.010 0.010 43 3.000 — 0.010 0.020 0.700 ' OF ARTS AND SCIENCES. 73 " Variation in some of the properties of the Cochituate water might be expected to take place. First, in the percentage of organic matter. Second, in temperature. Third, in percentage of salts. " The effect of increasing the percentage of organic matter is ex- hibited in the following table. " Table XIII. — Experiments ivith Lead in graduated Solutions of Organic Matter ( Tannin) in Cochituate Water. Cochituate and Cochituate and Cochituate and Cochituate and Days. Cochituate. 1 1 1 0 otr TTJ(I73-(T 1 100 0 00 Di.stilled Water. of Tannin. of Tannin. of Tannin. of Tannin. 3 1.000 0.800 0.400 0.600 o.noo 5.000 5 0.000 20.000* 0.500 0.250 0.2.50 20.000 6 0.500 2.000 0..500 0.100 0.100 4.000 7 0.000 2.000 0.200 0.000 0.000 3.000 8 0.050 0.500 0.100 0.000 0.000 2.500 10 0.000 0.500 0.000 0.000 0.100 3.000 11 0.000 0.000 0.000 0.000 0,000 2.000 12 0.100 0.(!00 0.000 0.000 0.000 3.000 13 0.0.50 0.000 0.000 0.000 0.000 2000 " The bars of the third and fourth columns became more or less coated with a loose reddish-brown coat of organic matter and lead. The influence of increased organic matter of this form (which is as nearly allied to the vegetable matters that might be expected to occur in lake water as could be readily found) was to lessen the action on lead. The organic matters of lake and river waters consist of living and deceased organisms, animal and vegetable, and of soluble substan- ces derived from decaying vegetation. When exposed a sufficient length of time, these matters become thoroughly inorganic. The car- bon becomes carbonic acid, and the hydrogen becomes water, by the consumption of oxygen in solution in the water. " My experiments have shown, that, if the quantity of organic mat- ter, such as the extract of bark, be more than xtt^tttt of the weight of the water, precipitates of the organic matter in combination with oxide of lead, if any is in solution, will take place. This is one of the meth- ods frequently resorted to for separating organic bodies from solutions.f * A kind of fungous or flocculent mass fell with the lead, augmenting the vol- ume of the precipitate. t This precipitate is visible in Croton service-pipes five years in use. It occurs in the Jamaica service-pipes in Boston, and, I have been informed, in those of Fairmount water in Philadelphia. VOT-. 11. 10 74 PROCEEDINGS OF THE AMERICAN ACADEMY The " The effect of temperature was sought in a variety of ways.* following experiments are recorded. " Table XIV. — Experiments with Bars previously coated, ex- posed to direct Sunlight from the 21s/ to the 26th of June. — Bars resting on the bottom of the tubes. Days. Cochituale. Croton. Jamaica. Distilled Water. 1 2 3 4 0.100 0.250 0.100 0.050 0.200 1.500 0.400 1.000 3.000 2.000 2.000 1.500 3.000 2.000 1.000 2.000 "The influence of extreme temperature and exposure to air and moisture, under the most favorable circumstances, was ascertained by transmitting steam mixed with air through a leaden pipe thirty-six feet long, coiled like a still-worm, and placed in cold water to produce con- densation. One hundred and ten cubic centimetres of the condensed water, after acidulation with acetic acid, were treated with a stream of hydrosulphuric acid. The precipitate was collected on a filter, pre- viously dried at 100° C, and gave 0.0225gr. of sulphide of lead, equal to 0.0196gr. of lead ; which is equivalent to 0.8095gr. of lead in a gal- lon. Whatever influence might result from such changes, it must be remembered that pipes under ground will preserve a tolerably even temperature ; and be the effect of increased heat what it may, it has been more energetic in Philadelphia than it ever can be in Boston. " The effect of increasing the percentage of common salt is exhibit- ed in the following table. " Table XV. — Experiments with Cochituate Water and graduat- ed Solutions of Common Salt. — Bars and volumes as in the foregoing experiments. No concentration. Bars resting on the bottom of the tubes. Cochituate and Cochituate and Cochituate and Cocliituate and Days. Pure Cochituate. Torn of Chloride of Sodium. Tn, M. Eq. 1848.0. I. II. III. M 0 157 6 53.25 156° 15 45"9 158° 8' 4^85 9. 68 28 32.6 68 28 3.3 68 27 56.1 II 70 56 50.8 71 35 14.75 71 41 2.2 i 5 35 32.88 5 35 33.4 5 35 34.4