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PSOE NETTIE cover med, LAL agent ev TH Hey FO ve | abe idutandeatlnw Ah Thr) 7 45 i} 5 arty . 1 ' i es) yaa T no a Cae ; tes. ee a , ae ue a rtd Ray het rH ae oe ep o A 7 ty 5 i‘ ieee Pa - oe La i ie mn) a BAS ae ot ae i ae aero a i I a + ; pil fr a ey | | : aE iv , ae. mt Seon No 7 - : i‘ P oy an, ee a a oe = he Pa aoe a 7 a 7 a an ra Y ae af an oy) a) Se a ma nae ii a ae = ae) a ic " aa fia AS any) aa a fe ny im pad Lan Bn we 0 ‘ i et ay . =? i Be ats, My) = i ‘ A oe re ¢ ne ih we 3 WHS ie ptt j bes * f > . | Att F « vi : } ia re 4 | Nate } \. by 1 bat j Me ae j The Polychztous Annelids Dredged by the U.S.S. “Albatross” off the Coast of South- ern California in 1904. I. Syllidz, Sphzrodoridz, Hesionidz and Phyllodocidz. BY J. PERCY MOORE. From the Proceedings of The Academy of Natural Sciences of Philadelphia, June, 1909. Issued August 9, 1909. * peak. QL Gr | Atv’ y) A Ni & 1909.] NATURAL SCIENCES OF PHILADELPHIA. 321 /7 7 Of .< THE POLYCHZTOUS ANNELIDS DREDGED BY THE U.S. S. ‘‘ALBATROSS”’ OFF THE COAST OF SOUTHERN CALIFORNIA IN 1904./ I. SYLLIDZ, SPHERODORIDE, HESIONIDEZ AND PHYLLODOCIDE. BY J. PERCY MOORE. sie Until in 1904 the U. 8. Bureau of Fisheries, the University of Cali- fornia, and Stanford University joined forces in initiating an investi- gation of the marine biology of California upon a comprehensive scale, most of the faunal work done on the invertebrates of that region had been limited to the littoral zone, and much of it had been of a local or desultory character. Early in that year the Fisheries steamer ‘‘ Albatross’? was detailed to investigate the deeper waters off the coast of the southern half of the State. From March 1 to April 15 collections and physical obser- vations were made at 139 dredging stations in the region south of Point Conception, chiefly in the vicinity of San Diego and among the Santa Catalina and Santa Barbara Islands. Between May 10 and June 15, 128 dredging stations were established in Monterey Bay, making 267 in all. The full data relating to these stations have been compiled and published as Fisheries Document No. 604, Washington, 1906. Among the material gathered is a rich but rather indifferently preserved collection of Polycheta which was submitted to the writer for study, especially through the interest of Prof. Charles H. Gilbert, of Stanford University. Coming from the deeper waters, this collec- tion admirably supplements the shore collections from the vicinity of San Diego and Monterey Bay contained in the Stanford University Museum and already reported upon in these ProceEepiINnGs. It had been expected that the bulk of the collections would be made up of known shore forms, but the large number of undescribed species encountered in the families already studied has dispelled that anticipation. Types of new species are to be deposited in the National Museum, and sets of cotypes and duplicates, as far as possible, also in the codperating Universities and this Academy. SYLLIDZ. Syllis alternata Moore. This species is the most common syllid in the collection and oecurs 322 PROCEEDINGS OF THE ACADEMY OF [June, at depths of from 33 fathoms to 1,400 fathoms and chiefly among the Santa Catalina and Santa Barbara Islands. The largest and best preserved specimens are 40-44 mm. long and have 125 to 137 segments, but some are only 12-20 mm. long. In some the eyes, and particu- larly the posterior pair, are enlarged until those on each side nearly meet. There are indications that this condition may be correlated with bathymetrical distribution, the approximation being most marked in the examples from the greatest depth and least in those from more shallow waters. When contracted the notocirri exhibit a distinct thickening above the base, when extended they taper nearly uniformly from the base, but in all cases the alternation in length is obvious. Some ex- amples have the anterior twenty or so segments each marked by a dusky band, not narrow and sharply defined as in S. armallaris, but broad and ill defined. The accessory tooth of the seta appendages is frequently much worn or nearly obsolete, causing the tips to appear simple. In no case do the appendages exhibit any tendency to unite with the stems, as in Pionosyllis elongata Johnson and other species of the Synsyllis group. The chitinous lining of the pharynx terminates in a thickened, some- what crenulated border, behind which is a circle of soft papillae and dorsally a large, blunt, conical tooth. In the retracted state the tooth lies in somite III, the gizzard in XI-N XVII, the esophageal loop in XVIII and the ceca in XVII and XVIII. S. californica Kinberg may be this species, but no certainty can be reached from the brief diagnosis. The Husyllis tubifex Gosse reported by Treadwell from near Monterey Bay is very probably this species. S. violaceo-flava Grube is another related species from the Philippines. Stations 4,326, off Point La Jolla, near San Diego, March 8, 280 fathoms, green mud; 4,400, between San Diego and San Clemente Island, April 8, 500 fathoms, green mud; 4,420, off San Nicolas Island, April 12, 33 fathoms, fine gray sand; 4,427, off Santa Cruz Island, April 14, 447 fathoms, black mud and stones; 4,430, off Santa Cruz Island, April 14, 197 fathoms, black sand and pebbles; 4,574, off Cape Colnett, Lower California, October 8, 1,400 fathoms. Syllis (Ehlersia) heterocheta sp. nov. Pl. XV, figs. 1-4. Described from the type only, a small complete specimen 9 mm. long, with a width, in the region of the gizzard, of body of .4 mm. and between tips of parapodia of .7 mm. Segments 80. Prostomium (Pl. XV, fig. 1) pentagonal, with very unequal sides, the posterior longest and nearly straight, the lateral shortest and 1909.] NATURAL SCIENCES OF PHILADELPHIA, 323 convex, the anterior meeting in a rounded apex; about twice as wide as long. Eyes three pairs, forming a triangular group on each side; the middle pair with distinct lenses and much the largest, but not more than one-ninth the width of the prostomium and situated about their diameter from its lateral border; the posterior also with lenses, di- rected dorso-caudad, about one-fourth the diameter of the middle pair and situated medio-caudad of them; the anterior! mere specks of pig- ment without lenses situated in line with the posterior pair and equally distant from the middle pair. Behind the posterior pair is a large black blotch on each side. Palps prominent, projecting straight for- ward, separate to the base, about one and one-half times as long as the prostomium, broad at the base where they equal one-half the width of the prostomium, thence diverging slightly and tapering to the rather slender, bluntly rounded tips. Median tentacle arising posterior to middle of prostomium between middle pair of eyes, lateral tentacles close to base of palps laterad of anterior eyes; both slender, little tapered, subequal, reaching about one-fifth of their length beyond palps, strongly moniliform except at base, with twenty to twenty-two joints. Peristomium (Pl. XV, fig. 1) a short but distinct ring bearing two pairs of tentacular cirri similar to cephalic tentacles but with distinct ceratophores, similar to the cephalic tentacles; the dorsal equal to the latter and with twenty or twenty-one joints, the ventral two-thirds as long with fourteen or fifteen joints. Segments all distinct, short, uniannulate, slightly depressed, increasing in width to near the middle. Pygidium a broadly expanded, furrowed ring whose cirri have been lost. Parapodia (Pl. XV, fig. 2) of a length generally about one-third the width of their segments. Neuropodia thick, little compressed and little tapered, divided distally into a low postsetal lip which curves over and encloses the ends of the acicula, and a slightly longer presetal lip, the supraacicular portion of which is a small, blunt, projecting lobe forming the dorso-distal angle of the neuropodium. Posteriorly this lobe is much reduced and the postsetal lip becomes longer and more pointed. Neurocirri nearly free from base of neuropodia; their cirrophores small and indistinct; styles slender, tapered, blunt, longer than neuropodium and with a swelling on the dorsal side above the base. Posteriorly they become more slender. Notocirri strongly moniliform and very distinctly jointed (though the joints become cylindrical rather than spheroidal or ellipsoidal) even to the caudal ‘Omitted from the figure. 324 PROCEEDINGS OF THE ACADEMY OF [June, end; cirrophores short but generally distinct. Those on II and V are the longest, about one and one-half times the dorsal tentacular cirrus and exceeding the greatest width of the body; they have twenty- four to twenty-seven joints; III and IV are slightly longer than the dorsal of I and have nineteen to twenty-two segments. The remaining notocirri are more or less regularly alternately longer and shorter even to the caudal end, the longer in general equalling about three-fourths the width of their segments and the shorter about three-fifths their width. Those in the middle of the body have about sixteen or seven- teen (fig. 2) and eleven to thirteen (fig. 2a) joints respectively. Acicula (Pl. XV, fig. 2) of anterior parapodia in a row of six or seven, the ends of which appear in a groove at the dorso-distal angle of the neuropodia. They are pale yellow, rather stout, tapered and end in blunt points, slightly knobbed and variously slightly bent or even hooked; middle neuropodia have three or four and posterior only two. Setze in rough, irregular subacicular fascicles of about seven rows of three or four each. They are colorless with rather long, curved shafts slightly enlarged at the distal end (Pl. XV, fig. 3) to form simple, oblique articulations roughened by a few minute points. Appendages of all except the sete of the dorsal row comparatively short (fig. 3), two to four times the length of the oblique end of shaft, scarcely curved and not hooked at the tip, which is a simple point below which is sometimes an obscure accessory tooth; margin strongly toothed. Setze of dorsal series and sometimes one or two of the next row more slender (Pl. XV, fig. 4) with very long, slender, straight appendages usually about four times the longest of the lower rows, with blunt _ends (fig. 4b) and finer marginal denticulation (fig. 4a). Such sete continue to the caudal end and are similar on all segments. Many of the posterior parapodia also bear a single stout, nearly straight, spine- like simple seta, as long as the shafts of the others, in the dorsal part of the bundle; it is probably to be regarded as a prolonged aciculum. Proboscis (Pl. XV, fig. 1) protruded about one-third of its length beyond palps, broad cylindroid, diameter exceeding prostomium, cuticle thick, smooth and entire at orifice; dorsal tooth stout and blunt, probably from wear; behind this is a circular fold bearing eight (or nine?) distant, soft, rounded papillae. Gizzard reaches from IX to XXI and has thirty-seven rings. Colorless in alcohol. The only specimen was taken at Station 4,423, off San Nicolas Island, April 13, 339 fathoms, gray sand, black pebbles, shells. Syllis (Ehlersia) anops Ehlers, from the Straits of Magellan, is a much more elongated species with the anterior and posterior dorsal 1909.] NATURAL SCIENCES OF PHILADELPHIA. 325 setze appendages differing in form. S. singulisetis Grube, from the Philippines, also belongs to the subgenus Ehlersia, but has only four eyes. Pionosyllis typica sp.nov. Pl. XV, figs. 5-7. Form moderately slender, widest in the region of the gizzard, from which it tapers regularly to the caudal end. The well-extended and complete type has 96 segments and is 31 mm. long and 1.2 mm. in diameter at XXV. Prostomium small, somewhat sunken into peristomium, about one and two-thirds times as wide as long, the greatest width posterior, the sides and front broadly and regularly rounded. Eyes two pairs, dark brown, small, anterior pair close to lateral border and about midway of length of prostomium; posterior pair little more than one- half diameter of anterior and slightly behind and within them. A pair of faint ridges run from the posterior eyes to the posterior border of the prostomium, nearly completing with the eyes a V-shaped figure. Palps completely separated to base, bent somewhat ventrad, broadly triangular with rounded angles, about as long as prostomium and basal width about two-thirds length. Median tentacle arising between posterior eyes, about one and one-fourth times as long as prostomium and palps, slender and slightly tapered, divided into about twenty- four articles, distinct distally but obscure toward the base, not strongly moniliform. Lateral tentacles similar, arising from a slight depression just anterior to anterior eyes, nearly three-fourths as long as median and reaching nearly as far, divided into nineteen or twenty joints. Mouth rather large with prominent crenulated lips. Peristomium short and partly crowded beneath prostomium, but visible for entire width of dorsum. Tentacular cirri similar to tentacles, the dorsal slightly exceeding median tentacle in length, with about twenty-six joints; the ventral somewhat shorter, with twenty joints. Body segments nearly terete, remarkably regular but separated by shallow, inconspicuous furrows ; except for a few short anterior ones they are half as long as wide or more. From the maximum width at the end of the first fourth they taper regularly to the pygidium, which is a small ring and bears one of a pair of cirri as long as the last nine segments and resembling the posterior neurocirri in being scarcely articulated. Parapodia (Pl. XV, fig. 5) situated at ventral level of body, well separated throughout, slender, rather conspicuous in ventral view but largely concealed from the dorsum. The neuropodia are slightly com- pressed and taper slightly to the bluntly rounded and rather abruptly contracted end, which is divided into two small lips separated by a 326 PROCEEDINGS OF THE ACADEMY OF [June, deep cleft, from which the sets arise and into which the tips of the acicula enter. Neurocirri arise obliquely from basal half of neuropo- dium, cylindrical or slightly tapered to blunt tips reaching well beyond end of neuropodium, especially on anterior segments. Notocirri arise from rather prominent but indistinct cirrophores immediately above base of neuropodia and all at same level. Styles all approxi- mately of one length, about two-thirds width of body, the anterior and alternate ones scarcely longer than the others, but the alternate ones carried erect. Anterior notocirri are somewhat articulated, similarly to the tentacles, but this character becomes more obscure toward the base and on more caudal cirri; most of them are rather stout, rather quickly tapered and more or less transversely wrinkled, rather than jointed. Near the caudal end they become much reduced in size. Acicula number from five or six anteriorly to two or three posteriorly ; pale yellow, tapered, the ends blunt and very slightly knobbed (Pl KEV), fig, (6): Setze generally about twelve or fifteen, in oblique, spreading, fan- shaped tufts; colorless, the stems long, slender, curved, the ends (Pl. XV, fig. 7) shghtly enlarged, oblique, with four or five Just per- ceptible teeth on the convexity of the front face and a slight shoulder behind. Appendages moderately long, varying from three times diameter of distal end of stem in ventral to five times its diameter in dorsal setew, except at the posterior end, where all are shorter. They (fig. 7) are of peculiar form with very oblique base, beyond which the width remains nearly uniform; distally abruptly truncated and ending in a stout oblique spur, above which is a delicate curved tooth often nearly worn away; a very fine marginal fringe ending in a more prominent tuft of hairs. This species stands closer to the type species than any of the three already described from the Pacific coast of North America. Johnson’s species, P. elongata, appears to be more properly referred to Synsyllis Verrill. Much confusion in the usage of the genus exists among authors. Station 4,430, off Santa Cruz Island, April 14, 197 fathoms, black sand and pebbles. Two specimens. Pionosyllis gigantea Moore. About forty anterior segments of a specimen of this large species from an unknown locality. As noted above it is doubtful if this species really belongs to Pionosyllis. Trypanosyllis intermedia Moore. Owing to the deficiencies of the type the original description of this species is incomplete and may be added to here. 1909. } NATURAL SCIENCES OF PHILADELPHIA, 327 A complete specimen with 230 much contracted segments is 60 mm. long, with a maximum body width of 3.2mm. at XXX. Prostomium subquadrate, slightly wider than long; with a deep postero-median dorsal incision and furrow. Palps completely separated to base, slightly longer than prostomium, somewhat divided into basal and terminal portions; the former somewhat swollen and the latter slender and abruptly bent ventrad. Median tentacle five or six times length of prostomium and composed of fifty-six very short joints; lateral tentacles about one-half as long, with thirty-five to thirty-eight joints. Eyes on each side nearly or quite coalesced. ‘Tentacular cirri arising beneath prostomium, the dorsal nearly equal to median tentacle, with fifty joints; the ventral slightly shorter than lateral tentacle, with about thirty-five joints. Notocirrus of II the longest, about one-third more than the median tentacle, with sixty-four to seventy joints; that of III scarcely shorter and of IV two-thirds as long as II. Following this the notocirrophores of odd-numbered segments are at a slightly higher level and bear slender styles as long as the width of their segments and with as many as sixty or seventy very short joints; those of even-numbered segments have styles about two-thirds as long. Pygidium a tapered ring bearing a pair of slender cirri as long as its diameter and with twenty-five to thirty Joints. A pharynx dissected had the circle of teeth in somite VIII; there are eighteen to twenty slender compressed soft papillee and apparently as many teeth, but the latter are so much broken that this cannot be determined with certainty. Gizzard in XVIII to XXIX with thirty- five distinct and seven or eight indistinct rings. The anterior thirty-five or forty segments are reddish-brown above with pale intersegmental lines. One specimen each from stations 4,417, off Santa Barbara Island, April 12, 29 fathoms, fine yellow sand, rock and coralline; and 4,420, off San Nicoias Island, April 12, 291 fathoms, gray mud and rock. Odontosyllis phosphorea sp. noy. Pl. XV, figs. 8-10. Epitokous, sexually mature examples, unfortunately much dis- torted and broken. The type and largest specimen lacks some of the caudal segments and measures 23 mm. long, 2.5 mm. in maximum width between tips of parapodia and 1.5 mm. in width of body only. The anterior region of twenty-three segments is 4.6 mm. long, the middle of fifty-one segments provided with swimming notopodial sete is 17 mm., and only four segments of the posterior region remain, mak- ing seventy-eight segments in all. A smaller, more extended and 328 PROCEEDINGS OF THE ACADEMY OF [June, posteriorly complete cotype is 18 mm. long, the anterior region being 5mm. and the posterior 5.5mm, Segments 23 + 26 + 31 = 80. Form rather short and stout, widest at the middle, the ventral sur- face flat, the dorsal more or less arched, most so in the anterior region, which is nearly as high as wide; the middle and posterior regions depressed. Prostomium small, short, bent downward, subprismatie with rounded angles, about two-thirds as long as wide and deeper than long, the front abruptly vertical, somewhat excavated for the tentacles. HKiyes two pairs, moderately large with large lenses, brown, occupying sides of prostomium, the anterior pair directed chiefly forward, the posterior upward. Though themselves distinct they are enveloped in an irregular curved, broad band of black pigment which occupies most of the lateral and posterior dorsal part of the prostomium. The three tentacles arise close together, the median more dorsal, from a depression in the middle of the frontal face, small, slender, unjointed, subequal, somewhat exceeding length of prostomium. Palpi directed ventrad, thick, fleshy separated knobs. Peristomium achetous, largely concealed by prostomium, only a very short dorsal ring and larger lateral prominences showing. ‘Two pairs of tentacular cirri, unjointed but transversely wrinkled, the ventral about as long as width of prostomium, the dorsal about one | and one-half times as long. The nuchal fold arises from the dorsum of II and is a prominent, semicircular, deeply pigmented, free, mem- branous flap, with a basal width equal to one-half the segment and covering the posterior part of the prostomium as far as the anterior eyes. Somite II and remaining setigerous segments are uniannular and well marked by irregular furrows, differing in the several regions as indicated above. Pygidium a small, low, dome-shaped ring having a pair of short, thick fusiform cirri. Parapodia, owing partly to the contraction of the specimens, very little prominent, those of the anterior and posterior regions uniramous (Pl. XV, fig. 8), of the middle region biramous (fig. 9). Neuropodia short, stout, with blunt ends, terminating in two short, thick, rounded lips, of which the postsetal is usually slightly the longer; both termi- nating dorsally at the acicula, which lie slightly below the dorsal border of the neuropodia. In the middle region the neuropodia (Pl. XV, fig. 9) are somewhat longer than in the anterior region, but otherwise similar. The notopodia are low, flattened protuberances pushed out anterior to the seta tuft into a pointed, conical acicular process. In the posterior region the parapodia are neuropodial only and are gradually 1909.] NATURAL SCIENCES OF PHILADELPHIA. 329 reduced in size. Neurocirri arise from beneath the base and rather on the posterior face of the neuropodia, and have somewhat swollen bases and a small, slightly distinct distal piece reaching about as far as the end of the neuropodium, They are similar on all parapodia. Notocirri arising from low swellings (but not distinct cirrophores) on the dorsum well above the parapodia. Styles rather long, slender and unjointed, but more or less wrinkled. The first (on IT) is longer than the others, about twice the dorsal peristomial cirrus and about one and one-third the width of the segment; that of III is less than two-fifths, of IV about three-fifths and of V about seven-eighths of that of IL; remaining notocirri are alternately longer and shorter, those in the middle region being respectively about equal to three- fifths and one-third the width of their segments. Neuropodial acicula generally two in anterior, three in middle region, moderately stout, straight, tapered, the ends slightly knobbed. Notopodial aciculum single, slender, gently tapered and curved, the distal end slightly knobbed and often bent at the end. Neuropodial sete entirely subacicular, in dense fascicles of several ranks, rather numerous, usually ten or eleven ranks of three or four each. They are colorless, rather stout, with curved stems becoming thicker distally and ending obliquely in a blunt, slightly roughened point (Pl. XV, fig. 10). Appendages short broad blades varying in length only from once to twice the width of the distal end of the stem, the longest occur- ring in anterior parapodia and the ventral part of the bundles, termi- nating in a prominent hook, well below which is a stout spur. In the posterior region a solitary slender, curved simple seta also occurs in each fascicle, but has not been detected elsewhere. A dissected proboscis exhibits the characteristic thick bow and fold of the chitinous rim, but the number and character of the teeth is not evident. The gizzard of the same specimen has sixty-seven annulations. Color pale yellow with a conspicuous spot on the prostomium, the nuchal fold and narrow intersegmental transverse lines black; in the middle and posterior regions every fourth one of the latter is much wider and denser, and at these deeply pigmented furrows the frequent fractures of the body-walls always occur; appendages colorless: eyes brown. The label reads: ‘‘ Phosphorescent annelids caught at surface, Avalon Bay, Catalina Island, evening, April 11, 1904, Albatross.”’ Professor William 8. Ritter writes that a phosphorescent annelid swarms at the surface of San Diego Bay. Doubtless this is the species here described. It is a frequent characteristic of species of this genus to be luminiferous. 330 PROCEEDINGS OF THE ACADEMY OF [June Syllid gen. et sp.? A small syllid, probably a true Syllis or Eusyllis, from an unknown station, cannot be identified, and its characters are put on record for the use of a future describer. Length 11 mm., segments 72. Prostomium nearly twice as wide as long, rounded laterally, slightly convex anteriorly and nearly straight posteriorly. Eyes very imper- fect (probably abnormal), represented by a minute speck of pigment close to the base of the palp on one side, and a larger but still very small eye with a lens on the other side. No trace of tentacles remains, but it seems very improbable that they should be normally absent in a syllid of this type. Palps projecting forward and curved downward pistally, free, broad, subelliptical, flattened, their length nearly equal to width of prostomium, and their combined width exceeding that of prostomium, Peristomium very short above, swelling to a broad lip at the sides and below. An incomplete, strongly moniliform, dorsal tentacular cirrus with seventeen joints remaining exists on one side, but the others are lost. Body strongly arched anteriorly, but more flattened behind. First twelve segments very short and separated by deep furrows, the others becoming longer until in the middle region they are one-fourth as long as wide. Pygidium a very short ring with a slight median lobe, bear- ing a pair of very long, slender, moniliform cirri as long as the last twelve segments and consisting of more than forty Joints; in addition there is a very minute unjointed median cirrus. Parapodia small, the neuropodia cylindroid, little compressed, truncate, the distal end divided into nearly equal, short, thick, rounded presetal and postsetal lips. Neurocirri rather slender, tapered, un- jointed, blunt, reaching slightly beyond end of neurocirri. Notocirri arising from prominent swellings and small cirrophores well above neuropodia; very long, flexible, very strongly moniliform, alternately longer (on odd-numbered segments) and shorter (even-numbered segments). At the anterior end mostly lost; on middle segments the short ones exceed the width of their segments and have thirty-five or forty joints, the long ones are twice the width of their segments and have fifty to fifty-five joints. Even near the caudal end they are not much shorter, the longest having forty or more joints and the short ones twenty-five or thirty. Acicula three or four in a row ending at the dorso-lateral angle, pale yellow, tapered to blunt, slightly knobbed tips. Setze few, seldom 1909. ] NATURAL SCIENCES OF PHILADELPHIA. dol exceeding ten or twelve and oftener fewer, colorless, transparent, with rather stout, curved stems, terminating in enlarged, oblique ends which appear to be quite smooth. Appendages usually about twice as long as the oblique end of stem, with straight, simple points and strongly developed marginal fringe. Parapodia of the last thirty segments at least bear a single simple spine which projects prominently from the dorsal part of the bundle. It has about twice the thickness of the compound set, is very slightly curved and ends in a blunt point. The most posterior project very prominently to quite the leneth of the compound sete; further forward they are less conspicu- ous, and anterior to XL none can be detected. Proboscis retracted and on account of the opacity and pigmentation of the anterior end difficult to see. It appears, however, to have a smooth margin. Gizzard in XV to XXII, with thirty-four rings. Color anteriorly pale brown owing to numerous granules in the integument, passing through yellow into a nearly colorless posterior end. Autolytus sp.’ A single example of a stock regenerating behind and incomplete from the loss of many of the appendages. Length 16 mm., width between tips of parapodia 1.4 mm.; segments 85 with a narrow regenerating bud of 13 segments. Prostomium broadly ellipsoid, anterior and posterior borders nearly straight, sides prominently convex; with the palps as seen from above the outline nearly circular. Eyes two pairs with lenses, the anterior nearly black, diameter about one-fifth width of prostomium, located midway of the length of prostomium at its lateral borders, looking outward and a little downward and forward; posterior brown, about one-half diameter of anterior, with which they are in contact on the dorso-postero-median side. Palps completely coalesced to tips, but having a depressed median line and barely perceptible distal emar- gination. Median tentacle lost, but one lateral tentacle present, arising just above base of palp nearly in line with anterior eye, coarse, little tapered, its length six or seven times prostomium and palps, but much twisted and probably incomplete. Peristomium bearing large cirrophores, but only the ventral style of one side remaining, this being one-half the length of the lateral tentacle. Anterior segments imperfectly separated, the furrows shallow; width increasing for about twenty segments to the gizzard region and then nearly uniform to the end. A wedge-shaped median elevation with apex at the peristomium extends over the first six or 332 PROCEEDINGS OF THE ACADEMY OF [June, seven segments, and is bounded by the divergent epaulettes which ex- tend caudad from the peristomium and have pigmented borders. The regenerating region is quite small, barely a mm. in length and about one-fourth that in width, and ends in an unsegmented blunt pygidium without cirri. Parapodia, as usual in the genus, short, thick, ventral in position, lacking free neurocirri which become coalesced with the neuropodia to form opaque ventral swellings; neuropodia terminating in short, thick, presetal and postsetal lips. Notocirri with large cirrophores, often as large as the neuropodia; styles unjointed, coarse and similar to the tentacle, very easily detached and many missing. That of II very long, about twice the lateral tentacle and reaching to about XX; that of III about one-half as long; the others much shorter, the longest about one-half IIE or about width of body. Acicula four (on one parapodium studied), tapered to blunt points. Setze forming rather dense tufts, colorless, the shafts rather stout, strongly curved, distally enlarged and near the articulation denticu- lated on both faces. Appendages little longer than oblique end of shaft, triangular with bidentate ends, the anterior tooth larger and somewhat hooked. No teeth visible at end of retracted proboscis, cesophagus scarcely looped; gizzard in XNX-NXVIII, apparently about thirty-three rings. No color. The single specimen comes from an unknown station. SPHA2RODORID A. Although at least five generic names have been applied to the few known species of this very small family, it seems that the forms possess- ing compound sete still lack proper generic designation. Indeed, if the synonymies published by European authors be correct, all of these names are based upon a single type species. As each was originally proposed for a single species, there is no difficulty about fixing the types. Three names were proposed in 1843: Ephesia Rathke for E. gracilis Rathke (n. sp.), Spherodorum Oersted for S. flavum Oersted (n. sp.) and Bebryce Johnston for P. peripatus Johnston (n. sp.). Hphesia was previously used by Hiibner in 1816 for a genus of Lepidoptera, and Bebryce is preoccupied by Bebryce Philippi, 1842. Nothing in the descriptions of the types serves to differentiate them; they all certainly have simple sete and lack spherical organs other than those directly related to the parapodia. Two years later Johnston, discovering the earlier use of Bebryce, substituted Pollicita, but admits the prob- 1909.] NATURAL SCIENCES OF PHILADELPHIA. 333 able identity of his type species with Spherodorum flavum Oersted. Perrier in 1897 proposed Hypephesia for species with simple sete, naming H. gracilis as the type. Levinsen employs Ephesia to include both typical species with simple setze like 2. gracilis Rathke and forms with compound sete like FE. peripatus Claparéde (non Johnston), while Spherodorum is retained for those species which bear several series of spherical append- ages with granular contents and which have the sete compound, like S. claparedii Greeff. St. Joseph, on the other hand, prefers to sepa- rate the genera on the basis of sete characters, ranging under E’phesia species with simple sete and under Spherodorum those with the sete compound. Finally Perrier recognizes the three generic types apparent in the family, retains Levinsen’s application of Spherodorum but divides his Ephesia, unfortunately applying that name to the EF. peripatus group and giving a new name (Hypephesia) to the typical FE. gracilis with simple sete. It is evident, therefore, that Sphewrodorum is the proper name for the papillated forms with simple setz only, and, so far as I am aware, no distinct tenable generic names are in existence for the two types with compound sete. The present collection includes a species of each of the three types known in the family, but all are provisionally placed in the genus Spherodorum, a proceeding that may be justified because the known number of species is so small that no confusion will result from plac- ing all in a single genus, because increased knowledge of the species of the family may make known forms possessing intermediate characters, and because the relationships of the Spherodoride have been so variously conceived that it is possible that other generic names have been overlooked. Spherodorum papillifer sp. nov. Pl. XV, figs. 11, 12. Moderately slender, tapering both ways, the greatest width nearer the anterior end, subterete, but somewhat depressed and flattened below. Length of type 30 mm.; maximum diameter at end of anterior two-fifths 1 mm.; segments 102. Other specimens one or two milli- meters shorter. Anterior end blunt, the prostomium and peristomium retracted and difficult to distinguish, the former a very short, simple, slightly domed lobe studded with papillae and without definite appendages, though three papille longer than the others may represent the tentacles and a pair of mammilliform papille the palps. _Peristomium a simple, not clearly differentiated ring surrounding the mouth and bearing a pair J34 PROCEEDINGS OF THE ACADEMY OF [June; of small globoid cirri. On the dorsum is a <-shaped group of con- spicuous black eye-spots which extend on to somite II. Typically there seem to be two pairs, but frequently there is an additional pair of spots or a median spot anteriorly. Segments short and uniannular or slightly and irregularly annulated, mobile and irregularly contracted in the different regions; posteriorly becoming very small and tapering into a minute pygidium which bear a pair of spherical cirri with small apical papille and in addition a minute median cirrus or papilla. Surface, particularly toward the ends of the body, bearing numerous small, pointed or somewhat clavate retractile papille which are evidently of a sensory nature and become larger in the neighborhood of the parapodia. Parapodia (Pl. XV, fig. 11) rather inconspicuous, lateral, probably uniramous. They consist of a slender, conical setigerous neuropodium roughened with small, conical, sensory papillae becoming longer towards its distal end, which terminates in an especially prominent one or postsetal lobe. A much stouter process arising from the postero- ventral region of the neuropodium, having nearly the structure of the sensory papille, is undoubtedly the neurocirrus. Quite distinct from and well dorsad of the neuropodium is a spherical prominence (noto- podium?) bearing on the middle of the distal face a small clavate cirrus. The spherical body is largest and most conspicuous on middle segments, but the distal cirrus is larger, both relatively and absolutely, at the ends. These organs are enveloped in a thick cuticle and the interior is filled with a snarl of slender, elongated bodies and opaque brownish granules, giving to the entire organ its characteristic opacity. A short distance farther dorsad is a clavate papillz similar to that borne by the spherical body but more slender and elongated, especially on middle segments. Neuropodial aciculum single—a rather stout, yellowish, tapered spine ending in a simple, blunt, somewhat projecting point. Seti few, about four to six, projecting unequal distances in an irregular fascicle in each neuropodium (fig. 11). All are simple, colorless, rather stout, the shafts straight or nearly so, the ends expanded into a blade- like extremity with a knife-like edge rising into a slightly curved point and passing at the base into a slightly differentiated lateral spur. They exhibit little variety in shape or proportions (Pl. XV, fig. 12). Proboscis unknown. Color nearly uniform pale yellow, faded, the eye-spots deep brown. Six specimens from station 4,400, off San Diego, April 8, 500 fathoms ereen mud. 1909. ] NATURAL SCIENCES OF PHILADELPHIA. 335 , One is a female filled with large eggs distinctly visible to the naked eye; the others, including the type, appear to be males. Spherodorum brevicapitis sp. nov. Pl. XV, figs. 13, 14. Although considerably larger this species closely resembles SS. papillijer in general appearance. The type and only specimen, much contracted and distorted, is 39 mm. long, with a maximum diameter without parapodia of 1.6 mm., and has 96 segments. Owing to the partial protrusion of the proboscis as a soft bulbous structure the prostomium is crowded dorsad. It appears as a very slight, scarcely distinguishable lobe, bearing scattered papille, of which five, though still small, are larger than the others; three of these are very close together near the anterior margin of the lip; the others are separated by a considerable interval on each side. Peristomium likewise indistinct—a short achztous ring bearing a minute mammilliform papilla on each side. A pair of rather large, widely separated pigment spots, the remains of a pair of eyes, lies partly on this segment but chiefly on III. Owing to the condition of the specimen little can be determined about the normal appearance of the segments. The cutaneous papille, however, are less numerous and smaller than in S. papillifer. They are scattered fairly uniformly over the surface, becoming more numerous on the parapodia. Pygi- dium a minute ring bearing a pair of low, broad, mammilliform papille, besides at least two small, simple papille. Parapodia (Pl. XV, fig. 15) in general similar to those of S. papillijer, but the parts more widely separated and the neuropodia more slender and cylindrical with a conical apex, rather than simply conical, and ending in a small postacicular lobe. Neurocirri small, subconical processes arising from the posterior ventral side of the neuropodia just at the base of the terminal cone. Spherical organ prominent, with a thinner cuticle than in S. papillifer, and the papilla borne on the ventral side of the base instead of on the outer surface. Dorsal papilla (noto- cirrus) well above spherical organ, small, claviform, with a widened base. Aciculum single, rather more slender than that of S. papillijer. but similar in form, colorless, the blunt-pointed tip projecting freely. Sete in irregular fascicles of usually eight or nine, rather prominent, all compound or semi-compound, becoming widened and flattened distally and then tapering into a hooked tip or appendage which is articulated to the stem by an oblique joint, the absence of which would leave these setee very similar to those of S. papillifer (Pl. XV, fig. 14). 336 PROCEEDINGS OF THE ACADEMY OF [June, Proboscis—see above. Color slightly yellowish; opaque from pres- ence of sperm-balls with which ccelom is packed. . Type only, from.station 4,395, off Santa Catalina Islands, March 31, 2,045 fathoms, blue-gray mud. Spherodorum spherulifer sp. noy. Fragment of caudal end of a species related to S. claparedii Greeff, but with the large spherical bodies more numerous. It is dark brown and very opaque. Each segment bears on the dorsum two or three pairs of large, and alternating with them smaller, spheroidal bodies, all partially united at their bases into a somewhat irregular trans- verse ridge. The smaller numbers are at the posterior end, and they increase regularly as far as the piece extends to the middle segments. Several similar but smaller bodies occur on the venter. Neuropodia generally similar to those of S. brevicapitis, but the very extensile neurocitri and postacicular lobes are much larger, a papilla appears to be absent from the notopodial organ and the first (a smaller one) of the transverse series of dorsal appendages may be the notocirrus of each segment. Seta compound, similar to those of S. brevicapitis, but with the joint more distinct and the appendage somewhat longer. The single specimen, included among some invertebrates presented to the Academy by Professor Harold Heath, was taken from a deep- sea fish-line in Monterey Bay on July 16, 1902. HESIONIDA. Podarke pugettensis Johnson. About a dozen specimens with up to fifty-eight segments and except for the eyes devoid of pigment. One is regenerating the caudal end. Many have the proboscis, which has not been described, protruded. It measures about 1.5 mm. long and half as wide, the basal two-thirds swollen, bulbous and smooth, the distal portion subcylindrical or trun- cated conical and more or less compressed; terminal orifice a vertical slit surrounded by eight or ten faintly marked small papille. The first mention of this species in literature is under the name of Ophiodromus by Harrington and Griffin as a parasite on Asterias in Puget Sound. San Diego Bay, Beacon No. 3 Shoal, March 1, 1904. PHYLLODOCIDA. Phyllodoce mucosa Versted. This species, already recorded from the North Pacific, appears to be common off southern California. Most of the specimens are well 1909.] NATURAL SCIENCES OF PHILADELPHIA. 337 preserved and agree closely with typical examples of the species taken in the North Atlantic at Labrador and Greenland, as well as with the figures of Malmgren and other European authors. The only apparent difference is that the Pacific examples may have one or two more papil- lz in some of the rows on the proboscis, most of them having 11 or 12 in the upper and lower and 13 or 14 or rarely 15 in the middle rows. None shows any trace of a median dorsal series, but the other papille are prominent and generally have a conspicuous brown spot on the posterior face. The form of the prostomium is very changeable and may be pyramidal, ovate or deeply cordate, but is always’more or less emarginate posteriorly. The nuchal papilla is minute and inconspicu- ous. Several specimens are regenerating lost caudal ends and one is filled with eggs. Seven specimens from station 4,399, off San Diego, April 7, 245 fathoms, fine gray sand and rock; and one from each of the following: 4,445, Monterey Bay, May 11, 66 fathoms, green mud; 4,476, same, May 16, 39 fathoms, soft green mud; 4,482, same, May 17, 43 fathoms, soft green mud; 4,485, same, 108 fathoms, soft green mud and sand; 4,519, same, May 26, 35 fathoms, hard gray sand; 4,548, same, June 7, 46 fathoms, coarse sand, shells and rock. Phyllodoce medipapillata Moore. The median dorsal series of proboscidial papille is always well developed and quite as conspicuous as the others. Besides this charac- ter this species is distinguished from the related P. mucosa by having the setze appendages much shorter and the notocirri ovate-lanceolate instead of truncated as in that species. The large specimen is just 100 mm. long with 201 segments. A single example was collected at each of the following stations: 4,420, off San Nicolas Island, April 12, 33 fathoms, fine gray sand; 4,460, Monterey Bay, May 12, 55 fathoms, green mud, gravel; 4,558, Monterey Bay, June 9, 40 fathoms, rock. Phyllodoce ferruginea sp. nov. Pl. XV, figs. 15-18. Two complete specimens of nearly equal size. The type measures 46 mm. long, .7 mm. in maximum width of body and 1.2 mm. between tips of parapodia; 148 segments. Very slender, nearly linear, widest about end of anterior third, somewhat depressed. Prostomium (Pl. XV, fig. 15) regularly elliptical, about five-sixths as wide as long, slightly depressed, slightly truncated at both ends and with a very slight posterior median emargination, strongly convex above. Eyes one pair, brown, very large with prominent lenses, 338 PROCEEDINGS OF 'THE ACADEMY OF [June, their diameter nearly one-third width of prostomium, situated just posterior to middle of length close to posterior borders of prosto- mium and looking dorso-laterad. Frontal tentacles arising by re- stricted bases, widely separated on antero-lateral borders of prosto- mium, long, slender and subulate, tapered regularly from above base to slender tip; the dorsal one and one-half times or more the length of prostomium, the ventral about as long as prostomium, Study of additional material may modify the last statement, as some of the tentacles of both specimens have evidently suffered injury and one (type) has two, the cotype one, in regeneration as small knob-like buds. The cells of the prostomium form a small rosette-like radiation anterior to the eyes, but there is no indication of a median tentacle. Peristomium completely crowded beneath prostomium, projecting as lateral lobes merely, from the upper part of which arise the two pairs of tentacular cirri. No nuchal papilla. Posterior lip prominent. Somites If and III very short but distinct, except that ventrally the former coalesces with the prostomium to form the lower lip. Tentacu- lar cirri (fig. 15) all unusually long and slender, regularly tapered, with well-developed cirrophores. The peristomial arises at about the level ofjthe foliaceous notocirri and reaches to about XII; the dorsal of IT is at a higher level and reaches XVII; ventral of II at a very low level and equals peristomial; that of III at nearly the level of succeeding notocirri and reaches XIV. Three or four small sete arise from a small tubercle between the cirri of Il and a fully developed neuropodium occurs on III. Anterior segments all very short and distinctly biannulate; farther back they become nearly half as long as wide. Pygidium a rather long ring, but cirri wanting. Parapodia (Pl. XV, fig. 16) unusually small, projecting very little from side of body, the neuropodium flattened, with postsetal lip obso- lete and presetal lip large and broadly rounded distally with a very slight notch, from which the point of the aciculum projects (fig. 17). Neurocirrus very strongly foliaceous, broadly subovate, several times larger than neuropodium on all somites, completely concealing them from behind and bending dorsad until on most somites it meets the notocirrus; arrangement of veins radial. Notocirrophores prominent, somewhat flattened domes, two or three times as large at the neuro- podia on middle segments. Strongly foliaceous, thin, imbricated but covering only a small part of the sides of the body, of moderate size but very large in comparison with the neuropodia, broadly cordate with apex bluntly rounded (usually broader at the end than the one figured) and base deeply excavated, with deep yellow-brown veins forming a dense bipinnate figure; rather easily detached. 1909.] NATURAL SCIENCES OF PHILADELPHIA. 339 Aciculum single, nearly colorless, straight, tapered to a point like a sharpened pencil which projects shghtly beyond the acicular notch (fig. 17). Seta rather numerous, in broad, fan-shaped fascicles only obscurely divided into supra- and subacicular groups; 8 + 11 on somite X, 9 + 12 on XXV and-L, 7 + 9 on C of type, They are colorless with moderately long stems scarcely reaching beyond the border of the neurocirri of middle segments, slender and gently curved, rather conspicuously inflated at the ends (Pl. XV, fig. 18) to form a socket bounded by lateral ranks of slender teeth connected anteriorly by a row of much smaller teeth. Appendages rather long, equalling or generally exceeding depth of neuropodia, very delicate with striations and marginal denticulations not. visible under the magnification shown. Color generally rusty, the body pale with little color, the cephalic appendages and neurocirri deeper and the notocirri very brilliant yellowish brown which contrasts strongly with the paler body and gives the worm its conspicuous coloring. Proboscis unknown. Station 4.550, Monterey Bay, June 7, 50 fathoms, green mud, rock. In form of the prostomium and other features this species approaches P. citrina Malmgren. Phyllodoce (Carobia) castanea Marenzeller. A small example 26 mm. long with 106 segments. Like the specimen previously reported from Monterey Bay this one has notocirri some- what more elongated than those of Marenzeller’s Japanese types. The color is paler and more yellowish than in the specimen above mentioned, though, like it, this is a female with eggs. There is no trace of a nuchal papilla and the flattening of the tentacular cirri is very obvious. Phyllodoce polyphylla Ehlers, from South Georgia, is probably closely related to this species, though Ehler’s figure exhibits no setigerous lobe on II, which is very obvious in this specimen. The minute dorsal tentacles shown by the type of P. polyphylla are probably merely the result of these being in process of regeneration after having been lost, as I have seen precisely similar conditions in several species. Station 4,496, Monterey Bay, May 19, 10 fathoms, fine gray sand and rock, ; Anaitis polynoides sp. nov. Pl. XVI, figs. 19-21. Owing to the closely imbricated manner in which the large notocirri overlap the slender body this species bears a superficial resemblance to an elongated Polynoé or even more to a Sthenelais. The single speci- men is complete, but the posterior one-fourth of the body has evidently 340 PROCEEDINGS OF THE ACADEMY OF [June, been recently regenerated—being abruptly unpigmented and of smaller size. Form slender, depressed, the segments scarcely exceeding one-third of total width between margins of notocirri or tips of parapodia. From the maximum width at the end of the anterior fourth the extreme outline tapers slightly forward and regularly and continuously caudad. Length 44 mm.; maximum width of segments 1.6 mm.; total width 3.8mm. Segments 88. Prostomium very short, broad and depressed, decidedly bent down- ward. In the figure (Pl. XVI, fig. 19) the prostomium is represented as pressed upward somewhat, but in the position in which it naturally rests the anterior outline is regularly semicircular and the length (exclusive of the posterior prolongation) about one-half the width. From the slightly convex posterior margin a median prolongation fits into a deep depression in the peristomium and bears a knob-like nuchal cirrus having a diameter about equal to the eyes. Eyes one pair, con- spicuous, circular, brown, about one-ninth or one-eighth the width of the prostomium and widely separated by an interval of about five times their diameter, close to the posterior margin of the prostomium. Frontal tentacles very short, subconical with small terminal append- ages, very widely separated and somewhat reflexed on sides of prosto- mium; the dorsal about as long as one-third width of prostomium and separated by about twice their length; the ventral somewhat longer, nearer together and reflexed so that they are concealed in dorsal views. Peristomium somewhat tumid laterally, but excavated dorso-mediaily for the nuchal projection and papilla, almost indistinguishably coalesced with II which is similarly tumid laterally but lacks a median depression. Tentacular cirri four pairs, rather short, thick, blunt, and stiff. The first (or peristomial) pair scarcely longer than width of prostomium and not reaching beyond IV; dorsal of Il with a much larger cerato- phore and reaching VII; ventral of Il equal to peristomial and that of III (notocirrus) similar to dorsal of II and reaching VIII. Podous segments well defined, very regular, the anterior very short, but soon becoming one-third as long as wide, slightly convex above, flat below, with a shallow neural groove. Posteriorly the segments taper to a very minute pygidium bearing a pair of relatively stout, eylindroid anal cirri, the combined width of which equals that of the pygidium and the length the last five or six segments. Parapodia (Pl. XVI, fig. 20) begin on ITI, strictly lateral, prominent, their length exceeding one-half width of body, toward the ends becom- 1909. ] NATURAL SCIENCES OF PHILADELPHIA. 341 , ing smaller but otherwise unmodified. Strictly uniramal, the neuro- podia compressed, with obsolete postsetal lip and prominent, foliaceous presetal lip divided by an acicular notch into a larger, broadly-rounded, supra-acicular lobe and a somewhat shorter subacicular lobe obliquely tapered to a blunt point. Notocirrophores large, those of all except most anterior segments flattened and auriculate (fig. 20), Notocirrostyles beginning with IV, thin and membranous; typically broadly lunate-reniform, the exter- nal border squarish, very regularly, closely and broadly imbricated, covering and concealing the parapodia and posteriorly the entire dorsum, but leaving the middle of the segments exposed anteriorly. Toward the anterior end the styles approach a circular form and become gradually smaller until practically the entire dorsum is left uncovered. The notocirrus of III is the last tentacular cirrus, while the neurocirrus of the same segment differs in no respect from those following. Neuro- cirrophores prominent swellings at base of ventral side of neuropodia. Neurostyles (fig. 20) oblong elliptical, with the broad distal end sub- truncate, foliaceous, about equalling the neuropodia in size and reach- ing to or, on anterior parapodia, beyond their ends. Aciculum single, stout, pale yellow, gently curved, with simple bluntly pointed tip. Sets (Pl. XVI, fig. 21) colorless, numerous (about 30, equally divided between supra- and subacicular groups on middle segments), in a broad, fan-shaped fascicle. Shafts slender, slightly curved, slightly enlarged at the end; the very asymmetrical socket prolonged on one side into a great spine with a few small teeth on its base; the other side bearing a shoulder for articulation of the append- age which is supported by a thin, scale-like process slightly fimbriated at the end. Appendages long, about equal to the depth of the neuro- podia, slender and delicate with the margin very finely but distinctly denticulated. The form of the articulation resembles the EHteone type. Color generally, including prostomium and four anterior segments, under parts, parapodia, lateral parts of notocirri and posterior fourth of body, pale yellowish or yellowish ashy; exposed part of dorsum rich purplish-red with a fine blue-green iridescence. Inner thirds of notocirri rich brown, together forming a pair of broad stripes extending continuously for the anterior three-fourths and becoming darker anter- iorly. Tentacular cirri except colorless tips, largely of a somewhat darker brown. Eyes dark brown. Proboscis unknown. The type is a female containing half-grown ova which largely fill the ecelom and enter the cavities of the parapodia and notocirrophores. 342 PROCEEDINGS OF THE ACADEMY OF [June, Station 4,548, Monterey Bay, June 7, 46 fathoms, coarse sand, shells and rock, Eumida tubiformis sp. nov. Pl. XVI, figs. 22, 23. All of the specimens are contracted and in this state are depressed and stout, with the segments much crowded, particularly at the anterior end. The type, a female with 137 segments, is 67 mm. long, with a maximum body width of 3.1 mm. and a width between tips of parapodia of 4.5 mm. Halosydna insignis Baird. Halosydna insignis Baird, Journ, Linn. Soc. London, VII (Zool.), 1865, p. 188. Polynoé brevisetosa (Kinberg), Johnson, Proc. Cal. Acad. Sei., Ser 3., Zoology, I (1897), p. 167. Figs. 24, 31, 40 and 46. This very remarkable species is well represented in the collection by both the commensal and the free-living phases. Were it not that Johnson’s familiarity with the species in its native surroundings enabled him to demonstrate their identity workers on preserved material alone would almost certainly have separated them as distinct species, though close inspection shows that they agree in their strictly technical characters. Though there are no accompanying notes specifying their hosts or associates it is evident that most of the examples were commensals, they having the elongated form and other characteristics of this phase. The specimens measure from 15 to 45 mm. long, the smallest, while intermediate in proportions, approximating the short stout form of the free-living rather than the slender, elongated form of the commensal phase. As is the case with the former the elytra are strongly imbricated and cover the middle of the back nearly or quite completely. Both phases exhibit color variations through various shades of gray and brown or dusky and the elytra, while usually mottled, may be quite plain and uniformly colored. The pigment may be arranged in dis- tinct spots or assume a reticular pattern around paler areas as in H. californica Johnson. *Most constant is a white spot over the pedicel of attachment and a black or deep brown spot mediad of or behind it. Some specimens with elytra otherwise completely pig- 330 PROCEEDINGS OF THE ACADEMY OF [April, mentless have the anterior ones thus marked. Rarely this assumes the character of a distinct ocellus as in Lepidasthenia gigas (Johnson). The tuberculation of the elytra also varies, the larger smooth papille, which are scattered among the numerous small corneous prickles, being elevated and conical or low and rounded, sometimes con- fined to the first pair of elytra, sometimes present on all or nearly all. Marginal cilia may be confined to the anterior elytra of commensal specimens but are longer and present on all elytra of free-living indi- viduals, which also possess a tuft of five or six long ones just behind the middle of the anterior border. The end of the notocirri may be abruptly contracted as in Johnson’s figure, or taper gently into the terminal filament and this condition occurs independently of commensal or free existence. Notopodial setal tufts are usually longer than indicated in Johnson’s figure and some of the dorsalmost neuropodial sete bear an obscure accessory tooth or spur, and on commensal individuals the dorsalmost pair of neuropodials may be much enlarged. Free-living examples of this species have much the general aspect of Lepidonotus sublews Verrill and L. clava (Montagu). but of course are readily separated by having eighteen instead of twelve pairs of elytra and by other generic characters. Their neuropodial sete differ from those ef commensals in being more slender and less strongly hooked at the end and in having fewer (about 7) pectinated frills. Besides being larger the elytra are also tougher and more horny and the marginal cilia are longer. The distribution of the examples in this collection suggests that other conditions than commensalism may be effective in differentiating the two forms. The proboscis appears to differ in no way in the two phases, in examples of both of which it is protruded. On a specimen 15 mm. long it has a length of 2.6 mm. and a terminal width of 1.6 mm.; one 40 mm. long has these measurements 5.5 and 3.2 mm. respectively, the base being terete, the distal end depressed, with apertural papille ¢. Jaws massive and deep brown, the fangs very stout, compressed, the ventral biting to the right; cutting plates well developed. Ehlers,’ taking a comprehensive view of this and related nominal species, unites, under the prior name of H. patagonica Kinberg, H. brevisetosa Kinberg, Polynoé chilensis Quatrefages, Lepidonotus insignis Baird, Lepidonotus grubei Baird and, with some doubt, Halosydna parva Winberg. His conclusion is partly based upon the > — = — * Festsch, Feier d. 150-jihr. Bestehens d. Kénigl. Gesell. d. Wissensch. 2. Gottingen, 1901, pp. 45-47. 1910.] ‘ NATURAL SCIENCES OF PHILADELPHIA. dol examination of specimens from the Californian coast sent to him by Dr. Johnson. Considered in this wide sense the species ranges along the entire Pacific coast of America from the Straits of Magellan to Stephens Passage, Alaska. Stations 4,421, southeast of San Nicolas Island, 291-298 fathoms, gray mud and rocks (elongated form); 4,453, off Pomt Pinos Light, Monterey Bay, 49 fathoms, dark green mud (short form); 4,457, same locality, 40-46 fathoms, dark green mud (short form); 4,464, same locality, 36-51 fathoms, soft dark gray mud (short form); 4,496, off Santa Cruz Light, Monterey Bay, 10 fathoms, fine gray sand and rocks (20 specimens of the elongated form). ee (| Dar RM /_--Halosydna californica (J OReoay, Polynoé californica Johnson, Proc. Bos. Soc. Nat. Hist., XXIX (1901), p. 387. Specimens of this handsome species from 12-30 mm. long occur in the collection. The elytra present considerable color variation: Some are pale brown with the characteristic reticular pattern; others have them of a nearly uniform reddish brown, with a white spot, accentuated by a small deep brown spot, over the point of attachment ; on one of the latter the first three pairs are translucent mottled grayish. Two of the smallest and the largest one have the elytra pale uniform gray with colorless lateral margins and no mottling and the white attachment spots on those of the last two pairs only. The two stations at which examples were taken yielded H. insignis also. No notes on commensalism are furnished but the specimens from Station 4,421 were entangled with terrebelid tentacular filaments. Stations 4,421, southeast of San Nicolas Island, 291-298 fathoms, gray mud and rocks; 4,496, off Santa Cruz Light, Monterey Bay, 10 fathoms, fine gray sand and rocks. » Halosydna interrupta v. Marenzeller. Halosydna interrupta v. Marenzeller, Denksch. d. kais. Akad. d. Wissensch. Wien, Math.-Nat. Cl., LX XII (1902), p. 570, Taf. I, fig. 2. Polynoé semierma Moore, Proc. Acad. Nat. Sci. Phila. (1903), pp. 402, 403, Pl. XXIII, figs. 2 and 3. The occurrence of a well-preserved and apparently complete example (though in three pieces) of this species in the collection permits of the determination of the above synonymy and the correction of both original descriptions, which were based upon incomplete and poorly preserved specimens. The prostomium of the type of P. semierma is badly macerated and the description based upon it quite incorrect and misleading. The following description of the present example is therefore supplied. 332 PROCEEDINGS OF THE ACADEMY OF [April, Prostomium small, nearly as long as broad, depressed, with a median dorsal furrow dividing it for the entire length mto two smooth, convex lobes that taper at the anterior end gently into the bases of the slender tentacular ceratophores. No peaks and no prominent ocular lobes. Eyes two pairs, very small; the posterior strictly dorsal near caudal border; the anterior lateral on widest convexity of prostomium. Median ceratophore arising from cephalic sinus, slender, about one-half of its length extending beyond lateral ceratophore. Median tentacu- lar style about five and one-half times length of prostomium, slender, tapered, smooth, with a moderate subterminal enlargement and a very delicate terminal filament about as long as the prostomium. Lateral tentacles arising from the frontal prolongation or ceratophores ; styles slightly more than one-half as long as the median style, very slender, without evident subterminal enlargements and the terminal filaments relatively longer than those of the median tentacle. The single palp remaining is moderately stout at the base, about five times as long as the prostomium, strongly annulated and tapered to a very short terminal filament. Peristomial. parapodia apparently quite achetous. Tentacular cirri like median tentacle and about three-fourths as long, the ventral slightly shorter. Notocirri alternately longer and shorter; the longer styles frequently having a line of fracture or articulation near the middle which gives the appearance of a greatly elongated cirro- phore. Posteriorly the longer cirri follow immediately the elytra and are succeeded by shorter ones. The neurocirrus of somite III of one side is duplicated. The specimen is 55 mm. long and has 107 segments. The elytra are small, leaving the entire middle of the back uncovered, and there are thirty-six pairs the first fifteen arranged as in Harmothoé to somite XXXII, the sixteenth on XXXIV and the remaining ones on every third following segment. Von Marenzeller’s specimen, which was dredged at a depth of 480 m. off Eno-sima, Japan, consisted of two pieces. The anterior of nineteen segments bore ten pairs of elytra arranged like their homologues in Harmothoé, etc. The posterior piece consisted of twenty-seven segments terminated by a pygidium and bearing seven pairs of elytra on the third, sixth, eighth and every third segment’ following. Marenzeller considers that somites XX to XXIII along with two pairs of elytra on XXI and XXIII have been lost and that the first three pairs of elytra on the posterior piece are borne, therefore, on XXVI, XXIX and XXXI._ This placing of the elytra is the only discrepancy existing between his description and -“ 1910.] _, NATURAL SCIENCES OF PHILADELPHIA. 333 the present specimen, which agrees fully in this respect with the type of P. semierma. If v. Marenzeller’s example, however, lacks the seven segments (XX-XXVI) and the three pairs of elytra borne on XXI, XXIII and XXVI the elytra on the posterior piece would fall on somites XXIX, XXXII, XXXIV, XXXVI, ete. and the agreement would be complete. This specimen is well colored, each segment being marked on the dorsum with a rather bold, transverse dull purplish-brown bar and the elytra are slightly mottled with brown. Station 4,339, off Point Loma Light, vicinity of San Diego, 241-369 fathoms, green mud. . —~ Lepidonotus celoris Moore. Lepidonotus celoris Moore, Proc. Acad. Nat. Sci. Phila., 1903, pp. 412-414, Pl. XXIII, fig. 12. This species, originally discovered off Japan and later found to be widely and plentifully distributed from Vancouver to the Kadiak Islands, is now determined to be equally common in the region covered by these explorations, from which it was previously known through a single small example dredged at Monterey Bay. The bathymetrical range shown by these explorations is from 26 to 1,400 fathoms. These specimens range in size from 8 to 35 mm. and present all of the color varieties of yellow, orange, reddish, olive brown, dark brown, dusky and nearly black, the brighter colors being sometimes confined to the papille, sometimes overspreading the entire elytra. The elytral tubercles show a distinct tendency to become larger than on northern examples and at the same time lower, flatter and smoother, especially on middle scales. At the ends of the body they are fre- quently conical. Several specimens have the proboscis extended. On one 25 mm. long it is 5.3 mm. long and 3 mm. wide, cylindroid, somewhat depressed at distal end and bearing the usual nine dorsal and nine ventral blunt papille. Jaws deep brown; the fangs rather stout and blunt, cutting edge rather long, knife-like. Stations 4,310, Point Loma Light, San Diego, 71-75 fathoms, green mud and sand; 4,326, off Point La Jolla, vicinity of San Diego, 243- 280 fathoms, soft green mud; 4,411, off Long Point, Santa Catalina Island, 143-245 fathoms, gray sand and shells; 4,417, off Santa Barbara Island, 29 fathoms, fine yellow sand and coralline rock; 4,420, off San Nicolas Island 32-33 fathoms, fine gray sand; 4,421, same locality, 229-291 fathoms, gray mud and rocks; 4,423, same locality, 216-339 fathoms, gray sand, black pebbles and shells; 4,427, off Santa Cruz - 304 PROCEEDINGS OF THE ACADEMY OF [April, Island, 447-510 fathoms, black mud and rocks; 4,430, off Gull Island, Santa Cruz Island, 197-281 fathoms, black sand, pebbles and rocks; 4.431, off Santa Rosa Island, 38-40 fathoms, mud, sand and rock; 4,461, Monterey Bay, off Point Pinos Light, 285-357 fathoms, green mud; 4,515, same, 368-495 fathoms, green mud, sand and shells; 4,531, same, 26-28 fathoms, fine gray sand, pebbles and rock; 4,550, same, 50-57 fathoms, green mud and rock; 4,574, off Cape Colnett, Lower California, 1,400 fathoms. Especially plentiful at stations 4,420, 4,421, 4,480, 4,431 and 4,461, most of the other stations yielding only one or two specimens. Lepidonotus sp. ? A nearly perfect Lepidonotus 12 mm. long was at first referred to L. carinulatus Grube, a species that has been recorded from the Red Sea and the Philippine Islands by Grube, from Japan by v. Marenzeller and more recently from Ceylon by Willey. There exists a close resemblance, especially in the character of the elytra between this specimen and Grube’s description but serious discrepancies arise with Marenzeller’s and even more with Willey’s descriptions. The neuro- podial setee are of the typical Lepidonotus type with no trace of a true subapical spur, but the last pair of toothed plates is greatly de- veloped and superficially somewhat resembles a spur, the remaining ones being reduced in number and much reduced in size or even obsolete. On the whole they resemble the corresponding sets of L. celoris but are more slender. On most of the elytra the horny bosses take the form of subeircular bases rising into more or less compressed keels, many of which are more or less irregular and spinous but which as a rule are smooth and lack the sculpturing so evident on typical L. celoris. Anterior elytra, however, show traces of this sculpturing on the more conical papille. The marginal fringe is very long and extensive. The prostomium has the typical Lepidonotus form quite unlike Willey’s figure of L. carinu- latus. ‘Their color is pale brown with a lght spot over the point of attachment. On the whole it seems best to consider this specimen provisionally as a variation of L. celoris. Station 4,496, off Santa Cruz Light, Monterey Bay, 10 fathoms, fine gray sand and rocks. Eunoé barbata sp. nov. Pl. XXVIII, figs. 1-6. Form moderately robust, dorso-ventral depth nearly equal to width of body in-anterior half but the posterior tapering region much more 1910.] “ NATURAL SCIENCES OF PHILADELPHIA. 335 depressed. Segments 39. Type 29 mm. long; maximum width at XII: body alone, 4.5 mm.; between tips of parapodia, 8 mm.; between tips of sete, 10 mm. Prostomium very small, its width less than one-fifth width of body, broader than long; dorsal furrow shallow and short, the cephalic lobes not well differentiated from each other or from the median ceratophore. Peaks very short and blunt, inconspicuous, but diverg- ing from the median tentacle, well above and largely free from the lateral tentacles. Eyes two pairs, black, conspicuous, the diameter of each about one-eighth width of prostomium; the posterior pair dorsal and near the postero-lateral border; the anterior pair ventro- lateral, anterior to middle of prostomium. Median tentacle with short, stout ceratophore half as thick and one-third as long as prosto- mial width; styles lost from both type and cotype. Lateral tentacles with ceratophores one-half length and one-fourth diameter of median ; styles nearly twice length of prostomium, the basal half nearly uniform in diameter, followed by a slight enlargement bearing the abruptly filamentous terminal third, sensory cilia few and scattered, short, with slightly bulbous tips. Palps slender, terete or slightly five- angled with prominent longitudinal lines of densely placed cylindrical cia, regularly tapered, about five to five and one-half times as long as the prostomium. Facial ridge low but, owing to its dark brown eolor on a white background, very conspicuous. Peristomium represented dorsally by a small nuchal fold, ventrally produced forward and united with prostomium. Its parapodia bear from one to three small curved sete. Cirrophores of tentacular cirri prominent, reaching beyond anterior border of prostomium; styles rather stout, subequal, the dorsal reaching to end of third quarter of palps, the ventral slightly shorter, gently tapered to a fusiform sub- terminal enlargement which passes abruptly into a terminal filament less than one-fifth the total length; sensory cilia scattered, short with thickened ends. Mouth with the usual swollen, rugose lips, the lateral pair embracing the facial ridge anteriorly. Metastomial segments strongly arched anteriorly, posteriorly depressed and tapering to the minute pygidium which (on the type) bears a single cirrus resembling the tentacular cirri but little more than half as long and entirely pale. Neural groove broad and well defined. Nephridial papille begin on VI at postero-lateral border of segments, short and directed slightly upward into the furrows. Typical parapodia rather short, less than one-half width of segments, stout, little compressed, interramal cleft little developed, the notopo- 336 PROCEEDINGS OF THE ACADEMY OF [April, dium overlapping neuropodium from behind. Notopodium much smaller than neuropodium but reaching nearly as far distad, ovate, compressed, oblique, divided by the setigerous cleft and bearing near the ventral border a prominent, conical acicular tubercle. Neuro- podium compressed, the base somewhat narrowed and distal part expanded and tapering to a right-angular apex near the dorsal border, from which the tapered truncate acicular process projects and bears on the dorsal side of its distal end a blunt, finger-like cirrus equal to its own length. On posterior segments the two rami become more nearly equal, the notopodium more slender and projecting and the interramal sinus wider. Notocirrophores prominent, cylindroid with tumid base, suberect and curved, arising postero-dorsad to notopodia; styles similar to tentacular cirri, mostly curved postero-medially over dorsum, on middle segments reaching the length of their terminal filaments beyond median line and nearly unchanged in length posteriorly. On all parts except the terminal filament they bear numerous cilia of varied lengths, many of those on the basal half having a length of twice the diameter of the style. Neurocirri arise much proximad of the middle of ventral face of neuropodium, are smooth, subulate, slender and reach nearly to the base of the acicular process of neuro- podium. Neurocirrus of II about two and one-half times length of others and terminated abruptly in a filament. Aciculum single in each ramus, stout, tapered, yellow, the blunt end projecting for a considerable distance beyond the acicular process. Sete all pale yellow. Notopodials arranged in ashort compact tuft pro- jecting much dorsad but spreading only slightly. They (Pl. XXVIII, figs. 2 and 3) are about as stout as the neuropodials, the distal half bearing numerous, rather distinct and extensive combs; their ends blunt and free of the transverse pectinated processes for only a short distance, some nearly or quite smooth but many bearing a greater or less number (figs. 2 and 3) of appressed scale-like teeth and a few with brush-like ends like those of EF. truncata. The few peristomial sete are like the shorter, curved notopodials. Neuropodial sets (fig. 1) in about three supra-acicular and six subacicular series, gently curved, with enlarged ends bearing from eleven, on the short sete of the ventral row, to twenty, on those of the dorsal row, transverse pectin on each side which become conspicuous in size and distinctly alternate in position only toward the distal end; smooth tips long, two to three times greatest diameter of the sete, stout, strongly hooked and without trace of an accessory process. Caudally the setee become much more slender but are otherwise unmodified. 1910.] NATURAL SCIENCES OF PHILADELPHIA, 337 Elytraphores 15 pairs, on II, IV, V, VI, to XXIII, XXVI, XXIX, XXXII. They are rather small and only moderately prominent with oval or slightly auricular sears from which the elytra are very easily detached. Alternating with them but more mesad in position are small and simple rounded dorsal tubercles. Elytra (Pl. XXVIII, fig. 4) of moderate size and rather thick, soft, texture. Except for a few posterior segments they nearly or quite cover the dorsum. ‘Those of the first pair are small and irregularly circular, the second and third pairs narrow and strongly reniform or bean-shaped; remaining ones so far as known rather broadly ovate-elliptical with the broader end lateral and the anterior border slightly concave or nearly straight. The small sear lies well anterior and slightly lateral to the middle. Except for a small translucent portion of the antero-medial border the surface is thickly covered with hard tubercles, very small and numerous at the antero-medial margin (figs. 4 and 5) but becoming larger and fewer toward the postero-lateral margin (figs. 4 and 6). With the exception of the very smallest these tubercles are knoblike and bear on the summit two, three or more stout, sharp points; some of them are very thickly studded with spines which vary in length on different elytra. A variable number of tubercles near the posterior border and in the neighborhood of the scar are much more massive than the others; these likewise are studded with spines, long or short according to the habit of the particular elytron; many of them are surrounded by a raised ring. Marginal fringe extensive, passing round nearly the entire exposed margin, the cilia slightly knobbed distally and varying much in length, those on the posterior border short and inconspicuous, those of the lateral border exceeding the length of the largest papillae. Scattered over the exposed surface among the spines are numerous short cilia and slightly behind the middle of the posterior border is a loose irregular tuft of cilia, some of which are even longer than the longest lateral cilia. On the first pair large rough tubercles are scattered round the entire margin and the cilia have an even more extensive distribution but are much shorter. Color of middle portion of dorsum brown or olive; parapodia and under parts chiefly colorless. Prostomium purple; eyes black; ten- tacular elytrophores brown, the lateral very dark; styles of cephalic tentacles, tentacular cirri and notocirri of setigerous segments beauti- fully mottled brown and white with the white tip preceded by a brown and this again by a white annulus at the beginning of the subterminal enlargement. Facial ridge brown, palps and notocirri colorless. Elytra, except for the translucent colorless portion, beautifully mot- tled with brown, gray and white, the papille brown or yellow. 338 PROCEEDINGS OF THE ACADEMY OF [April, A single specimen of this species (cotype) occurs in the collection from Station 4,496. The type is No. 2,028 of the collection of this Academy and is referred to on p. 335 of the ProcnEpiNGs for 1908 under the name of Harmothoé hirsuta Johnson as coming from Station 4,205 in Puget Sound. My belief at that time was that H. hirsuta lost the areolation of the elytra and the accessory tooth of the tips of the neuropodial sete with age but additional material has convinced me that this is not the case. This species, though related to H. hirsuta, differs in the form of both notopodial and neuropodial sete and in the absence of elytral areas. Station 4,496, Monterey Bay, off Santa Cruz Light, 10 fathoms, fine gray mud and sand. Eunoé ceca sp. nov. Pl. XXVIII, figs.7-12. A species having the general aspect of Polynoé pulchra Johnson, of similar commensalistic habits, but somewhat stouter. The body is rather thick dorso-ventrally and the parapodia slope upward, forming a shallow, open trough above, a peculiarity that at once distinguishes this species from the last. The type is 40 mm. long, the maximum width at about X being, body—6 mm., between tips of parapodia 11 mm., between tips of sete—l4mm. Number of segments 43. Two of the cotypes are of equal size, the third about one-fourth smaller. Prostomium (Pl. XXVIII, fig. 7) squarish, the posterior border alone strongly rounded, slightly wider than long, posterior half of lateral border somewhat bulging and convex, sides anterior to this gently convergent to the prominent antero-lateral angles or peaks; anterior borders nearly straight with a very shallow median emargination; no dorsal furrow and no eyes. Ceratophore of median tentacle at level of dorsal surface of prostomium and separated from it by a very slight transverse groove, barrel-shaped, about one-half length of prostomium and, owing to slight development of anterior fissure, standing freely and prominently forward. Style (fig. 7) about three and one-half times length of prostomium, slender, regularly tapered, with filamentous tip and no subterminal enlargement; sensory papille almost entirely wanting, only a very few small ones being present. Lateral tentacles arising at a low level on antero-ventral face of prostomium from cylindrical ceratophores which are nearly as long as, but much more slender than, the median ceratophore and which lie well mediad of the cephalic peaks; styles about one and one-third to one and one-half times length of prostomium, very slender, sub- ulate, with long filamentous tips. Palpi also very long, slender and 1910.] NATURAL SCIENCES OF PHILADELPHIA. 339 perfectly smooth, four to four and one-half times length of prostomium ; sensory papille not obvious. Facial tubercle unusually large, elevated on facial ridge. Mouth large with prominent, pouting, trifid, furrowed lips, the facial ridge passing between the anterior pair. Peristomium obvious only through its parapodia which project well forward beyond the cephalic peaks and bear on the medial side a prominent tubercle from which projects the end of a stout brown aciculum and below this a pair of stout notopodial sete; beyond this the cirrophores separate. Styles of tentacular cirri similar to median tentacle which the dorsal slightly exceeds, the ventral slightly shorter. Metastomial segments indistinctly separated by faint furrows, the whole ventral surface forming a somewhat prominent sole-like struc- ture, with the neural furrow and lateral ridges only moderately well- marked. Nephridial papilla begin of VI; small, flattened, inconspicuous and projecting upward between the bases of the parapodia. Owing to the peculiar elevation of the parapodia the dorsum of the body appears to be depressed and gives the effect of a furrow. Elytro- phores occur on II, IV, V, VII, IX, XI, XIII, XV, XVIT, XTX, XXI, XXII, XXVI, XXIX and XXXII = 15 pairs; they lie well out on the bases of the parapodia, are low and wide and often constricted below the nearly circular free surface. Dorsal tubercles are subconical promi- nences occurring at the same level as the elytrophores but projecting beyond them slightly lateral. The greatest width is at about somite X, anterior to which the sides curve broadly into the oral region and behind which they taper regularly to the pygidium, which is a minute, short, tubular segment with dorsal anus, below which is a common cirrophore bearing the two very slender anal cirri exceeding in length the greatest width of the body without parapodia. Parapodia rather short, on anterior and middle segments scarcely more than one-half width of segments bearing them. As indicated above they slope dorsad from the ventral surface rather strongly. They are compressed and at the base rather deep, the rami only slightly separated (Pl. XXVIII, fig. 8). Notopodium very short and thick, the moderately elongated, conical acicular process obliquely truncated at the end, projecting from its ventral margin and reaching to or slightly beyond the end of the neuropodial acicular process. Neuro- podium compressed, tapered to a blunt point and extended beyond the notopodium by a foliaceous margin or presetal lobe including in its dorsal part the rather obscure acicular process, which is broad and flat, nearly as long as the notopodial acicular process and bears at its 340 PROCEEDINGS OF THE ACADEMY OF [April, end ashort, blunt flat cirrus. Parapodium II scarcely differs from the others. Notocirrophores arising almost directly behind notopodia, prominent, suberect, reaching level of neuropodial acicular process, cylindroid with somewhat tumid base. Styles (fig. 8) long and slender, reaching to middle of dorsum and far beyond sete tips, like medium tentacle in all respects. Those at the caudal end much elongated and slender. Acicula single, deep brown, very stout, tapered to acute, pale tips which project slightly beyond the acicular processes in both rami. Neuropodial sete (Pl. XX VILL, figs. 9 and 10) reduced in number, usually two supra-acicular and six subacicular series of two to four each on middle segments. All stout, deep yellow, prominent, with the thick- ened terminal portion strong and long (generally about two-fifths of exposed length); transverse pectinations numerous and close but exceedingly fine and on many sets quite obsolete, apparently as the result of wear; smooth tip rather long (2-3 times diameter of seta) stout, curved and lacking an accessory tooth (fig. 10). Notopodial sete also comparatively few, forming an irregular loose bundle, deep yellow, about as stout as the neuropodials but much shorter, nearly straight, tapered to blunt, smocth tips and with the transverse rows of spines nearly or quite obsolete (figs. 11 and 12). Both kinds of setze resemble those figured by MeIntosh for Polynoé enplectelle but are stouter. Elytra attached with moderate firmness, of delicate gelatinoid consistency and in their evidently much contracted state shrunken away from the middle line and having a deep central depression and more or less folded and frilled raised margins. Probably they are in life flat and overlap widely. So far as can be determined the first is circular, the others more or less broadly reniform. They are color- less, translucent and totally without marginal cilia or obvious tubercles on the smooth dorsal surface. Under the microscope an area of rather closely placed minute horny tubercles appears behind the hilum and similar tubercles are scattered widely over the entire surface. Except for a slight purplish brown color of the head the entire worm is colorless. Station 4,537, Monterey Bay, off Point Pinos Light, 861-1,062 fathoms, hard sand and mud. Commensal on Holothuria sp. (four specimens). Harmothoé (Lagisca) multisetosa Moore. Lagisca multisetosa Moore, Proc. Acad. Nat. Sci. Phila., 1902; pp. 267-269, Pl. XIV, figs. 29-36. The specimens in the collection referred to under this and the \.2 1910.] ‘ NATURAL SCIENCES OF PHILADELPHIA. 341 following two names form a puzzling group the status of which was decided upon only after much hesitation. This arose chiefly from the imperfect preservation of the specimens and the absence of attached elytra, but also because of the similarity and variability of the species. All three species have the caudal end of the body slender and tapered and prolonged considerably beyond the last elytra. The cephalic peaks vary greatly, being sometimes much more prominent and acute than is usual in the genus. sometimes short and round, but it is probable that these variations arose as the result of conditions of preservation. No attached elytra were found but two or three loose ones differ from those typical of this species in no way except in the slight development of soft papille. A bottle from station 4,405 containing some examples of this and the next species yielded three kinds of loose elytra: those typical of the two species and another form lacking large soft papillee and covered thickly with long slender acute spines, resembling very closely, therefore, the elytra of Lagisca crosetensis McIntosh. A study of all the material at my disposal brings to light an unbroken series between this form and those with large soft papillee and small spines. The sete figured by McIntosh differ considerably from those of L. multisetosa which have the pectinated plates of the neuropodials continued almost to the tip. It seems not improbable, however, that a fuller knowledge of the Lagisce of the Pacific will demonstrate a multiplicity of variable and intergrading forms. Stations 4,405, off San Clemente Island, 654-704 fathoms, green mud; 4,427, off Santa Cruz Island, 447-510 fathoms, black mud and rocks; 4,453, Monterey Bay, off Point Pinos Light, 49-51 fathoms, green mud; 4,517, same, 750-766 fathoms, green mud and sand; 4,574, off Cape Colnett, Lower California, 1,400 fathoms. Harmothoé (Lagisca) lamellifera v. Marenzeller. Polynoé (Lenilla) lamellifera v. ‘Marenzeller, Denkschr. kénigl. Akad Wiss. Wien, XLI, Math.-Nat. Cl., 2d. Abth. (1879), pp. 115-117, Taf. I, ee multisetosa papillata Moore, Proc. Acad. Nat. Sci. Phila., 1908 p. 335. Most of the specimens here referred to this species agree closely with v. Marenzeller’s description and figures but others have setze and elytra that vary somewhat in the direction of both the preceding and following species, from typical examples of both of which these are distinguished by the much reduced cephalic peaks, the sparseness of the marginal fringe of cilia on the elytra, the very short blunt tips of the notopodial setze and the very slender and elongated neuropodial ° 342 PROCEEDINGS OF THE ACADEMY OF [April, setze with their remarkably rich pectination consisting of forty or more pairs of combs reaching nearly to the tip. Marenzeller’s figure of the prostomium is undoubtedly drawn from a specimen in which the peaks were retracted and bent dorsad so that they fail to be represented in the figure. All of my specimens possess minute but quite evident peaks. If my interpretation be correct the ventral lamella referred to by v. Marenzeller is an integumental fold close to the nephridial papillee and under certain conditions of preservation appears in many species. It is therefore not diagnostic and occurs in some of these specimens and is absent from others. Typical elytra quite like v. Marenzeller’s figure were found in bottles containing specimens of this species from stations 4,339, 4,405, 4,425 and 4,428. The margin bears but a few short cilia and the outer surface is thickly studded with small, truncate horny spines among which are scattered, posterior to the attachment and more or less arranged in oblique rows, the larger soft papille. These are generally brown in color and of low, rounded, somewhat recumbent form and appear to be hollow. Usually they are small and quite numerous. Others have the papille near the posterior border much more enlarged and several from stations 4,339 and 4,405 have few small soft papille but much larger mammilliform or sugar-loaf-shaped submarginal papille exactly like those of the types of L. multisetosa papillata. In one case these papillee number only four or five, clavate and connate with the surface of the scale except at the tips, and in the case of two elytra from station 4,405, which appear to be the first pair, the papille are’ large, decumbent cones. The setze agree closely with v. Marenzeller’s figures but the accessory tooth of the tip of the neuropodials is present more commonly than he indicates and the pectinated plates reach nearer to the tip. The rows of spines of the notopodials always reach nearly to the blunt tip which is frequently roughened but the extent of the tip thus exposed varies somewhat. While most of the specimens are small and much broken some of those from station 4,405, although completely denuded of appendages, have all sezments present. One of the largest of these has forty-three segments, the fifteenth pair of elytrophores occurring on XXXII, and measures 55 mm. by 15 mm. between sete tips. Marenzeller gives only thirty-six segments. The color above is a pale or medium brown with two narrow, white lines across each segment, the venter gray; elytra more or less suffused with brown on the medial half. Several of the specimens are filled with eggs. 1910.] “ NATURAL SCIENCES OF PHILADELPHIA. 343 Stations 4,305, off Point Loma Light, near San Diego, 67-116 fathoms, gray sand and shells; 4,310, same, 71-75 fathoms, green mud and fine sand; 4,339, same, 241-369 fathoms, green mud; 4,389, off Point Loma Lighthouse, 639-671 fathoms, green mud, gray sand; 4,405, off San Clemente Island, 654-704 fathoms, green mud; 4,425, off San Nicolas Island, 1,100 fathoms, green Globergerina mud and fine sand; 4,428, off Santa Cruz Island, 764-891 fathoms, green mud. Harmothoé (Lagisca) yokohamiensis McIntosh. Lagisca yokohamiensis McIntosh, Challenger Reports, Zoology, Vol. XII, pp. 89, 90, Pl. XIA, figs. 12 and 13. This species lacks the large soft papille that adorn the elytra of the two preceding. The horny papille are small, conical or truncate and are uniformly distributed over the entire exposed portion of the elytra. Marginal cilia are moderately long and have slightly bulbous tips and a few longer cilia are borne on the surface near the posterior margin. Notopodial sete are rather stout, the largest about three times the diameter of the neuropodials and their smooth tips (Pl. XX XI, fig. B) are much longer than in the preceding species, the rows of spines very numerous and the longest nearly encircling the seta. The extent to which they bend over the dorsum and protect the elytra is noteworthy and ealls to mind the condition in Gattyana. Neuropodials (PI. XX XT, fig. A) also have much longer tips and only twenty to thirty pairs of pectinated plates and the rather prominent accessory tooth is present on all but the ventralmost rows. Notocirri are long and very slender with the subterminal enlargement scarcely visible and the terminal filament unusually long and bear a moderate number of clavate cilia much longer than those on the tentacles. Several have the proboscis protruded. In one 28 mm. long it is 4.6 mm. long and 2.5 mm. at the orifice. It is clavate, the distal end nearly circular, the mouth rather small and lozenge-shaped; orifical papille nine above and nine below. Jaws pale brown, the fangs compressed, prominently outstanding like a parrot’s beak and the knife-like cutting plates directed more antero-posteriorly than trans- versely. Complete examples have from forty-four to forty-six seg- ments. Color above dark or usually pale brown with or without narrow transverse white lines, below nearly colorless. Elytra colorless or the posterior part marked with brown usually in three large blotches. Ova oecur in only one specimen from an unknown station. This may be the Hawaiian species referred to H. haliaeta McIntosh by Treadwell. These specimens agree very closely with McIntosh’s 344 PROCEEDINGS OF THE ACADEMY OF [Apru, description and figures. The marginal cilia of the elytra might be more correctly described, however, as moderate in size and number rather than long and numerous. McIntosh pointed out that his species is closely related to Polynoé (Lenilla) lamellifera Marenzeller, the only conspicuous difference being the absence of soft elytral papillae. Polynoé subfwmida Grube is another allied species. Stations 4,414, off Santa Catalina Island, 152-162 fathoms, fine gray sand and mud; 4,427, off Santa Cruz Island, 447-510 fathoms, black mud, rocks; 4,430, off south coast of Santa Cruz Island, 197-281 fathoms, black sand, pebbles, rocks; 4,515, Monterey Bay, Point Pinos Light, 368-495 fathoms, green mud, sand, shells; 4,537, same, 1,041—1,062 fathoms, hard sand and mud. Harmothoé scriptoria sp. nov. Pl. XXVIII, figs. 13-17. A pretty, daimty species with delicate, easily detached scales. Moderately slender, slightly depressed, little tapered toward the two ends which are nearly equally rounded. Measurements of type: length 15 mm., width at X, body, 1.6 mm., between tips of parapodia 4 mm., between tips of sete 5.5 mm. Number of segments 39. Type 2 filled with ova. Prostomium (Pl. XXVIII, fig. 13) slightly longer than wide with a distinct longitudinal dorsal median furrow for its entire length, slightly and regularly convex laterally, broadly rounded or subtruncate anteriorly, without distinet peaks and little or not at all overhanging the bases of the lateral tentacles. Eyes, two pairs, black, small; the posterior not more than one-fourteenth width of prostomium, dorso-lateral, separated by two or three times its diameter from posterior border of prostomium; the anterior slightly larger, lateral and slightly ventral, about one-third of length of prostomium from its anterior end. Median ceratophore short and thick, projecting but little from the cephalic sinus; style of median tentacle unknown but its character may be judged by the tantacular cirri. Lateral tentacles small, total length less than prostomium, arising from anterior face of prostomium slightly below median ceratophore, their ceratophores very short; styles regularly subulate. Palps two and one-half or three times as long as prostomium, rather stout and projecting later- ally beyond prostomium at base, tapering gradually to near tip and then rapidly to asharp point; no distinct raised lines or ridges. Facial ridge large, broad and rounded. Peristomial parapodia large and projecting well-foward beyond prostomium, achetous, the tentacular cirrophores well separated; styles moderately slender, regularly tapered, without ‘subterminal 1910.] NATURAL SCIENCES OF PHILADELPHIA, 345 enlargement, terminal filament short or indistinct; the dorsal about four-fifths, the ventral three-fourths length of palpi. Mouth sur- rounded by a furrowed trilobate lip. Remaining segments well marked. Greatest width near anterior end (VII or VIII), thence body regularly but very gently tapered caudad. Neural furrow distinct and deep. Nephridial papille not clearly seen, evidently very small. Dorsum with intersegmental furrows well developed except in pharyngeal region. Dorsal tubercles small and inconspicuous. Pygidium larger than usual in the family; anus dorsal. Anal cirri lost but a pair of small cirri, evidently the last notopodials, at sides of anus. Parapodia (fig. 14) rather prominent, nearly equalling width of body on middle segments. In the type the base somewhat swollen with eggs, thence tapered distad to the pointed apex. Neuropodium large, compressed, tapered to a prominent, acutely triangular, flattened, acicular lobe, beyond which the aciculum appears not to project (fig. 147). Notopodium of typical parapodia reduced to a small antero-dorsal setigerous lobe with a finger-shaped acicular process at its ventral border from the end of which the tip of the small aciculum projects. Notocirrophores small, but rather elevated, situated a little dorsad and caudad of notopodia; styles short, reaching tips of neuropodial sete only, subulate with thickened base tapered to slender, acute point, bearing a very few minute clavate sensory cilia or none. Neurocirri arising far out beyond middle of ventral face of parapodia, not reaching end of neuropodia, slender, regularly subulate, acute. Neurocirrus of II about twice as long as its parapodium, nearly equal to ventral tentacular cirrus. Elytra 15 pairs, having the customary arrangement, small, and little elevated. Elytra (Pl. XXVIII, fig. 15) easily detached, only slightly imbricated and barely covering dorsum. First pair subcireular and completely hiding prostomium, its small scar shehtly caudad of middle ; the next two strongly reniform with a deep hilum close to which is the scar of attachment; succeeding ones larger, broader and less deeply emarginate, with the scar slightly antero-lateral of the center; the last pair, finally, subquadrate-elliptical with the attachment anterior to the center. All are thin, delicate and membranous, perfectly smooth, and entirely lack cilia and tubercles, except for a small area of minute, rounded corneous granules just behind the hilum. They are pale and daintily colored, with a bluish-gray ground and white subcentral spot, a pale brown postero-medial submarginal crescent and a small more deeply colored pigment spot over the point of attach- 346 PROCEEDINGS OF THE ACADEMY OF [April, ment. The first has a complete circle of brown round a white center. Under the microscope the surface shows close and curious fine pencil- like white markings (fig. 15%) usually wavy or crenulated and often bent or branched, having somewhat the appearance of written characters. The branching of the nerves from the scar is also very obvious. Acicular single in each ramus, the notopodial very small and its acute tip projecting freely from the end of the acieular process; neu- ropodial very much stouter, its tip just appearing at the surface ventrad and proximad to the tip of the acicular process. Notopodial sete (Pl. XXVIII, fig. 17) forming a whorl, few, short, not reaching to level of tip of neuropodium, about as stout as neuropodials, colorless or pale yellow, scarcely curved, tapered, blunt-pointed, the distal half marked with numerous, fine, close combs, which become longer distally and reach nearly to the tip. As usual the dorsalmost are stouter, shorter and more curved. Neuropodial sete (Pl. XXVIII, fig. 16) in three supra- and eight subacicular series, colorless, slender and rather long, with the distal enlargement short and strong except on the ventral rows; marked with twelve (dorsalmost) to twenty-two (ventralmost) pairs of pectinated plates which are closely appressed, the longer proximal ones being finely divided, the distal becoming shorter and nearly entire, the last very close to the accessory tooth; smooth tip very short, ending in a short, strongly hooked, claw-lke tooth and an almost equally prominent and strong accessory tooth. On II the neuropodials are much smaller and more slender and nearly like the notopodials. Dorsum olive green, venter gray; prostomium purplish, a dorsc- lateral area overlooking the anterior eyes pale; tentacular cerato- phores brown, the base of the lateral styles also brown; palps and tentacular cirri unpigmented; lips and facial ridge slightly brown or colorless; parapodia uncolored; notocirrostyles with basal half brown, sometimes marked by a white ring, and distal half also white; neuro- cirrostyles brown with white tip and often a white ring or spot above base. Stations 4,452 (type), Monterey Bay, Point Pinos Light, 49-50 fathoms, green mud and fine sand; 4,460, same, 55-167 fathoms, green mud, gravel. Harmothoé triannulata sp. nov. Pl. XXINX, figs. 18-22. A species of neat and trim appearance, more slender than H. imbri- cata, about as depressed as that species and on the whole resembling it. The four known specimens are all small, the largest being 17 mm. long; the tpye is 12 mm. long; maximum width of body 1.4 mm.; 1910.] NATURAL SCIENCES OF PHILADELPHIA, 347 between tips of parapodia 3 mm. and between tips of sete 4.8 mm. Number of segments 39. Prostomium (Pl. XXIX, fig. 18) small, depressed, the frontal slope slight and nearly plain, divided for nearly the entire length by a median dorsal furrow; width slightly exceeding length, greatest in posterior half, anterior to that contracted and narrowed into cephalic peaks, which are prominent, acute and widely divergent and well separated from the median ceratophore; anterior sinus broad and moderately deep (about one-third prostomial length), continued by dorsal furrow nearly to caudal border. Eyes black, conspicuous but not large; the posterior dorsal and touching or nearly touching posterior border of prostomium, their diameter one-eighth or one-ninth of prostomial width; anterior pair on sides of prostomium behind middle, little visible from above, looking laterad and slightly forward, in type but little larger than posterior eyes but on other specimens one-fourth or more larger in diameter. Median ceratophore (Pl. X XIX, fig. 18) arising in frontal sinus, short and stout, its length not exceeding one-third prostomium and width nearly equal, cask-shaped, scarcely reaching beyond peaks. Style rather stout, not more than twice length of prostomium, basal two- thirds subcylindrical with a very slight subterminal enlargement, nearly the distal third coarsely filamentous; sensory cilia numerous, nearly as long as diameter of style, with slightly bulbous tips. Cerato- phores of lateral tentacles short and thick, situated far back so that they are invisible from above, nearly meeting below median tentacle; styles (fig. 18) less than one-half length of median style, subulate, the base somewhat thickened but the distal half very slender and delicate; sensory cilia scattered, much shorter than on median tentacle. Palps (fig. 18) also arising far back, about three to three and one-half times length of prostomium, rather slender, the base less than one-half width of prostomium, gently tapered to near end, then abruptly contracted into a short terminal filament, thickly covered with minute eloboid sensory cilia giving to it a brownish coloration. Facial ridge short and narrow. : Peristomial parapodia (Pl. XXIX, fig. 18) acheetous, the tentacular cirrophores not quite reaching level of cephalic peaks; styles exactly like that of median tentacle except that they are slightly more slender; the dorsal equal to median tentacle, the ventral slightly shorter but with the filament relatively longer. Mouth with the usual full, pouting lips. Body rather deep, the segments well differentiated and of remark- 348 PROCEEDINGS OF THE ACADEMY OF [April, ably uniform width to near the caudal end where they taper rapidly into the minute pygidium. Neural furrow and lateral ridges little marked but the ventral field as a whole prominent and very smooth; the dorsal surface very little cross-furrowed. Nephridial papille begin at VI but are very minute and inconspicuous throughout, often pigmented. Anal cirri similar to notocirri but longer, equal to greatest width of body and parapodia without sete. Elytrophores small and prominently elevated, with constricted pedicle and circular bearing surface; because of their whiteness in a brown background they are very conspicuous; fifteen pairs with the usual arrangement. Parapodia (Pl. XXIX, fig. 19) rather short and small, little com- pressed, their basal depth much less than the depth of the body and their length nowhere exceeding by more than a trifle one-half the width of the segments; posterior parapodia not relatively longer than others. Notopodia little prominent, flattened lobes prolonged into a short, blunt, postsetal, acicular process. Neuropodium much larger but short and abruptly truncated, the nearly square or very broadly rounded postsetal lip merging with the presetal lip at the dorsal margin; the presetal lip prolonged from the dorsal margin into the short, broad, blunt acicular lobe, which bears a minute finger-like cirrus above the projecting end of the aciculum. Notocirrophore (Pl. X XIX, fig. 19) slightly dorso-caudad of notopo- dium, short, reaching not quite to base of notopodial acicular process ; base swollen, the rest cylindrical and rather strongly curved. Style exactly like median tentacle, scarcely reaching tips of longest sets and but little beyond median line, longer near caudal end, rather richly provided with sensory cilia with bulbous ends and nearly as long as diameter of style. Neurocirri (fig. 19) with small cirrophore posterior to ventral border proximad of middle of neuropodium; style very regularly subulate, slender, short, not reaching end of postsetal lip at level of aciculum; no sensory cilia. Neurocirrus of II two-thirds as long as ventral tentacular cirrus. Acicula as usual single, straight, tapering, yellow styles, both projecting freely from the ends of their respective acicular processes. Neuropodial sete in four supra-acicular and seven or eight subacicular series, nearly colorless, rather stout, nearly equaling notopodials in this respect; the shafts straight and distal enlargements (Pl. XXIX, fiz. 21) of moderate length, gently curved and tapered, with from sixteen (ventral) to twenty-two (dorsal) pectinated plates on each side which are deeply and finely divided, becoming prominent and somewhat imbricated toward the distal end, which is smooth for a 1910,] "NATURAL SCIENCES OF PHILADELPHIA. 349 distance of about one and one-half to twice the diameter of the seta and terminates in a slightly curved point and slender appressed acces- sory process, which is absent from the ventral row or two. Notopo- dial sete moderate in number, short, forming an inconspicuous de- pressed whorl, short, very pale yellow, little stouter than neuropodials, gently curved, with numerous, and close (34 to 34 in space of diameter of seta), rather conspicuous (especially on dorsal sete) transverse pectine leaving a rather long, blunt, smooth tip not less than the diameter of the seta (Pl. X XIX, fig. 22). Seta not elongated caudally. Elytra (Pl. XXIX, fig. 20) completely covering dorsum of all but five or six posterior segments, the first nearly circular, the others broadly elliptical with a slight antero-marginal concavity. Scar antero-lateral of center. Except for a very small naked area at the antero-medial margin the entire surface is studded with small horny cones or blunt, rough tubercles which become somewhat larger latero- caudad where the margin bears a sparse fringe of rather short cilia with slightly bulbous ends, a few short ones of the same kind being scattered over the surface back of the border. Along the margin there is also usually one or a few small soft papille like those of H. vmbricata but usually ovate (though in one specimen they are rod- shaped) and scattered over the entire surface posterior to the scar. Colors pale and delicate on these specimens, the dorsum generally colorless or white, the median field quite unspotted anteriorly in the proboscidial region but generally with a more or less evident trans- versely elongated brown spot near the posterior margin of middle and posterior segments. On each side of each segment is a somewhat V-shaped brown spot, the apex of which covers the dorsal tubercles and the anterior face of the elytrophores. On the most pigmented segments two small brown spots may occur at the base of, but not on, the cirrophores. On the exposed caudal segments these several spots tend to merge. Parapodia, elytrophores, notocirrophores, neurocirri, anal cirri and venter uncolored. Prostomium slightly purplish or pink, probably brightly colored in life but not pigmented; eyes black. Styles of median tentacle, tentacular cirri and notocirri white with three pale brown but obvious bands at the base, the proximal and the distal ends of the subterminal enlargement. Lateral tentacles, facial ridge, nephridial papille and lips pale brown; palps uncolored or dusky. Elytra delicately blotched with somewhat irregular, con- fluent pale brown spots on a colorless ground, the median and covered portions and lateral border being free from pigment and the deepest coloration occurring over the point of attachment behind which is a 350 PROCEEDINGS OF THE ACADEMY OF [April, conspicuous small white spot from which the markings somewhat radiate. Proboscis of one specimen (cotype) protruded nearly 3 mm., width 1.7 mm., cylindroid, depressed slightly, orifice with nine dorsal and nine ventral prominent papille. Jaws pale brown, the fangs large and prominent, the ventral biting to right; cutting plates low and curved caudo-laterad. There are four specimens, two from each station and three of them are filled with nearly mature ova and sperm. This species is closely related to H. imbricata but differs obviously in the much more posterior position of the anterior eyes, which are placed more nearly as in H. crassicirrata. Stations 4,420 (cotype), off San Nicolas Island, 238 fathoms, hard black mud; 4,431 (type and cotype), off Santa Rosa Island, 38-41 fathoms, green mud, coarse sand and rocks. Harmothoé sp. ? A small specimen denuded of all cephalic appendages, cirri and elytra. The sete rather closely resemble those of Lagisca elizabetha as figured by McIntosh. It is possible that this may be the species recorded by Treadwell in his paper on Polycheta of Hawaiian waters under the name of Harmothoé halwita. According to Treadwell’s account his specimens differ consideralby from McIntosh’s description. Station 4,463, Monterey Bay, off Point Pinos Light, 48-111 fathoms, rocky. | »Harmothoé hirsuta Johnson. Harmothoé hirsuta Johnson, Proc. Cal. Acad. Sci., 3d Series, Zoology, Vol. I, pp. 182, 183, figs. 27-29, 38 and 53. This species, originally described by Johnson from San Pedro, has since been recorded by Ehlers from the coast of Chile, by Treadwell from the vicinity of San Diego and by the writer from Alaska and Puget Sound. Unfortunately the latter record is partly erroneous owing to an apparently mistaken belief that marked changes take place in the character of the scales and setze during growth. This error is corrected under the heading of Hunoé barbata of which species one of the Puget Sound specimens referred to in 1908 under the name of H. hirsuta is the type. The elytra and sets are quite characteristic and agree closely with Johnson’s figures. Some of the marginal polygonal areas bearing the large papillee may be ill-defined, the spines are often rough, bifid or trifid and the cilia on the posterior are as long as those on the lateral 1910.] NATURAL SCIENCES OF PHILADELPHIA. 301 margin. Frequently the smooth tips of both notopodial and neuro- podial sets are even longer than indicated by Johnson’s figures. The accessory tooth of the latter is best developed on the dorsal rows and frequently absent on the ventralmost two rows. The palpi are slightly angulated by six raised longitudinal lines bearing cilia. One of the most striking superficial characters of this species is the promi- nence of the notopodial sete. Stations 4,420, off San Nicolas Island, 32-33 fathoms, fine gray sand; 4,496, Monterey Bay, off Santa Cruz Light, 10 fathoms, fine gray sand, rocks. * Harmothoé tenebricosa sp. nov. Pl. XXIX, figs. 23-28. A rather broad and strongly depressed species with long, laterally directed parapodia. The type, like one of the two largest specimens, has 41 segments, is 35 mm. long and at somite X has a width of body of 4 mm., between tips of parapodia of 9.5 mm. and between tips of sete of 14 mm. _ Prostomium (Pl. X XIX, fig. 23) about one-fifth wider than long, strongly arched above, sloping forward from the prominent posterior region; greatest width near posterior end, the sides strongly convex; anterior border depressed in middle, with a wide fissure from which a furrow extends for a short distance caudad; at a distance from the fissure equal to its width the blunt peaks rise rather abruptly and project prominently forward freely above the bases of the palps and lateral tentacles. (One specimen has the peaks retracted and little prominent and another (sta. 4,528) has the prostomium less con- tracted anteriorly and more quadrate in form.) Eyes totally wanting. Frontal ridge and tubercle very conspicuous, mouth trilobate, sur- rounded by very prominent protuberant furrowed lips. Ceratophore of median tentacle (fig. 23) arising from frontal fissure, eylindroid, short, projecting only a little way beyond the peaks; style less than three times length of prostomium, moderately slender with a faintly indicated subterminal enlargement and a rather long, slender subterminal filament. Ceratophores of lateral tentacles at level of palps and partly covered by median tentacle, reaching nearly to end of median ceratophore; styles scarcely longer than prostomium the basal half or more tapered, the rest filamentous. Sensory papillie absent or nearly so from all cephalic appendages. Palps slender, regularly tapered, from three to five times length of prostomium according to state of contraction or extension in different specimens ; filamentous tip very short, no longitudinal ridges or lines of sensory cilia. 302 PROCEEDINGS OF THE ACADEMY OF [April, ~ Peristomium not distinct, its parapodia (Pl. XXIX, fig. 23) elongated and reaching beyond cephalic peaks, bearing on its medial face two small sete beyond which the cirrophores diverge slightly; styles of tentacular cirri similar to median tentacle, the dorsal about as long as the latter, the ventral slightly shorter. Metastomial segments depressed, with strongly marked neural furrow and muscular ridges below; segments anterior to XX of nearly uniform width, posterior to that tapering regularly to pygidium which has the usual form but has lost its cirri. Nephridial papillee begin on VI, when fully developed prominent, subconical, with enlarged base and tubular end directed dorsad between bases of the feet. Parapodia (Pl. XXIX, fig. 24) very prominent, fully as long as width of segments bearing them on middle of body and exceeding this caudally, in basal part dorsal and ventral borders nearly parallel; rami well differentiated. Neuropodium compressed and expanded into a large, obliquely-ovate, foliaceous, presetal lobe prolonged slightly into a tongue-shaped process and including in its dorsal border the acicular process and aciculum. Notopodium rather prominent, with a constricted base and compressed free setigerous lobe, its ventral part prolonged into a very long, slender, tapered, blunt-ended acicular process which reaches nearly as far as the neuropodial acicular process and bears no terminal cirrus. The foliaceous lobes are largely devel- oped on middle somites but are reduced toward the ends of the body. Posterior parapodia become more slender and elongated. Notocirrophores (Pl. X XIX, fig. 24) arise almost in contact with the notopodia but slightly caudad and dorsad of them; they are cylindroid with enlarged bases and reach far beyond the notopodial setigerous lobe. Styles slender, elongated, reaching far beyond tips of sete or well beyond dorsal median line, tapered nearly regularly, with very slight subterminal enlargement, to a long filamentous tip; a very few small clavate sensory cilia seattered throughout their length. Neurocirri with short, well-differentiated cirrophores and rather long, regularly tapered styles reaching to the middle of the foliaceous presetal lobes. Acicula single in each ramus, stout and brown at base, tapering to slender, colorless tips which project freely, the notopodial from the end of the acicular process, the neuropodial from behind the tip of the presetal lobe. Notopodial sete (Pl. XXIX, figs. 27, 28) in an irregular, slightly spreading tuft, moderately numerous, pale yellow, rather stout, straight or slightly curved, tapered to blunt points and practically smooth, the pectinations being nearly obsolete. Two Ee > 1910.] "NATURAL SCIENCES OF PHILADELPHIA. 3599 sete of this kind occur on the peristomial parapodium; and on pos- terior parapodia the number is much reduced. Neuropodial sete longer and more slender than in H. ceca and pale yellow or straw-color instead of deep yellow. They are few in number, only from one to three in each series and on middle somites usually only one or two supra-acicular and six (or five) subacicular sete or series of two or - three setee. The shafts are nearly or quite as stout as the notopodial sete and the long distal enlargements (fig. 25) arise gradually and are never strongly developed but are longer than in EF. ceca. They are only slightly curved and taper gently to rather strongly hooked, acute tips (fig. 26) provided with a prominent, slender and acute accessory tooth which becomes progressively smaller on setze of the more ventral rows and is often absent on the ventralmost. Transverse pectinations are equally close and numerous and only slightly more marked than in E. ceca. Elytrophores have the same arrangement as in EF. ceca but are rather smaller and more elevated. They are situated far out on the parapodia. The dorsal tubercles (fig. 24) which alternate with the elytrophores project very prominently and their free ends come nearly into contact with the notocirrohores. Elytra have small areas of attachment and are readily displaced, nearly all of them being loose in the known specimens. They are nearly indistinguishable from those of FE. ceca but are somewhat more membraneous and delicate. They lack marginal cilia and surface tubercles except for a single triangular area of crowded small ones with its base at the hilum and apex at the sear. The branching nerves radiating excentrically from the scar of attachment are particularly large. Entire body pale yellow entirely lacking pigment; all cephalic appendages, cirri and elytra quite colorless. Stations 4,400, north of San Diego, lat. 32°, 50! N., 118°, 031 W., 500-507 fathoms, green mud (type and cotype); 4,528, Monterey Bay, Point Pinos Light, 545-800 fathoms, soft gray mud (cotype). This species resembles H. ceca in general appearance but differs in many respects and especially in the longer and more slender neuro- podial sets with accessory subterminal tooth. It departs in many ways from the more typical species of Harmothoé, especially in the structure of the parapodium. " Harmothot (Evarne) fragilis sp.nov. Pl. XXIX, figs. 29, 30; XXX, figs. 31-33. In general resembling Evarne impar Malmgren, moderately depressed, ereatest width far forward tapering regularly but only slightly caudad. Length of type 19 mm.; maximum width (VII or VIII), 3 mm.; 354 PROCEEDINGS OF THE ACADEMY OF [April, between tips of parapodia about 5 mm., and between tips of sete, 7.2 mm. Number of segments 37. Prostomium (Pl. X XIX, fig. 29) as wide or slightly wider than long, depressed, frontal slope moderate, divided by a median dorsal furrow for most of length, the halves smoothly rounded; postocular region somewhat contracted but concealed by a membraneous nuchal fold; greatest width slightly anterior to middle and occupied by prominent ocular swellings anterior to which is a rather abrupt constriction sloping immediately into the peaks. Cephalic peaks usually rather large and prominent, with steep medial slopes and blunt apices separated from the median ceratophore by an interval not exceeding three- fifths diameter of median sinus which reaches nearly to the center of the prostomium and is continued into the dorsal furrow. Eyes two pairs, both large and prominent, black; the posterior one-sixth to one-eighth width of prostomium, facing nearly dorsad at posterior lateral angle, separated from concealed caudal border of prostomium by nearly their diameter and from each other by three to five times their diameter; anterior eyes one-fourth to one-sixth width of prosto- mium, on sides of ocular swellings anterior to middle and seen from above only through the tissues of the head, separated from posterior eyes by one to one and one-quarter times the diameter of the latter. Some specimens have the eyes even larger and they are always con- spicuous although the anterior are little visible from above. Median ceratophore (Pl. X XIX, fig. 29) about one-half length of prostomium but deeply inserted into sinus and scarcely reaching beyond peaks; style unknown, missing from all specimens. Cerato- phores of lateral tentacles cylindroid, fully half as long as median ceratophore but owing to position well back on ventral face of pros- tomium they are usually completely concealed in dorsal view by the cephalic peaks; styles nearly three-fourths length of prostomium, subulate, the distal one-third slender; sensory cilia elongated and enlarged. Palps about three to three and one-half times prostomial length, rather stout at base, where their diameter nearly equals one-half width of prostomium, smooth or often annulated, tapered to a short terminal filament and bearing a few lines of very small globoid sensory cilia. Facial ridge moderately prominent, reaching into mouth, which is surrounded by the usual prominent trifid lips. Peristomium obsolete above, its rather small parapodia bearing a small tuft of notopodial sete and its cirrophores not quite reaching level of prostomial peaks, largely concealed by notopodial sete of I] which spread over them; styles (PI. X XIX, fig. 29) unusually slender, 1910.] ‘ NATURAL SULENCES OF PHILADELPHIA. 305 elongated subulate with filamentous ends, without subterminal enlargement and bearing filamentous sensory cilia with rounded ends and as long as one-half diameter of style; the dorsal twice, the ventral one and three-fifth times length of prostomium. Metastomial seg- ments separated by only obscure furrows; the dorsum little convex and with scarcely noticeable transverse ridges; elytrophores and dorsal tubercles both low and inconspicuous. Venter very smooth; neural furrow and lateral muscular ridges little developed except toward caudal end. Nephridial papille begin at VI, arising from well-marked, rounded swellings at posterior base of parapodia, all small and directed dorsad into interpodal clefts. Pygidium minute with dorsal anus directed dorso-caudad and surrounded by a finely crenulated border. Anal cirri missing from all specimens but judging from the size of their scars of large size. Parapodia (Pl. XXX, fig. 31) short, less than one-half width of segments at anterior end and middle of type, longer toward caudal end and throughout the length of some specimens but never prominent, compressed, fully as deep as long, dorsal slope very steep, rami well differentiated, not greatly unequal in size. Neuropodium rather slender, divided distally into a short, broad, truncate postsetal lobe and a much longer, slender, compressed presetal lobe tapering to a blunt end and including the acicular process which terminates in a slender cirrus about two-thirds as long as the process. Notopodium relatively large, nearly as broad as setigerous portion of neuropodium which it overlaps broadly from behind, bearing a long, slender, tapered blunt, acicular process lacking a cirrus and reaching nearly to the end of the neuropodial acicular process without its cirrus. Some specimens have the parapodia studded with small spherical bodies filled with a mass resembling spores which project from the surface and which are probably parasitic in nature. Notocirrophores (Pl. XXX, fig. 31) situated close to thenotopodia and partly concealed behind their sete, subconical with swollen base reach- ing tip of notopodial acicular process; styles long and slender like tentacular cirri, regularly tapered without subterminal enlargement, bearing sparsely distributed slender cilia with globoid ends, many of them as long as diameter of style, reaching about two-fifths of length beyond tips of longest neuropodial sete and to elytrophores of opposite side. Neurocirri (fig. 31) arising behind middle of ventral face of parapodia by a small cirrophore; styles subulate, slender, reaching to base of acicular process or beyond, entirely lacking sensory cilia or with a very few minute ovate ones. Neurocirrus of II more than twice length of others. 306 PROCEEDINGS OF THE ACADEMY OF [April, Acicula of the usual form, pale yellow, the acute ends projecting freely. All sete pale yellow, all rather short and little spreading, becoming very little longer caudad. Notosete in a single ranked whorl, this arrangement obscured by their being depressed. The shortest and most curved are antero-medial and they increase in size and become straighter laterad, caudad, mediad and back nearly to starting point. They are much stouter than the neurosete, many being two and one-half to three times the diameter of the latter, more or less curved and tapering to blunt tips (Fl. XXX, fig. 33); pectina- tions extending over more than one-half of exposed portion, rather prominent, very regular, two to two and one-half rows in distance of greatest diameter, continuing nearly to tip leaving only a very short and blunt point which is smooth or more or less scupltured or even tufted. Neurosetee in vertical fan-shaped tufts directed nearly laterad. They are numerous and crowded and appear to be in four or five supra-acicular and eight or nine subacicular series. Nearly colorless with long, slender, very slightly curved shafts; the distal enlargements (Pl. X XIX, fig. 30) rather prominent and long, gracefully curved and tapered; the pectinated appendages rather long and in face-views conspicuous, finely and deeply divided, rather widely spaced, and not numerous, from sixteen in ventral to twenty-three in dorsal series, the proximal ones small; smooth ends long, often three to four times diameter of seta, with rather strongly hooked tips below which on all except the ventralmost is a very slender, acute accessory process reaching nearly to the main tooth. Elytra fifteen pairs having the usual arrangement. Very little is known of them, few remaining with the specimens. So far as known they are rather small and probably leave a portion of the dorsum uncovered. The first is circular, the next two very deeply reniform or broadly lunate (Pl. XXX, fig. 32), the others ovate reniform with a small and very excentric area of attachment. All known are soft and semi-gelatinous or gelatino-membraneous in texture and the dorsal surface is thickly studded with small conical or truncate rough- ened spines or horny tubercles among which a few longer cilia are scattered. Rather long cilia form a somewhat dense fringe along the lateral margin. In addition each elytron bears along the posterior margin, beyond which they project freely, several (4-7) large, recum- bent, inflated, ovate, deep brown, soft papillze which are usually very conspicuous and give to the elytron a very irregular outline. Entire middle field of dorsum between elytrophores deep chocolate brown, rarely paler brown, each segment marked by two delicate 1910.] - NATURAL SCIENCES OF PHILADELPHIA. 357 transverse white lines which converge and meet on each side at the dorsal tubercle or elytrophore. Parapodia, elytrophores, notocirri, neurocirri, prostomium, palps, tentacular cirri, median ceratophore and under parts unpigmented or (as preserved) white. Facial ridge, paired lips and lateral ceratophores pale brown. Elytra translucent, pale brown, the large papille chocolate. The deep solid pigmentation of the dorsum is very characteristic of this species among California Polynoide and very few examples fail to exhibit it. One small example has the proboscis protruded, 2.8 mm. long, about 1 mm. in diameter, subcylindrical, depressed at the orifice which is surrounded by nine dorsal and nine ventral papilla. Jaws deep brown, of the usual form, the fangs small, the cutting plates broad and directed laterad. This species differs from Evarne sexdentata Marenzeller especially in the character of the elytral papillation, the horny papille in the latter being pointed and often bifid, the soft papille much smaller. The sete differ but slightly. Although represented in the collection by a considerable number of specimens this species is so fragile that not a single perfect example is known. ‘The type is one of two that have all segments and both of these lack elytra and most of the cirri, etc. Not a single one possesses the median tentacle or anal cirri and only eight elytra in all are known. Most of the specimens are anterior ends of fifteen to twenty segments without elytra or cirriform appendages. Another source of imperfection is the frequency with which the parapodia are cast off, some specimens being completely denuded for a consider- able distance. There is some variation in the length and sculpturing of the tips of the notopodial setze and in the length of the cephalic peaks due to varying states of contraction. The only specimen con- taining nearly mature ova was taken at station 4,418. Two specimens were taken at stations 4,413 and 4,423; only one at each of the others. Stations 4,351, Point Loma Light, vicinity of San Diego, 423-488, soft green mud; 4,400, lat. 32° 50’ N., long. 118° 03' W., 500-507 fathoms, green mud; 4,402, off San Clemente Island, 542-599 fathoms, green mud (cotype); 4,407, off Santa Catalina Island, 334-600 fathoms, gray sand and rocks; 4,413, off Santa, Catalina Island, 152-162 fathoms, fine sand (type and cotype); 4,418, off Santa Barbara Island, 238-310 fathoms, dark mud and sand (cotype); 4,421, off San Nicolas Island, 291-298 fathoms, gray mud and rock; “4,423, same, 216-339 fathoms, gray sand, black pebbles and shells; °4.430, off Santa Barbara Island, 197-281 fathoms, black sand, pebbles and rocks; 4,436, off San Miguel Island, 264-271 fathoms, green mud, 398 PROCEEDINGS OF THE ACADEMY OF [April, * Harmothoé (Evarne) forcipata v. Marenzeller. Evarne jfocipata, v. Marenzeller, Denksch. kaiserl. Akad. Wiss. Wien, Math.- INERT, (Olle, 1e%cl IOOSQUL, jo, Sieh, Went, OES ines, 7 The type of this species, taken off Eno-sima, Japan, at a depth of 200-480 meters, is only 12 mm. long. A similar specimen taken by the Albatross at station 3,707 in Suruga Bay, Japan, in 1900 is in the collection of this Academy. Much larger specimens, three 15 mm. long, one 27 mm. long and one 36 mm. long, occur in the present collection. The neuropodial setze are of very characteristic form and agree exactly with v. Maren- zeller’s figures; those of the ventralmost series, however, are much smaller, very delicate, smooth and have simple acute tips. There are two or three rather large sete on the peristonial parapodia. The cephalic peaks are very prominent and the anterior eyes nearly twice as large as the posterior. On the first pair of scales the entire surface is thickly studded with small conical points, on the others they are confined to a broad curved marginal band projecting beyond the center of thescale. Notocirri have rather fewer cilia than figured by Maren- zeller. Nephridial papille begin on VI and are directed upward between the parapodia. Stations 4,401, south of San Clemente Island, lat. 32° 52' N., long. 118° 131 W., 448-468 fathoms, green mud, sand and rocks; 4,427, off Santa Cruz Island, 447-510 fathoms, black mud, rocks; 4,429, same, 506-580 fathoms, green mud. Antinoé macrolepida Moore. Antinoé macrolepida Moore, Proc. Acad. Nat. Sci. Phila., 1905, pp. 538-541. Pl, XXV, figs. 21-23. The anterior end of a single specimen with the pectination of the notopodial setze even finer than usual but quite typical in every other respect. When intact in the parapodia the distal halves of the neuro- podial fascicles of sete have a distinct orange color. Station 4,523, Monterey Bay, Point Pinos Light, 75-108 fathoms, soft dark mud. - Antinoé anoculata sp.nov. Pl. XXX, figs. 34-40. A fragile species which reaches a larger size than the average in this family. All of the three specimens lack the caudal end, the type being most complete. Form much depressed, with long parapodia and the body strongly tapered from near the cephalic end. The type measures 36 mm. long; width at X, of body only 4 mm., between tips of para- podia 11 mm., between tips of sete 14.5 mm. Prostomium (Pl. XXX, fig. 34) slightly longer than wide, the widest 1910.] / NATURAL SCIENCES OF PHILADELPHIA, 309 region little more than one-third from the posterior end where the sides swell out abruptly and prominently; from this point the sides are nearly straight and converge rapidly to the anterior lobes which are small and separated by a wide fissure occupied by the base of the median tentacular ceratophore; cephalic peaks minute, well separated from the median ceratophore and well above and free from the lateral tentacles. Dorsum of prostomium very smooth, prominently elevated posteriorly and sloping regularly to the peaks; median furrow very slightly developed and no trace whatever of pigmented eyes. Median tentacle (PI. XXX, fig. 34) with large ceratophore nearly or quite one-half the length of the prostomium and rapidly tapered from the broad base which is inserted for only a short distance into the prostomium and united to its anterior lobes. Style slender, delicate, flagelliform and regularly tapered to the end; scarcely twice length of prostomium. Lateral tentacles arising from small, slightly tumid ceratophores beneath peaks and at a level lower than the median ceratophore; the styles small, about as long as median ceratophore, subulate, tapering to slender tips. Palps slender and elongated, nearly twice median tentacle, regularly tapered, smooth, terete, longitudinally striated and terminated by a minute filament. Facial ridge prominent, reaching to trifid mouth which is bounded by rugous lips. All cephalic appendages thickly clothed with minute sensory cilia which on the palpi are scarcely elevated above the surface. Peristomium obsolete except laterally where it is crowded far forward in the form of parapodia bearing the tentacular cirrophores, which reach the level of the prostomial peaks, and a small achzetous acicular lobe. Styles of tentacular cirri resembling median tentacle, smooth, slender, tapered, and lacking subterminal enlargements, the dorsal about equalling, the ventral three-fourths as long as the median tentacle. Body rather narrow and depressed, regularly tapered from near the anterior end; below with prominent lateral muscular ridges bounding a furrow in which is a prominent neural ridge. On the dorsum each segment is marked with deep transverse depressions. Nephridial papillae begin on VI, arising from the sides of small eleva- tions in the usual position; they soon become long tubes curved upward and backward into the interpodal furrows. Pygidium un- known. Parapodia (Pl. XXX, fig. 35) very prominent, on anterior segments quite equal to width of body, posteriorly still longer, projecting strictly laterad, the base broad and compressed, the rami well-differ- entiated. Notopodia rather prominent projections from the strongly 360 PROCEEDINGS OF THE ACADEMY OF [April, sloping face of the parapodia, convex dorsally, its ventral border prolonged into a slender, tapered, acicular process from the extreme end of which the tip of the single stout aciculum projects. _Neuropodia very large, sloping from both dorsal and ventral borders to a blunt tip from which projects a blunt, stout acicular process bearing a finger-like terminal cirrus beneath which the tip of the aciculum appears. Notocirrophores arise immediately above and behind notopodia; they are unusually long and slender and nearly equal the length of the notopodium with its acicular process (fig. 35); styles also long and slender, reaching beyond mid-dorsal line and fully one-third of their length beyond tips of longest neuropodial sete, regularly tapered to slender tips without subterminal enlargements and bearing a few very snort clavate sensory papille. Neurocirri very small, arising near middle of ventral face of parapodium and scarcely reaching to ventralmost row of neuropodial sete, slender, tapered, subulate and quite smooth. On somite II the rami are nearly equal and the neuro- cirrus reaches nearly to the sete tips. Elytrophores low and inconspicuous, borne on somites IJ, IV, V, VII and alternate segments to XXIII, XX VI, XXIX=14, a fifteenth on XXXII being probably normal. Dorsal tubercles, which alternate with elytrophores, small but rising prominently above the level of the dorsum, especially on anterior segments. Elytra very readily detached,,. large and completely covering dorsum, except the first, which is cir- cular with central attachment, the others broadly ovate-reniform with oval scar antero-mediad of center (Pl. XXX, fig. 36). Texture soft and membranous; to the naked eye surface appears smooth and lacking cilia; under the microscope they exhibit an area of minute tubercles between the scar and the anterior border, a slightly granular surface elsewhere and a few minute cilia along the margin. The nerves, branching and radiating from the sear, are conspicuous through the translucent tissues. Many of the elytra are covered with a greenish- yellow incrustation with oblique parallel streaking. Acicula single, deep yellow, of the usual stout, tapered form with simple tips. Sete all pale straw-colored, long, forming prominent tufts. Notopodials much stouter than neuropodials, the fascicles forming whorled tufts directed more laterad than dorsad; the sete (PI. XXX, figs. 39, 40) very slightly curved, tapered to blunt-pointed, smooth tips below which are very numerous close rows of teeth so fine that they can be differentiated only under high magnification. Somite I (peristomium) possesses two short séte of this type pro- . 1910.] “+ NATURAL SCIENCES OF PHILADELPHIA. 361 jecting from below the tip of the aciculum. Neuropodial sete (P . XXX, figs. 37 and 38) more numerous, arranged in three supra-acicular and six or seven subacicular series. All much longer than the notopo- dials but averaging only about one-third their diameter; the shafts long and distal enlargements inconspicuous, slightly curved and tapered to long, prominent but not especially slender smooth tips, below which are narrow pectinations which become longer and more prominent distad. Sete of! the two dorsal rowsiR(fig. 37°) are especially slender, with the little enlarged pectinated regions taking up about half of the exposed portion and bearing thirty-five or more pairs of pectine. Those of middle rows (fig. 37°) are stouter and bear about thirty pairs of pectinee of which the basal ones are. mere striations, the smooth tips being especially elongated. Sete of the ventralmost row (fig. 37°) have much shorter distal regions with fewer pectine and very acute tips. Posteriorly all setee become longer and more slender. Except for a slight duskiness in places pigment appears to be wanting but the cuticle exhibits a purplish iridescence. In the character of its sete this species departs somewhat from the typical condition and approaches Hunoé. Stations 4,381, off North Coronado Island, vicinity of San Diego, 618-667 fathoms, green mud; 4,517, Monterey Bay, off Point Pinos Light, 750-766 fathoms, green mud and sand (type and cotype). Gattyana senta Moore. Gattyana senta Moore, Proc. Acad. Nat. Sci. Phila., 1902, pp. 259-263 Pi, XIII, figs. 1-13. One specimen occurs in the collection from each of four stations and two from a fifth. Most of the very characteristic and remarkably protected elytra are in place; often they are blotched with brown; the marginal spines of posterior elytra have extremely long acute prongs. As Treadwell states the nephridial papillae begin on VI but the anterior ones are very small. A medium-sized example has the proboscis protruded. It measures 4.5 mm. long, 3.6 mm. deep at the middle and 2.4 mm. wide at the end, being truncate subfusiform in shape, compressed at the base, depressed at the aperture; Apertural papille nine above and nine below, rather long, blunt at the end. Jaws pale brown, of the usual form, wita fang and cutting plate, the ventral somewhat larger and biting to right of upper. Stations 4,361, Point Loma Light, vicinity of San Diego, 91-97 fathoms, gray sand, mud and rock; 4,377, same, 127-299 fathoms, green mud and sand; 4,420, off San Nicolas Island, 32-33 fathoms, 362 PROCEEDINGS OF THE ACADEMY OF [April, fine gray sand; 4,463, Monterey Bay, off Point Pinos Light, 48-111 fathoms, rocky; 4,532, same, 30 fathoms, gray sand and rocks. Nemidia microlepida sp. nov. Pl. XXX, figs. 42-44; Pl. XXXI, figs. 45, 46. The single specimen known fortunately retains the full number of segments and is a long, slender, depressed worm of very even width. Number of segments 85; length 58 mm.; width at X, body only 2.5 mim., spread of parapodia 7.2 mm.; at L, body 2 mm., spread of para- podia 6.8 mm.; greatest depth about 2 mm. : Prostomium (Pl. XXX, fig. 42) small, slightly wider than long, greatest width a little behind the middle where the sides project prominently; anterior to this point the sides are straight and con- verge strongly to the minute peaks which lie very close to but free from the median ceratophore; anterior fissure rather deep but com- pletely filled by the median ceratophore which is soldered to the prostomial lobes, not more than its distal third being free. Eyes wanting. Median tentacle stout and swollen in the middle, com- pletely filling cephalic sinus and coalesced with the prostomium, on the dorsum of which it rises as a ridge, the distal third free. Style short, about one and one-third times length of prostomium, rather slender, the distal one-third tapering to a short filament. Lateral tentacles (fig. 42) arising from short, thick ceratophores which are united in the median line below the median ceratophore, at the sides of which they are largely exposed; styles short, rather stout and subulate, tapering to very short terminal filaments, their length one- half or less of median style. Palps (fig. 42) imperfect from sloughing of their ends, rather short, little exceeding twice head, thick, little tapered till near end, terete and perfectly smooth, without sensory cilia. Peristomial parapodia (Pl. XXX, fig. 42) short and thick, diverging above base of palps, supported by a single stout aciculum, the tip of which appears in a dorso-median position; apparently achstous; cirrophores united nearly to their ends; styles like median tentacle and the dorsal of equal length, the ventral slightly shorter, both rather stout, tapered to a short terminal filament and lacking sensory cilia. Body narrow, at widest part only one-third of width between ends of parapodia and posteriorly, where the parapodia are longer, much less than that; tapering very gently and regularly caudad. Seg- ments well defined, each bearing on the dorsum two prominent, blunt, median papillee in tandem, all together forming a series which becomes higher and more crowded posteriorly, finally constituting an almost continuous serrated crest. On the ventral side the usual 1910. } “ NATURAL SCIENCES OF PHILADELPHIA. 363 neural furrow is bounded by low, smooth, lateral muscular ridges. Nephridial papilla begin on VI in the usual position and soon become prominent, strongly clavate, appendages having a length about one- half the diameter of the foot and projecting freely ventro-latero- caudad. Pygidium a short tube bearing a pair of cirri about as long as the median tentacle but much more slender. Parapodia (Pl. XXX, fig. 48) long, directed strictly laterad and enhancing the appearance of depression; posteriorly they are rela- tively long so that the extreme width remains nearly uniform. Typical parapodia are scarcely compressed, subconical in form, with the end obliquely truncate. Rami very unequal, the notopodium a scarcely differentiated process about halfway between the notocirrus and tip of the neuropodium consisting chiefly of a rather short subconical acicular process. Neuropodium large, little tapered, its obliquely beveled end slightly compressed and divided into a low presetal lip, slightly prolonged into a short acicular process surmounted by a short, somewhat flattened supra-acicular cirrus, and an equally low post- setal lip. On the first two parapodia the neuropodium is shorter and the notopodium larger; at the caudal end this condition is reversed, the neuropodium becoming very long and slender. Notoeirrus (Pl. XXX, fig. 43) arising from behind base of parapodium far mediad of notopodium, its cirrophore short and stout, directed nearly laterad, style moderately slender with the distal half tapering to a terminal filament which reaches barely beyond the end of the neuropodium and not nearly to the middle line; it bears afew scattered, short, clavate sensory cilia. Neurocirrus arising from a very low cirrophore on ventral side of foot halfway between nephridial papilla and ventral border of neuropodial setze bundle but is so short that its tip fails to reach either; basal half thickened, tapered to a filamentous distal third, bearing a few cilia like those on the notocirrus. Acicula of the usual character, the neuropodial especially stout and the blunt tips of both projecting shghtly. Sets very imper- fectly known, all except those on a few segments at the ends of the body being broken off flush with the surface. Most of those remaining, like the exposed tips of the acicula are encrusted with a reddish deposit. The description necessarily refers to setee at the ends of the body, those -of the middle segments being probably shorter and stouter. Noto- podials a small tuft, colorless, very slender and capillary with close fine serrations for nearly entire length. Neuropodials (Pl. XNXNIJ, figs. 45 and 46) in moderate number, forming an obliquely vertical fascicle not arranged in the usual horizontal series, colorless, all deli- 364 PROCEEDINGS OF THE ACADEMY OF [April, cate; when complete the distal thickening tapers into a long tenuous tip armed with conspicuous pectinations. Very few setze possess ti is tip, being broken off just beyond the thickening as shown in figure 46 but it is probable that the filament is normally present in all. Elytrophores on’ Tl) LV; VaVail, 1X, Xap OO eV OX Vie Xe XXI, XXIII, XXVI, XXIX and XXXII = 15. All other metas- tomial somites bear notocirri and dorsal tubercles. Elytrophores are situated close to the posterior border of the base of the parapodia and slightly mediad of the alternating notocirrophores. They are very small and little elevated with depressed circular centers. Dorsal tubercles are scarcely noticeable on anterior segments but rather better developed behind the elytrophores region. Elytra (Pl. XXX, fig. 44) rather firmly attached but so small that they were at first overlooked altogether. They about equal the antero-posterior diameter of the parapodia and because of their posterior position slightly overlap the following foot and leave the anterior portion of the one to which they are attached uncovered. The lateral border reaches the lateral side of the notocirrus and the mediad border falls far short of the base of the parapodium, the body being of course, entirely uncovered. They are not in the slightest degree imbricated but are separated by a space equal to at least one- half their own diameter. All are rather thick, firm and leathery, circular or nearly so with the circular or elliptical scar close to the anterior border; the cuticle thick and smooth, without trace of surface or marginal cilia or papille; the interior finely granular and opake. Extended proboscis 4.5 mm. long, 3.5 mm. wide at end; stout, terete at base, somewhat depressed at end; seven blunt bifid papille above and seven below, the lateral pairs of most polynoids wanting. Jaws rather thin, the median sutures obliterated, forming above and below an entire transverse plate of a gray color thickened near middle line by a pair of brown ridges that rise into very small points cor- responding to the fangs of other polynoids. No color or pigmentation. Station 4,522, Monterey Bay, off Point Pinos Light, 149-130 fathoms, gray sand and shells (type only). Next follow the descriptions of four very imperfectly known blind species described from very imperfect material. They are not very closely related but owing to my doubts regarding their generic designa- tion and my hesitation to establish any new genera that more complete knowledge may show to be superfluous all are here provisionally placed in the genus Polynoé. 1910.] J NATURAL SCIENCES OF PHILADELPHIA. 365 Polynoé(?) remigata sp. nov. Pl. XXXI, figs. 47-51. Described from a single incomplete and mutilated specimen having 18 setigerous segments and measuring 17 mm. long, with a maximum body width of about 3 mm. and a width between sete tips of about 10 mm. Prostomium (Pl. XXXI, fig. 47) about one-third wider than long, consisting of two broadly pyriform smooth lobes with broad spheroidal ends caudad, the anterior ends narrower but rounded, without dis- tinct peaks. Anterior fissure deep, reaching to middle of prostomium and continued to its posterior border by a narrow furrow. Pigmented eyes totally absent. Median cerataphore arises near middle of head and occupies anterior fissure, moderately stout and cylindroid; style missing. A pair of small swellings below the anterior ends of the cephalic lobes probably represent the bases of the lateral tentacles, the rest of which is missing. Palps both present but the left only perfect, rather small, their basal diameter not exceeding one-third of the width and their length two and one-half times the length of the prostomium, smooth, tapered, with no sensory cilia and no dis- tinct terminal filament. Peristomium a short but quite distinct ring united to the median furrow of the prostomium by a slight median fold. Its parapodia (Pl. XXXI, fig. 47) fail to reach anterior border of the prostomium, Its ceratophores distinct distally. All styles except the left peristomial notocirrus, which has grown fast to the base of the palpus, lost. It (fig. 47) is slightly longer than the palpus, has a slight subterminal enlargement and a short but pronounced terminal filament and lacks sensory cilia. Few parapodia are perfect. In the middle region (Pl. XX XI, fig. 48) they are little longer than the width of their segments, compressed at the base, the rami well differentiated. Neuropodium elongated, with nearly parallel borders terminated by a short, slightly convex postsetal lip and a pointed presetal lip which is prolonged into a slender, spine-like acicular process nearly the length of the free neuro- podium and bearing a short terminal cirrus. Notopodium rather large, more than half as long and half as deep as the neuropodium, truncated conical; the ventral border prolonged into a straight, stiff, slender, blunt-ended acicular process more than one-half the. length of that of the neuropodium. All notocirri and neurocirri lost; noto- cirrophores (fig. 48) very large (probably swollen in preservation), well separated from notopodium. All elytra missing; elytrophores borne on base of feet of somites II, IV, V, VII, IX, XI, XIII, XV and 366 PROCEEDINGS OF THE ACADEMY OF [April, XVI, high and prominent. Dorsal tubercles rather long and slender. Nephridial papille thick and very short. Acicula rather slender, of usual form. Notopodial setze very few, usually three to six very closely appressed to acicular process, pale yellow, slightly stouter than neuropodials, straight, blunt and with the transverse lines of teeth extremely close, fine and numerous, appearing under 500 diameters as scarcely discernible transverse lines (P]. NXXI, fig. 49). Neuropodials (figs. 50 and 51) numerous, forming dense rather long brushes, colorless and delicate, the ends flattened but not much expanded, the marginal serrations very fine and the point rather acute. Colorless. Station 4,407, off Santa Catalina Island, 334-600 fathoms, gray sand and rocks (type only). Polynoé(?) fllamentosa sp. nov. Pl. XXXII, figs. 52-56. known from a single imperfect and incomplete specimen consisting of 24 setigerous segments, 17 mm. long, the body 2.5 mm. wide and the width between seta tips 8.5 mm. lound with P. remigata and somewhat resembling that species but with the body more slender and the sete quite different. Prostomium unknown, being much macerated and torn and all cephalic appendages lost. No elytra are in place; elytrophores rather small and elevated, farther out on parapodia than on P. rem- gata; borne on the usual somites on the anterior region of the body. Dorsal tubercles very long and slender, especially on posterior segments on which they reach nearly to the ends of the notocirrophores. Nephri- dial tubercles very short and rather thick and truncated. Parapodia (Pl. XX XJ, fig. 52) closely similar to those of P. remigata, the notopodium not so well separated, more conical and tapered and the acicular process stouter at the base and also more tapered. Noto- cirrophores arise above base of notopodium and are much smaller than in P. remigata. A single style remaining on somite XVIII is remarkable for its great length and tenuity, which may be enhanced by abnormal stretching. It is more than one-half the entire length of the worm or twice the total width of body and parapodia, flagelli- form without subterminal enlargement or sensory cilia. Neurocirri (fig. 52) arise halfway between nephridial papille and end of ventral border of neuropodium to which they reach; they are slender and uniformly tapered. Notopodial setze moderately numerous, forming somewhat promi- nent radiating bundles. They are colorless, rather coarse (Pl. XX XI, fiz, 54) nearly straight, tapering to acute points (fig. 53) and bear 1910.] , NATURAL SCIENCES OF PHILADELPHIA. 367 rather conspicuous half-round ensheathing plates with entire or nearly entire margins along one side. Neuropodial sete (fig. 55) are very numerous and form dense brush-like bundles as in P. remigata but the sete are considerably stouter than the notopodials, with broad, paddle- like distal expansions (fig. 56) having simple marginal serrations which become rather coarse toward the subacute tip. The only pigment is a little of reddish brown color on the elytrophores. Station 4,407, off Santa Catalina Island, 334-600 fathoms, gray sand and rocks (type only). ” Polynoé(?) aciculata sp. nov. Pl. XXXI, figs. 57 and 58. A single very imperfect specimen, with 18 setigerous segments and measuring 9 mm. long and 7 mm. between the sete tips, represents this species, Prostomium distorted, much contracted and bent dorsad by the protruded proboscis. It is about twice as wide as long and deeply divided by a median fissure into a pair of anteriorly divergent, rounded lobes from between which a small cylindrical median ceratophore, from which the style has been lost, arises. The lateral tentacles and palps also are missing and there is no trace of pigmented eyes. A single ventral tentacular cirrus remains and is a slender, tapered style without subterminal thickening and about twice as long as the width of the prostomium. The body is slightly depressed and somewhat fusiform, the segments well defined and rather longer than usual, most of them being nearly half: as long as wide. Elytrophores on IJ, IV, V, and alternate seg- ments to XVII, small, low, at base of parapodia and widely separated from notopodial ramus. Dorsal tubercles very small slightly hooked laterally, situated in line with elytrophores. Nephridial papille not obvious. Parapodia largely lost or injured and those remaining evidently considerably retracted (Pl. XXXI, fig. 57). Their length does not exceed the width of the segments and they are strongly compressed and about as deep as long, the rami very unequal. Neuropodium with steep dorsal border and truncate end, the presetal lip of which is produced into a long, stiff, acute, spine-like acicular process which appears to lack a terminal cirrus. Notopodium a contracted achztous subconical tubercle prolonged into an acicular process similar to that on the neuropodium and nearly as long, usually slightly curved. Notocirrophores (fig. 57) arising in contact with the notopodial tubercle far out or parapodium, prominent and rather long; noto- 368 PROCEEDINGS OF THE ACADEMY OF [April, cirrostyles flagelliform, smooth, reaching beyond the tips of the longest setee, only a few in place. No neurocirri remaining. — Both acicula are rather stout, the distal ends being less attenuated than usual and apparently not perforating the integument of. their processes; they are longitudinally striated throughout. No trace of notopodial setze can be detected. Neuropodial sets are numerous and form a dense silvery white, flat brush not divided into horizontal series and nearly twice as long as the foot. They are straight, delicate and colorless with slender shafts and thin expanded distal ends tapered to blunt points. The margins are serrated with short, appressed teeth which are rather course on dorsal sete (Pl. XXXI, fig. 58), very fine on those in the ventral part of the bundle. Proboscis clavate, strongly depressed distally, 4 mm. long, 2.2 mm. broad and 1.3 mm. deep at distal end. Orifical papilla rather small, nine above and nine below in close series. Jaws deep brown, hard; the fangs prominent; the cutting plates rather small and directed transversely, the ventral biting inside dorsal. The specimen is of a nearly uniform pea-green color quite probably the result of staining. Station 4,352, off Point Loma Light, vicinity of San Diego, 549-585 fathoms, green mud (type only). Polynoé(?) renotubulata sp.nov. Pl. XXXI, figs. 59-64. Known from the type only—a much mutilated specimen consisting of 35 somites which measure 26 mm. long, with a width of body just behind middle of piece of 3.6 mm., between ends of parapodia of 13 mm. and between tips of sete of 22 mm. Prostomium (Pl. XXXI, fig. 59) shaped much like that of Polynoé longipedata McIntosh but shorter, the length being about two-thirds width, without the lateral ceratophores subrectangular; posterior region constricted to form a sort of pedicle, anterior to which the prostomium abruptly expands into a pair of opake hemispherical prominences forming its widest part and corresponding to the ocular lobes, within which the opake white bodies are probably modified eyes lacking every trace of pigment. Anterior to these lobes the prostomium is more translucent and tapers slightly into the lateral ceratophores and anterior margin. There is no anterior sinus, dorsal furrow or cephalic peaks. Median ceratophore arising on dorsal surface posterior to middle, short, thick, its diameter more than one- third width of prostomium; its free ends with a deep rim deficient anteriorly and projecting at the sides as rounded lobes possibly eor- responding to the tentacular scales referred to by McIntosh in his 1910.] “ NATURAL SCIENCES OF PHILADELPHIA. 369 description of P. longipedata, Ceratophores of lateral tentacles cylindrical, continuous with the sides of the cephalic face of the pros- tomium and separated by about their own diameter or more, their length about one-fourth of prostomium, projecting straight forward; styles three times length of prostomium without ceratophores. Palps very large, stout at base where they very nearly equal width of pros- tomium, length about six times prostomium, tapered to rather blunt tips lacking a terminal filament; surface smooth and without raised lines or sensory cilia. Peristomium little developed, concealed largely by prostomium, its parapodia with large ceratophores and apparently achetous. Styles of tentacular cirri long, slender, and regularly tapered, the dorsal as long as the palps, the ventral slightly shorter (Pl. XX XI, fig. 59). Body generally subfusiform. Anterior segments narrow, those following widening to middle of piece and decidedly depressed (partly the result of injury), then tapering again to caudal end which terminates in a small pygidium with dorsal anus from which the cirri have been lost. Segments fairly well differentiated, smooth dorsally, the venter with neural furrow and prominent. neural ridge. Nephridial papille (Pl. XX XI, fig. 60) very remarkable. They begin on VI, arising in the usual position at the posterior base of the foot and directed dorsad into the interpodal cleft. At first they are delicate and not longer than the diameter of the foot but they rapidly increase in length until at XIV they reach the end of the neuropodium and on following segments extend considerably beyond it as far as the tip of its long acicular process. They are very slender, tapering at the base and filiform for most of {their length. Posteriorly they become again shorter. Just how these long papille are disposed in the living worm is uncertain but several occupy the position shown by the dotted lines in the figure, passing between the parapodia and in a groove along the posterior face of the one to which they belong to end at the base of the fascicle of neuropodial sete. Probably this is the normal position but a larger number and especially some longer than the one figured rise, as shown by the solid lines, like dorsal cirri above the parapodia and back. Elytrophores and dorsal tubercles of moderate size but most of them abnormally inflated, precluding an accurate description ; the former situated on II, IV, V and alternate seements to XXIII, then on XXVI and XXVIII = 14. Owing to the mutilation of the specimen this distribution cannot be affirmed with entire certainty and it is probable that a fifteenth pair of small ones may exist on the reduced segments at the caudal end. 370 PROCEEDINGS OF THE ACADEMY OF [April, Parapodia (Pl. XXXI, fig. 60) remarkably elongated ; many have been torn away or injured but a sufficient number remains to make evident their noteworthy features. They are much longer than the width of the segments to which they are attached, are compressed at the base and tapered into the neuropodium which is slender with nearly parallel dorsal and ventral borders, slightly compressed and subtruncate distally, the presetal lip longer and somewhat pointed and prolonged into a delicate, acicular process fully half as long as the ventral border of the parapodium and tipped with a short, blunt cirrus overhanging the projecting point of the aciculum. Notopodium scarcely separated from neuropodium, its basal part a small, slightly inflated cone bearing a small tuft of delicate capillary sete and prolonged into a delicate, slightly curved, almost fiber-like acicular process as long as that of the neuropodium. Above and proximad of the neuropodium is a small notocirrophore and slightly further proximad the slghtly developed connate dorsal tubercle alternating with the larger elytro- phores. All notocirrostyles are lost but the appearance of the cirrophores indicates that they are quite small and perhaps rudimentary and it may be that the nephridial papille assume some of their functions. Neurocirri (Pl. XXXI, fig. 60) arise from shght cirrophores proximad of the middle of ventral border of parapodia, somewhat inflated (perhaps abnormally) at the base and tapered to delicate tips which reach the base of the nephridial papilla but fall considerably short of the ends of the neuropodia. Anteriorly they are relatively larger and the large cirrophore of II indicates that the lost style is of large size. Acicula single in each ramus, yellow tinted, much prolonged into delicate, fragile ends which reach to the ends of the acicular processes enveloped in a thin integument beyond which the tip of the neuro- podial alone projects. Notopodial setz a small tuft of very delicate, smooth and long fibers. Neuropodials (Pl. XXXII, figs. 62-64) form a long and dense, flattened, brush-like fascicle projecting conspicuously laterad and slightly dorsad. They are nearly colorless, vitreous and have a fine satiny luster. The shafts are long and delicate, the distal expansions relatively short but very broad and oar-like, gradually widening to near the end and then rather abruptly tapered to a bifid tip (fig. 63); marginal serrations are slightly developed along the convex border, longest at the point of greatest width and becoming obsolete toward the tip. A single elytron (Pl. XX XI, fig. 61) only—the first one of the left side 1910.] “ NATURAL SCIENCES OF PHILADELPHIA. 371 —is known. It is attached to II and covers most of the prostomium and immediately adjacent region. It is irregularly orbicular with a very small subcircular scar of attachment, remarkably thick, soft and of cushiony texture, the outer surface and borders everywhere thickly covered with peculiar large, soft hemispherical or dome-shaped soft papillae, each bearing at its summit a single coarse filament or cillum. Postero-laterally these become larger and frequently con- fluent in twos and threes to form bilobed of trilobed papille. The specimen is entirely unpigmented; the cuticle is thin and the tissues delicate and translucent with large nerves visible through it. In many places the tissues are more or less inflated. These appear- ances call to mind the conditions of the similarly abyssal Laetmonice. This species is closely related to the imperfectly known Polynoé (Adametella) longipedata McIntosh from the North Atlantic, but the latter has stout notopodial sete peculiarly bifid at the tips. Station 4,397, off Santa Catalina Islands, lat. 33° 43’ N., long. 117° 42’ W., 2,196-2,228 fathoms, gray mud (type only). APHRODITIDZA. The type genus abounds in this region, being represented in the collection by five species, two of which are evidently abundant. They vary in size from the little aberrant A. parva, sometimes less than ten millemeters in length to huge bulky specimens of A. japonica seven inches in length and nearly three inches wide. Three of the species have not been described previously. Less common is Laetmo- nice, represented by two species, one of which (L. producta wyvillet) occurs at the greatest depth (2,228 fathoms) at which Polycheta were taken by this expedition. Aphrodita armifera sp. nov. Pl. XXXI, figs. 65, 66; Pl. XXXII, figs. 67-75. This very noteworthy species is represented by a single specimen. From broad ovate, the anterior end broadly rounded, the greatest width at XV, which is the middle of the length, the width rapidly reduced after XXI, and segments after XXVII forming a slender attenuated caudal region. Moderately depressed, the dorsum less arched than in many species and covered with a thin, clean layer of felt fibers at the sides of which the great lustrous brown spines are quite uncovered and rise over the back much as in a Hermione, the largest ones meeting or nearly meeting in the middle line. Prostomium (Pl. X XXII, fig. 67) deep sunken between the parapodia of I and II and completely concealed by the elytra and felt, regularly ellipsoidal, the width about one and one-third times the length; 372 PROCEEDINGS OF THE ACADEMY OF [April, posterior margin subtruncate and united to the peristomium by a median nuchal fold, which is about one-fourth as wide as the prosto- mium and slightly arched. Ocular peduncles small, hemispherical, close together on anterior margin, the right bearing two small black eye-specks, the left lacking them. Tentacle arising from frontal face immediately below ocular prominences, bent downward, very short, not more than one-fourth length of prostomium, consisting of a very short ceratophore and a scarcely longer obpyriform style. Palpi -moderately long and slender, about six times length of prostomium with a scarcely distinguishable basal segment, the cuticle smooth and polished to the naked eye but bearing numerous very fine sensory cilia just visible under a magnification of fifty diameters. Facial caruncle a thin compressed plate with somewhat serrated free border, covered with small round papille, the ventral process very short. Peristomium represented dorsally by a short transverse fold, ven- trally by small anterior lips; its parapodia (fig. 67) reaching about half their length in front of the prostomium. Tentacular cirri with well-separated stout cirrophores, the styles long and slender, with distinctly bulbous tips preceded by a constriction and slight subter- minal enlargement; the dorsal about one-half length of palps and directed upward, the ventral slightly shorter than dorsal and directed downward. Mouth bounded by the peristomium, somite il and posteriorly by a broad, nearly smooth lip which divides HII into a pair of lateral swellings and reaches to IV. Metastomial segments indicated on the venter by transverse integu- mental ridges on a nearly flat surface bounded laterally by a shallow trench along the bases of the parapodia and divided into a median translucent neural third and lateral muscular thirds; cuticle thickly studded with small globular papille. Dorsally the segments are ill-defined, without distinct bounding furrows and with thin integu- ments and powerful lateral muscle ridges; cuticle thin and thickly studded} with minute papille (Pl. XXXI, fig. 66). Pygidium slightly cleft for the terminal anus which does not cut through several segments. Elytra fifteen pairs on II, IV, V and every alternate segment to XXIII, then apparently on XXV, XXVIII and XXXI though the last three are somewhat doubtful. They are of large size and are broadly inbricated, completely covering the dorsum beneath the felt, colorless, translucent without markings or incrustations of any kind, soft and thin but tough and leathery. First three pairs elliptical with major axis transverse; several following nearly circular with attachment anterior to center; proceeding caudally they become 1910.] - NATURAL SCIENCES OF PHILADELPHIA. 373 successively longer and the line of attachment, which extends from the middle to the lateral margin, shifts to a more posterior position. Those of the last pair are nearly three times as long as wide, tapered posteriorly and are attached about one-fifth of their length from the anterior end. They fold round the slender caudal region and reach beyond the anus, the edges meeting to form a nearly complete tube. Owing to the rigidity of the dorsal spines and my desire to injure them as little as possible the dorsal fimbriated organs were incom- pletely studied. Apparently they begin on VI and occupy all cirrifer- ous somites as far as XXVIII, occurring in the usual position near the posterior border of the segments at the level of the lateral border of the elytrophore. They are small and thin, compressed and deeply fimbriated, the middle ones bearing seven to nine rather long, simple or bifid cirriform papille (Pl. XX XI, fig. 65). Parapodia of the usual form, biramous. Neuropodium stout, supported by a single very stout aciculum, truncate, rough and at the end stepped for the three series of sets, the surface, except dorsally densely covered with spherical papillae of various sizes but averaging larger than those on the ventral surface of the segments. Notopodium a low, thick ridge prolonged to the dorsum. Neurocirrus arising from a low cirrophore located somewhat distad of the middle of the neuro- podium and covered with crowded spherical papille of the largest size ; style smooth, rather slender, tapered to a slightly bulbous tip which reaches to about base of middle series of sete. Notocirrus with large eylindroid cirrophore arising just behind the ventral fascicle of noto- podial setze; style reaching to about tip of second largest spine of this group, slender, smooth, tapered to a distinct subterminal enlargement beyond which is a constriction and terminal ball. Peristomial para- podia (Pl. XXXII, fig. 67) small, slender and directed forward, sup- ported by a single aciculum which terminates in the somewhat enlarged end bearing three dense tufts of fine capillary sete. At the caudal end both rami become free and prolonged laterally and the notopodium lamelliform with a prominent acicular process, while the notocirri are relatively longer with very conspicuous terminal bulbs. Neuropodial sete in the usual three horizontal series. On middle segments the ventral series consists of five or six equal, brownish yellow, rather slender and slightly curved sete, the end (Pl. XXNIT, figs. 72 and 73) enlarged, tapered to a slightly hooked, acute tip and usually bearing a pair of small spurs and a few scattered tubercles. Middle series of three, brown, becoming stouter caudad, all smooth, gently curved, tapered without evident enlargement (fig. 71). Dorsal ov4 PROCEEDINGS OF THE ACADEMY OF [April, series usually of two stouter, deep glistening brown, nearly straight spines (fig. 70). All middle neuropodial sete are quite free from hairs and nearly or quite smooth. Toward the caudal end they become gradually elongated with increasing asperities and finally pale-yellow subcapillary setze roughened with numerous short spines more or less regularly alternating on the two sides (fig. 75). The usual dense fascicle of pinnate sets replaces the ventral neuropodials on I. In this species, so far as can be determined from a single specimen the spiral pennon is less developed than on the other species (fig. 74). Notopodial setze consist of stout, fragile spines and flexible fibers. The former (Pl. XXXII, fig. 68) are deep lustrous brown and form a conspicuous bristling armature penetrating the felt at the sides and pro- tecting the sides and dorsum of the body for its entire length. They are more or less flattened, slightly curved near the base, then straight, very rigid and tapered to subacute points. The core is striated longitudinally and here and there fractured transversely and the hard outer shell is roughened by numerous small tubercles which increase in size toward the distal end until they are just visible under a magnification of four or five diameters (fig. 67). These spines are arranged in a dorsal and a ventral group on each segment. Ventral on middle segments of nine to eleven arranged in a vertical series and rapidly increasing in size from below dorsad, the most dorsal many times larger than the most ventral and more recumbent on the felt. Posteriorly they become longer and more recumbent and anteriorly shorter and more erect. Dorsal fascicles usually consist of two small oblique rows of five or six but on elytrophorous segments may be limited to a single somewhat longer row. These increase in size postero-caudad, the last of each series being much flattened and very long so that they cross those of the opposite side in an abattis-lke arrangement. Ante- riorly they are short, more erect and do not cross. At the extreme caudal end they become quite slender. Fibers arise as usual in three tufts, the dorsal felt being formed by the intermediate tufts on all parapodia and by the larger dorsal tufts on elytrophorous segments only. They are exceedingly long and fine with peculiarly hooked tips and interlace to form the even but rather thin layer of felt which in this specimen is free from silt. The ventral or lateral tuft consists of much shorter, coarser, roughened fibers with straight fine points which do not felt but hang in loose fringes behind the parapodia. They correspond to the iridescent fibers of other species but nearly lack this quality and are dull gray and more or less covered with silt. £910.] “ NATURAL SCIENCES OF PHILADELPHIA. 375 No color. Much affected with attached parasites which are often arranged with remarkable symmetry on the dorsal side. Station 4,557, Monterey Bay, off Point Pinos Light-house, 28-40 fathoms, rocky. In general appearance this species resembles A phrodita (Letmonice) aphroditiodes (McIntosh) but the set differ and the palpi are much stouter. The most striking characteristics are the formidable rows of long, stout, lustrous, brown spines which posteriorly meet over the back, and the entire absence of brilliantly iridescent lateral fringes. *Aphrodita japonica v. Marenzeller. Aphrodita japanica v. Marenzeller, Denks. K, Akad. Wissensch., Wien, XLI (1879), pp. 111 and 112. This species has been reported already* from the dredgings of the “‘ Albatross”’ as occurring on our coasts from the Gulf of Georgia to Alaska. The Academy of Natural Sciences possesses two very large and bulky specimens nearly seven inches long collected by Professor Harold Heath in 12 fathoms at Pacific Grove, Monterey Bay, in 1897. Professor Treadwell’s remarks on the notopodial setee render it prob- able that the species reported from Hawaiian waters‘ as A. echidna is really this species. Aphrodita japonica occurs plentifully at numerous stations scattered over the whole range of these investigations, the largest number (twelve) being taken at station 4,436. The specimens vary from 28 mm. (sta. 4,322) to 155 mm. long and 70 mm. in extreme width between tips of neuropodial spines (sta. 4,457). The sets and other characters agree exactly with the northern examples. The neuropodials increase in number with age and the densely hairy tips of the young become worn quite smooth on old specimens. A characteristic of the species —distinguishing it from related species with elongated hooked noto- podial setee—is the slender, rather long, tapered median tentacular style. This character, however, must be used with caution as the style is sometimes lost or broken and in this condition may resemble the short, clavate tentacles of other species. Marenzeller gives a good figure. The lateral fringes are dull reddish but detached tufts of the dorsal felt often exhibit a dull green color. Stations 4,322, off Point La Jolla, vicinity of San Diego, 110-199 fathoms, green mud and shells; 4,325, same locality, 191-292 fathoms, green mud and fine sand; 4,334, off Point Loma Light, vicinity of 3 Proc. Acad. Nat. Sci., 1908, p. 338. * Bull. U. S. Bureau of Fisheries, 1903, p. 1,157. 376 PROCEEDINGS OF THE ACADEMY OF [April, San Diego, 525-541 fathoms, green mud and fine sand; 4,335, same locality and bottom, 500-530 fathoms; 4,353, same region, 628-640 fathoms, green mud; 4,354, same locality and bottom, 646-650 fathoms; 4,358, same region, 167-191 fathoms, green mud; 4,432 and 4,433, off Santa Rosa Island, 243-272 fathoms, green mud; 4,435: and 4,436, off San Minguel Island, 264-287 fathoms, green mud; 4,452, off Pomt Pinos Light, Monterey Bay, 49-50 fathoms, green mud and fine sand; 4,457, same locality, 40-46 fathoms, dark green mud; 4,464, same region, 51-36 fathoms, soft, dark gray mud; 4,482, off Santa Cruz Light, Monterey Bay, 43-44 fathoms, soft green mud; 4,522, off Point Pinos Light, Monterey Bay, 130-149 fathoms, gray sand and shells. With the exception of the last, at which a single specimen was taken, the bottom at all of these stations was muddy. Most of the specimens are thickly covered with foreign matter and stained deep brown or black. Aphrodita refulgida sp. nov. Pl. XXXII, figs. 76-84. A species of the japonica-hamata group, so far as known of moderate size and of smooth, neat appearance. Easily distinguished from A. castanea by the brilliant green lateral fibers, the attenuated ends of the neurosetze and the much less conspicuous notosetze. Form more broadly ovate than A. castanea, only moderately depressed and with regularly arched dorsum, caudal end attenuate. Length of type 36 mm.; maximum width (XV) of body 10.5 mm., between tips of parapodia 18 mm., between tips of neuropodial sete 24 mm.; total width including lateral fibers when floating in water 29 mm.; maximum depth 11.5 mm. Number of segments 42, the last twelve very small and forming a narrow caudal region concealed by the sete. Cotypes 23 and 35 mm. long with 40 and 43 segments respectively. Prostomium (PI. XX NII, fig. 78) subelliptical, nearly twice as wide as long, smooth and strongly convex dorsally, the sides and front regu- larly rounded, the posterior border truncate and nearly straight and united to the short peristomium by a broad, convex median nuchal isthmus about one-fourth the width of the prostomium, on each side of which is a deep transverse furrow. Ocular peduncles hemispherical prominences nearly in contact and projecting over the anterior face, each bears two minute black eyes, one dorsal and one ventral. Median tentacle arises from anterior face beneath ocular peduncles, about as long as prostomium, consisting of a short cylindrical ceratophore and a slender tapered style about three times as long as the ceratophore, its distal half colored yellow and terminal bulb minute. Palpi white, » s 1910.] » NATURAL SCIENCES OF PHILADELPHIA. O17 the very short basal segment more than one-half the width of prosto- mium, the rest regularly tapered, only moderately slender, about seven times as long as the prostomium, with slender pointed tips and bearing minute sensory cilia. Facial caruncle a rather prominent, nearly smooth plate, very thin and strongly compressed between the bases of the palpi but somewhat swollen above, terminating above mouth in a short blunt papilla. In all the specimens this papilla is much shorter than on most. species. Peristomium a short transverse dorsal fold united to the prostomium by the nuchal isthmus and forming the anterior lips ventrally. Peristo- mial parapodia (Pl. XXXII, fig. 78) much prolonged forward, reaching beyond the prostomium fully twice its length, much compressed to near the end which is expanded but not divided into rami; distal end re- ceiving a dorsal aciculum only and bearing three dense flat tufts of capillary sete, one above the notocirrus, one above and distal to the neurocirrus and the third ventral and much more proximal. Tentacular cirri borne on distal end of medial face of peristomial parapodia. Both consist of short ceratophores and slender tapered styles about one-fifth as long as the palps and with scarcely developed terminal bulb. Mouth bounded by peristomium and posteriorly by a long quadrate lip that occupies the entire middle region of somites Il and III and cuts into IV. Anus a small dorsal slit with furrowed rim cutting through the last 4 segments. Metastomial segments flat below, the boundary between segments and parapodia clearly defined by a deep continuous trench. Segments indicated by thick and deep transverse integumental folds; neural area not. sharply differentiated from muscular area. Cuticle thick and opake on the venter, studded with spherical papillze, much smaller and less crowded than on A. castanea, dorsally thinner and on the body smooth with few and scattered minute conical, capped papille (Pl. XXXII, fig. 76) which become much more numerous on the bases of the parapodia. Elytra fifteen pairs, borne on II, IV, V and alternate segments to XXIII and then somewhat doubtfully on XXV, XXVIII and XXNI, following which are eleven small sezments tapering to the minute pygidium. Elytra all large, widely imbricated and completely cover- ing dorsum of body and head; they are thin, flexible and tough, having the same form and mode of attachment as in A. castanea. The last pair folded into a tube enclosing the caudal segments. Dorsal fimbriated organs begin on VI and alternate with the elyira to NNN, the last two pairs being rudimentary. The others are erect, compressed 378 PROCEEDINGS OF THE ACADEMY OF [April, and hatchet-shaped with the crest-like border divided into six to eight short, blunt processes sometimes flattened or even bifid (Pl. XXXII, fie at): Parapodia prominent, the neuropodia of typical segments about one-third width of segments, pointing straight laterad, stout, conical, little tapered, truncate distally and stepped for the usual three series of sete. Intezgument much wrinkled and studded on the sides and venter with spherical papillae much more widely separated than those of A. castanea and smaller than those of A. armifera, but larger and more crowded at the bases of the sete. The aciculum projects slightly from the dorsal step of the foot. _Notopodium a low nub extended to the dorsal surface. Neurocirrus arises postero-ventrally from a low fold or ridge in place of a distinct ceratophore near middle of neuro- podium; style acuminate, rather stout in basal half, slender and tapered distally and terminated by a scarcely evident knob, smooth, not quite reaching base of middle series of set. Notocirri spring from stout cirrophores behind the lateral tuft of notopodial spines; styles slender throughout and little tapered, a slight subterminal and a scarcely evident terminal enlargement. They perforate the felt and rise above it along with the lateral tufts of notopodial spines. Anteriorly the parapodia are gradually reduced in size and directed more and more forward, the first or peristomial being alluded to above. Neurocirrus of II somewhat longer than the others and arising nearer to the base of the foot which approximates the form of the first. Posteriorly the parapodia become very small but slender and elongated with the notopodium as well as the neuropodium projecting freely. They bend ventrad and toward the middle, converting the venter of this region into a groove closed posteriorly. The neurocirri become relatively longer and the subterminal and terminal enlargements are exaggerated. Dorsal felt an even, regular and near smooth investature covered with a coating of mucous, silt and foreign particles of various kinds. It is unusually thick and composed of very fine fibers arranged in two layers, the inner thin, membrane-like and clean, the outer much thicker and carrying much foreign matter. Penetrating its lateral parts along the sides of the worm are the stout, brown, notopodial setz in two series and below these the beautiful flowing plumes—unusually long and abundant—of iridescent setee which glow with a fine golden- green or in some lights, a blue-green metalic luster. Many of these fibers curve upwards onto the felt, the fibers of which also are slightly iridescent when clean. }910.} “ NATURAL SCIENCES OF PHILADELPHIA. 379 Neuropodial sete mostly concealed above by the felt, arranged in the usual three series, the dorsal being stout and deep brown and two or sometimes three in number, the middle paler, about half as thick and four or five, the ventral yellowish brown and much more slender and more numerous, ten being almost invariably present on middle segments. As compared with most similar species sete of all three series are long and slender and shaped more nearly like those of A. hamata than any other species. All are nearly straight—those of the ventral series (Pl. XX-XIL, fig. 81¢) most curved—perfectly smooth with no trace of hairyness or tuberculation and with a slight subter- minal enlargement tapering to a slender acuminate tip, the last two characters also much more accentuated on the ventral sete (figs. Sla—c). Notopodium bearing two series of large setee (Pl. XXXII, figs. 79 and 80) the ventralmost or lateral arranged in a nearly vertical series of six to eight which pass through the felt and then bend sharply dorsad with their slender ends resting upon it. The dorsalmost group is irregular and usually consists of six to eight setze more or less dis- tinctly in two short rows which penetrate the felt obliquely and rest upon it more or less concealed in the covering silt. All of these sets are dull brown, soft of texture, longitudinally striated, quite without surface asperities, stout and flat at the base and tapered to slender ends with hooked tips. The apical sheaths sometimes present are unusually long and are free of hairyness (fig. 80). Seta of the ventral series are shorter and more abruptly tapered, the dorsal more gently tapered and reaching beyond the middle of the body, increasing in length from before backward. The capillary fibers have the usual arrangement into dorsal, intermediate and ventral tufts. The former are confined to elytrophorous segments and are very abundant, forming, with the intermediate tuft, the dorsal felt, the individual fibers being very long and slender with hooked tips. The ventral tuft forms the iridescent plumes and the fibers are short, coarser, somewhat rigid, tapered to very fine straight points and are very smooth so that no foreign matter adheres to them. Toward the head the arrangement of the notopodial setsze becomes simplified by the merging of the two groups of notopodial sete and two groups of fibers. Neuropodial setee become longer and more slender and on III and II, the ventral series is replaced by a dense patch of deli- cate bipinnate sete (Pl. XX XII, fig. $2). In this group the dorsalmost sete are longest and coarsest and bear a short pennant-like tip. Pass- ing toward the ventral side this tip increases in size at the expense of the remainder of the setze and becomes spirally turned until on the \e 3580 PROCEEDINGS OF THE ACADEMY OF [April, smaller ventral setee nearly the entire toothed portion consists of a spiral of four to five and one-half turns. On I all sete are smooth fiber-like capillaries. Toward the caudal end, the neuropodial spines become more and more slender and acquire rather conspicuous spur- like teeth, at first few and irregularly arranged and finally in two regular series, extending for a long distance on the very slender and much elongated sete (figs. 83 and 84). Notopodial spines become more slender and lateral fibers coarser and in brush-hke tufts. No natural color exists on the body but some parts are stained with a yellowish incrustation. Numerous external parasites are attached to the integuments of both dorsal and ventral surfaces. Stations 4,457, Monterey Bay, off Point Pinos Light, 40-46 fathoms, dark green mud (2 cotypes); 4,464, same region, 36-51 fathoms, soft gray mud (type). Aphrodita castanea sp. nov. Pl. XXXII, figs. 85-97; Pl. XX XIII, fig. 98. A species of the A. japonica group; narrowly ovate, tapered toward both ends but the posterior much more slender and attenuated, strongly depressed with a nearly flat dorsum and flat, sole-like venter; espe- cially remarkable for the serried rows of numerous rich chestnut- colored notopodial sets which cover the sides nearly completely. The type is 48 mm. long; maximum width of body (at XIV) 14.5 mm., between ends of parapodia 22 mm., between tips of sete 31.5 mm.; depth 10.5 mm. number of segments 43. Prostomium (Pl. XXXII, fig. 85) subglobate, nearly circular in outline or slightly wider than long, slightly depressed, strongly convex above, the ocular elevations prominent and hemispherical, in the position of the prostomium of most of these specimens very little projecting beyond the anterior margin, or even entirely dorsal so that both pairs of eyes are visible from above. Eyes two pairs, minute, black, one above or behind the other according to the degree of elevation of the prostomium. Nuchal fold a sharply defined isthmus about one- fourth as wide as the prostomium and sloping downward to the transverse peristomial fold. Median tentacle arising from the frontal face below the ocular peduncles, its ceratophore short, obconical and about one-fourth to one-fifth the prostomial length, the style (about 15 examined) scarcely longer than ceratophore, strongly clavate, bent into a V-shaped hook. Palpi with rather swollen bases, somewhat obscurely separated as ceratophores; styles four to six and one-half times the length of the prostomium, moderately slender, regularly tapered to acute tips, the cuticle smooth and polished, bearing numerous delicate pointed cilia. Facial ridge very prominent, nearly as long as 1910.] - NATURAL SCIENCES OF PHILADELPHIA. 381 the prostomium, the dorsal border somewhat inflated above the palpi, the remainder compressed and terminating in front of mouth in a slender, pendant, finger-like process studded with numerous pediculate globular papille. Peristomium forming a narrow transverse fold above connected with the nuchal fold, below a rugous lip. Its parapodia (Pl. XXXII, fig. 85) strongly compressed and prolonged straight forward, more than half its length beyond the prostomium, the distal end slightly expanded and bearing three rather small tufts of capillary sete. Tentacular err with short, rather stout cirriphores arising from the dorsum and venter of the expanded distal end, the dorsal directed somewhat upward, the ventral chiefly outward; styles moderately slender, tapered, without distinct subterminal or terminal bulbs and without cilia. Mouth a small opening bounded by furrowed lips, the posterior lip a broad plate occupying the entire ventral area of II and III and cutting somewhat into IV. Metastomial segments forming a flat ventral surface fairly well separated from the parapodia by a lateral furrow and differentiated by shallow transverse furrows. To the twenty-ninth the body is nearly equally curved and tapered anteriorly and posteriorly; posterior to this the caudal region is slender and attenuated. Ventral integu- ment thick and opake, so that the neural area, though constituting about two-fifths of the width, is not clearly defined from the muscular as In some species. Venter so thickly studded with spherical tubercles that in many places they touch over large areas, especially on the parapodia. On the dorsum the integument is thinner and translucent and is rather sparsely studded with small bluntly-conical papillee (Pl. XXXII, fig. 87). Anus a short dorsal slit extending through the | last four segments. Elytra fifteen pairs, on II, IV, V, VII and alternate segments to XXIII, XXVI, XXIX and XXXII, strongly imbricated, in general nearly circular with a slight lateral notch from which the broad linear attachment extends to the center. Posterior ones elongated with anterior attachment, the last about twice as long as wide and folded with its fellow into a tube reaching somewhat beyond the pygidium. In texture they are somewhat firmer and thicker than on the other species here noticed. Dorsal fimbriated organs begin on VI and occur on all cirriferous somites to and including XXXI. The first is small and the last two rudimentary. On middle segments they are unusually large. They are of lappet-like form, produced freely on the medial side. Free 382 PROCEEDINGS OF THE ACADEMY OF [April, | border bearing six or seven lobes most of which are again divided into two or three finger-like papillae each with a terminal sense organ (Pl. XXXII, fig. 86). Parapodia of the usual form, the neuropodia shorter and stouter than in A. refulgida, terminating in the usual three step-like folds, and on the ventral face thickly crowded with’short pediceled globular papille, the largest of which occur at the bases of the setae. Neuro- cirri arise at about middle of ventral face of neuropodia and reach bases of middle series of sete. They are ‘slender, especially in the distal half, and end in slightly bulbous tips. No sensory cilia on style but a close cluster of somewhat enlarged spherical papillee round the base. Notocirri project through the felt at the ventral border of each lateral tuft of notopodial setze and curve freely dorsad and caudad to a point about opposite the middle of the next succeeding homologous tuft. They arise from large ceratophores and the styles are slender with scarcely obvious subterminal enlargement or ter- minal bulb and no sensory cilia. Notopodium a scarcely elevated tuberosity receiving the end of a stout aciculum. Toward the ends both rami become more prolonged, the neuropodium slender and the notopodium compressed and somewhat spade-shaped. Peristomial parapodium much prolonged forward and the rami united to the end, the notopodium only retaming an aciculum and the sete though differentiated into fascicles being all of one kind. Neurocirrus of II about twice as long as the others. Cirri of the much crowded caudal parapodia, which approach each other ventrad, have exaggerated subterminal and terminal thickenings and the notocirri are relatively longer, neurocirri shorter than on middle segments. Dorsal felt covering somewhat thinner than on A. refulgida and not distinctly differentiated into two layers, but continuous and of uniform thickness; formed of a close web of fine dull gray fibers and coated externally with silt. As noted above the notopodial sete are very conspicuous and the neuropodial spines are freely exposed and project prominently at the sides. Neuropodial sets in the usual three series, medium sized specimens like the type having commonly two in the dorsal, three or four in the middle and six to eight in the ventral series. All are dark brown, the dorsal ones being especially deep and exhibiting the most splendid bronzy reflections. Dorsal sete (PI. XXNII, fig. 92a) are nearly straight and retain but little hairyness. Ventral ones (Pl. XXXII, fig. 92c, and Pl. XX XIII, fig. 98) are about one-fourth diameter of the dorsal, more curved, with distinctly enlarged and densely pilose ends on which the hairs form a dense cushiony 1910. ] “ NATURAL SCIENCES OF PHILADELPHIA. 383 brush often agglutinated into a kind of spur, in addition to which a hirsute sheath may be present. Sets of the middle series (fig. 92b) are intermediate in character. Anteriorly on II and III the ventral series is replaced by a dense tuft of several rows of small pin- nate sete (Pl. XXXII, fig. 93) the longer dorsalmost of which have the tips simply prolonged while on the ventral ones they become spirally twisted, and increase in length at the expense of the strictly pinnate region until the most ventral consist chiefly of a spiral of two to two and one-half turns. Posteriorly all neuropodial setz become slender, elongated and more or less spinous, the spines appear- ing at first irregularly and in a restricted region and becoming more regularly biserial and more widely distributed as the seta become longer and more slender (figs. 94 and 95). Notopodial sete in the usual two fascicles; the ventral a vertical series of fourteen to eighteen, visible above the felt on the medium- sized type and cotypes (37-48 mm. long); dorsal fascicle arising in two short parallel oblique series of six to eight each, or on elytro- phorous segments sometimes in one series of about fifteen. In each group they increase in size from below dorsally and one or two minute ones may be concealed beneath the felt. Those of the ventral series are bent rather abruptly caudad on to the felt and give an aspect of a series of waves. At the base they are flattened and very stout and taper rather rapidly into the slender ends. Otherwise they are like those of the dorsal fascicle. Sete of the dorsal fascicle penetrate the felt more obliquely, those on elytrophorous segments at a more dorsal level than the others, and are consequently more recumbent on the felt. They curve rather gently dorsad and at the same time taper very gradually into the long slender ends which cross those of the opposite side and on posterior segments often reach the opposite side of the body. All of those setze have a chestnut or pale brown color, are soft, flexible and friable, stout and compressed at the base and taper more or less gently to the tip which is rather abruptly contracted into a hard, pointed, strongly bent hook (Pl. XXXII. fig. 88). They are finely striated longitudinally and the surface of the convex side bears numerous small hard asperities (fig. 89). Pos- teriorly they become more slender and anteriorly much shorter, the former finally terminating in a more open hook and like the lateral felt fibers becoming covered with sticky hairs (PI. XXXII, fig. 96). Felt fibers arise in dense tufts immediately above the dorsal notopodial setee on scale-bearing segments only and spread horizontally in a tangled layer. A smaller tuft arises between 384 PROCEEDINGS OF THE ACADEMY OF [April, the two fascicles of sete on all segments. The fibers are nearly or quite colorless, smooth, very fine, long and of nearly uniform diameter but taper to abruptly hooked tips (fig. 90). Lateral tufts of fibers. arising below the notopodial sete are rather sparse, not much longer than the neuropodial setaee and hang down between the parapodia. They are much coarser than the felt fibers, especially at the base from which they taper to fine straight tips (fig. 91). They are arranged in regular rows like the large setee. Usually they are very heavily coated with silt but when this is cleaned off they exhibit none of the brilliance of color of many species and scarcely a trace of iridescence. The somewhat roughened surface is covered with a fine hairiness which many result from a mucous coat or the separation of the more super- ficial constituent fibers (fig. 97). In any case this feature seems to insure the adhesion of silt. No color other than the extraneous ferruginous incrustation. One specimen dissected contained strings of large ova. None has the proboscis protruded. Stations in Monterey Bay, 4,446, off Point Pinos Light-house, 52-59 fathoms, green mud; 4,457, same locality, 40-46 fathoms, dark green mud; 4,464, same locality, 36-51 fathoms, soft dark gray mud; 4,467, off Santa Cruz Light-house, 51-54 fathoms, soft dark green mud (cotypes); 4,468, same locality, 51-309 fathoms, fine sand (cotypes) ; 4,481, same locality, 45-50 fathoms, hard sand; 4,482, same locality, 43-44 fathoms, soft green mud (type and cotypes) ; 4,485, same locality, 39-108 fathoms, soft green mud and sand; 4,550, off Point Pinos Light-house, 50-57 fathoms, green mud and rocks. This plainly colored but handsome and very interesting species is confined, so far as known, to the waters of Monterey Bay where it appears to be quite plentiful, the collection yielding twenty-six specimens. With the exception of one doubtful record of depth (51-309 fathoms at station 4,467) it was taken practically exclusively at depths varying little from fifty fathoms and chiefly on muddy bottoms, though a few occurred on sand. Though resembling A. japonica, A. negligens and A. refulgida in many respects and especially in the long, soft, hooked notopodial sete, this species is easily distinguished from all of them by the large number and rich chestnut color of these sete, and in addition from A. japonica by having a short and clavate, tentacular style instead of an elongated tapered one, and from A. refulgida by having densely hairy instead of smooth neuropodial sete and instead of brilliant. 1910.] ‘ NATURAL SCIENCES OF PHILADELPHIA. 385 lateral fringes only tufts of short brownish hair. < 24. Fig. 58—End of a dorsal neuropodial seta, * 250. Polynoe(?) renotubulata—figs. 59-64. Fig. 59—Head lacking some of the appendages, X 9. Fig. 60—Posterior aspect of parapodium from behind middle of body, without sete, and showing the greatly elongated nephridial papilla (n), SS Sh Fig. 61—First elytron, X< 9. Fig. 62—Average neuropodial seta from XXIII, < 33. Fig. 63—End of the same, X 250. Figs. 64a and 64b—Side and face views respectively of end of a ventral neuropodial from XXIII, < 250. A phrodita armifera—figs. 65, 66. Fig. 65—Dorsal finbriated organ from XII, x 56. Fig. 66—Two dorsal papille, puzzling a long time over the many specimens of Nepthhys in this collection, I have been unable to come to any satisfactory conclu- sion regarding the number of species actually represented, and have, therefore, tentatively begged the question and followed Wiren in listing all of the forms represented under the above name. As a matter of fact, scarcely a single specimen can be confidently said to be typical N. ceca, though a number differ from it only intangibly. Most of them, in having the neuropodial postsetal lip much larger than the corresponding part of the notopodium, resemble NV. hombergi Aud. and M. E. (= N. assimilis Oersted, Malmgren). Here belong especially those from stations 4,443, 4,462, 4,482, 4,485, 4,510, 4,525 and 4,548, all in Monterey Bay. One lot (station 4,436), in the almost total absence of parapodial lamelle, approaches very closely N. ciliata (Miiller) Rathke and has the rami widely separated as in N. incisa Malmgren but all of them have more segments than the latter. Specimens from stations 4,306 and 4,549 also approach this type, but the lamella are better developed. Two small specimens (station 4,482) have the long sete and long involute gills of N. malmgreni Theel ( = N. longisetosa Malmgren non Oersted). Examples from many of the other stations present intermediate characters, and it is for this reason that I do not here separate the forms as I have done previously, though I am by no means convinced that more than one species may not be represented. . The specimens vary in size from little more than 1 mm. wide to 8 and 9 mm. wide, the largest invariably incomplete. Many of the smaller ones show a conspicuous color pattern in the form of an irregular brown or dusky spot on the prostomium and bars of the same color across many of the anterior segments. e 244 PROCEEDINGS OF THE ACADEMY OF [April, Stations 4,306, off Point Loma Lighthouse, vicinity of San Diego, 207-497 fathoms, green mud, fine sand and gravel; 4,310, same locality, 71-75 fathoms, green mud and fine sand; 4,349, same locality, 81-134 fathoms, green mud and fine sand; 4,364, same locality, 101-129 fathoms, gray sand, mud and rock; 4,431, off Santa Rosa Island, 38-45 fathoms, varied bottom; 4,436 off San Miguel Island, 264-271 fathoms, green mud; 4,443, off Point Pinos Lighthouse, Monterey Bay, 32-37 fathoms, fine gray sand; 4,462, same locality, 161-265 fathoms, green mud; 4,464, same locality, 36-51 fathoms, soft dark gray mud; 4,475, same locality, 58-85 fathoms, soft green mud; 4,480, off Santa Cruz Lighthouse, 53-76 fathoms, dark green mud, sand; 4,482, same locality, 43-44 fathoms, soft green mud; 4,485, same locality, 39-108 fathoms, soft green mud, sand; 4,510, off Point Pinos Lighthouse, 91-156 fathoms, gray mud; 4,522, same locality, 130-149 fathoms, gray sand and shells; 4,523, same locality, 75-108 fathoms, soft dark mud; 4,526, same locality, 204-239 fathoms, soft gray mud; 4,538, same locality, 795-871 fathoms, hard gray sand; 4,548, same locality, 46-54 fathoms, coarse sand, shells and rock; aden A 4,549, same locality and bottom, 56-57 fathoms. NEREID A. The Nereide are represented less richly than in similar collections along the more northern shores of the Pacific side of North America. The absence of any of the large species of Alitia is especially note- worthy. Nereis procera Ehlers. Pl. XV, fig. 18. IN eRe goer Ehlers, Die Borstenwiirmer, 1868, pp. 557-559; Taf. XXIII, g&. a. Represented by a number of small specimens, 21 to 45 mm. long, in the atokous phase and all sexually immature, which agree closely with Ehlers’ description and also with larger mature examples already reported in these PRocrEepiNes for 1909 from the littoral zone at San Diego and Monterey Bay. The jaws and paragnaths conform gen- erally to Ehlers’ description, but group V may be absent or represented by either one or two paragnaths and the band VII-VIII varies much in width. The number of segments varies from 60 to 75. The sete, studied on one specimen, are disposed as follows: On anterior parapodia the notopodium bears six or eight homogomphs with slender “‘fish-bone” appendages, the neuropodial supra-acicular fascicle contains four or five similar homogomphs and usually two stout heterogomphs with short, scarcely faleate appendages, and the 1911.] “ NATURAL SCIENCES OF PHILADELPHIA. 245 neuropodial subacicular fascicle two or three homogomphs and five or six heterogomphs like the above, together with a few heterogomphs with longer appendages. On middle segments the number of homo- gomphs increases, but the heterogomphs become stouter and fewer. By about XXXIX the slender notopodials are replaced by two stout homogomphs with short, stout, fusiform, nearly buried appendages. A specimen from station 4,425 has the parapodia longer with more pointed linguke than usual and the characteristic notopodial sete apparently wanting, but in all other respects, including the paragnaths, is typical. Several from station 4,496 have the color pattern well-preserved. The anterior end is ashy, marked with brown spots and streaks gradually fading out and disappearing at about XVIII, beyond which the cuticle exhibits a conspicuous iridescence on a pigmentless integument. A large triangular spot (formed of a central and two lateral lines) occupies nearly the entire dorsum of the prostomium with its base resting on the eyes. The segments are marked by a central transverse dash, a pair of paramedian dashes near the anterior end, a similar pair near the posterior end, and a pair of lateral spots. On the first few segments the anterior and posterior pairs of spots tend to unite into two lines. Of greater interest are five male specimens in the epitokous phase, hitherto unknown, taken at station 4,355. All are small, varying from 17 mm. and 54 segments to 28 mm. and 67 segments. In the latter the anterior region is 10.6 mm. long. In all cases the anterior region has 14 setigerous segments besides the apodous peristomium. Prostomium of the general form seen in the atokous phase, but rather shorter and more broadly rounded anteriorly and strongly bent ventrad so that the anterior eyes lie rather more than half beneath the posterior. Eyes of each side coalesced, but not especially enlarged, each being little more than one-fourth the prostomial width. Both have large lenses, the ventral looking ventrad and laterad, the dorsal dorsad and laterad. Tentacles about three-fourths as long as prosto- mium, but ventrad and regularly tapered. Palps directed ventrad, short, scarcely more than one-half length of prostomium, basal seg- ment stout, distal minute. Peristomium obscurely biannulate with a narrow, feebly separated anterior ring. Tentacular cirri all short, rather distinctly but irregu- larly articulated; posterior dorsal reaches to V, anterior dorsal to beyond middle of III, and the two very short ventral cirri scarcely beyond the anterior border of If. On the largest specimen, which has the anterior segments more extended, the cirri are relatively shorter. * 246 PROCEEDINGS OF THE ACADEMY OF [April, Pygidium minute, top-shaped, bearing a pair of rudimentary para- podia, two pairs of short ventral subanal cirri and a whorl of slender papille. Parapodia of anterior region similar in general characters and sete to atokous type of corresponding segments. Notopodia of first seven with basal half much enlarged, the distal portion remaining filiform, but not strongly bent. Neurocirri of first five setigerous segments also thickened at the base. All remaining parapodia are modified to the natatorial type, there being no caudal region, but the serrated notocirri continue to about XLV only, behind which they are smooth. The form of the complex lamelle and lingule is best understood by reference to figure 18 (Pl. XV). All setee are of the usual natatorial type and none of the peculiar sete so characteristic of the middle notopodia of atokous individuals are present. One specimen has the proboscis protruded and exhibits the para- enaths and jaws in characteristic arrangement. Stations 4,355, San Diego Harbor, surface; 4,405, off San Clemente Island, 654-704 fathoms, green mud; 4,415, off Santa Barbara Island, 302-638 fathoms, green mud; 4,417, off Santa Barbara Island, 29 fathoms, fine yellow sand and rock; 4,420, off San Nicolas Island, 32-33 fathoms, fine gray sand; 4,421, same locality, 229-298 fathoms, gray mud and rock; 4,425, same locality, 1,100-1,084 fathoms, green mud, fine sand and Globigerina; 4,427, off Santa Cruz Island, 447-510 fathoms, black mud and rock; 4,431, off Santa Rosa Island, 38-41 fathoms, varied bottom; 4,496, off Santa Cruz Lighthouse, Monterey Bay, 10 fathoms, fine gray sand and rock; 4,531, off Point Pinos Lighthouse, 26-28 fathoms, fine gray sand, rock. Nereis paucidentata Moore. Nereis paucidentata Moore, Proc. Acad. Nat. Sci. Phila., 1903, pp. 430, 431, Pl. XXIV, figs. 28-30. A single small imperfect specimen from station4,397, Lat.33°10’15’N. Long. 121° 42’ 15” W., 2,196 fathoms, gray mud. This is the first record of this species south of the Gulf of Georgia and the bathymetrical range is even more extended from 270 fathoms. The species is not uncommon in Alaskan waters. Nereis cyclurus Harrington. Nereis cyclurus Harrington, Trans. N. Y. Acad. Sci., XVI, 1897, p. 214. Two fine specimens showing faintly the annular bands of color. “Commensal in Natica shell with hermit crab.” Station 4,560, off Santa Cruz Lighthouse, Monterey Bay, 10-12 fathoms, fine gray sand and rock. 19]1.] NATURAL SCIENCES OF PHILADELPHIA. 247 Platynereis agassizi (Ehlers). Pl. XV, fig. 19. Nereis agassizi Ehlers, Die Borstenwiirmer, 1868, pp. 542-546, Taf. XXIII figs cL. Besides several atokous individuals, two of which (station 4,559) contain eggs, a large number of sexually mature epitokous examples were taken at station 4,355 by means of a surface electric light and dip-nets. Of the latter 83 were males and only 5 females. As the latter have never been described, a brief description is here added. In general appearance they agree closely with the males, but average somewhat larger, from 21 to 33 mm. long. The two regions of the body of the two extremes measure, respectively, 5 and 16mm. and 11 and 22 mm. long, and the segments number from 93 (28 + 65) to 151 (28 + 103), the anterior region of the female comprising, therefore, seven more segments than that of the male, which has 21. One temale has only 27. The color is generally pale and faded, but shows indications of transverse brown lines and posteriorly more distinct transverse rows of spots. Some of the specimens exhibit the same yellow color an- teriorly as shown by the males, but usually much paler. Prostomium almost exactly as in the males, the eyes, coalesced on each side, scarcely perceptibly smaller, the palps and tentacles turned almost as markedly ventrad. Peristomial cirri, so far as preserved, have the same proportions as in the males and, also, as in the males, are easily detached, so that many of them are wanting. One specimen, however, in which all are present, has two dorsal cirri nearly equal, both reaching XV, and the anterior ventral reaching to VI. There is a very short caudal region of ten or twelve segments with few or no swimming sete and a short, tapering, tubular pygidium often con- stricted into two rings, quite different from that of the male in that it bears four cirriform papille in place of the whorl existing in the latter. The first’ five (on the smallest specimen four) notocirri only are thickened and the slender distal end much less abruptly hooked than on the males. First four neuropodia similar to those of the males. Parapodia and sete of anterior region also as in the males. Posterior parapodia differ from those of the males chiefly in the total absence from both notocirri and neurocirri of the sense organs which cause them to appear serrated, the cirri in the females being therefore quite smooth, simple and tapered. Most of the specimens have shed the greater part of their eggs, but one remains filled with them as far forward as the tenth setigerous somite, inclusive, and-a few have escaped into more anterior somites. > 248 PROCEEDINGS OF THE ACADEMY OF [April, They crowd the basal part of the parapodia as well as the ccelom. The character of the mature eggs is shown in figure 19, Pl. XV. Stations 4,346, off Point Loma Lighthouse, 46-50 fathoms, dark green mud and fine sand; 4,347, same locality, 55-58 fathoms, fine gray sand (both epitoke and atoke); 4,355, San Diego Harbor, surface (many epitokes); 4,420, off San Nicolas Island, 32-33 fathoms, fine gray sand; 4,422, same locality, 31-32 fathoms, gray sand and shells; 4.559, off Point Pinos Lighthouse, Monterey Bay, 8-22 fathoms, fine gray sand. EUNICID. Eunice (Eriphyle) paloloides Moore. Eunice (Eriphyle) paloloides Moore, Proc. Acad. Nat. Sci. Phila., 1909, pp 246-249, Pl. VII, figs. 5-7. A much broken and macerated female specimen containing a few eggs in the posterior region. The sexual region begins at about segment CLXXXV. The tentacles and branchiew are somewhat shorter than those of the type, but this probably results from the macerated con- dition of the specimen. In all other features studied it agrees with the type. Station 4,420, off San Nicolas Island, 32-33 fathoms, fine gray sand. Eunice multipectinata sp. nov. Pl. XV, figs. 20-23. A fine, robust species which reaches a considerable size. The type is 205 mm. long with a maximum width of body of 7.5 mm. and be- tween the sete tips of 13 mm. Number of segments 181. Other complete specimens vary from 47 mm. long, 2 mm. wide, with 87 segments to 203 mm. long and 9 mm. wide. One 195 mm. long and 7 mm. wide has 177 segments. Incomplete specimens range all the way from 1 mm. to 11 mm. in width. Prostomium in all except the smallest specimens retracted and deeply sunken into the peristomial collar to the tentacles; deeply incised and bilobed anteriorly to form the somewhat divergent, short, thick, bluntly rounded palps, slightly divided by a shallow transverse groove into a larger ventral and a smaller dorsal segment. ‘Tentacles in a crowded transverse row, each with a small indistinct ceratophore; the styles more or less strongly and irregularly annulated or distinctly articulated; on the smaller specimens the median has about seven articulations and reaches to VII, the inner paired have but five articu- lations and reach to IV or V and the outer paired four articulations and reach III. Large specimens have shorter tentacles which have evidently worn away at the tips. Eyes always large and conspicuous, situated immediately behind the outer paired tentacles 1911.] NATURAL SCIENCES OF PHILADELPHIA. 249 Peristomium very large, fully as long as the three succeeding seg- ments and forming a prominent collar, into which the prostomium is retracted, most deeply in the larger specimens; on each side a shallow notch, below which it is produced forward more prominently to form a slightly crenulated lower lip with concave border. Somite II also apodous, not exceeding one-third length of peristomium with which it is coalesced at the sides. Nuchal cirri similar to cephalic tentacles but more slender, reaching to or nearly to the cephalic border of the prostomium. Metastomial podous segments well-defined, very regular, simple, 10-14 times as wide as long anteriorly, not over 8 times as wide as long posteriorly, strongly arched above, flattened, with neural furrow below. They increase in width gradually to about XL, then taper gently caudad. Pygidium a short ring with a slight marginal thickening and bearing a pair of slender, little-tapered, stiff and smooth cirri as long as the last six segments and arising close together below the large anus. Immediately below and concealed by these is a second pair of minute and inconspicuous cirri. Parapodia (Pl. XV, fig. 20) of simple form and exhibiting the changes in position and proportions usual in the genus. Notocirri four or five, or posteriorly (where the parapodia become shortened) even more, times as long as the neuropodia, slightly tapered and smooth or very slightly wrinkled, becoming much more slender pos- teriorly. Neurocirri prominent anteriorly, with thick, swollen, ovate bases and short, thick, cylindroid styles. Farther back the basal part is gradually reduced and finally becomes minute and the style becomes first short and conical and then slender and tapered, but always considerably exceeds the neuropodium in length. Acicula all very dark brown and opake except that the tips are often pale; the neuropodial three or anteriorly sometimes two, pro- jecting from the acicular tubercle at the dorsal level of the fascicle of simple sete. They are simple, tapering rods with rather acute points on anterior parapodia and blunt, often bent or somewhat knobbed ends on posterior parapodia where they become very stout. Noto- podial acicula a fascicle of slender brown fibers passing into the base of the notocirrus in connection with a heavy mass of brown pigment. With the exception of the stout crochets which are brown, the setze are colorless or pale yellow. Three kinds occur on all segments. Simple, slender, wingless capillary setze form a small dorsal tuft in connection with the acicula. Among the bases of the capillary setz are delicate pectinate setze with slightly curved ends provided with a few indistinct 250 PROCEEDINGS OF THE ACADEMY OF [April, teeth and a marginal mucron (PI. XV, fig. 22). Most numerous are the compound sete (fig. 21) which are arranged in about six rows, are pale yellow, with curved and distally thickened shafts and short, strongly hooked, and bidentate appendages with a delicate guard finely denticulated on the margin. The last become larger caudad. Beginning at about XX VII two (sometimes one) stout crochets appear projecting prominently obliquely from the neuropodium ventral to the compound sete; they are slightly curved, with stout principal tooth and smaller more distal accessory tooth and provided with a split guard (fig. 23). Branchi strictly unilateral pectinate throughout (Pl. XV, fig. 20), consisting of a tapered main stem arising from the base of the neuro- cirrus on its dorsal side and curving gently up the sides of the body, but remaining erect, leaving the dorsum uncovered; filaments arising nearly at right angles to the stem in a close rank and lying nearly parallel, slender, the longest not exceeding two-thirds the length of the notocirrus and the main trunk, exclusive of the terminal filament into which it is prolonged, not much greater. On the type the gills begin on somite IX with seven filaments, attain the maximum of twelve filaments and retain this number, with occasionally one or two more for a great many segments, then undergo gradual reduction posteriorly, the gill on the fourth preanal segment still being trifid, With few exceptions the gills of all specimens begin on IX; the only departures being three specimens, on two of which the first on one side occurs on VIII and on another on X. The number of filaments varies greatly, increasing with the size of the specimen. The smallest example (1 mm. wide) has the first gill simple and most of the others bifid. A complete specimen, 47 mm. long and 2 mm. wide with 87 segments, bears gills on all podous segments beginning with IX, the first and the last two consisting of a single filament each and the maximum number of filaments being three. One 140 mm. long and 4 mm. wide lacks gills on the last four segments, the maximum number of filaments is seven and most of the gills caudad of the middle of the body are trifid. Another, 195 mm. long and 7 mm. wide, with 177 segments, has trifid gills on [X of one side, X of the other and attains a maximum of twelve or thirteen filaments, with the last three seg- ments abranchiate. The largest complete specimen is 203 mm. long and 9 mm. wide and bears a small gill of two filaments on one side of VIII, the maximum number of filaments being fourteen and the last gill on the fourth preanal segment. Bifid filaments occur fre- quently. 1911.] NATURAL SCIENCES OF PHILADELPHIA, 251 Jaws (described from a cotype, station 4,431) hard and firm. Man- dibles with stout, divergent, nearly black stems joined only slightly by an anterior isthmus; masticatory plates hard, white, oval, with smooth, entire anterior border. Maxillee black or nearly so. Carriers of forceps-jaws nearly as wide as long, broadly rounded behind; the forceps of the usual faleate form; II very large and stout with five large teeth and one small one on each side; III on the right side is a long narrow piece with eleven teeth diminishing in size from before backward and is paired with two pieces on the left side with four and eight teeth, respectively; IV bears a single prominent tooth on each side; V is a small toothless plate. Two other specimens dissected agree in all essentials, the teeth being generally tipped with white and the border of the mandible in one case tridentate. Color of the full-grown specimens pear! or gray with a beautiful and delicate iridescence. Two of the larger specimens have the dorsum finely mottled with brown. The smallest examples are more dis- tinctively colored: one is pale brown above with an obscure white zone on IV and V; another (the smallest) has the first three segments almost solidly orange-brown, IV and V pure opalescent white and several succeeding segments annulated with brown and white. Stations 4,312, off Point Loma Lighthouse, vicinity of San Diego, 95-135 fathoms, fine gray sand and rock; 4,373, same locality, 95-225 fathoms, green mud, sand and rock; 4,377 (Type), same locality, 127-299 fathoms, green mud and sand; 4,420, off San Nicolas Island, 32-33 fathoms, fine gray sand; 4,431, off Santa Rosa Island, 38-41 fathoms, varied bottom; 4,463, off Point Pinos Lighthouse, 285-357 fathoms, green mud; 4,532, same locality, 30 fathoms, gray sand and rock. This species is related to L. bilobata Treadwell, but is readily dis- tinguished by several characters, especially by the notably smaller number of gill filaments. The type of F. bilobata is 5.5mm. wide and the first gill (on IX) has nine filaments, the maximum reaching eighteen. A specimen of E. multipectinata of the same size has only two filaments on the first gill and a maximum of seven filaments. Other species having pectinate gills for the entire length which have been reported from the Pacific Ocean are 2. antennata Savigny, L. microprion v. Marenzeller and £. flavo-fasciata Grube. All of these have the gills beginning farther forward and differ in other respects also. i) 252 PROCEEDINGS OF THE ACADEMY OF [April, Eunice hawaiensis Treadwell? Eunice hawaiensis Treadwell, Bull. U. S. Fish Comm., XXIII (1906), Pl. III, pp. 1166, 1167, figs. 42-44. The solitary incomplete example referred to here, while differing considerably from Treadwell’s description, is certainly very closely related to, if not identical with, LZ. hawaiensis. It consists of 122 ante- rior segments having a length of 76mm. and a width without parapodia of 5.56 mm. and with them, but excluding sete, of 8.5 mm. The prostomium with its tentacles, the parapodia, sete (of which, however, Treadwell’s figure does not show a full profile view), and maxille are practically identical with those of EL. hawaiensis. The branchie, however, are fewer and much less complex than those of the type. They have the following distribution and number of filaments on the right side, the left being almost identical: 1 filament somite V, 2 filaments somite VIII, 5 on IX, 9 on X, 13 on XII, 15 on XV, 19 on XX, 15 on XXVI, 16 on XXXV, 8 on XL, 5 on XLII, 2 0n XLIII and 1 on XLIV. Where best developed, from XV to XXX, the gills are very large with numerous long, parallel filaments equalling about one-third the body width. Although closely resembling the gills of FE. hawaiensis, the stems are always gently curved, never abruptly bent. The first three consist of the main trunks only. The type of E. hawaiensis is larger, measuring 7 mm. in body width and has the gills beginning on IV with three filaments and continuing to beyond L, and when best developed possessing as many as thirty filaments. This is a greater difference than one would expect m two individuals of the same species differing no more in size than do these. The hard, white masticatory plates of the mandibles, in addition to the large lateral tooth, bear three small teeth near the median line. Eunice congesta vy. Marenzeller may be mentioned as another closely related Pacific species. Station 4,537, off Point Pinos Lighthouse, Monterey Bay, 1,062 fathoms, hard sand and mud. Marphysa conferta sp. nov. Pl. XVI, figs. 29-34. Known from a single specimen 24 mm. long and 1.9 mm. wide be- twin tips of parapodia with 57 segments and a regeneration cone of about a dozen indistinct segments. Prostomium (Pl. XVI, fig. 29) large, nearly as wide as the peris- tomium, suborbicular but bent downward so that in dorsal view it is foreshortened and appears much wider than long, depressed, with an anterior notch that is the termination of a ventral groove that slightly divides it into somewhat swollen rounded halves. Eyes one pair, 1911.] NATURAL SCIENCES OF PHILADELPHIA. 253 large, conspicuous, brown, situated close to the posterior border immediately behind the lateral tentacles. Tentacles five, arising along a slightly curved transverse line near the posterior end of the prostomium, but passing in front of the eyes laterally. All slightly fusiform, tapered to distal end and transversely wrinkled or subar- ticulated, the median about one and one-third times the length of the prostomium, the others successively somewhat shorter. Peristomium a simple, regularly cylindrical, smooth, apodous ring with a slight median ventral notch on the lip and no trace of nuchal cirri. Somite II scarcely more than one-half as long as I, but otherwise similar. The remainder of the body is terete, of nearly uniform diameter except that the posterior portion is somewhat enlarged and distended with ova. The segments become shorter to the branchial region, where they are about four and one-half times as wide as long; posterior to this the length again increases until at the posterior end they are only twice as wide as long. With the fourth (Pl. XVI, fig. 29) a small ring separates at the anterior end of each segment and increases until in the post-branchial region it forms a regular propodal annulus. Pygidium at the end of the regeneration cone a short tube bearing one cirrus about equal to one-fourth the body width and another half as long as the first. Parapodia (Pl. XVI, figs. 30, 31) strictly lateral and in the pro- branchial and branchial regions prominent and outstanding, becoming smaller in the postbranchial region, strictly uniramous, there being no trace of a notopodium. Anterior parapodia consist of a low, rounded, slightly compressed setigerous tubercle, behind which is a compressed postsetal lip at the base as deep as the setigerous lobe, while its bluntly ending dorsal part is prolonged to about twice the leneth of the base. The notocirrus arises just above the foot and is about twice its length, somewhat enlarged at the base, slender and tapering distally and marked with obscure annular furrows. The neurocirrus has a thick, swollen base broadly attached to the ventral face of the neuropodium and bearing a small papilliform distal piece which is bent more or less ventrad. Posterior to the branchial region the parapodia and all of their parts become gradually smaller. The neuropodia become low, compressed cones (fig. 31), the apex of which is formed by the acicular process, while the postsetal lip becomes low and inconspicuous. The basal part of the neurocirri is much reduced, leaving only the short, bluntly rounded cirrus which reaches to the end of the acicular process. The notocirrus while undergoing reduc- tion in size retains its characteristic form and proportions, having a 254 PROCEEDINGS OF THE ACADEMY OF [April, basal enlargement and a slender style about three times as long as the foot. Neuropodial acicula two or three simple, straight, tapered rods with the ends pale and the middle brown or black. Posteriorly there is only one of these, the distal end of which projects freely. No notopo- dial acicula. Branchie (Pl. XVI, fig. 30) remarkable for their large size and restriction to nine segments (X—XVIII inclusive). The first on X has five fully developed filaments and the number on the others varies from five to seven. Each consists of a short, stout, tapered trunk arising from the dorsal side of the base of the notocirrus and curving dorsad over the back, its distal end abruptly bent to form the last filament, parallel and nearly equal to the others, which are slender and tapered and nearly equal in length to the notocirrus with which the ventralmost is coalesced at the base. The largest meet across the dorsum. Setze of four kinds, all but the crochets colorless. Compound sets (fig. 32) form a dense subacicular fascicle of several rows, very numerous anteriorly, fewer behind. The shafts are slender, curved, with the ends enlarged, oblique and bearing a deep cleft or socket with finely serrated borders. Appendages loosely attached, tapered from the basal enlargement to the bidentate tip, remarkable for the length and wide separation of the teeth; detached front border finely denticulated or striated and continued into the delicate hood. Supra-acicular fascicle composed of a tuft of delicate simple capillary setz, some of which are prolonged as far as the end of the notocirrus and associated with these on postbranchial parapodia a few very delicate pectinate sete with 16 or 18 short mucronate teeth and one margin bearing a slender filament (fig. 33). Posterior parapodia bear a single ventral crochet of a yellow color and having the end bidentate and hooded (fig. 34). Practically colorless and lacking notable iridescence, only a slight greenish shimmer anteriorly. Jaws not dissected. The type, a female filled with ova, comes from station 4,431, off Brockway Point, Santa Rosa Island, 38-40 fathoms, coarse gray sand, yellow mud and rocks. ONUPHID. The large number of species representing this family is noteworthy, there being in the collection five species of Nothria, three of Onuphis, one of Diopatra and two of Hyalinecia—no less than eleven in all. * {911.] ~ NATURAL SCIENCES OF PHILADELPHIA. 255 Within areas of similar size and under similar conditions of collecting one usually finds not over four or five species. Three species were found each at station 4,387, in deep water off the Gulf of Santa Catalina, and 4,510, in Monterey Bay. With few exceptions, they occurred on muddy bottoms. Nothria iridescens Johnson. Nothria iridescens Johnson, Proc. Bos. Soc. Nat. Hist., X XIX, p. 408, Pl. 8, figs. 86, 87; Pl. 9, figs. 88-92. The gills of this species begin on the first parapodium. Two points in Johnson’s description require modification after a study of the large number of specimens in this collection. The biarticulate style of the posterior paired tentacles is accidental and inconstant. Similar breaks may occur on any of the styles; there may be several on one style or be asymmetrical on the two styles of a pair or, as is most usual, altogether absent. Neurocirri do not disappear on V, but remain quite prominent, though short and thick, to VII, and their thickened bases continue as glandular swellings to the middle of the body as in many other species of the genus. The posterior paired tentacles, although quite variable in length, seem always to exceed the median tentacle. The color is quite variable, but usually more or less blotched with deep purple and brightly iridescent anteriorly. A tube of average size is 190 mm. long and 5.5 mm. in diameter, the outer end being slightly larger than the inner. The larger end is composed almost entirely of a very fragile wall of fine silt nearly 2 mm. thick and lacks the tough membranous lining that extends through the remainder of the tube. This species occurs generally throughout the region covered by this report and was taken in abundance at stations 4,462, 4,485, 4,508, 4,510, 4,523, 4,525 and 4,526. Stations 4,322, Soledad Hill, Point La Jolla, vicinity of San Diego, 110-199 fathoms, soft green mud; 4,339, off Point Loma Lighthouse, vicinity of San Diego, 289-369 fathoms, green mud; 4,433, off Santa Rosa Island, 243-265 fathoms, green mud; 4,486, off San Miguel Island, 264-271 fathoms, green mud; and the following stations in Monterey Bay: 4,446, 4,457, 4,461, 4,462, 4,463, 4,464, 4,475, 4,482 4,485, 4,508, 4,510, 4,522, 4,523, 4,524, 4,525, 4,526, 5,428 at depths varying from 36 to 357 fathoms, except in the case of the last station where the depth is recorded as 766-800 fathoms. The bottoms were muddy, usually ‘“‘soft green mud,” except at station 4,463, which was rocky and yielded a single specimen, and at station 4,522, which yielded ten specimens and is recorded as of gray sand and shells, though evidently adjoining a bed of green mud (station 4,523, ete.). 256 PROCEEDINGS OF THE ACADEMY OF [April, Nothria geophiliformis Moore. Nothria geophiliformis Moore, Proc. Acad. Nat. Sci. Phila., 1903, pp. 445- 448, Pl. XXV, figs. 57-59. Gills may begin on either V or VI, usually the latter. A young speci- men has a pair of minute eye specks. The small size of this species has probably caused it to be overlooked at some stations. The anterior articulated crochets differ strikingly from those of N. pallida. Stations 4,445, off Point Pinos Lighthouse, Monterey Bay, 60-66 fathoms, green mud; 4,480, off Santa Cruz Lighthouse, Monterey Bay, 53-76 fathoms, dark green mud and sand; 4,510, off Pomt Pinos Lighthouse, 91-156, gray mud. Nothria pallida sp. nov. Pl. XV, figs. 24-28; pl. XVI, 35-37. A moderately elongated species, terete anteriorly, depressed for most of the length. The type—an incomplete specimen with the caudal end regenerating—consists of 166 segments and is 82 mm. long with a maximum body width of 4 mm. and a depth of 2.7 mm. at the end of the anterior third. A complete specimen 62 mm. long and 2.8 mm. wide has 266 segments. Another broken specimen has an aggre- gate length of 124 mm. and 290 segments. Prostomium relatively larger than in N. geophilojformis, quadrate orbicular in outline, slightly wider than long, with the greatest width at the level of the posterior paired tentacles. No distinct eyes, though several obscure dusky spots appear on the prostomium. Frontal tentacles nearly in contact at the base, arising on extreme anterior border of prostomium, divergent, cylindroid with a lateral emargination about which they are bent into a bean-like shape; about twice as long as thick and one-half as long as the prostomium. Anterior or outer paired tentacles barely reaching to III, the annulated ceratophore of thirteen rings and a short, non-annulated end, about one and one- fourth times as long as the short, smooth conical style. Posterior lateral tentacles reaching XVI or XVII, the ceratophores nearly as long as the entire anterior tentacles and composed of seventeen rings and a smooth end-piece; styles flagelliform, much more slender than ceratophores and three and one-half times as long. Median tentacle reaching to IX, similar to posterior paired tentacles, but cerataphores only half as long with nine or ten annuli. A small specimen has the styles of the anterior paired tentacles nearly equal to the ceratophores and the median and posterior paired tentacles shorter than on the type, the latter reaching to XII only. Palps situated immediately in front of mouth, separated by a narrow cleft only, thick, quadrate, and divergent, about twice the size of the frontal tentacles. tot. NATURAL SCIENCES OF PHILADELPHIA. 257 Peristomium not longer than prostomium, continuing its regular outline and widening posteriorly; deeply cleft below for mouth and bearing the wide, bilobed, hammer-shaped, posterior lip. Nuchal tentacles arising from its extreme anterior border, separated by slightly more than their length and reaching extreme anterior endo- prostomium. Anterior region of body slender and terete, the segments about as long as wide and not much wider anteriorly than posteriorly. Beyond V the segments become gradually shorter, wider and more depressed until in the middle region they are very regularly about eight times as wide as long. Farther back they become gradually narrower and less depressed without change in length till near the pygidium. Pygidium short, cylindroid, abruptly truncated, bearing two pairs of slender divergent cirri, of which the dorsal is twice the length of the ventral and one-half the body width. Parapodia (Pl. XV, figs. 24, 25, and Pl: XVI, fig. 35) exhibit the usual characteristics of the genus. The first five are widely separated and modified, but gradually become less so from before backward. The three cirriform processes (figs. 24 and 25) are present and moder- ately slender and elongated, the notocirrus the longest of the three and reaching the middle of the preceding foot in each case, the neuro- cirrus and the middle cirrus or postsetal lobe each from one-half to two-thirds as long on the different parapodia, the latter the stouter and flattened at the base. Just before and after the gills appear, the notocirrus exhibits a conspicuous constriction and distortion near the base. After the fifth parapodium the neurocirrus becomes rapidly reduced to an opake glandular ridge below the base of the parapodium which for a few segments bears at its lateral end a short blunt papilla which recedes into the ridge in the course of three or four segments. The postsetal lobe becomes reduced rapidly and completely; beginning with the sixth foot, it becomes shorter and blunt and continues to be changed until at the eleventh it becomes a small, blunt, rounded papilla lying ventral to the sets and almost replacing the here obsolete neurocirrus, but postacicular instead of preacicular. Farther back (fig. 35) it totally disappears. The notocirrus remains well-developed for the entire length, but undergoes gradual reduction in size after the appearance of the branchiz, appearing upon the largest of these as a much smaller lateral process. The neuropodium becomes rapidly shorter and simplified as in other species. Branchie (Pl. XVI, fig. 35) simple throughout, the first appearing in connection with the fourth foot (V) or more rarely with the third on IV, in the latter case being usually quite small. They appear as 258 PROCEEDINGS OF THE ACADEMY OF [April, the direct continuation of the base of the notocirrus, which they dis- place ventrally or toward the neuropodium. ‘The first is always much more slender than the notocirrus, but nearly as long. By somite X the gill is three times as long as the notocirrus, and when, on middle segments, its maximum size is reached is fully four times as long and reaches well beyond the mid-dorsal line except on one specimen, on which they are strongly contracted. All of the gills, which continue nearly to the caudal end, are coarse round filaments apparently not at all ligulate and contain two large longitudinal blood-vessels con- nected by a large number of semiannular transverse vessels. Neuropodial acicular three or four stout, tapered rods with mucro- nate tips projecting freely beyond the surface antero-ventral to the curved series of capillary setee from which they are not sharply dis- tinguished. Notopodial acicula a fascicle of a few very slender and delicate fibers passing through the notopodial base and far into the notocirrus. : Setze are of five forms, all but the yellow posterior crochets being colorless. The first five neuropodia bear a nearly complete circle enclosing the acicula, of semi-articulated, tridentate, guarded crochets (Pl. XV, fig. 26) and simple capillarly sete differing little from the acicula save only in theic longer projecting points. The latter increase in number and in size and in parapodia immediately followmg the fifth (VI) replace the crochets. In the course of ten or twelve segments they gradually disappear. All parapodia, beginning with the sixth, bear a curved fascicle dorsal to the postacicular lobe of delicate, nearly straight, capillary setze which, on anterior segments, are provided with a narrow limbus not discernible posteriorly. Among the bases of these are very delicate setze ending in gouge-shaped expansions bearing eighteen or twenty regular mucronate teeth (fig. 27). Beginning at about XVII two large and stout crochets appear ante1o-ventral to the acicular papilla; their shafts are slightly curved and distally thickened and the little projecting ends bidentate and enclosed between a pair of guards (fig. 28). Jaws described from a single dissection of a cotype (station 4,401). Mandibles (Pl. XVI, fig. 36) pale brown with pure white masticatory plates, soft, the two halves only very slightly joined by the bases of the masticatory plates, the long slender stems or carriers widely separated and of nearly equal width throughout. Masticatory plates white with a black trifid spot near the base of each, narrowly ovate quadrilateral with obscurely bidentate end. Mawille (fig. 37) rather soft, pale brown with certain very dark lines and thickenings as shown 1911.] NATURAL SCIENCES OF PHILADELPHIA. 259 in the figure. Carriers of forceps jaws (1) only slightly united, widest at the middle, their posterior ends separated and ‘pointed; forceps stout at base, the ends acute and strongly hooked. Large dentinal plates (II) stout and broad, the right with nine nearly equal stout teeth, the left with six teeth, of which the first is enlarged and separated from the others by a considerable gap. Left unpaired plate (Ila) with seven or eight teeth. Anterior pieces (il) with a narrow, curved, toothed ridge and a large flaring basal plate or wing, the left six- or seven-toothed, the right larger, with eight teeth. Small accessory jaws (LV) triangular, each bearing a single tooth. Except for a small brown*spot at the base of each notocirrus and smaller ones on the bases of the tentacles, the specimens are colorless. The anterior ten or twelve segments of every specimen are strongly bent upwards so that the head is usually quite reversed. Stations 4,352 (Type), off Point Loma Lighthouse, vicinity of San Diego Bay, 549-585 fathoms, green mud; 4,400, Lat. 32° 50’ 20” N., Long. 118° 03’ 39” W., 599-507 fathoms, green mud; 4,401, Lat. 32° 52’ 40” N., 118° 13’ 40” W., 448-468 fathoms, green mud, black sand; 4,415, off Santa Barbara Island, 302-638 fathoms, green mud. * Nothria sp.? Pl. XVI, figs. 38-40. The anterior end of a rather small Nothria 1.6 mm. wide, probably representing another undescribed species. It has much of the aspect of N. geophiliformis and the setee resemble those of that species, from all typical examples of which it differs, however, in the first appearance of the gills on VII. The cephalic tentacles are peculiar and may be abnormal. The median just equals the anterior or outer paired and its style is about two-fifths that of the posterior paired. The frontal tentacles are shorter than their diameter. All cephalic ceratophores are short and 5- or 6-annulate. No eyes. Nuchal cirri very short, only one-third or one-fourth of the distance separating them. Gills begin abruptly on VII, resemble those of N. holobranchia and in their full development reach to the opposite side. Jaws not dissected. Taken from asimple mud tube from station 4,387, Lat. 32° 32’ 40” N., Long. 118° 04’ 20” W., 1,059 fathoms, green mud. * Nothria hiatidentata sp nov. Pls. XVI, XVII, figs. 41-50. A very interesting species based on two specimens found in a jar of Hyalinecia tubicola, to which species this bears a remarkably close superficial resemblance. Indeed, in most characters except the presence of nuchal cirri this species resembles Hyalinwcia more closely than ordinary Nothrie. It is a noteworthy case of associative resem- blance. 260 PROCEEDINGS OF THE ACADEMY OF [April, The type is a complete example of 94 segments, 112 mm. long, with a maximum body width at XXV of 4.8 mm. and a depth of 4 mm. Prostomium (Pl. XVI, fig. 41) in the strongly up-bent position in which it occurs in both specimens nearly circular, the seven tentacles radiating very regularly about its margin and as usual increasing in length from before caudad. Frontal tentacles in contact medially on the extreme anterior border of the prostomium from which they are scarcely delimited, little divergent, nearly two-thirds as long as the prostomium, short ellipsoidal and slightly bilobate from a. shallow lateral furrow. Probably the styles of none of the dorsal tentacles are quite complete, the ends of all being more or less worn and ragged. The ceratophores of all are short, scarcely longer than thick and divided into three or four annuli. The styles increase in both length and diameter from before backward, the anterior paired reaching to II, the posterior paired to XII or XIII and the median to XV. Palp: large, subgloboid, slightly bilobed processes bounding the mouth in front, in contact medially and projecting ventrad and laterally beyond the sides of the prostomium. Peristomium reduced, scarcely half as long as the prostomium and not much wider. Nuchal cirri (fig. 41) arising slightly behind anterior border of peristomium in line with lateral border of base of posterior lateral tentacles, slender, tapered, not quite reaching base of one of opposite side. Posterior lip somewhat bilobed, furrowed, its antero- lateral margins continuous with mandibular cushions and not pro- jecting freely as in many species. Somite II much enlarged, more than twice as long as I and nearly twice as wide, strongly convex and rising beyond I on all sides and embracing it completely laterally. Anterior region of body stout, not slender as in many species; III and IV rapidly reduced in length, V about normal; its width about six times length. These propoitions are maintained throughout the middle region, but the width gradually decreases posteriorly until it becomes only three times the length. Dorsum very strongly arched, venter flat with neural groove. Body walls firm and muscular ante- riorly, softer with translucent walls posteriorly. Caudal end tapered rather rapidly to a short tubular pygidium with expanded rim bearing a pair of very slender subanal cirri as long as the last eleven segments and one and one-third times the greatest body width. Parapodia of anterior end much like those of Hyalinecia (Pl. XVI, figs. 42, 43). The first (fig. 41) much enlarged, most modified and strongly bent forward at sides of prostomium to the level of its anterior border, cylindroid or subconical and truncate, much and deeply fur- Lott] NATURAL SCIENCES OF PHILADELPHIA. 261 rowed, terminating in a low, rounded acicular process and two broad, flat lips, the post-acicular one being much the longer and truncate distally. The short, simple notocirrus arises about the middle of its dorsal face and barely reaches the distal end of the neuropodium. Neurocirrus arises on ventral side close to mouth andffails to reach the bases of the sete. Second parapodium (III) (fig. 42) is similar but much smaller and both the post-acicular process (middle cirrus) and notocirrus are much more slender and elongated, while the neuro- cirrus is enlarged and bluntly conical. The third foot is of more normal size and position and the notocirrus is still longer, reaching beyond the postacicular lobe. But the chief change affects the neurocirus, which is no longer truly cirriform, but merely a small, rounded, cylin- droid papille. The fourth parapodium (fig. 43) differs only in the complete suppression of the neurocirrus. After the fourth (somite V) the neuropodia are gradually reduced in size until they become low, compressed cones (fig. 44). The maximum size of the post-acicular lobe is attained at about VII or VIII, after which it undergoes gradual reduction, being still distinct at XV but obsolete at XXX. The notociurus retains its length longer, at its maximum reaching about half-way to the middle line and exhibiting but little change until after the appearance of the gills, when it becomes rapidly reduced to a slender filament about one-third as long as the gill (fig. 44). Behind IV the neurocirri become small, rounded glandular elevations which gradually become smaller and finally disappear. Gills begin on XIV, though a small prophetic papille occurs on one side of XIII of one specimen. They arise at a brown vascular knot on the dorsal side of the base of the notopodium, which, however, is not so abruptly displaced ventrad as in Nothria pallida, though, when the cirrus reaches its greatest reduction, it appears as little more than a lateral process of the gill (fig. 44). From the first they equal the notocirrus in length and seldom reach more than half-way to the middle line. They have the usual form and structure but, unlike those of N. iridescens and other species, become little flattened posteriorly. Neuropodial acicula four or five, stout, slightly curved and tapered, the simply pointed tip apparently not reaching beyond the surface on anterior parapodia. Farther back there are three with abruptly tapered, acute, curved and often bent tips exposed for a short distance. There are no evident notopodial acicula. Setze are of four kinds. Large sete on the anterior modified seg- ments mostly broken, but several that are intact (Pl. XVI, fig. 45) are simple spines with the ends worn smooth as in Hyalinecia. A 262 PROCEEDINGS OF THE ACADEMY OF [Apiil, single newly erupted smaller one on III (fig. 46) shows that they are bidentate and guarded at the tip, but apparently not articulated. Limbate sets and pectinate sete (fig. 47) begin on the second foot, on which the type specimen bears in a dorsal fascicle several of the former and one of the latter. Beginning with the fourth foot and continuing to the caudal end there are both dorsal and ventral small fascicles of limbate sete. They have rather long stems and gently sigmoid, tapered and very acute ends bearing lanceolate, bilimbate blades. They become longer posteriorly. Delicate colorless pectinate sete (Pl. XVI, fig. 47) occur among the bases of the dorsal limbate sete from III to the caudal end and, except on the first two or three parapodia, form a dense cluster. The ends appear to be funnel-form with about one-third of the circle cut out and the border striated and finely denticulated. Ventral crochets begin on V, at first single and slender, but after about XV there are two or three. Two very stout yellow ones (fig. 48) are characteristic of the middle region. These have fibrous cores and slightly curved shafts, swelling distally, then rather abruptly contracted to the small head which is terminated by two rather long processes placed at nearly a right angle to the shaft and enclosed in a pair of narrow, subtriangular guards. The terminal teeth become shorter on anterior segments. Jaws described from the cotype. Mandibles chiefly dark brown except the masticatory plates which are white with two or three very dark brown lines across the basal part (Pl. XVII, fig. 49). The two halves are very lightly united; the stems of nearly uniform width, with slightly expanded distal ends grooved to bear the masticatory plates which are elliptical with irregularly crenulated free margins. Maxille (fig. 50) massive, dark brown, hard. Carriers of forceps jaws very broad in posterior half, about one and one-fourth times length, the posterior border broadly rounded. Forceps rather long and slender, strongly hooked with acute tips. Maxilla II, left outer plate with nine teeth, of which the first is very large and widely separated from the second very small tooth by a wide bay fitting the anterior enl of the left inner plate, which bears nine regular stout teeth; right plate very large with ten large, somewhat hooked teeth. Maxille Til, narrow curved pieces, the left bearing ten, the right thirteen teeth. Maxille IV, small plates bearing a single tooth on each side. Color all faded out with the exception of small brown spots at the base of the gills. Described from two specimens (of which the cotype is filled with sperm balls) both from station 4,387, off San Diego, Lat. 32° 32’ 40” N., Long. 118° 04’ 20” W., 1.059 fathoms, green mud. a t91T | NATURAL SCIENCES OF PHILADELPHIA. 263 Onuphis parva sp. noy. Pl. XVII, figs. 51-57, and Pl. XVIII, figs. 98, 99. A small, slender species of linear form, the type measuring 36 mm. long and, exclusive of the parapodia, about .6 mm. wide, with 104 segments. A large number of specimens are of similar size and only a very few larger, the maximum being about 45 mm. long and .9 mm. wide. Sexual maturity is attained at a length of 30 mm. Prostomium longer than usual, about one and one-quarter times as long as wide, elliptical in outline. Frontal tentacles on ventro-anterior border, nearly their length apact, divergent, ovate in outline with a constricted pedicle, their length about two-fifths prostomium. Ante- rior paired tentacles on antero-lateral border, barely reaching IV; ceratophore about one-third style, 4-annulate. Posterior paired ten- tacles on dorsal face close to lateral margins and slightly in advance of middle, reaching IX or X; ceratophore slightly longer than those of anterior pair, its basal half of three distinct rings, the distal half not distinctly annulated. Median tentacle arising at almost exact center of prostomium, constantly slightly shorter than posterior paired tentacles, reaching only to VIII or middle of VII, its ceratophore similar to that of posterior pair. Eyes situated immediately caudad of base of posterior paired tentacles, usually twe minute black specks (sometimes coalesced into one) on each side. Palps rather prominent, ovate lobes on ventral face of prostomium, projecting slightly beyond its margins. Peristomium similar in size and proportions to immediately following segments, shortest above, where it is about one-half prostomium, the latter being much more extensively exposed than in most species. Nuchal cirri widely separated on extreme anterior border of peri- stomium, short conical, barely reaching to middle line or posterior border of peristomium. Somite II neither wider nor longer than suc- ceeding segments, not embracing peristomium and its parapodia, not obviously enlarged nor strongly bent forward. The first three or four podous segments differ from the others only in having the walls some- what firmer, the integuments more pigmented, in being more terete and in having the parapodia more ventral in position. Middle and posterior segments strongly depressed, with the parapodia and espe- cially the gills carried high, the parapodial area thick and glandular and the dorsal and ventral field flat and translucent. They are remarkably uniform in size, but taper gradually in the posterior half. Pygidium tubular with an obliquely truncate end having a thickened border and at the produced ventral margin a cluster of two pairs of very slender and delicate anal cirri, the dorsal about four times as long as the ventral and equal to the last seven segments. 264 PROCEEDINGS OF THE ACADEMY OF [April, Parapodia all small and little prominent, even the first, although slightly enlarged and somewhat modified as in other species, presenting none of the extreme modifications so often exhibited. The first has a low presetal and a much enlarged postsetal lip, the latter being broad and flat at the base. Both cirri arise far out and the notocirrus is tapered and reaches much beyond the end of the postsetal lobe; neurocirrus bluntly truncated and falls short of the tip of the latter. The second (Pl. XVII, fig. 51) and third differ chiefly in the shorter base, shorter and broader postsetal lobe, shorter neurocirrus and successively more dorsal position. With the fourth (fig. 52) the parapodia have about reached the dorsal position characteristic of this species and the neurocirrus has been lost in a low rounded infra- podal glandular swelling. The postsetal lobe continues to shrink, and by XV is quite inconspicuous and little longer than the presetal lip; the neuropodium becomes a broad, low, conical eminence (fig. 53) and the notocirrus, although gradually reduced in size, remains well- developed to the caudal end. Branchie begin on the fourth foot (somite V) of the type, but al- though this is the most frequent beginning small simple ones may be detected on IV or even III of some specimens; more rarely the first occurs on VI. The first gill is simple or bifilar, the former being espe- cially the case when they have the more anterior origin. The single filament (Pl. XVII, fig. 52) is erect and forms the main trunk of the gill, along the lateral side of which the secondary filaments arise on more posterior gills. The first few gills are no longer than the noto- cirri, but they increase as the latter diminish in size, the main stems often reaching to or beyond the dorsimeson. Characteristically, they are erect or semi-erect and pectinate (fig. 53) with a maximum of about seven filaments, though the number varies from five to nine according to the size of the specimen. On the type the last gill occurs on XXXVII. A cotype, on which the gills are more fully extended, has the gills arranged as follows: 3 filaments on VIII, 4 on XII, 5 on XIV, 6 on XV, 7 on XX-XXVII, 6 on XXVIII and XXIX, 5 on XXX, 4 on XXXI and XXXII, 3 on XXXIII, 2 on XXXIV, and one on XXXVI. This is about the usual distribution. Neuropodial acicula usually four, little tapered until near the end where they taper abruptly to a slender exposed mucron, the longer of which project nearly to the border of the postsetal lobe. Farther back they become fewer. Notopodial acicula delicate fibers passing far into the notocirri. Setz all colorless. Sete of first parapodium (Pl. XVII, fig. 54) 1911.] NATURAL SCIENCES OF PHILADELPHIA. 265 exclusively (except perhaps the dorsalmost) semicompound, bidentate and guarded crochets with the articulation very imperfect and the guards much prolonged and very acute. None of these sete is much enlarged and the dorsalmost is very slender and acute and may lack the hooked and bifid tip. The second and third parapodia have a few similar sete in the anterior part of the fascicles, together with a few simple acute sete in the dorsal part. On the fourth foot . all setze are of the latter type. Toward the distal end they become somewhat enlarged and minutely pilose, but not truly limbate and then taper to an acute tip. On the fourth parapodium there are only seven of these setee, four being anterior and three dorsal, the latter more slender. Simple set of this type appear on all subsequent parapodia, but after a few segments are limited to a small dorsal fascicle of two to four and gradually become more slender and elongated toward the caudal end. Pectinate setze (fig. 55) first detected on IX and present on all following segments as a small dorsal tuft of three to six. They are extremely delicate and have slightly curved asymmetrically ex- panded ends with the margin distinctly denticulated. Two large ventral crochets (fig. 56) appear on X, but become larger and more exposed farther back. They are peculiar in the length of the beak and small size of the accessory tooth and the somewhat unusual width of the guards. Toward the caudal end they become much smaller and one has the teeth reduced and the other more or less straightened out and the guards are frequently absent (fig. 57). Jaws (Pl. XVIII, figs. 98-99) pale brown or yellow, translucent, soft, and flexible. Mandibles very delicate, the carriers slender, widening very little distally, feebly united, the masticatory plate narrowly elliptical, prolonged forward, a small tooth on the medial side. Maxille (fig. 99) with acute, strongly hooked forceps jaws, the carriers about two-thirds as wide as long, each half prolonged into a slender posterior process. Maxillze II broad plates, the left outer with eight or nine teeth, the inner with seven or eight, the right with nine or ten larger teeth; III, left five or six teeth, right seven or eight teeth; IV rudimentary, edentulous. Nearly all of those examined are practically colorless, the anterior end more opake and iridescent. Some examples from station 4,454 have the cephalic appendages dark or black and conspicuous quadrate blotches of black scattered over all parts of the body both dorsally and ventrally and on parts enclosed by the tubes as well as parts exposed. Tubes generally about 45 mm. long and 2 mm. to 2.3 mm. in diameter, tapering off at one end to a thin membraneous portion. The thicker 266 PROCEEDINGS OF THE ACADEMY OF [April, portions are composed mainly of fine silt, but sometimes with a few sand grains or minute pebbles. This appears to be an abundant species, and were it not for its small size would doubtless have been collected at many more stations. It was especially abundant at stations 4,467 and 4,468, where several hundred tubes were taken, and at 4,475, where about fifty were obtained. Stations 4,445, off Point Pinos Lighthouse, Monterey Bay, 60-66 fathoms, green mud; 4,446, same locality, 52-59 fathoms, green mud (type); 4,452, 4,453, 4,454, same locality, 49-71 fathoms, green mud and sand; 4,457, same locality, 40-46 fathoms, dark green mud; 4,464, same locality, 36-51 fathoms, soft dark gray mud; 4,467, off Santa Cruz Lighthouse, Monterey Bay, 51-54 fathoms, soft dark green mud; 4,468, same locality, fine sand; 4,475, off Point Pinos Lighthouse, 58-142 fathoms, soft green mud; 4,480, off Santa Cruz Lighthouse, 53-76 fathoms, dark green mud and sand; 4,485, same locality, 89-108 fathoms, soft green mud and sand; 4,510, off Point Pinos Lighthouse, 91-184 fathoms, gray mud; 4,522, same locality, 130-149 fathoms, gray sand and shells; 4,523, same locality, 75-108 fathoms, soft dark mud. Onuphis vexillaria sp. nov. Pl. XVII, figs. 69-76. A slender, elongated and very distinct species described from a single anterior end and four other pieces which are believed to form a single specimen, complete except for the caudal end. The aggregate length is 159 mm., the width without parapodia 3 mm. and including them 4.2 mm. in the middle region; and the total number of segments 242. Prostomium small, nearly circular, with a slight posterior emargina- tion, convex, its surface largely occupied by the bases of the tentacles, which are arranged in the form of an ellipse. Frontal tentacles short, thick and ovate, about one-half length of prostomium, short peduncu- late, divergent and separated by a space exceeding their diameter. A pair of minute eye-spots at the medial side of their bases. Dorsal tentacles all with annulated ceratophores and slender smooth styles. Anterior pair reach to middle of III, the style three times the length of the ceratophore which has seven articulations. Posterior pair reaching X, the ceratophore as long as the anterior but with a smooth distal part in addition to seven articulations. Median reaching VIII with much shorter ceratophore of six annuli. Palps immediately anterior to mouth, strongly divergent, stouter and somewhat longer than frontal tentacles and divided by a shallow cross-furrow. 1911.] NATURAL SCIENCES OF PHILADELPHIA. 267 Peristomium narrow, continuing outline of prostomium in a regular dome-like curve, but separated by a well-defined dorsal furrow. It is produced somewhat forward to embrace the prostomium at the sides and dorsally slightly overlaps it as a low, somewhat convex nuchal collar. Ventrally it is cut almost to the posterior furrow by the large mouth, which is partly covered by a broad lip with laterally produced angles. Nuchal cirri slender, tapered, simple, rising high up at the level of the inner lateral tentacles from the extreme anterior margin of the prostomium and separated by one-half their length. They reach to the caudal border of II or well beyond the anterior border of the prostomium. Anterior metastomial region slender and nearly terete, the first five podous segments of nearly equal length and width, the ratio being about as two to two and one-half, the greatest width being at the anterior end where the parapodia arise. After VII the segments become gradually wider and rather abruptly shorter until by XX they are about five times as wide as long and distinctly depressed with the dorsum flattened. This depressed form continues throughout the middle and posterior region. Furrows generally rather weakly de- veloped except between the parapodia. Integuments rather soft, semitranslucent and grayish except in the subparapodial region, where there are thick, opake, whitish glandular areas; surface very smooth with highly iridescent cuticle. Pygidium unknown. Parapodia of anterior end prominent, beginning on II near the ventral level and gradually shifting dorsad until by XV they have attained nearly the dorsal level. Anterior parapodia (Pl. XVII, figs. 69 and 70) are remarkable for the great length of their parts. The first is situated at the extreme anterior end of somite II and is directed only slightly forward. Succeeding ones shift to a more caudal position and lose the forward slope until the sixth is on the middle of its segment and the third is directed straight laterad. They have a rather long pedicle bearing a notocirrus, neurocirrus and_ slender neuropodial setigerous lobe divided at the distal end into a scarcely perceptible presetal lip and a remarkably prolonged, attenuate cirri- form postsetal lip. Neurocirrus arises near the base of the ventral surface and is of similar form and nearly equal length to the postsetal cirrus. Notocirrus arises dorsally nearly opposite to the neurocirrus from a thickened notopodial pedicle, into which the acicula enter, followed by a constriction and again by a swelling tapering into a long slender style one and one-half to twice the length of the neurocirrus, and the longest exceeding the diameter of the anterior segments 268 PROCEEDINGS OF THE ACADEMY OF [April, (figs. 69 and 70). Little change takes place in the first five parapodia, but with the sixth the whole parapodium begins to diminish in size, the neurocirrus especially dwindling until by the ninth the entire style has disappeared and the base is represented only by the usual opake, somewhat swollen, whitish area ventral to the base of the foot, which becomes smaller but continues to the caudal end. The postsetal lip becomes smaller very gradually, but remains to the middle segments as a small conical process. Except that it becomes more slender and assumes the proportions of a gill filament, the notocirrus undergoes little change (fig. 71). Branchize appear on both sides of somite V (fig. 70) as a single filament as long, but much more slender than the postsetal cirrus, arising from the notopodial base in common with and on the dorsal side of the notocirrus. On succeeding segments the filament becomes long and on IX a second appears; additional ones then appearing (sym- metrically except as mentioned) up to the number of nine, as follows: three on XIII (XIV on right), four on XVI, five on XIX, six on XX, seven on XXI, eight on XXVII and nine at about XXXV._ The last number (fig. 71) continues to at least L. The largest gills on pieces from the middle of the body, the segment numbers being undetermined, bear as many as twelve filaments and the most caudal segments represented bear unifilar gills. Until they possess upward of four filaments, the gills scarcely exhibit a main stem or pinniform structure which is always obvious on the more complex gills. The main stem curves rather sharply dorsad, tapering, and bearing along its lateral side the filaments, which diminish in size to the last. On anterior segments the filaments are shorter than the notocirrus, but farther back they are longer. New ones appear to be added from the growing point at the tip of the stem. Branch blood-vessels from the main trunk enter all of the filaments. Neuropodial acicula, which on anterior parapodia are not very clearly distinguished from the setz, are from three to five in a row, rather stout, tapered gently to near the end and then abruptly into slender, very acute projecting tips, appearmg at the bases of the dorsal sete. Notopodial acicula are very long and slender fibers which enter the base of the notopodium and continue far into the cirrus (fig. 71). Perhaps they would be more correctly described as buried sete. Except the large ventral crochets, all sete are colorless or nearly so. All segments bear a small tuft of slender, acute, capillary sete dorsal to the acicula, among the bases of which are a very few much more 1911,] NATURAL SCIENCES OF PHILADELPHIA. 269 delicate and inconspicuous asymmetrical pectinate sete with one margin prolonged (fig. 73). The first five parapodia bear in the ante- rior and ventral part of the fascicle a few larger setze or hooded crochets (fig. 72) with two accessory teeth below the principal hook and the guards but little prolonged. Some of the larger ones show traces of an articulation near the end. Parapodia succeeding these have the crochets replaced by short setee with mucronate tips and narrow limb. These gradually disappear and no trace of them remains at XXV. Somewhere between this point and somite L, the exact segment undetermined, appear two stout yellow bidentate guarded crochets (fig. 74) projecting slightly and obliquely from below the acicula. The jaws are imperfectly chitinized, being soft and delicate and except at a few thickened points, pale brown. Mandibles probably abnormal, very small, the form of one half being shown in two pieces in (Pl. XVII, fig. 75). Maxille (fig. 76) have long, acute, strongly curved forceps jaws with nearly circular carriers. The two plates of II on the left side have, respectively, six and seven teeth, on the right side eight or nine teeth. Plate III of each side bears an unusually large basal wing and six small teeth; IV is small and bears a single tooth. No color remains. ‘This species is known only from the type and a small portion of the middle region of another specimen from station 4,401. Stations 4,326, Soledad Hill, Point La Jolla, vicinity San Diego; 243-280 fathoms, soft green mud; 4,401, Lat. 32° 52’ 40” N., Long. 118° 13’ 40” W., 448-468 fathoms, green mud and black sand. Onuphis nebulosa sp. nov. Pl. XVII, figs. 58-68. This species has the anterior end slender with prominently out- standing parapodia, the remainder of the body, so far as known, depressed and of very uniform width and the small gills beginning on VIII or IX. The type, consisting of the prostomium and 83 anterior segments, is 25 mm. long and has a maximum width, exclusive of the parapodia, of 1.3 mm. Prostomium about four-fifths as long as wide, elliptical with an anterior median emargination, strongly convex above. No eyes detected. Frontal tentacles ovate, about one-third longer than wide and about half as long as the prostomium, arising on the frontal border of prostomium separated by a space of one-half their diameter and bent strongly downward. Anterior paired tentacles arise from antero- lateral border immediately behind frontal tentacles; their ceratophores 270 PROCEEDINGS OF THE ACADEMY OF [April, about equal to frontal tentacles, quadri-annulate; styles two and one-half times as long as ceratophores and reaching to middle of II. Posterior paired tentacles arise on the dorsal surface opposite the middle of the prostomium and just within its lateral borders; cerato- phores similar to, those of the anterior pair; styles reach somite VII or VIII. Median tentacle behind center of prostomium, similar to posterior paired tentacles, but somewhat shorter, reaching only to VI or VII. Palps cushion-like, arising from posterior ventral surface close to mouth, diverging from median line, the broadly rounded ends projecting beyond the sides of the prostomium. Peristomium very short above, in the median line only about one-half as long as the prostomium, nearly twice as long at the sides and carried forward to embrace the prostomium, the cephalic margin as a consequence being deeply concave. Ventrally it forms the usual bilobed lip, which is quite distinct from II. Nuchal cri arise from extreme anterior border of peristomium in line with the posterior paired tentacles and separated by a distance of twice their length, very slender and tapered. Somites II and III equal and elongated, each as long as prostomium and peristomium combined, but no wider than the latter. Both are simple segments, widest anteriorly. Behind II] the segments gradually increase in width and decrease in length to X, from which they remain nearly uniform for the length of the piece, being quite simple and about five times as wide as long; dorsally they are flat, ventrally strongly convex, the parapodia arising high up. Furrows well-marked and clean-cut and the cuticle very smooth and highly iridescent. Anterior parapodia (Pl. XVII, figs. 58 and 59) elongated and rather slender, prominently outstanding and fully equalling the width of their somites, from the anterior ends of which they arise. The first two are directed somewhat forward, but little more than those of O. vexillaria. From the ventral level of the first they gradually rise until the dorsal level is attained by the eighth. No important differ- ence is noticeable among the first seven or eight. All have the some- what prolonged, slightly flattened, neuropodial body terminated by a short and broadly rounded presetal lip and a moderately prolonged postsetal lip decidedly flattened at the base. Notocirri and neuro- cirri clavate, with thickened bases and more slender distal parts ending bluntly; the former are longer than the postsetal lips and more slender, and below their thickened bases, borne on a slightly con- stricted notopodial base; the neurocirri more proximal in origin and equal to or shorter than the postsetal lip. At the eighth foot the 1911.] NATURAL SCIENCES OF PHILADELPHIA. 271 neurocirrus begins to undergo rapid reduction, and by the eleventh its conical form and cirrus character are lost and it has assumed the form of a low, smooth, rounded, opake and whitish swelling, which increases in size to about XXV and then diminishes gradually, though it remains as a small whitish spot even at the end of the piece. The postsetal lobe retains its character longer, undergoing very gradual reduction after X and shifting more ventrad. Even at XX it is quite as long as the body of the parapodium and of a short conical or sub- triangular form. At L (fig. 60) it is a minute blunt papilla, ventro- caudad of the seta tuft, and farther back disappears altogether. Notocirri become more slender, but retain their length, continuing to reach the middle line as far back at least as the eighty-ninth segment. In the middle region the bodies of the parapodia are reduced and somewhat compressed and bluntly rounded, and are situated near the level of the dorsum. On the three specimens known the gills begin as single filaments on somites VIII or IX and never possess more than four filaments, and that number only rarely. Two filaments appear at from XXII to XXVI, three at from XX XIII to XL and continue to LVI or LXIX where the number is reduced to two again and so continues to the end of the several pieces. Not infrequently a segment fails to develop a gill on one or both sides and frequently the number of filaments is below the normal of the region. The gills, though of few filaments, are typically pinnate (fig. 60) and the filaments rather thick and short, the longest very constantly reaching just to the median line. They arise on the dorsal side of the notocirri on a common notopodial base. Acicula of anterior neuropodia usually three, yellow, stout, tapered, gently curved and terminated by long freely projecting mucronate tips. On posterior neuropodia there are often only two acicula which are like the anterior ones except that they are rather abruptly bent near the distal end. Notopodial acicula are three or four delicate fibers which enter the base of the notocirrus. Sete are of vitreous structure and all more or less yellow, the more slender ones being very pale, the stouter ones deeper. The usual four kinds occur, but they present greater variation and more transition forms than usual. Articulated crochets (Pl. XVII, figs. 61, 62) are confined to the first eight parapodia. On the first three they occur in an irregular, open, vertical, preacicular series of three or four, one or two on the acicular tubercle beneath the aciculum and one post- acicular—about six or seven inall. On the fourth foot (V) those in the dorsalmost part of the fascicle are replaced by simple acute set, but 272 PROCEEDINGS OF THE ACADEMY OF [April, at least one compound crochet persists to the eighth foot and three to the seventh. They are rather slender, with well-developed articu- lation and distal pieces that vary much in length (figs. 61 and 62) the longest being dorsal, the shortest ventral. They end in a slender, acute, strongly hooked tip, beneath which are two prominent and acute spurs, the whole enclosed in a split guard closely fitting the terminal hook and scarcely prolonged beyond it. Simple, acute sete are represented by one or two small ones on the first and second parapodia, but are not clearly distinguished from the acicula, above and behind which they he. Farther back they become more numerous, longer, much more slender, and finally even the very narrow limbus that they present anteriorly disappears. On posterior parapodia the fascicle is composed exclusively of six or eight sets of this type. In the subacicular region the articulated crochets are replaced by short, rather broad, acute sete, more or less distinctly articulated (fig. 63). Such sets continue to between somites XV and XX. The larger articulated crochet which appears in the acicular process of anterior parapodia seems to persist, become stouter, lose its articulation and gradually its terminal hook (fig. 65), thus becoming converted into a simple bidentate hooded crochet similar to those occurring on pos- terior segments. This transition is well shown up to somite XV of the mounted cotype. Apparently, however, there is a gap between the last of these and the first of the posterior simple crochets, two of which appear together ventral to the acicula at about somite XX of these specimens. Unlike the anterior crochets, they project only slightly. They are deep yellow, stout, bifid, with the main tooth below and have the end enclosed in the usual cleft hood (fig. 66). Pectinate setee (fig. 64) occur in the dorsal fascicle of most segments, but their exact distribution was not determined. They are very delicate, with the widened end very little curved and bearing only a small number of rather long processes. Jaws described from a single dissection. Mandibles (fig. 67) soft and thin, the carriers nearly colorless with a black streak distally, narrow, of nearly uniform diameter, lightly united at the distal end; masticatory plates white, irregularly trapezoidal, each divided by a deep anterior notch into two large teeth, each of which is again notched. Maxie (fig. 68) thin, very pale brown with narrow deep brown marginal lines and thickenings; carriers of forceps-jaws as wide as long, shield-shaped, with straight transverse hinge line; basal half of forceps thickened, distal slender, regularly tapered, moderately curved and acute. Maxille II large, subtriangular plates, each of the three bearing 1911.] NATURAL SCIENCES OF PHILADELPHIA. 273 ten (or the outer left, nine) small, regular close teeth. Maxille III curved, ridge-like pieces, the left with six, the right with eight small teeth. Maxille IV very small, edentulous. Color generally dull olive-gray, becoming purplish and more iri- descent anteriorly, except on the parapodia and cephalic appendages. Dorsum and to a less extent the sides obscurely clouded, or on one specimen distinctly mottled with dusky. Except on the first ten or twelve segments, there is a more or less distinct double dorsal median dark brown line showing a tendency to break into metameric spots. A series of dorso-lateral spots above the parapodia. Like so many of the species taken at the same station, the surface is marked with strictly quadrate spots scattered over the head and its appendages, parapodia and body segments. A complete tube is 152mm. long and has an external diameter of 2.5 to 3 mm. Its foundation is arather tough membraneous lining inter- mediate in character to that of ordinary Nothria and Hyalinecia tubes and having a diameter of 1.4 mm. The tubes are very fragile and covered externally with a thick but irregular layer of sand grains and small pebbles. Many of them bear a few rather large pebbles, especially near the lower end, where they probably serve as anchors. One is peculiar in the development at one end of an expanded disk, from the margins of which radiate irregularly a number of hollow fibers or minute tubes probably the work of another than the rightful occupant. Thirty tubes and three worms were taken at the only station, 4,454, off Point Pinos Lighthouse, Monterey Bay, 65-71 fathoms, green mud, sand and gravel. Diopatra ornata sp. noy. Pl. XVIII, figs. 77-85. So far as known, this species is below the size usual in the genus, but all of the four specimens are incomplete. The type and most complete one is in three pieces, having an aggregate length of 84 mm. and 121 segments. Maximum width (at XX) of body only 3 mm., between tips of parapodia 4 mm.; depth 1.8 mm. As viewed antero-dorsally, the prostomium is nearly circular, being bent downward with a nearly vertical flattened frontal face, the seven tentacles almost in contact at their bases, radiating regularly from a point anterior to the center of the prostomium, the flattened circle enclosed by their bases scarcely exceeding the sectional area of any one of the tentacles, while the region posterior to the tentacles is strongly convex. Frontal tentacles almost in contact on anterior margin, about as long as prostomium, conical, obscurely annulated. Anterior paired 274 PROCEEDINGS OF THE ACADEMY OF [April, tentacles situated slightly dorsal to margin, immediately behind and almost in contact with frontal tentacles, reaching to VII or VIII; the ceratophores slightly longer than frontal tentacles, divided to the end into eight or ten annuli; the styles smooth and slender. Posterior paired tentacles on dorsum well back from margin and immediately above and behind anterior paired, reaching to XV or XVI; cerato- phores shorter and stouter than anterior paired, nine- to eleven-annu- late. Median tentacle posterior to middle of prostomium, reaching XIV, witha shorter ceratophore having nine annuli. Apparently all of the tentacles have lost a short portion of the tip and each one is marked by a more or less distinct broad purple zone. Palps prominent, divergent and directed ventrad, bilobed by a shallow transverse furrow. No eyes detected and pigmented eyes certainly absent. Peristomium nearly as long as prostomium, its anterior end scarcely wider, little concave and its sides continuous with prostomium, its dorsum strongly convex. Nuchal cirri on anterior margin of peristo- mium, slightly longer than prostomium and reaching two-thirds or three-fourths to base of opposite cirrus, regularly tapered from base to tip, often with a purple spot. Ventrally the peristomium forms a pair of thick folds behind the palps and a bilobed hinder lip. The next two segments, each about as long as peristomium, slightly carried forward at sides to bear parapodia and embrace the preceding segment, but not conspicuously enlarged. Succeeding segments become slightly wider to about XV, after which they remain practically un- changed. Those of middle region about four times as wide as long, smooth, simple, rather strongly depressed. Pygidium unknown. Parapodia of the prebranchial region (Pl. XVIII, fig. 77) large and prominent, the undivided body alone of the first three exceeding one-half the width of their segments, projecting somewhat forward from the anterior ventro-lateral region of their segments.. They have stout, slightly compressed, subtruncate, cross-furrowed, chiefly neuro- podial bodies and the usual notocirrus, neurocirrus and postsetal lobe or middle cirrus, all of which are rather stout and subconical, the postsetal lobe being somewhat flattened and the notocirrus about one and one-half times as long as the others, with a basal constriction. The fourth foot (on somite V) is similar to the three preceding ones, but decidedly smaller. With the fifth a considerable reduction in size takes place and the parapodia have approached the dorsum, at which level all succeeding ones remain, the body becoming at the same time much reduced, short, truncate, subconical and directed somewhat dorsad. At the fifth parapodium the neurocirrus becomes much 1911.] NATURAL SCIENCES OF PHILADELPHIA. 275 shorter and bluntly rounded at the apex; at the sixth it is replaced by an oval glandular swelling, which mereases in area but becomes less elevated for six or seven segments and then undergoes gradual reduction in the post-branchial region. After the appearance of the gills on VI the notocirrus also undergoes reduction, but so gradually that a small curus is still present on the one hundred and twenty-first segment. The postsetal lobe becomes smaller simultaneously with the notocirrus, but much more rapidly, soon becoming minute and shifting to a post- setal position and practically disappearmg by the end of the branchial region. Gills begin on somite VI and continue to XLIX to LII on the several specimens. They arise on the dorsal side of the base of the parapodia by a stout base, on the ventral or lateral side of which the néurocirrus is borne (Pl. XVIII, fig. 78). Several anterior pairs are very large, the second in all cases exceeding all of the others and reaching quite to the tip of the notocirrus of the opposite side, the first being about seven-eighths and the third about three-fourths or more as long as the second. Succeeding ones diminish in length, at first rapidly, then slowly, the eighth equalling the body width, the twenty-first reaching the middle line, the forty-first being only as long as the notocirrus. Anterior gills are tall and slender when fully extended, being shaped much lke Lombardy poplar trees. The trunks have stout, feebly annulated bases above which they taper and are spirally twisted, bearing numerous, rather short spirally arranged filaments which become smaller distally. This spiral arrangement of the gills persists to at least NX XV, the number of turns varying with the length of the gill, the second and longest having twelve. Beyond somite XXXY, the trunks have become so short and the filaments so crowded that the appearance is brush-like. At XL there are only three short filaments, and the last seven gills consist of a single filament. each of which gradually diminishes in length. Neuropodial acicula three or four, tapered, curved, terminating in acute tips projecting beyond the end of the acicular process. Noto- podials one or two delicate rods or a bundle of fibers. Sete of the first four parapodia (II-V) chiefly compound crochets (Pl. XVIII, 79 and 80) arranged in a loose vertical preacicular series of about six or eight, of which one, much stouter than the others, is subacicular and one more slender postacicular. The latter (fig. SO) has the appendage considerably longer than the rest. All have the articulation well-developed, the end very strongly hooked and provided with a prominent accessory spur and well-developed guard, the end of 276 PROCEEDINGS OF THE ACADEMY OF [April, which is somewhat obliquely prolonged. On at least the first bran- chiate parapodium a few semicompound, sometimes acute (fig. 81), sometimes obscurely hooked setz persist, but give place to true acute simple setee on subsequent segments. A few short, simple sete occur in the dorsal part of the supra-acicular region of the first foot, and they soon form a well-marked, curved, horizontal series dorsal to the acicular process. These sete are slender with a very narrow limbus. On anterior branchiate parapodia, beginning with VI and continuing to about XXX is a vertical row of five or six short, stouter, thickened, but alimbate sets forming a vertical preacicular fascicle. These disappear as the gills become short and the stout ventral crochets appear, leaving only the dorsal group of acute sete, which become longer. Beginning somewhere between VI and X, and at first few in number, but increasing to a compact tuft clustered among the dorsal acute’setz and persisting with them to the end of the worm, are delicate gouge-shaped sete with finely pectinate border (fig. 82). A stout yellow crochet (fig. 83) appears below the acicula at about XXX and a few segments behind is joined by a second; they have a strong beak, short, thick accessory tooth and a pair of small guards. Mandibles dark brown with pale masticatory plates. Stems rather broad, of nearly uniform width, the distal end scarcely widened, the two sides very slightly united by a slender and short isthmus. Mas- ticatory plates small, transversely elliptical, scarcely toothed (fig. 84). Maxille (fig. 85) dark brown, massive, opake. Forceps jaws (1) massive, the carriers broad, together nearly orbicular with a flexible median joint and a posterior median notch; hinge line short; forceps with basal half thick, tapered to the incurved subacute ends. Mawille II broad, triangular, the cotype figured with the inner left plate absent, the remaining pair nearly symmetrical, the left with seven, the right with eight teeth, the most anterior in each case being larger than the others. The type has the normal arrangement of two pieces on the left side and one on the right, each bearing seven teeth like those figured. Maxilla III large curved plates usually with eight unequal teeth on each side. Maxilla IV small plates bearing a single small tooth. Color generally faded to a dull gray, the anterior end slightly pur- plish and purple zones on the cephalic tentacles and spots at the base of the nuchal cirri. Cuticle slightly iridescent. Some fragments of the exposed ends of tubes have the usual structure, with a tough, parchment-like basis thickly covered with pebbles, bits of shells, coral and other hard bodies mostly arranged transversely. 1911.] NATURAL SCIENCES OF PHILADELPHIA. 277 They closely resemble the tubes of Diopatra cuprea, but are scarcely more than one-half their diameter. Stations 4,457 (tubes only), off Point Pinos Lighthouse, Monterey Bay, 40-46 fathoms, dark green mud; 4,467, off Santa Cruz Lighthouse, 51-54 fathoms, soft dark green mud; 4,519, off Point Pinos Light- house, 27-35 fathoms, hard gray sand (type). Hyalineoia juvenalis sp. noy. Pl, XVIII, figs. 86-95. A small species represented by the anterior ends of two individuals, which, though mature, retain certain characters of sete, etc., which are found in quite young examples only of H. tubicola. The cotype, comprising the head and 35 segments, is 19 mm. long and 1.9 mm. in maximum width. The type, of the same size, has 32 segments and a posterior regenerating cone. Prostomium trapezoidal, the greatest width posterior and about one-third more than the length, the anterior and posterior sides convex, the converging lateral sides nearly straight. Frontal tentacles small, less than one-third length of prostomium, situated at antero-lateral angles, directed somewhat ventrad, but little divergent, subfusiform, about twice as long as thick, the pedicles much constricted. Median and posterior lateral tentacles situated well within posterior half of prostomium close together on dorsal face; anterior lateral tentacles farther forward on lateral margin. Ceratophores of anterior paired tentacles about as long as thick and 4-annulate, styles thickish and stout, barely reaching III. Ceratophores of median and _ posterior paired tentacles very short, obscurely divided into three annuli, the styles smooth, moderately slender, about one-half the diameter of the anterior pair, tapered, the median reaching to IX, the longest lateral to XI. Eyes black, very conspicuous, immediately behind the ante- rior and below the posterior paired tentacles. The type has but one pair about one-half the diameter of the base of the anterior tentacles; the cotype bears a second pair, almost as conspicuous and immediately dorsal to the first pair. Palps rather small, about one-third width of prostomium, globoid, directed ventrad immediately in front of mouth and only slightly in contact medially. Peristomium small, scarcely wider than prostomium and less than one-half as long, bearing the bilobed posterior lip. Somite II very much larger, nearly twice as wide and three times as long as the peristomium, extending forward and embracing the sides of the latter. The next few segments diminish in length rapidly until the normal length to width ratio of one to four or five is reached at somite VI. Beyond this point the segments continue to increase in size and the 278 PROCEEDINGS OF THE ACADEMY OF [April, maximum diameter is probably not quite attained in these pieces. The first few segments are firm-walled and bounded by deep furrows, but farther back they become softer and the furrows shallower. All are nearly terete, but slightly flattened and grooved ventrally. Py- gidium a very small, short, truncate cone bearing a pair of very slender tapering cirri about one and one-fourth times the greatest diameter of the body. Parapodia generally similar to those of larger species, but relatively less enlarged and prominent. First pair (on II) largest, projecting forward and slightly ventrad, but barely reaching level of anterior border of palps, truncate, conical, transversely furrowed and terminated by a broad, flat, prominent, preacicular lip and a slender but about equally long, more cirriform postacicular lip. Both notocirri and neurocirri are simple, conical styles without differentiated cirrophore and of similar form and size, not quite reaching the end of the terminal lips, the neurocirrus arising on the antero-ventral part of the base of the neuropodium close to the side of the mouth, the notocirrus nearly half-way out on the postero-dorsal aspect of the foot. The second foot (Pl. XVIII, fig. 86) is similar, but decidedly smaller and projects very little forward and ventrad. The third is modified still farther in these respects, and the fourth (fig. 87) has attained the typical position and nearly typical proportions and differs particularly from preceding parapodia in its much shorter, blunt neurocirrus. The one figured (fig. 87) has the postsetal lip abnormally bifid. On the first parapodium the postsetal lip is shorter than the presetal, but on the second this relation is reversed and the latter disparity becomes more pronounced on succeeding parapodia until at somite X the postsetal lip becomes again reduced to the length of the presetal lip and assumes the form of a small cylindroid papilla. This continues to diminish, shifts to a more ventral position and finally disappears, leaving only the short, broadly rounded presetal lip of the low, flat parapodia of middle segments (fig. 88). Notocirri undergo very regular and gradual diminution in size and with the appearance of the gills (about XX) have become quite minute and little longer than the presetal lip, ap- pearing as small processes from the outer side of the base of the gills. Neurocirri remain the same for the first three parapodia and then very abruptly become altered to a small, thick papilla. which in the course of one or two more segments becomes absorbed into a low swelling and extensive glandular region ventral to the parapodium. On the cotype gills begin symmetrically on XIX; on the type there is a small one on one side of XVIII, fully developed ones on both sides 1911.] NATURAL SCIENCES OF PHILADELPHIA. 279 of XIX, none on XX and then from both sides of XXI caudad. On both specimeris they continue to increase in length gradually and probably reach their maximum size at XXIII where they about reach the dorsimeson and are five to six times the length of the dorsal cirrus, the length of which, indeed, scarcely exceeds their diameter (fig. 88). They have the usual structure, being coarse filaments containing a large axial blood-vessel, and within the limits of the piece exhibit no indication of becoming flattened. Neuropodial acicula pale yellow, generally three, but posteriorly only two, stout, tapered, slightly curved, the pointed apices projecting only slightly beyond the integument. Notopodial acicula a small fascicle of fibers. Sete of four kinds. The first three parapodia bear a few stout, compound crochets in a vertical series. They are especially large on the first and project freely forward. On the second and third parapodia (fig. 89) they become smaller and paler in color. None seem to be truly compound, but the oblique joint is imperfect and near the end. The shaft or portion of the setee proximad of this interrup- tion is slightly thickened in its distal portion and minutely roughened, partly with minute imbricated, antrorse scales and partly with minute hairs. The distal piece or appendage is somewhat recurved, tapered to the peculiarly formed bidentate tip, which is enclosed in a pair of broad obliquely truncate guards. It is possible that larger specimens (should such occur) would lose some of these characters through wear. Beginning on the fourth foot (V), the compound crochets (one or two of which may remain, though there are none on these specimens) are replaced by simple setee which are characterized by a finely roughened enlargement beyond which they taper to an acute curved tip. Farther back these sete are partly reduced in size, but chiefly transformed into small supra-acicular and subacicular fascicles of simple setze with broadly bilimbate, lanceolate blades (fig. 91). Associated with these sete in the dorsal fascicle, beginning on the second foot is a dense tuft of very delicate pectinate sete, the abruptly widened end of which (fig. 92) is bent into semicircular form and bears about thirty regular and equal teeth and mucrons. On posterior segments they become much wider and flatter. Beginning at about somite XX, two stout, yellow, slightly clavate, bluntly rounded bidentate and guarded crochets appear in the subacicular fascicle of each crochet (fig. 90). Jaws thin and fragile, but hard and well-chitinized. Mandibles (figs. 93 and 94) pale brown, with some dark streaks, the stems regularly tapered, slightly enlarged at the distal end where the two are feebly 280 PROCEEDINGS OF THE ACADEMY OF [April, united. Masticatory plates white and hard, slender, ovate, with smooth or slightly wavy margins, borne in a distal depression of the stem which projects beyond the masticatory plate on the lateral side as a blunt tooth. The mandibles of the type are much larger than those of the cotype, though the two worms differ but little in size. Maxille (fig. 95) pale brown, the teeth and other thickened parts darker. Carriers of forceps-jaws (1) broad, together about four-fifths length, subquadrate, with a short, blunt projection at the postero- lateral angle; the forceps with basal half broad and nearly straight, the distal half slender, tapered and not very strongly hooked. Max- ille II, outer left plate with thirteen large and one or more very small posterior teeth, inner left with twelve teeth, right plate with fourteen or sixteen or even more teeth. Maxille III, left with seven to nine small teeth, right with about ten teeth. Maxilla IV, delicate, with one small tooth or none. Generally pale or colorless, a small, indefinite, median dorsal, purple spot on anterior dorsal part of prostomium, a pair of small ventral spots below outer lateral tentacles, small brown spots at base of notocirri and a few dark speckles on anterior segments. Cuticle only slightly iridescent. A probably incomplete tube is 65 mm. long, shghtly curved and tapered, the large end being 2.5 mm., the smaller 2.2mm. The surface is rougher than that of small tubes of H. tubicola and the annulations are 2 mm. apart and obscure. Although translucent and nearly free of incrustations, it is not possible to determine the character of the valves. An empty tube has living within it a small polynoid, not yet removed for examination, and, completely closing the larger orifice so that the annelid could not leave, is a small hermit crab (Hupagurus or Para- pagurus) with very unequal chela, the right being much the larger and forming a symmetrical plug beautifully adapted to the form and size of the tube. Type and only station 4,431, off Santa Rosa Island, 38-45 fathoms, varied bottom. . Hyalinecia tubicola (Miller) Malmgren, stricta subsp. nov. Pl. XVIII, figs. 96, 97. Hyalinecia tubicola Malmgren, Ofversigt Kongl. Vetens-Akad. Férh., XXIV (1867), 181, 2, Taf. 1X, fig. 49. This is a form of large size, as indicated by the measurements of the tubes given below, somewhat exceeding H. artifer Verrill. In many respects it resembles H.t. longibranchiata McIntosh, from the vicinity of New Zealand, but has no eyes. 1911.] NATURAL SCIENCES OF PHILADELPHIA. 281 Ceratophores of cephalic tentacles, either not annulated or obscurely 3- or 4-annulate. Anterior paired tentacle reaches IV or V, posterior paired XIII to XVII on different specimens, and median tentacle usually to XX. Somite II is much enlarged, being fully double the length of the peristomium, and its very large stout parapodia bear three or four stout spines which reach quite to the anterior level of the prostomium. Neurocirri of the first parapodium lie close to the sides of the mouth; they diminish in size after the third foot (IV) and become obsolete after VII. On different specimens the gills begin on from XXVI to XXX and at their maximum development reach about three- fourths of the width of the dorsum. They continue to the twelfth segment preceding the pygidium, becoming rapidly reduced in size toward the caudal end. Pygidium ending in a furrowed circumanal ring directed dorsad and bearing a pair of subanal cirri arising in contact, flagelliform, very slender and as long as the last eleven seg- ments or twice diameter of body. The distinctive features of the subspecies are found mainly in the large posterior crochets and the jaws. The former (Pl. XVIII, fig. 97) have the terminal teeth continued nearly in the direction of the shaft and not placed at a considerable angle with it as in most forms. Pectinate sets have the plates bent into two-thirds of a circle with very numerous denticulations. A young specimen (about 2 mm. in diameter) still retains on the large spines of anterior parapodia traces of terminal teeth and guards (fig. 96). The maxille are long, with numerous teeth: II left side outer plate 18 teeth, inner plate 15 teeth, right side 17 teeth; III, left 9 teeth, right 10 teeth; IV rudimentary with one tooth on each side. Mandi- bles have the two sides entirely distinct. The anterior end of the body and the head are minutely speckled with pigment. A typical example of the more than thirty tubes in the collection is 198 mm. long, 4.5 mm. in diameter at the small and 6 mm. at the large end. Others vary from 72 mm. long and 3 mm. in diameter to 236 mm. long and 7 mm. in diameter, the great majority being about 200 mm. long. They are gently curved and tapered and toward the larger end elliptical, not circular, in section, the diameter in the plane of curvature being slightly less, indicating a dorso-ventral depression. The tubes have a quill-like texture, but are harder and more rigid than any quill of similar size and can be cut with a knife only with difficulty. The maximum thickness of more than } mm. is at the middle, where the number of layers is greatest and diminishes most toward the large end 282 PROCEEDINGS OF THE ACADEMY OF [April, where the last inch or so is rather soft and semicollapsible. For the entire length the tube is marked with annular lines which, on a tube 198 mm. long, are 6.5 mm. apart at the small and end 5 mm. apart at the large end. These annulations are formed by the exposed edges of the successive layers of material, which are laid down on the inside and project beyond the orifice to a distance equal to that between two rings. Thus a tube showing thirty-five rmgs has probably been constructed of as many successive layers of material. Both orifices are guarded against intrusion by several sets of soft membraneous valves, usually three or four at the large end and proba- bly as many at the small end. These are placed in pairs consisting of a wide dorsal and a ventral flap or pocket attached obliquely to the inside of the tube in such manner that the free borders directed toward the orifice meet in the middle and thus effectually bar against entrance, while yielding readily to pressure from within. Presumably, should a worm leave its tube it would itself be debarred from re-entering. One small tube (110 mm.) has the orifice ornamented with a few foraminifera shells, sea-urchin spines and small pebbles. Evidently the tubes wear away at the small end, the worm occupying the newer parts and building extensions at the large end and at the same time removing old valves and replacing them by new pairs. It is evident also that the length of additions decreases as the tubes become larger and that there is much individual variation in this respect. Old tubes are always covered with a friable black incrustation, except on the newer parts at the large end, and especially adherent at the rings. Some of them also bear growths of hydroids and an occasional barnacle (Scalpellum proximum Pilsbry) small tunicate (Styela) or small actinian (Sagartia sp.) Found at only one station, but there in abundance: 4,387, vicinity of San Diego, Lat. 32° 32’ 40” N., Long. 118° 04’ 20” W., 1,059 fathoms, green mud. LUMBRINERIDZ. This is another fairly well-represented family and from the point of view of geographical distribution is interesting because, more than any other family, it resembles the fauna of the southern Pacific coast of South America. This resemblance is seen not alone in the fact that the two regions possess two species in common, but also in the resemblance of other species which are distinct. SAB ay NATURAL SCIENCES OF PHILADELPHIA, 283 / Ninoe gemmeasp. noy. Pl. XIX, figs. 101-109. Form moderately elongated, slender and terete, the anterior bran- chiate region wider and depressed. A complete example (type) is 104 mm. long with a maximum width, exclusive of parapodia, of 2.4 mm. at XXX. Segments 146. Prostomium small, slightly longer than wide, distinctly depressed, subovate, continuing the outline of the anterior end of the body forward to a subacute apex, very smooth and differentiated only indistinctly from the peristomium at the sides. The mid-dorsal portion of the pro-peristomial furrow forms a broad but shallow, semicircular or crescentic furrow, the horns of which end at a pair of small translucent spots marking the tips of the forward lateral pro- jections of the peristomium. It is uncertain whether or not a minute obscure papilla exists at the bottom of this nuchal furrow. On the ventral surface is a pair of slight submarginal longitudinal grooves which meet the lateral furrows bounding the prominent quadrant- shaped palps which are separated by a deep medial furrow. No eyes. The outline passing from the prostomium into the peristomium and body is very regular and unbroken. Peristomium and somite II apodous, together equalling the prostomium in length; the peristo- mium longer at the sides, but dorsally cut into by a deep re-entering bay, reducing it to the length of Il. Ventrally they coalesce to form a deeply furrowed lip. Segments simple, very smooth and regular, and separated by deep, even furrows, the length to width ratio varying from one to four or five at the anterior end to one to two at the posterior end, toward which their length increases both relatively and actually. From the point of greatest diameter at about XXX, the body tapers very regularly and gently to the caudal end, being for most of the length strictly terete. Cuticle highly polished, with a pearly irides- cence. Pygidium a small, obliquely flaring ring, bearing at the sides of a small ventral platform a pair of conical cirri about as long as the diameter of the pygidium. Parapodia strictly lateral, uniramous, with quite rudimentary noto- podium. The first few are very small, slightly compressed tubercles with obsolete presetal lip and subfoliaceous, cuneate-ovate postsetal lip as long as the body of the foot (Pl. XIX, fig. 101). Farther back, in the branchial region, the presetal lobe becomes a hemispherical swelling, which is again lost posteriorly. At VI, or in one case, V, the postsetal lip bifurcates, the ventral lobe remaining as before, the dorsal being cirriform and slightly longer. On succeeding segments the 284 PROCEEDINGS OF THE ACADEMY OF [April, latter becomes more distinct and larger than the other branchial filaments and curves somewhat dorsad into a suberect position (fig. 102). The remainder of the postsetal lip then divides into the filaments of the digitate gill, the ventralmost filament of which retains a trace of the foliaceous condition in a small basal wing. Otherwise the branchial filaments resemble the dorsalmost filament or cirrus, and where best developed only equal the foot in length and spread in a palmate fashion (fig. 103). On the type there are two filaments at X, three at XIII, continuing with three or occasionally four to XLIX. The filaments increase in length to about XL and then rapidly diminish without change in number to XLIX, at which segment the dorsal one alone remains. It bears a small basal wing and remains quite promi- nent for many segments and finally after reduction to a small post- setal papilla continues to the end. A slightly larger cotype has two branchial filaments at VIII, three at XVI, four or rarely five between XX and XLII and three from XLII to LII. In the postbranchial region the parapodia (fig. 104) are more slender and relatively more prominent, cylindroid with the end slightly cleft into presetal and postsetal lips, the latter a subconical papilla. A minute notopodial papilla at the dorsal base of the neuropodium of all segments. Neuropodial acicula black with pale bases, usually four, slightly tapered to blunt tips which reach, but ordinarily do not project beyond, the surface. Notopodial acicular fine fibers which pass from the segments above the parapodia strongly ventrad, curving into the notopodial tubercle. All setze have black or dark brown stems and pale ends, which on the limbate sete includes the entire blade. All sete are simple, and limbate setze and crochets occur together on all parapodia, the former being more numerous on anterior, the latter on posterior parapodia. All are very brittle and, owing to the frequency with which they are broken, the exact arrangement was not determined. At least one crochet occurs in the subacicular fascicle of III along with three or four limbate sete, of which an equal number exist in the supra- acicular fascicle. At X there are four supra-acicular acute limbate sete, six subacicular limbate crochets and below these two more acute sete. At XXV the numbers are respectively seven, five and one. On posterior parapodia the usual arrangement is one acute seta and one crochet in the supra-acicular fascicle and four crochets in the subacicular fascicle. The pointed setze (Pl. XIX, fig. 105) are of the usual bilimbate type and either simply or sigmoidly curved. Some of those in the dorsal 1911.) NATURAL SCIENCES OF PHILADELPHIA, 285 fascicle of anterior segments have the wings abruptly terminated and the shaft continued as a very long acute mucron. They differ con- siderably in length and proportions in the same bundle and posteriorly all become much elongated and slender. Anterior crochets (figs. 106, 106a) are transitional to the acute limbate sete, having long, slender limbate ends passing into delicate rounded hoods which enclose the small, indistinctly toothed heads. Though gradually diminishing in length, they undergo no conspicuous change through the branchial region, but posteriorly become converted into true crochets (fig. 107) which are alimbate, somewhat stouter and have shorter, thicker ends and more inflated hoods enclosing a well-developed beaked and crested head. Mandibles (Pl. XIX, fig. 108) delicate, flexible and nearly white, ex- cept that the tips of the masticatory plates and a pair of submedian lines are black. Carriers or stems long and slender, separated for about the posterior two-thirds of their length, firmly united anteriorly and widened into a broad plate bearing the narrow, strongly curved con- tinuous masticatory plate which terminates in a strongly but irregu- larly toothed apex. Maxille (Pl. XIX, fig. 109) deep brown, opake, the forceps jaws with long bases or carriers nearly equal to the jaws in length, together having the outline of an urn, but not united medially; hinges well-developed and the jaws very strongly and regularly curved. The large dental plates (II) are massive, symmetrical and each provided with a series of eight regular stout teeth on the inner margin. Max- illee III small, narrowly ovate with one large hooked tooth succeeded by a slightly curved, serrate margin. Anterior maxille (IV) large, with similarly serrate, medial margin, but the large tooth less well- developed. A single specimen lacking the caudal end and exceeding 3 mm. in diameter appears to be quite typical in all respects. Parapodial cirri are rather shorter than usual, both cephalic and caudal para- podia have dark pigment spots and the furcate setz are very short. Station 4548, off Point Pinos Lighthouse, 46-54 fathoms, coarse sand and shells. 218 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV STERNASPIDAE Sternaspis scutata (Ranzani) Otto. Two specimens agree fully with North Pacific examples of the species. They measure 31 mm. long and 14 mm. in diameter and bear six pairs of anterior and ten pairs of lateral scutal sete bundles. Station 4339, off Point Loma Lighthouse, 241—269 fathoms, green mud. Sternaspis fossor Stimpson. Unlike the last this species is widely and abundantly represented: As in specimens previously reported from the North Pacific there is one less pair of anterior scutal cost and sete bundles than in S. scutata. They range from 8 to 15 mm. indiameter. Very abun- dant at stations 4457, 4464 and 4475. Stations 4309, off Point Loma Lighthouse, 67-73 fathoms, fine sand ;4322, off Point La Jolla, 110-199 fathoms, soft green mud ; 4332, off Point Loma Lighthouse, 62-183 fathoms, gray sand; 4343, off South Coronado Island, 55-155 fathoms, fine gray sand; 4349, off Point Loma, 75-134 fathoms, green mud and fine sand; 4351, off Point Loma Lighthouse, 433-488 fathoms, soft green mud; 4354, same locality, 646-650 fathoms, green mud; 4364, same locality, 101-129 fathoms, green mud, gray sand; 4381, off North Coronado Island, 618-667 fathoms, green mud; 4453, off Point Pinos Lighthouse, 49-51 fathoms, dark-green mud; 4457, same locality, 40-46 fathoms, dark-green mud; 4464, same locality, 36-51 fathoms, soft dark-gray mud; 4475, same locality, 58-142 fathoms, soft green mud; 4480, off Santa Cruz Lighthouse, 53-76 fathoms, dark-green mud and sand; 4485, same locality, 39-108 fathoms, soft green mud and sand: 4510, off Point Pinos Lighthouse, 91-156 fathoms, gray mud; 4522, same locality, 130-149 fathoms, gray sand and shells; 4523, same locality, 75-108 fathoms, soft dark mud; 4550, same locality, 50-57 fathoms, green mud. OPHELIIDAE Ophelia sp.? One much damaged specimen. Station 4549, off Point Pinos Lighthouse, 56-57 fathoms, coarse sand. 1923] NATURAL SCIENCES OF PHILADELPHIA 219 Ammotrypane aulogaster Rathke. Several specimens measuring from 25 to 44 mm. long with forty- eight to fifty-two segments agreeing in all respects with A. aulogaster of European waters. Most of them have the ventral caudal cirri shorter than usually figured; on one they are three-fourths the length of the spoon-shaped appendage. Stations 43806, off Point Loma Lighthouse, 207-497 fathoms, green mud and fine sand; 4307, same locality, 169-496 fathoms, gray mud and fine sand; 43864, same locality, 101-129 fathoms, green mud and gray sand; 4367, same locality, 201—215 fathoms, green mud; 4382, off N. Coronado Island, 642-666 fathoms, green mud; 4387, same locality, 85 fathoms, gray sand; 4453, off Point Pinos Lighthouse, 49-51 fathoms, dark-green mud; 4475, same locality, 85-142 fathoms, soft green mud; 4524, same locality, 213-228 fathoms, soft gray mud. Travisia granulata sp. nov. Five specimens vary in length from 30-52 mm. and in diameter from 3 to 7 mm. Diameter very uniform throughout most of length, tapering at ends only. Segments 32 to nearly 50. Prostomium and rather prominent blunt cone clearly distin- guished from the uniannular peristomium which is marked by a deep groove at the parapodial level on each side, ventral to which it is continued as a narrow, grooved, median area, which cuts through somite II to the mouth. Somite II is setigerous and conspicuously divided into two rings and by several longitudinal grooves into smaller areas especially conspicuous at the sides. Somites III to XX are triannulate, the middle or setigerous annulus being dis- tinetly larger than the lst and 3rd. The more anterior segments are divided into areas by several longitudinal furrows. At XXI, the first ring disappears and the anterior is three or four times as long as the posterior. Caudally, these biannulate somites gradually change to the simple uniannulate somites, the number of which varies in different specimens and which gradually diminish in size to the pygidium. Pygidium a small cylindrical ring, divided into thirteen rather irregular, marginal papille, usually alternately larger and smaller. A conspicuous characteristic of this species is the large size and abundance of the surface pustules which are so crowded over most parts of the body as to give an aspect of close granulation. They are largest on the anterior segments and elsewhere in the neigh- borhood of the parapodia and along the caudal border of each annulus which forms a faintly lobulated fold embracing the suc- ceeding ring. The lateral sense organs, which are so conspicuous 220 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV in T. pupa and T. forbesii and other species, are so covered by these structures that they are hidden. Parapodia and sets present no distinctive features. No set were detected on the last five segments. Notopodial cirri (branchiz) begin on III and are present on all but about the last six somites and on most segments have a length of nearly or quite one-fourth of the body diameter at that point, but become reduced before disappearing at the caudal end. This species belongs to Dindymeme Kinberg (Dindymenides Chamberlin) if that genus be recognized. Stations 4304, off Point Loma Lighthouse, 25 fathoms, coarse yellow sand; 4479, off Santa Cruz Lighthouse, 33-45 fathoms, hard sand, (type); 4549, off Point Pinos Lighthouse, 56-57 fathoms, coarse sand, shells and rock. Travisia brevis sp. nov. The five known specimens of this species are all small, measuring from 11 to 21 mm. long and 3.5 to 4 mm. in diameter, and all have 29 segments. Prostomium and peristomium together form a bell-shaped head, of which the former represents the handle, being a short blunt cone, thickly covered, like the rest of the body, with pustules. Peristomium uniannulate and in the neural field produced caudad and cutting II to the mouth. Somite II shghtly longer than I and obscurely divided into two rings, of which the caudal bears the sete and between them a sensory pit. Mouth a small opening surrounded by radiating furrows between II and III. Somite III obscurely triannular above, the posterior annulus being well differentiated but the furrow between the first and second very shallow. Somites IV to XVI or XVII are triannulate, the equal rings being very distinct dorsally and ventrally but indis- tinguishable laterally in the parapodial areas. At about XIII these parapodial areas begin to increase and encroach upon the inter- annular furrows which become correspondingly reduced both above and below and finally restricted to the dorsal and ventral fields, the segments also becoming correspondingly smaller. By XX the segments have become practically uniannular, the third ring being suppressed and the first reduced to short crescentic dorsal and ventral inserts. In this region the parapodia have shifted to the ventral surface which consequently appears angulated. At XXVI the diameter is abruptly reduced, the remaining four somites forming a tube which terminates in the slightly enlarged rosette-like pygidium marked by twelves radial furrows into ridges ending in as many short perianal papille. Parapodia from III to XXVI inclusive, biramous. On anterior segments they are very short and being retractile into pits, the 1923] NATURAL SCIENCES OF PHILADELPHIA 221 small notopodial and neuropodial sete tufts often appear to be sessile, with a minute dorsal notopodial and a ventral neuropodial tubercle, while between the rami is a sensory pit. Caudad of the middle of the body, as the sete become smaller, these tubercles increase in length and by XVII they are quite prominent and become increasingly so for several segments but are again smaller on XXIV to XXVI where they cease. The intra-podal sensory pore may be traced from II to XXVI inclusive. At VIII! a larger pore appears just ventral and anterior of the neuropodium and may be traced to XV. NotopodialJ cirri or branchie begin on III and continue to XXIV, arising in contact with the ventrocaudal faces of the notopodial tubercles. They are slightly flattened, conical, tapering, and slightly shorter than the segments to which they belong, becoming much reduced caudally. Stations 4322, off Point La Jolla, 110 fathoms, green mud and shells; 4332, off Point Loma Lighthouse, 62-183 fathoms, gray sand, (type); 4550, off Point Pinos Lighthouse, 50-57 fathoms, green mud. Travisia pupa Moore. Eleven specimens in all measuring up to 85 x 18 mm. agreeing in having thirty-one or thirty-two segments, cirri on III to XX VI inclusive and hispid sete, from the following stations: 4325, off Point La Jolla, 191-292 fathoms, green mud and fine sand; 4358, off Point Loma Lighthouse, 167-191 fathoms, green mud; 4365, 6 and 7, same locality, 130-215 fathoms, green mud. CHLORHAMIDAE Stylaroides collarifer Ehlers.? A single specimen of a species identical with or very close to S. collarifer. There are thirty-four segments and the body is much swollen in the middle part, contracted toward the ends and with the cephalic region flattened. An adherent layer of sand forms a hard crust especially at the anterior end and roughens the surface throughout. Station 4351, off Point Loma Lighthouse, 423-488 fathoms, soft green mud. Stylaroides papillata Johnson. c Two specimens of 18 mm. and 31 mm., both exclusive of the cephalic sete, have forty-five and sixty-seven segments respectively. 1Very minute ventral sensory pores may be detected in some specimens on segments anterior to VIII. 222 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV The sete of the first setigerous segment are about four times the body diameter, those of the second two-thirds and of the third one-half as long. Ventral setze much shorter. Stations 4431, off Santa Rosa Island, 38-45 fathoms, mud and coarse gray sand; 4574, off Cape Colnett, lat. 30° 35’ N., long. 117° 23’ W., 1400 fathoms. Stylaroides pluribranchiata sp. nov.” The type is 30 mm. long with a maximum diameter including the parapodia near the cephalic end of 2.8 mm. and has 40 setigerous segments. First twelve segments uniform in diameter, very slightly depressed, the others terete, tapering very gradually to the caudal three or four segments which taper rapidly to the small pygidium. Prostomium retracted into the short, collar-like first setigerous segment, only the tentacles (branchie) and palpi showing. Tenta- cles in a crowded mass filling the opening of the cephalic collar, divided into a pair of groups of sixty or seventy each. All are slender, smooth, finger-like and about double the length of the first segment. Palpi project from ventral part of the mass of tentacles, fitting a recess formed by the narrowed ventral margin of the first setigerous somite. They are about twice as long as the ventral tentacles, thick, stout, blunt, deeply grooved and smooth, except for a cross-furrow here and there. Segments well marked throughout, only slightly less so anteriorly than posteriorly. First setigerous segment fully as wide as those following, forming a collar-like ring, prolonged and projecting at the sides opposite to the parapodia, contracted ventrally to about half this length and forming a sinus to accomodate the palpi. Succeeding segments slightly shorter than the first and simple rings separated by distinct but shallow furrows. After about XII, they become gradually reduced in diameter but undergo little change in length to about the caudal fourth. In this region, while the furrows are no deeper, the segments appear more distinct owing to the greater prominence of the parapodia. Pygidium a minute ring, slightly oblique dorsad, with a whorl of minute papille surrounding the widely open anus. Integument rather thickly and uniformly studded throughout with relatively coarse, rough papille, arranged more or less regularly in four transverse rows on each segment. They are of fairly uniform size throughout and each consists of a conical base and filamentous tip. Considerable fine sand adheres to the surface between the papille but is displaced rather easily. Parapodia consist of small flat notopodial and neuropodial papille, the former about three times the diameter and height of > This may belong to Saphobranchia which it resembles ‘n the character of the sete. 1923] NATURAL SCIENCES OF PHILADELPHIA 223 . the latter, placed close together on the sides of the segments. Posteriorly, while not becoming distinctly longer, but owing to the decreased diameter of the segments, the neuropodia stand out more prominently and the notopodia arise from their bases. Each ramus bears an especially long filamentous papilla behind the fascicle of sete, which may represent the cirrus, and several similar but smaller papillae clustered about the ramus. Setz of both rami of the first pair of parapodia project directly forward as flat fascicles of eight to ten each enclosing the head laterally. These sete, alike on the two rami, are as long as twice the body diameter, slender, tapering, articulated, the basal arti- culations being only as long as the diameter but increasing toward the tip to about four times as much. On II the sete of the noto- podium are about one-half as long as on I, similar in form and pro- ject less sharply forward. Those of the neuropodium are stouter and shorter. On all remaining somites the notopodial set project laterad, are about half the diameter of the body, slender capillary, regularly tapered, jointed and colorless. Neuropodial set are stouter (about three times diameter of notopodials), tapering near the end rather abruptly to a filamentous tip, pale brown, with articulations shorter and more numerous than the notopodials. Other specimens have a length up to 40 mm. and differ somewhat in the degree to which the body is distended, some being stouter, others more slender. In the first case the papille are more widely separated, in the second more crowded than in the type. Stations 43807, off Point Loma Lighthouse, 169-490 fathoms, green mud and fine sand; 4326, off Point La Jolla, 248-280 fathoms, soft green mud; 4369, off Point Loma Lighthouse, 260-284 fathoms, green mud and gray sand; 4412, off Santa Catalina Island, 265-274 fathoms, green mud and gravel (cotype); 4430, off Santa Cruz Island, 197-281 fathoms, black sand (type); 4517, off Point Pinos Lighthouse, 750-766 fathoms, green mud and sand. Flabelligera infundibularis Johnson. A single fragmentary specimen probably of this species taken at Station 4412, off Santa Catalina Island, 265-274 fathoms, green mud. MALDANIDAE Rhodine bitorquata sp. nov. Plate XVIII, fig. 30. This well-characterized species is known from fragments of anterior ends only. The type, consisting of the head and seven setigerous somites, is the best preserved and principally served for the description. The piece is 3.8 mm. long with a maximum 224 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV diameter of 1.6 mm. which is very slightly exceeded by one other specimen. Head an irregular knob-like enlargement forming an angle with the body axis of about 45°; slightly compressed in caudal half but somewhat depressed forward where it tapers to the rounded pal- pode; length about twice greatest width and one and one-third greatest depth, both at caudal end. Limbus obsolete except for a slight transverse fold that remains of the posterior portion and extends across the dorsum at the boundary between the peristom- ium and somite II and a short flange at each side of the broad, flat, semicircular palpode, Keel high, narrow, prominent, uniform, reaching from palpode to end of middJe-third of head, where a faint furrow encircles the latter. Nuchal organs deeply incised, narrowly >-shaped, the medial limb close to and parallel with the keel, the lateral limb about 3 as long and nearly parallel with the margin of the head. Mouth large for a maldanid, crescent-shaped, with a cushion-like upper lip occupying an elliptical depression. Other specimens have the head somewhat more contracted and forming an angle with the body slightly greater or less than the type, and nuchal organs forming a somewhat wider >. Somite II separated from the head by a faint furrow only, elongated and slender, length four to four and one-half times and diameter two-thirds head, strictly cylindrical, not distinctly divided into two annuli but marked by numerous faint encircling lines, sete fascicles close to anterior end. Somite IIT is of slightly greater diameter than II and one-half (in some of the cotypes) to three-quarters (in the type) the length of II. One-fifth of this length is of the collar which is slightly oblique, with the dorsal margin less produced and somewhat emarginate. Otherwise its margin is perfectly entire and smooth and it closely embraces the slightly contracted caudal end of II. IV is similar to III which it slightly exceeds in diameter, but is somewhat shorter. It bears a similar but slightly lower collar and differs from III in the thick glandular zone that covers its cephalic two-thirds. Both III and IV, but especially the former, are very readily detached. The remaining four segments of the type lack collars, but the slightly projecting anterior glandular margins somewhat embrace the preceding segment laterally. V is the shortest, being about three-fourths as long as IV, while VI, VII and VIII each nearly equals III. All of these have the anterior end to and including the tori thickly glandular, except in the dorsi-meson, and the slight lateral lips embracing the preceding segment. On the first two setigerous segments the fascicles lhe close to the anterior end; on the others somewhat cephalad of the middle. The first four (II-V incl.) bear sete only, the others both setz and uncini, the sete fascicles on the latter being larger and the tori low and narrow. 1923] NATURAL SCIENCES OF PHILADELPHIA 225 « The setz are numerous and arranged in two rows in the large fascicles. All are of one type, colorless, with bilimbate ends much like those of Notoprotus but more slender and elongated. The uncini (Plate X VIII, fig. 30) are small and numerous, upwards of 100 on a detached segment of unknown number. They are arranged in two facing and interlocking series and resemble those of certain terebellids (Pista). A few segments of tube (the largest 70 mm long) have a diameter of 2.3 mm. and are of a deep-brown color, horny, laminated and friable. One tube is thinner and orange-colored. All specimens come from the vicinity of Cape Pinos, Monterey Bay, on bottoms mostly of gray but occasionally of green mud and at depths varying from 75 fathoms (station 4523) to 766 fathoms (station 4517). Stations 4508, 4510, 4517, 4523, 4524, 4526, the last yielding the type and two cotypes. Praxillura maculata sp. nov. Plate XVIII, figs. 31, 32. Head, including the small posterior peristomial annulus, one and two-thirds times as long as deep. Profile gibbous, continuing direction of anterior segments for caudal three-fourths of dorsum, then dropping at right angles for slightly more than one-half depth of head and then again bending sharply forward as a broad pro- jecting lip. There is no trace of a cephalic limbus and the region of the disk is much reduced, consisting of a depressed area on the steep frons bounded by the lp below, slight, cheek-like swellings laterally and a slight frontal prominence above. Within this area, occupying the steep portion of the profile, is the very short low median carina, scarcely longer than broad, separated by faint transverse grooves from the lip below and the frontal prominence above and bounded laterally by the longitudinal limbs of the nuchal organs. Nuchal organs rather distinct, each consisting of two limbs of approximately equal length, one longitudinal, straight, and bounding the carina, the other diverging laterad and cephalad at an angle of about 110° and slightly curved. On the caudal part of the head a small annulus is rather distinctly cut off and there are a number of irregular transverse furrows. Mouth very large, occupying most of the ventral surface of the head and bounded by loose wrinkled lips. No eye-spots can be detected. Anterior setigerous segments very short, the first two together about equal to the total length of the head. They increase gradually and by VIII or IX the length equals the diameter. These segments are separated by deep furrows and are strongly biannulate, the anterior setigerous ring being three times the length of the posterior. The first four or five are rather strongly gibbous at the sides ventral to the sets but this condition soon disappears At XIII 226 PROCEEDINGS OF THE ACADEMY OF [Vo]. LXXV the annuli become relatively longer and from this point to XX the segments are slightly longer than wide; beyond XX to the end of the piece (X XVII) they are more slender and about 50% longer than wide, but this region is somewhat distorted. Intersegmental furrows also disappear at XX and the tori shift to the caudal region on XXI. Pygidium unknown. The first seven setigerous somites bear stout spines, the others crochets in tori, though the first four pairs of tori (IX to XII inel.) are indistinct as are also the glandular areas On XIII both are well developed and on XIV prominent, the tori forming conspicuous ventro-lateral swellings and the glands complete whitish zones, which ventrally and laterally cover all of the somite anterior to and including the parapodia and dorsally are reduced to a narrow band. After XX the glandular zones become narrower and shift with the tori caudad. Somites II to VIII bear small lateral tufts of setee and immedia- ately ventral to them one or two stout spines At XIII definite tori with crochets begin, while 1X to XII are intermediate, bearing two to five transitional, nearly sessile crochets. The number of crochets is always small, being on middle segments 9 to 11, arranged in a single row. Setze of anterior bundles are of two forms, most of them small, narrowly bilimbate and very slender lanceolate, the others longer and lacking margins altogether. Further back they all tend toward the latter type, the limbate sete being reduced both in number and distinctiveness. At the caudal end, while the number of sete is not increased, the length of individual sete is about doubled, resulting in much greater prominence of the fascicles. These posterior sets are very slender, straight and smooth, except at the tip where fine asperities cause them to become coated with foreign matter. All notopodial setz are colorless and exhibit only the very faintest internal striations. Anterior spines (Plate X VIII, fig. 31) are of a deep brownish-yellow color, strongly striated internally and all more or less stout, tapering towards the ends and slightly curved. Most of them have weak claw-like tips but some are nearly straight and simply taper to blunt points. From XIII at least crochets are all of one kind; stem and shoulder cannot be well made out in the preparation but the exposed part as shown in figure 32 bears a stout beak and a crest of four main teeth with the usual lateral brush and a broad guard divided in halves, each ending in a frayed filament. The cephalic end, including the head and segments to XIII, bears a conspicuously maculated pattern of small rounded or somewhat irregular brown spots most numerous dorsally and anteriorly and gradually fading away ventrally and caudally. They present no definite pattern but it is noticeable that the largest spots are frequently arranged symmetrically on the dorsum 1923] NATURAL SCIENCES OF PHILADELPHIA 227 of the setigerous zone of the small annulus and in corresponding positions on the head, indicating that an annular or metameric pattern may prevail in life. Tube unknown. Type only. Station 4427, off Santa Cruz Island, 447-510 fathoms, black mud, rocks. “ Nicomache carinata Moore. Fifteen specimens of various sizes agree fully with the types in form, sete and color, the only differences being in such proportions of segments etc. as would result from different degrees of contraction. The number of short subequal cirri on the pygidial funnel varies from fourteen to twenty-one, eighteen being the most frequent number. Some specimens are filled with eggs or sperm. Several tubes attached in a mass to a stone are almost horny with a covering of sand. Stations 4325, off Pomt La Jolla, 243-280 fathoms, soft green mud; 4411, off Santa Catalina Island, 148-245, fine gray sand and shells; 4415, off Santa Barbara Island, 302-638 fathoms, green mud; 4421, off San Nicolas Island, 229-298 fathoms, gray mud; 4423, same locality, 216-339 fathoms, gray sand and shells; 4430, off Santa Cruz Island, 197-281 fathoms, black sand, pebbles and rock; 4574, off Cape Colnett, Lower California, 1400 fathoms. Leichone borealis Arwardson. Two fragments measuring 1.7 mm. and 2.5 mm. in diameter consist of the head and 8 and 9 segments respectively. As far as represented they are indistinguishable from L. borealis. Station 4352 only, off Point Loma Lighthouse, 549-585 fathoms, green mud. Pseudoclymene longiceps sp. nov. Plate XVIII, figs. 33. 34. The type consists of head and twelve setigerous segments. Prostomium and peristomium completely united, their bound- aries indicated by a faint ventral half-furrow, the dorsal end of which is joined by a scarcely better defined longitudinal furrow reaching to postcephalic furrow I/II. Anterior cephalic angle about 50° (45° in a cotype). Cephalic plate elongated, oval, one and three-fourths as long as broad, the greatest width being at the end of the first third, tapering to a narrow caudal end which reaches almost to the furrow I/II and is marked by five transverse furrows. Limbus low but firm, of uniform height and with smooth entire margin; the posterior half erect, the anterior flaring; no 228 PROCEEDINGS OF THE ACADEMY OF [Vol. LXXV definite lateral incisions, the only interruptions being the anterior median opening through which the small, tongue-like palpode projects and the faint irregular notches, or in one specimen crenu- lations, which correspond with the cross-furrows on the disk. No true median carina, the well defined area of one-fifthof the width of the disk between the nuchal organs being not at all elevated. Nuchal organs well defined, one-fourth length of cephalic plate, with exception of a slight curvature at anterior end almost per- fectly straight. Mouth a relatively small slightly crescentic slit, far forward near end of head, with raised slightly rugous lips. Somite II cylindrical, about one-fourth longer than head, diameter one-half length, smooth, undivided into annuli and lacking conspicuous glandular areas. The next three segments are evi- dently contracted and distinctly shorter than II; VI is longer than V and VII still longer, equalling II; VIII equals the head and II combined; IX and X are united, without dividing furrow; XI is slender and much elongated, approaching the combined length of IX and X. Two other specimens agree with the type in these proportions; a fourth has the posterior somites more elongated and the furrows obsolete after VIII/IX. All segments are uniannu- lar. From III to IX, they have proparapodial glandular zones, those on VII and VIII being best developed. Somite V bears a high membranous collar which closely embraces IV and except for slight emarginations (which in one specimen become distinct notches) at the level of the seta fascicles are quite entire and of even height. On another specimen faint lateral and ventral impressions give the collar a slightly trilobate character, the dorsal lobe being a little the longest. Somites III, IV, VII, VII! and to a slight degree IX, exhibit false collars due to the retraction within their anterior ends of the preceding segments. These folds are thicker and evidently double reduplicatures of the skin instead of true collars. Although more or less indicated on all anterior segments, pro- parapodial glandular zones are conspicuously developed on VII, VIII and IX only; on these they are complete and occupy the entire region cephalad of the sete. Definite parapodia are lacking on II, III and IV, which bear a dorsal tuft of sessile setee and a single stout ventral spine each. Remaining somites bear tori, which from V to IX inclusive, are anterior and on succeeding somites posterior in position. Each bears a long row of crochets occupying as much as one-fifth or even one-fourth of the circumference and dorsal to it a flattened lappet with a prominent tuft of sete. The number of crochets varies from 9 to 14 on V, is about 30 on VIII to X, and 40 or more on XII. On II to IV, the sete are arranged in a vertical line of two ranks, one of small and one of longer slender, capillary, narrowly bilim- 1923] NATURAL SCIENCES OF PHILADELPHIA 229 bate and smooth sete and ventral to them a single, stout, yellow, blunt and internally fibrous spine (Plate X VIII, fig. 33). Beginning with V, the sete remain as before but the spine is replaced by a single series of slightly curved, pale-colored crochets (Plate XVIII, fig. 34), with a rather weak curved beak, a low crown of three or four principal teeth and a secondary flanking series of fine ones on each side; guard of three or only two filaments on each half. They gradually change in form as they increase in number and by VIII are strongly curved, with a stout and nearly straight beak, a high crest of six or seven teeth of diminishing size and the secondary teeth nearly obsolete. As posterior segments are lacking and most. of the sete of anterior segments are broken, it is impossible to determine if any serrate or spiral sete exist. The natural colors have faded, but the head and first three segments are ashy, the rest light or dark brown and the glandular zones whitish. One specimen has the anterior segments marked with quadrate black spots. Portions of tubes are thick and firm, composed mostly of large sand-grains of various colors, closely and securely fitted together with little hard cement. Stations 4427, off Santa Cruz Island, 447-510 fathoms, black mud; 4464, off Santa Cruz Lighthouse, 9-10 fathoms, rocky; 4556, off Point Pinos Lighthouse, 56-59 fathoms, rocks (type). Heteroclymene glabra sp. nov. Plate XVIII, figs. 35, 36. A species very imperfectly known through a single anterior end consisting of the head and eight setigerous segments; measuring 22 mm. long and 1.2 mm. in diameter. Owing to the faintness of the furrow I/II the head and first setigerous segment have a continuous tapering outline, of which somite II contributes about four-sevenths of the length. Cephalic plate inclined at an angle of less than 45°, the center deeply de- pressed below the limbus which exhibits a sigmoid profile and nearly circular outline. Limbus with high, prominent, lateral lobes, slightly auriculate anteriorly, the posterior lobe lower and stiffer, with a deep median notch and slightly crenulated margin. Carina low, flat, straight, about three-fourths length of cephalic plate, contracted in the middle and slightly widened at both ends, the anterior terminated by a small blunt-pointed palpode set in a notch between the lateral lobes. Nuchal organs very narrow slits almost as long as the carina and nearly straight with a very sight lyriform curvature. Mouth prominent, crescentic, with large furrowed lip. Prostomium with no marked characters. Somite IT about one-third longer than head, tapered to contracted caudal end, smooth, with a faint anterior glandular zone and neural groove; III is similar as is IV also, except that it is only as 230 PROCEEDINGS OF THE ACADEMY OF [Vol. LX XV long as the head. Parapodial areas on all three are anterior and consist of a dorsal line of setze and a single ventral spine, both sessile. Somite V is as long as IV, cylindrical, much darker in color than the preceding segments; VI, VII and VIII are similar, except that the latter passes into [X without any furrow. Beginning with V, there is a short dorsal line or tuft of seta and a ventral transverse series of crochets. On V to VIII the set are at the middle, on IX near the caudal end, though owing to mutilation it is impossible to determine the exact length of the latter. None of these segments exhibits clearly marked glandular areas. Notopodial sete form dense flat fascicles of moderate size and appear to be alike on all segments, though most of them are broken. They are simple, colorless, alimbate, very slender, capillary, tapering and smooth. Spines (Plate XVIII, fig. 35) on anterior segments (II to IV), much smaller than in related species. They are relatively slender, nearly straight, except near the end where there is a slight bend below the blunt point, pale yellow and faintly striated. Crochets (Plate XVIII, fig. 36) about fifteen or twenty in each series, small and slender, with curved, tapering stem, shoulder and neck only slightly marked and head but little bent back, with acute beak at right angle to shaft and depressed crest of four rather acute teeth of diminishing size and a lateral brush; guard weak, of about eight slender, short filaments. Station 4326, off Point La Jolla, 243-280 fathoms, soft green mud (type only). Euclymene reticulata sp. nov. Plate XVIII, figs. 37, 38. Described from the type only, a large example consisting of the head and nine setigerous segments, measuring 52 mm. long and 4.5 mm. in diameter. The head and first setigerous segment are completely united into a single piece twice as long as III, somewhat depressed, dis- tinctly widened in the middle and contracted slightly, both im- mediately behind the cephalic plate and at the furrow II/III. Cephalic plate forming with the body axis a dorsa! angle of about 45°, with semi-erect limbate margins, which, with the depressed center, give a general saucer-like effect. The margin of the limbus is smooth and entire, except for an anterior interruption from which the palpode protrudes, a posterior median notch and a pair of larger lateral notches about one-third of the length from the caudal end; the limbus anterior to these being wider and more flaring, posterior stiffer and more erect. Central disk oval, widest at the lateral notches, one and one-third times as long as wide, and marked by a few wrinkles. Carina low and rounded but well marked, long and straight, of nearly uniform width and about three-fourths length of central disk or two-thirds length of entire cephalic plate. 1923] NATURAL SCIENCES OF PHILADELPHIA 231 Nuchal organs perfectly straight deep slits bounding carina for entire length and ending anteriorly at each side of the small rounded palpode. Mouth small, far forward, bounded by a slightly wrinkled anterior lip continuous with the ventral side of the palpode and a crescentic hind lip. Peristomium in no way separated from the prostomium and from II only by a slight constriction anterior to its sete and pre- ceded by an enlargement. What is considered to represent II is a simple segment widest anteriorly and tapering slightly caudad and as long as prostomium and peristomium combined; III is similar, but slightly shorter. Somites 1V to [X inclusive are strongly contracted short cylinders, separated by well-defined furrows and lacking glandular zones or other conspicuous features; X is again longer, equalling VIII and IX combined. The head and somite II, except at the extreme caudal end, are ornamented by a conspicuous finely reticulated pattern of raised lines and depressed areas like chased work on metals. This is somewhat faintly indicated on succeeding segments, but on these annular lines predominate. From VI to IX, the segments are quite smooth; X is marked with transverse wrinkles and the surface is softer. Setigerous tubercles are situated toward the anterior ends of the segments from II to VIII inclusive, at the middle on IX and posteriorly on X. Except on II the tubercles are remarkably elongated and conspicuous. II, III, and IV each bear a single large ventral spine. The tori on following segments are all small and inconspicuous and bear few crochets; 6 on V, 8 on VI, 18 on VIII, and 26 to 35.on X. Capillary setz have the usual arrangement but are uncommonly numerous. Unfortunately all bundles are broken and no intact setz could be found. Neuropodials on IJ, III and IV consist of one or rarely two stout, deep-yellow fibrous spines, crooked at the tip and with slight indications of teeth when unworn. (Plate XVIII, fig. 37.) Few crochets are intact. The stems are long, slender and strongly curved, the shoulder slight, neck rather strongly marked but swelling rapidly into the broad thick head, with thick, ample crest of five transverse rows of teeth; beak rather short and stout; guard moderately developed, of seven slender filaments on the only one intact (Plate XVIII, fig. 38). Caudal end and tube unknown. Stations 4337, off Point Loma Lighthouse, 617-680 fathoms, green mud (fragment consisting of a few segments only); 4482, off Santa Cruz Lighthouse, 48-44 fathoms, hard green mud (type). Euclymene delineata sp. noy. Plate XVIII, figs. 39, 40. The type consists of a head and ten setigerous segments measuring 29 mm. long and 1.6 mm. in diameter.