INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 599 



very long and slender, tapering gradually, flattened dorsally. Head. 

 distinctly annulated, elongated conical, very acute, with the tip slender 

 and translucent ; proboscis short and broad, not extending far beyond 

 the tip of the head, with six or more broad, convoluted, changeable 

 lobes, which are united at the base by a broad membranous expansion. 

 The dorsal branchiiDe first appear on the sixteenth setigerous segment 

 as small papillae ; they become well developed and long ligulate at about 

 the twentieth, increasing somewhat in length on the segments farther 

 back. On the first thirteen segments behind the buccal the " feet" are 

 represented by a very small, slightly-elevated lobe, above and below, 

 each bearing a dense foscicle, that of the lower ramus widest, but the 

 length of the setiie about equal in both. On the fourteenth segment a 

 small tub'ercle appears on both rami ; on the sixteenth these become 

 elongated and somewhat cirriform, and the setse become considerably 

 longer on the fifteenth segment. At about the seventeenth segment the 

 lower ramus becomes distinctly tri-lobed, and at the twentieth four- 

 lobed, with the setigerous lobe bifid, and the two lower lateral lobes 

 conical, acute, and swollen at the base ; while the npper ramus is long 

 and ligulate, like the branchiae, and the set?e are long and slender, the 

 lower fascicle smallest. Farther back the lobes of the lower ramus be- 

 come still more developed, but keep their acute conical form, and the 

 upper ramus and setce continue to elongate until, on the posterior part 

 of the body, they exceed in length the diameter of the body. Anal seg- 

 ment oblong, sub-cylindrical, smooth, with two long filiform cirri on the 

 upper side; color, when living, brownish orange, dull yellow, ocher, 

 light reddish, or flesh-<iolor, with a red median dorsal line, and some- 

 times with the dorsal surface tinged with red posteriorly : a narrow, 

 light ventral line, bordered with reddish. Sometimes the upper surface 

 is maculate with fine polygonal, whitish spots, due, i)erhaps, to ova 

 contained within the body; there are sometimes two obscure brownish 

 spots on the upper side of the head. 



Length up to 125™°i ; diameter, S'^^. 



Great Egg Harbor, Xew Jersey; ISTew Haven; Watch Hill; Wood's 

 Hole ; in sand, between tides, and gregarious. 



Anthostoma acutum Yerrill, sp. nov. (p. 501.) 



Body long and quite slender, tapering most toward the head, and 

 very gradually posteriorly. Head very acutely pointed, with two 

 rather indistinct reddish spots above, resembling imperfect ocelli. The 

 branchiae commence at the eleventh setigerous segment as small dorsal 

 papillae, and become prominent on the thirteenth ; on the succeeding 

 segments they become long and ligulate. Anteriorly the feet are rep- 

 resented by an upper ramus, consisting of a very small tuft of setae, 

 with a very small papilliform lobe above it, and a lower ramus, consist- 

 ing of a small prominent papilla, with a fascicle of slender setae, much 

 larger than the upper one. On the fourteenth and succeeding segments 



