[599] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 305 
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 branchie first appear on the sixteenth setigerous segment 
as small papille ; 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 buecal the “ feet” are 
represented by a very small, slightly-elevated lobe, above and below, 
‘each bearing a dense fascicle, that of the lower ramus widest, but the 
length of the setze about equal in both. On the fourteenth segment a 
small tubercle appears on both rami; on the sixteenth these become 
elongated and somewhat cirriform, and the setz become considerably 
longer on the fifteenth segment. At about the seventeenth segment the 
lower ramus becomes distinetly 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 upper ramus is long 
and ligulate, like the branchiz, and the set 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 setz 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-color, 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, perhaps, to ova 
contained within the body; there are sometimes two obscure brownish 
spots on the upper side of the head. 
Length up to 125™"; diameter, 3™™. 
Great Egg Harbor, New Jersey; New Haven; Watch Hill; Wood’s 
Hole; in sand, between tides, and gregarious. 
ANTHOSTOMA ACUTUM Verrill, 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 indistinet reddish spots above, resembling imperfect ocelli. The 
branchiz commence at the eleventh setigerous segment as small dorsal 
papillz, 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 sete, 
with a very small papilliform lobe above it, and a lower ramus, consist- 
ing of a small prominent papilla, with a fascicle of slender sete, much 
larger than the upper one. On the fourteenth and succeeding segments 
