[623] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 329 
New Haven to Wood’s Hole and Casco Bay, under stones in the 
upper part of the fucus-zone, and nearly up to high-water mark. 
The above description was made from living Spetimens taken at Savin 
Rock, near New Haven. 
Bane of the specimens obtained at Wood’s Hole appear to differ some- 
what from this description, but the differences may be chiefly due to 
their being taken in the breeding season. In these the anterior fasci- 
cles consist of two short sets, which are slightly curved in the form of 
an italic /, and are subacute, not bifid at tips. At the ninth to twelfth seti- 
gerous segments a thickening occurs, forming a clitellus; on the ninth 
segment the setie are replaced by a small mammiform, bilobed organ ; 
on the tenth there is a pair of prominent obtuse papilliw, swollen at 
base. On the posterior segments only two sets were observed in each 
of the four fascicles, but they were longer, more slender, and more 
curved at the tip than the anterior ones. In each of the segments 
slender cecal tubes, forming about two loops on each side, were no- 
ticed. Length, about 55™™, 
LUMBRICULUS TENUIS Leidy. 
Marine Invertebrate Fauna of Rhode Island and New Jersey, p. 16 (143), Plate 
11, fig. 64, 1855 
Point Judith, Rhode Island, abundant about the roots of grasses on 
the shore of a sound (Leidy). We did not obtain this species. 
HALODRILLUS Verrill, genus nov. 
‘Body long and slender. Blood white or coloriess. Sets small, acute, 
in four fan-shaped fascicles on each segment. The, alimentary canal 
consists of a pyriform pharynx, followed by a portion from which sev- 
eral (five to seven) rounded or pyriform cecal lobes, of different sizes, 
arise on each side and project forward and outward; these are followed 
by a large two-lobed portion, beyond which the intestine is constricted 
then thickened and convoluted, and covered with polygonal, greenish, 
glandular cells, which become fewer farther back, where the intestine. 
becomes a long, narrow, convoluted tube. -In the anterior part of the 
body, around the stomach and cecal lobes, there are numerous convo- 
lutions of slender tubes. The blood-vessels running along the intes- 
tine contain a colorless fluid. 
HALODRILLUS LITTORALIS Verrill, sp. nov. (p. 324.) 
Body round, slender, moderately long, tapering to both ends, but 
thickest toward the anterior end, tapering more gradually posteriorly. 
Head small, conical, moderately acute, or obtuse, according to the state 
of contraction; mouth a transverse, slightly sinuous slit beneath. The 
sete commence with four fascicles on the first segment behind the bue- 
cal; the sete are slightly curved, forming rounded, fan-shaped fascicles 
of four to six sete, the middle sete being longer than the upper and 
lower ones; posteriorly the setz are less numerous. Caudal segment 
