[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 facus-zone, and nearly up to high-water mark. 
The above description was made from living specimens taken at Savin 
Rock, near New Haven. - 
Some 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 sete, which are slightly curved in the form of 
an italic f, 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 setz are replaced by a small mammiform, bilobed organ; 
on the tenth there is a pair of prominent obtuse papilla, swollen at 
base. On the posterior segments only two seta 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 cxcal tubes, forming about two loops on each side, were no- 
ticed. Length, about 35™™. 
LUMBRICULUS TENUIS Leidy. 
Marine Invertebrate Fauna of Rhode Island and New Jersey, p. 16 (148), 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 colorless. Seta 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 
setee commence with four fascicles on the first segment behind the bue- 
cal; the setz are slightly curved, forming rounded, fan-shaped fascicles 
of four to six sete, the middle sete being longer than the upper and 
Jower ones; posteriorly the sets are less numerous. Caudal segment. 
