INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 32D 



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 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 ta 

 their being taken in the breeding season. In these the anterior fasci- 

 cles consist of two short setre, Which are slightly curved in the form of 

 an italic/, and are subacute, notjbifid at tips. At the ninth to twelfth seti- 

 gerous segments a thickening occurs, forming a clitellus ; on the ninth 

 segment the sette 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 setae 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 crecal tubes, forming about two loops on each side, were no- 

 ticed. Length, about 35 lum . 



LTJMBRICULUS TENUIS Leidy. 



Marine Invertebrate Fauna of Rhode Island and New Jersey, p. 16 (14?), 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 Yerrill, genus nov. 



Body long and slender. Blood white or colorless. Setse small, acute, 

 in four fan-shaped fascicles on each segment. The alimentary canal 

 consists of a pyriform pharynx, followed by a portiQu from which sev- 

 eral (five to seven) rounded or pyriform ca3cal lobes, of different sizes, 

 arise on each side and project forward and outward j 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 csecal 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 

 seta3 commence with four fascicles on the first segment behind thebuc- 

 cal ; the setae are slightly curved, forming rounded, fan-shaped fascicles 

 of four to six setae, the middle setre being longer than the upper and 

 lower ones 5 posteriorly the setae are less numerous. Caudal segment 



