INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 623 



New Haven to Wood's Hole and Casco Bay, under' stones in the 

 upper part of tbe fucus-zone, and nearly up to high-water mark. 



The above description was made from living specimens taken at Savin 

 Eock, near Xew Haven. 



Some of tbe 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 sette, which are slightly curved in the form of 

 an italic/, and are subacute, not bifid at tips. At the ninth to twelfth seti- 

 gerons segments a thickening occurs, forming a clitellas ; on the ninth 

 segment the seta? are replaced by a small mammiform, bilobed organ;, 

 on the tenth there is a i^air of prominent obtuse papilhe, swollen at 

 base. On the posterior segments only two sette 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 c:iecal tubes, forming about two loops on each side, were no- 

 ticed. Length, about 35'"'". 



LuMBRicuLUS TENUIS Leidy. 



Marine luvertebrate Fauna of Rhode Island and New Jersey, p. 16 (14*), Plate 

 11, fig. 64, 1855. 



Point Judith, Khode 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. Setre 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 ciecal 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 ciecal lobes, there are numerous convo- 

 lutions of slender tubes. The blood-vessels running along the intes- 

 tine contain a colorless fluid. 



Halodrillus littoralis Yerrill, 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 

 setae commence with four fascicles on the first segment behind the buc- 

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

 of four to six set;!?, the middle setie being longer than the upper and 

 lower ones; posteriorly the setse are less numerous. Caudal segment 



