884 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [6] 



II. — Only one kind of spines, viz, forked spines. 



1. Penis and oviducts not surrounded by spiral muscles. 



2. Penis and oviduct surrounded by spiral muscles. 



LiMNODRILUS, 



Camptodrilus. 



Gen. SPIEOSPERMA nov. gen. j 



i 

 (Fl. II and III ; Fig. a to ^.) 



The cephalic gangloin is furnished with a large conical frontal proceS^ 

 sus, which does not branch itself in the cephalic lobe. 



The posterior margin is concave. 



The spermatophores are long, narrow, and spirally coiled. 



The spines are of three kinds, viz, hair spines, forked spines, comb^ 

 like spines. 



The integument is covered with dark, convex papillsB. 



The whole of the atrium is glandular, no vesicula seminalis, and m 

 glands at the base of the receptacle. Of the forked spines we can ii 

 reality distinguish four varieties, with from two to four prongs. Thi 

 genus is one of the best characterized in the family. As yet only on 

 species known, viz : 



Spirosperma ferox*, n. sp. 



Nervous system. — The cephalic ganglion is cordate, conical in front 

 emarginated behind. The conical part is about as long as the rest oi 

 the ganglion. The posterior side-lobes are well rounded. The gan- 

 glionic cells are comparatively numerous and closely packed. {Fig. 



2 g.) 



Generative system. — The efferent duct is long and narrow, resembling 

 that of other genera except Ilyodrilus. The atrium is crescent-shaped, 

 its lower end long and narrow, and in some specimens terminating in a 

 helix-like swelling, situated immediately at the upper end of the penis 

 proper {Fig. 2h, li. s.). Penis projier has the form of a long and broad 

 cylinder, somewhat contracted at the middle, and with the lower end 

 terminating blunt. The upper half of the penis is surrounded by a 

 chitinous penis sheath, the upper and lower openings of which are 

 nearly of the same size. That part of the penis which is covered by the 

 sheath is of different structure than the lower free part. While the 

 former seems to be merely an unmodified part of the atrium proper, and 

 consisting of numerous small, massed cells, the latter, on the contrary, 

 is found to consist of very large, often angular cells, iiore regularly ar-j 

 ranged. The oviduct consists of a large, narrow-walled tube, or rather 

 sack, as it seems more muscular than chitinous, inclosing the penis and 

 its sheath to their whole length. Exteriorly the oviduct is surrounded 

 by longitudinal muscles, connecting the same to the body wall {Fig. 

 'J.h, nisc). The receptacles are of an enormous size, extending through 



