222 



subovate, attached to dead leaves, each containing 

 four to twelve ovoid eggs. They are hatched at the 

 end of twenty or twenty-one days. 



Angenville (Zoom. i. 8. f. 11.) erroneously repre- 

 sents the head of the animal as appearing beyond the 

 edge of the shell. 



M. Michaud has described a specimen, which has a 

 sinus on the front edge (most probably caused by the 

 animal having lived on a stone which had a promi- 

 nence), under the name of Ancylus sinuosus. (Compl. 

 90. t. 16. f. 1, 2.) 



A. sinuatus, A. Traysianus Dupuy, and A. bireflexus 

 Bourgegnart are distortions of a similar kind. 



*** Tentacles compressed, scarcely raised; eyes far 

 back ; jaws single (?) ; shell ovate, subspiral, 

 marine. (Otinina.) 



5. OTINA Gray. 



Animal rather large for the size of the shell, white, 

 very glutinous ; head depressed ; tentacles very 

 short, broad, compressed, several raised; eyes 

 large, sessile, rather close together on the nape ; 

 labial palpi large, nicked in the middle; foot 

 rather large, produced and nicked in front, not 

 extending behind ; the shell behind divided in 

 two parts by a transverse medial groove ; mantle 

 inclosed ; the lingual membrane broad, oblong, 

 rounded in front ; teeth almost sixty in each cross 

 row, and almost a hundred rows all similar, ob- 

 long-elongate, four-sided, close together ; apex 

 recurved, produced into a conical tooth ; jaws 



