90 CONCHOLOGY. 



B. hydatis. B. ampulla. 



B. rugosa. B. lignaria. 



B. fasciata. B. solida. 



B. striata. B. cornea. 



*B. Wyatii. B. lactea. 



FAMILY V. 



Apltsiacea. Two genera. 



1. Genus Dolabella. PI. X. 



Jnimal. Body creeping, oblong, narrowed in front ; and pos- 

 teriorly widened; area round, sloping and truncated obliquely; 

 margins folded over the back ; four tubular tentacula, disposed 

 in pairs ; bronchial operculum inclosing a shell, orifice dorsal, 

 near the branchiae. 



Shell. Oblong, slightly arcuated, thick, callous, and somewhat 

 spiral, on both sides, singular in formation, and its characteristic 

 unlike most other shells. Inhabits the Isle of France. Two 

 species. 



Dolabella Rumphii. Dolabella fragilis. 



2. Genus Aplysia. PI. X. 

 Animal. Body creeping, oblong, convex above ; bordered on 

 each side by a broad mantle, which covers the back when the 

 animal is in repose ; head and neck elevated, with four tentacula, 

 the two upper ones ear shaped, eyes situated near the mouth ; 

 dorsal shield simicircular, subcartilaginous, adhering on one side, 

 and covering the branchial cavity. 



Shell. Nearly round, left margin somewhat reflected; outer 

 lip acute ; yellowish horn colored, with brown radiations, and two 

 concentric bands. Inhabits the Indian seas. Thirty-seven 

 species, 



Aplysia depilans. Aplysia hassetlii. 



A. teremida. A. punctata. 



A. gigas. A. marmorata. 



