APLYSIA.—Ptate VII. 
Species 532. (Fig. a, 6, Mus. 

1) (Copied.) 
Aptysia Lessont. Apl. testa dolabriformi, subrhom- 
hoided, ventricosd, tenui, pallidé subviridi, ad mar- 
gines fusch; mpice vix elevato, parvo, obtuso ; 
margine superiori lato, vix excavato, ad terminum 
cuneato; labio externo convexo; margine m- 
feriori late excavato; margine dorsali elevato, 
rectinsculo. 
Lessen’s Aptysta. Shell hatchet-shaped, subrhom- 
boidal, ventricose, thin, pale greenish, brown at 
the margins; apex slightly elevated, small; ob- 
tuse; upper margin wide, very little excavated, 
cuneate at the end; outer lip convex; lower 
margin widely excavated; dorsal margin elevated, 
rather straight. 
Rana. Hist. Nat. Aplys., p. 60, pl. 14. 

Hab. Payta, Peru. 
