S3 
EMARG1NULA? s. PISSURELLA ? claihrata. 
TAB. DXI X.—jig. 1. 
Spec. Char. An elevated curved cone ; sides 
coarsely reticulated ; longitudinal ribs about 
six on each side, and one central, which is 
split more than half way down from the apex ; 
base oval ; apex bent almost down to the base. 
This little shell has the general form of Fissurella reti- 
culata, but is more curved : it is however in all probabi- 
lity generically distinct, for we have not met with a spe- 
cimen that has a notch in the margin ; on the contrary, 
the central rib is split for a considerable distance from 
the apex ; but as this does not appear to be perforated, 
but is acute, the propriety of referring the species to 
Emarginula is doubtful. 
