NON-PULMONARY GASTEROPODS. 
425 
Mitra papaMs (Fig. 261) lias dentiform folds round the opening, 
"Fidi also crown each turn of the spiral ; the spots are smaller, 
a,1 'l much more numerous and varied in form than those of M. 
e piscopalis. 
In the casque Cassis, the shell is oval, convex, and the spiral of con- 
•S-262. Cassis glauea (Linnteus). Fig. 263- Cassis rufa (Linnaus). Fig. 264. Cassis canaliculaiu 
(Brugibres). 
8l derable height. The longitudinal opening narrow, terminating in 
front in a short channel, which becomes suddenly erect towards the 
^ ac k of the shell, as in Cassis glauea (Fig. 262), a glaring grey shell 
Figs. 265 and 266. Cassis Madagascarionsis (.Lamarck). 
p 
l °m the Moluccas. The columella is folded or toothed transversely, 
as in Fig. 263 ( Cassis rufa ) ; the right edge thick, furnished with a 
of pad externally, and dentate within. This shell is from the 
