PULMONARY GASTEROPODS. 



429 



In the casque, Cassis, the shell is oval, convex, and the spiral of con- 

 siderable height. The longitudinal opening narrow, terminating in 

 front in a short channel, which becomes suddenly erect towards the 

 back of the shell, as in Cassis glauca (Fig. 271), a fine shell from the 



Fig. 271. Cassis glauca (Linnaeus). Fig. 272. Cassis rufa (Linnaeus). 



Fig. 273. Cassis canaliculata 

 ( Brugieres). 



Moluccas. The columella is folded or toothed transversely, as in 

 Fig. 272 (Cassis rufa) ; the right edge thick, furnished with a sort 

 of pad externally, and dentate within. This shell is from the Indian 



Figs. 274 and 275. Cassis Madagascariensis (Lamarck). 



Ocean, and is of a fine purple colour, varied with black above ; the 

 edges of the opening being of a coral red colour, the teeth alone being 

 white. 



