PROSORRANCHIATA. 



411 



eaters. Some kinds, however, as Natica, etc., are car- 

 nivorous. 



The Ilolostoma are the Naticidse (Natica, Siyaretns, 



FIG. 566. 



Fro. 568. 



FIG. 567. 



Trivia eurnpea, Mout. 

 Britain. 



Cypra-a. Reduced. Indian Ocean. 



FIG. 5GO. 



Marginella inibrriilnln. Lam. 

 Reduced. W. Aliioa. 



FIG. 571. 



FIG. 570. 



Sigarehis haliotrtides, L. 

 West Indies. 



FIG. 572. 



Ovulum ovum, L. Reduced. 

 New Guinea. 



Jfatica triseriata. Say. 

 Coast of New England. 



FIG. 573. 



PyramideUa elegantissima, 

 Mont. Reduced. Britain. 



PyramideUa dolobrata, 

 Gmel. West Indies. 



etc., Figs. 571, 570); the Pyramidellidae (Pyrfimulella, 

 C/temmtsui, etc., Fig. 572) ; the Cerithiidae (Cerit/n'w/i, 



