PROSOKRANCHIATA. 



413 



(Turbo, Trochus, etc., Fig. 586); the Ilalioticlas (ILi- 

 liotiSj Jantliinn, etc., Fig. 58T, 588) ; the Fissurel- 

 lidae (Fissurella, etc., Fig. 501) ; the Calyptrseidse 

 (Calyptrcea, Crepidula, etc., Fig. 589, 502) ; the Patel- 

 lidre (Patella, Aemcea, etc., Fig. 59u) ; the Dentalidae 

 (Dentalium, Fig. 504); and the Chitonidge (Chiton, 

 Fig. 593). 



FIG. 580. 



Valvatn tricnrinata, Say. 

 United States. 



FIG. 581. 



Lacuna vincla. 

 North AtJautic. 



FIG. 583. 



Liltorina pnlli- 

 ata, Say. 



FIG. 582. 



Paludina intcgra. Say. 

 United States. 



FIG. 534. 



Neritina zebra, Brug. Nerita, ustufata, L. 

 Pacific. Sciurte. 



FIG. 586. 



FIG. 587. 



Trochus zisyphinus, L. Britain. 



Haliotis tiilifrrulata, L. 

 Britain. 



