no 



GASTROPODA. 



Pkiline (Ascan.). Shell fragile, translucent, 

 white when dry, oval ; aperture very wide ; 

 animal investing the shell ; slug-like ; head oblong, 

 four-sided ; no eyes ; foot broad, with large side- 

 lobes. 



P. aperta. Fig. 155 ; n.s. 

 quadrata. 

 scabra. 

 catena, 

 punctata, 

 pruinosa. 



156 



157 



Scaphander (Montfort). Shell oblong, or ovate, 

 rolled ; spirally striated ; spire concealed ; aperture 

 wide in front ; covered by a thick epidermis. Ani- 

 mal with a large head ; eyeless ; foot short and 

 broad; side-lobes turned up, but not enveloping 



the shelL 



S. lignarius. Fig. 156 ; \n.s. 



AmpMsphyra (Loven). Shell small, thin, ovate, 

 truncate, with a long aperture, and a minute spire. 

 Animal wholly retractile within the shell ; head 

 wide, with triangular tentacles ; two minute sunken 

 eyes. 



A. hyalina. Fig. 157 ; n. s. 



