CHITONS AND BUBBLE SHELLS 



Chiton echinatus. 

 Ischnockiton conspicuu 



Bulla nebulosa. 

 Bulla ampulla. 



Aplustrum aplustre. 

 Aiys Nauciim. 



Hyd'ilina albo-rincta. 



Haminca vircscens (body extended). 



10 



Hydatina albo-cincta, 

 Hydatina physis. 



