1 Ckiior. echimuus. 



2 I schnochiUm conspicuus. 



CHITONS AND BUBBLE SHELLS 



3 BuOa udmUfsa. 5 Apluslrum apluslre. 7 H ■•dating albo-cincla. 9 



4 Bulla ampulla 6 Atys Naui^um. 8 Haminea i-irescens (.body extended). 10 



Hydatinn albo-ckuta. 

 Hydatina pkysis. 



