CRYPTA. 



369 



the shells which remain concealed in the sand ; they 

 often live in groups, attaching themselves to the outside 

 of each other's shells. 



Species of 



adspersa, Dkr. 

 adunca, Say. 

 arenata, Brod. 

 calyptraeiformis, Desk. ' 

 Capensis, Quoy. 

 cerithicola, C. B. Adams. 

 contorta, Quoy and Gaim. 

 convexa, Say. 

 costata, Soiv. 

 costellata, Dkr. 

 excavata, Brod. 

 fornicata, Linn. 

 Goreeusis, Gmel. 

 grandis, Midd. 

 incurva, Brod. 

 lineolata, Desh. 



Crypt a. 



lingulata, Gould. 

 margiualis, Brod. 

 minuta, Midd. 

 Moulin sii, Mich. 

 nivea, C.B. Adams. 

 onyx, Soiv. 



osculans, C. B. Adams 

 patula, Desh. 

 porcellana, Linn. 

 Peruviana, Lam. 

 rostrata, C. B. Adams. 

 rugosa, Nutt. 

 Rusei, Dkr. 

 Sitchana, Midd 

 solida, Hinds. 

 strigellata, Dkr. 



Sub-geu. CREPIPATELLA, Lesson. 



Internal lamina rounded, produced ; apex of shell lateral, 

 incurved, sub-terminal. 



aculeata, Chem. 

 Adolphei, Less. 

 dilatata, La?n. 

 dorsata, Brod. 

 echinus, Brod. 



hepatica, Desh. 

 hystrix, Brod. 

 pallida, Brod. 

 rugulosa, Dkr. 

 strigata, Brod. 



Sub-gen. ianacus, Morch (not Inachus, Rising, or Fahr.). 

 Shell depressed ; apex postical, laterally inclined ; internal 



VOL. I. 3 B 



