143 



GENUS. LAPLYSIA, 



* Shield dorsal, subcartilaginous, semicircular, ad- 

 hering by one side and covering the branchial 

 cavity. 



A. DEPILANS. Lin. 1082. Pew. 4. p. 42. t. 21. /. 

 21. A. HYBRIDA. Sow. Brit. Misc. t. 53. F. p. 



290. Animal purplish with black spots ; shell amber 

 brown. On sea-weeds a little beyond low water mark. 



A. PUNCTATA. Cuv.Moll. t. I./. 3, 5.Flem. Ed. 

 Enc. 14. p. 623. F. p- 291. Animal brown with 

 white spots. Bay of KirJkwall, Scotland. 



A. VIRIDIS. Mont. Lin. T. 7. t. 7.f. l.E.p. 291. 



Animal green ; no shell. Devon. 



TRIBE. COL1MACEA. 



Spiral, but without any exterior projections except the 

 strice of growth ; outer lip frequently reflected ; no 

 real operculum. 



* It is scarcely if at all possible to distinguish Aplysisc 

 by the shells. 



