143 
Grnus.—LAPLYSIA. 
* Shield dorsal, subcartilaginous, semicircular, ad- 
hering by one side and covering the branchial 
cavity. 
A. Depizans. Lin. 1082.—Pen. 4. p. 42. ¢. 21. f. 
21.—A. Hypripa. Sow. Brit. Misc. t. 53.—F. p. 
290.—Animal purplish with black spots; shell amber 
brown. On sea-weeds alittle beyond low water mark. 
A. Punctata. Cuv. Moll. ¢.1.f. 3, 5.—Flem. Ed. 
Ene. 14. p. 623.—F. p> 291.—Animal brown with 
white spots. Bay of Kirkwall, Scotland. 
A. Viripis. Mont. Lin. T. 7. t.'7. f. 1.—B. p. 291. 
—Animal green; no shell. Devon. 
TripeE.—COLIMACEA. 
Spiral, but without any exterior projections except the 
strice of growth ; outer lip frequently reflected ; no 
. real operculum. 
* Tt is scarcely if at all possible to distinguish Aplysia 
by the shells. 
