Tank No. i,. 



Fig. 17. Tritoniiini nodiferiun (Triton's horn), V3 nat. size. p. 93. 



Fig. 18. Aplysia Hmacina (Sea-hare), V2 n^t. size. p. 94. 



Fig. 19. Uinbrella mediterranca , 

 1, 2 nat. size. p. 94. 



Fig. 20. Cassis sulcosa (Helmet-shell), 

 1/2 nat. size. p. 92. 



