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APLYSIAN^.— Two Genera. 



Aplysi^:. Shield dorsal, semicircular, subcartilaginous. 



A. depilans, 



' fasciata, 



' punctata, 



4 ecaudata, 



4 teremida, 



4 gigas, 



' dolabrifera, 



4 ascifera, 



4 petalifera, 



4 unguifera, 



Dolabella. Shell oblong, slightly arched, hatchet-shaped, contracted, 

 heavy, callous; almost spiral on one side, and larger, flatter, and thinner on 

 the other. 



A. bresili, 



4 dactycomela 



4 protea, 



4 sorex, 



4 tigrina, 



4 maculata, 



4 marmorata, 



4 kerandrenii, 



4 lessonii, 



A. camelus, 



' alba, 



4 napolitana, 



4 poliana, 



4 fusca, 



4 longicornis, 



4 virescens, 



4 ferrusacii, 



4 saviguana, 



pleii, 



citrini, 



undata, 



limacina, 



longicauda, 



viridis, 



rosea, 



leachii, 



hassetlii. 



D. Rumphii, 



D. frasilis. 



SECTION II. PNEUMOBRANCHI^. 



This section contains only one family, viz. Limaciana. 



LIMACIANA.— Five Genera. 



Onchidium. This genus has no shell. 



O. typhse, 



O. Peronii. 



Parmacella. Lamarck has given a description of the animal of this 

 genus, but only mentions that the scutcheon contains a shell, without de- 

 scribing it. 



P. Oliveri. 



Limax. Lamarck merely mentions that the animal is "furnished with a 

 coriaceous, subrugose shield." 



L. rufus, L. albus, L. cinerus, L. agrestis. 



Testacella. Shell very small, external, rather ear-shaped, slightly 

 spiral at its summit; aperture very large, oval, obliquely dilated, the left 

 margin involute. 



T. haliotideus. 



