APLYSIA. -'^ ; > 



gigas, Rami. Teremidi, Bang. 



Hasseltii, Rang, truncate, Rang. 



scapula, Martyn. 



Genus DOLABRIFERA, Gray. 



Body tapering, with no disk on the hind part; gills 

 concealed. Foot with the lobes covering the hack, not 

 dilated for swimming. 



Shell internal, calcareous, trapeziform or sub-quadran- 

 gular ; apex produced. 



Syn. Petalifera, Gray. 



Ex. D. Cuvieri, H. and A. Adams, pi. 59, fig. 4. 

 Shell, D. Cuvieri, fig. 4, a. 



The body, in this genus, appears to want the trans- 

 verse, fimbriated crest, situated towards the hind part, 

 seen in Dolabella, and the shell, although calcareous, 

 is trapeziform with the apex produced, and not triangular 

 with a callous apex, as in the last-named genus. 



Species of Dolabrifera. 



ascifera, Ferns. petalifera, Rang. 



Cuvieri, H. and A. Adams unguifera, Rang. 



(A. dolabrifera, Cuv.). 



Genus APLYSIA, Gmelin. 



Body elongated. Gills concealed. Foot with the lobes 

 dilated and serving for swimming. Anal aperture simple, 

 sessile. 



Shell internal, sub-cartilaginous, ovate ; apex acute. 



