151 



Patella viridula Patella pellucida 



pectinata tricostata 



Galathea australis 



Patella cymbularia. 



PLEUROBRANC HUS. 



Ann. du Mus. 5, p. 269, pi- lB t fig. 1, 2. 



An internal dorsal shell, thin, flat, and obliquely oval. 



Several species of this genus are mentioned by Cuvier, 



with which Lamarck is unacquainted. 



Pleurobranchus Peronii. 



UMBRELLA. 



PATELLA UMBELLATA. Gmeltn 



Chem. t. 10, 169,/. 1645, 1646. 

 Gmelin and others have classed this with the G. Pa- 

 tella, to which it bears the nearest resemblance. Sub- 

 sequent discoveries have enabled naturalists to pro- 

 nounce that this shell is external, though occasionally 

 covered by the animal attached to it, the body of which 

 it partially defends, Shell external, irregularly orbi- 



