324 MARINE SHELLS 



Species. 



C. *elongata. Shell elongated before and behind 

 into compressed processes; posterior valves of the 

 operculum, more prominent and truncated at tip. 



Inhabits the southern coasts on Gorgonia virgu- 

 lata. Lam. 



Cabinet of the Academy and Philadelphia Mu- 

 seum. 



Anterior and posterior processes very much com- 

 pressed, acutely edged above and beneath, and usual- 

 ly as long as the body of the shell ; shell generally 

 covered with a dirty brown epidermis, beneath which 

 it is white, with rufous clouds and lines; posterior 

 valves of the operculum larger, more prominent, 

 truncated or widely emarginate at tip. 



Balanus galeatus an inhabitant of the Asiatic 

 ocean, a species long known, a* d described by va- 

 rious authors, is congeneric with the species here 

 described. The peculiar characters of these shells, 

 their general appearance and their habitat, will not 

 admit of their being referred to the genus Balanus in 

 a perfectly natural arrangement. I have therefore 

 thought it necessary to frame the present genus for 

 their reception. 



The anterior pro > the elongata is generally 

 acuminated and lo> - than the posterior one, which 

 is more compressed, and is generally more or less 

 elevated from the branch of the Gorgonia ; upon 



