GASTEROPODA. 



75 



beyond the canal of the shell; foot extensive, expanded, 

 oblong, truncated, and angulated in front, bifurcated at 

 its posterior extremity; branchial plumes two.* — 68 spe- 

 cies ; also fossil. 



They abound in the seas of the South of Europe and 

 the East Indies ; and three species are also found on our 

 coasts. They are occasionally seen on the sands and reefs, 

 feeding on the Mactra and other bivalves ; they pierce 

 the shells with their proboscis, making an extremely 

 regular round hole, and extract the contents through the 

 aperture thus formed. They are very lively and active, 

 and are called " dog- whelk " by fishermen. 



Philippi includes Phos Montf. as a sub-genus. 



Demoulia. Gray. — Shell oval, almost globular, co- 

 vered with a woolly epidermis ; spire short, conical ; apex 

 wart-like ; whorls compressed ; mouth oval ; inner lip 

 thickened, and with a furrow at the back ; the outer lip 

 curved inwardly, thickened externally, without a varix, 

 strongly plaited inside ; canal short, much curved. Animal 

 unknown. — 2 species, also fossil. 



Cyllene. Gray. — Shell small, ovate, swollen, trun- 

 cated at the base, and slightly recurved; spire 

 short, sharp, pointed; the sutures channelled; 

 inner lip either smooth or finely grooved; a 

 slight notch near the base of the outer lip ; in- 

 terior finely Grooved in rays. Animal unknown. 



,«\ ' . C>/Tlene 



— 3 (?) species. 



Sowerby says, — " This genus of small marine shells re- 

 sembles Voluta in general character, but differs in having 

 a smooth columella, without folds." — The species come 

 from the Pacific. 



* Forbes' British Mollusca. 



