GASTEROPODA. 



fil 



ribbed ; aperture linear, lip thickened, slightly sinuated at 

 the upper part; canal very short. Animal, with 

 slender variously formed tentacula, converging at Mk 

 their inner bases, and bearing the eyes at various mm 

 heights on external bulgings ; siphon produced 

 beyond the canal of the shell ; two branchial MangeKa 

 plumes ; proboscis retractile ; tongue with a simple 

 rachis, and a single series of subulate denticles arming 

 each lateral membrane; foot ample, truncate in front, 

 variously shaped behind ; operculum usually wanting, 

 when present unguiculated with a terminal nucleus.* 

 — 71 species, f 



Mr. Hinds, in the Zoology of the voyage of the " Sul- 

 phur," says that the animal of these shells is found in 

 various situations, on reefs, under stones, &c. They are 

 brought from various parts of the world, and several 

 species are natives of our coasts. 



Bela. Gray (Defrancia Moller). — Shell 

 spindle-shaped, ribbed longitudinally, keeled be- 

 neath the sutures; aperture rather long, some- 

 what narrowed below, no sinus above. 



The type is Murex turricula. Philippi remarks 

 that Loven placed these shells with Tritonium, 

 so little resemblance do they bear to Pleuro- 



7 Bela tttr- 



toma. ricula - 



BORSONIA. Bellardi. — Shell fusiform, lip simple, the 

 sinus deep, and separated from the suture ; the columella 

 lip provided with a fold. — 1 species, fossil. 



Conofleura. Hinds. — Shell coniform or involute, 

 with the spire conically elevated ; with a deep posterior 



* Forbes' British Moll. 



f Reeve's Iconica. 



