213 



DELPHJNULA. 



TURBO DELPHINUS. LlHHCeUS 



Mawes Linn. pi. 28, /. 4. 

 This genus possessing the round mouth of the G. Tur- 

 bo, probably induced Linnaeus to consider it of that 

 family, but the united margin of the aperture at once 

 distinguishes it from the Turbo. In many respects 

 it approximates the G. Scalaria, like which it some- 

 times has the whorls drawn out and detached. The 

 shell is solid, conical, or subdiscoid, umbilicated, thick, 

 nacreous within and under the external coating; aper- 

 ture entire, round, or trigonal; whorls of the spire rug- 

 ged on the outside, and angular on the side of the umbi- 

 licus, (which is filled with short spines proceeding from 

 the interior side of the whorls, not mentioned by La- 

 marck); no columella is visible: it is presumed the ani- 

 mal has an operculum; the exterior is armed w ith spines, 

 depressed and pal mated at the summits, tubercles, or 

 scabrous stria?. The solidity and pearly substance of 

 these shells and their external surface, at once distin- 

 guish them from the terrestrial G. Cyclostoma, though 

 both possess a circular united aperture. 



Delphinula laciniata Delphiuula distorta 



Delphinula turbiuopsis. 



[There arc also seven fossil species.] 



