152 MOLLUSCA FROM THE CRAG. 



p. 468) made use of the same name, apparently without being aware of its having 

 been previously adopted by Dr. Fleming. 



Shells of this genus approach nearest in form to those of Sigaretus ; but the 

 volutions in the latter genus are more depressed, aud the animal partly envelopes 

 the shell. In this genus the shell is said to be wholly external. I am not aware 

 of any species belonging to this genus of an earlier geological date than the Coralline 

 Crag or Miocene period. 



1. Velutina ljivigata. Linn. Tab. XIX, fig. 8, a — b. 

 Helix laevigata. Linn. Syst. Nat. p. 1250, 1766. 

 Bulla velutina. Mull. Zool. Dan. iii, t. 101, fig. 1-1, 1773. 

 Helix laevigata. Penn. Brit. Zool. t. 86, fig. 139, 1776. 



— Turt. Linn. vol. i.v, p. 540, 1806. 



— Id. Conch. Diet. p. 69, 1819. 

 Velutina vulgaris. Flem. Edin. Ency. vol. xiv, p. 626, 1820. 



— cavu.lo.cdea. Blainv. Malac. p. 469, pi. 42, fig. 4, 1824. 



Ca lebiculum l&vigatcjm. Brown. Illust. Brit. Conch, pi. 38, fig. 35, 1827. 

 VelOTIna l^vigata. Flem. Brit. Animals, p. 326, 1828. 



— EUPicc-iiA. Conrad. Journ. Ac. Nat. Sc. vi, 266, pi. 5, fig. 17-18. 



— laevigata. Gould. Invert, of Massach. p. 241, fig. 159, 1841. 



— — 8. Wood. Catalogue 1842. 



V, Testa auriformi, ienui, fragili, ovatd, vijlaid, tenuissime striata ; anfractibus 

 tribus, convexis, tumidis ; sufuris profundis ; aperiurd valde dilatatd; umbilico tecto. 



Shell ovate, inflated, thin, and fragile, finely striated transversely; volutions 

 three, with a deep suture, and a large expanded aperture, subcircularj left lip 

 reflected, covering the umbib'cus. 



Axis, \ an inch nearly. 



Locality. Mam. Crag, Thorpe. Recent, British Seas. 



This sbell, I believe, is rare, perhaps from its ex ti erne fragility. My cabinet con- 

 tains but one specimen, which differs in some degree from the recent shell, the outer 

 lip being more elevated, the spire depressed, and the exterior smooth; but in the 

 recent specimens the strias are scarcely visible when the epidermis is removed. 

 Pennant calls this a fresh-water shell, aod Dr. Tmtou says "it inhabits ponds of 

 Europe." It appeal's to have been associated with estuary sheUs, though Montague 

 says it is truly marine, aud generally obtained by the dredge in deep water. Dr. 

 Gould says it is found on the beach in sea weed, aud also in the stomachs of fishes. 

 Sigaretus similis, Woodward (Geol. of Norf. t. 3, f. 8), may probably be this species ; 

 but from the figure, it is difficult to determine, as both this and the following are 

 found at Bramerton, the locality whence he obtained most of his fossils. 



