CONCHYLIA— DlTilll?^. 36. 141 



Ttirton, Linn. Syst. iv. p. 219. 



Chemnitx, vi. p. 303, tab. 29, fig. 229, 300. 



Donovan, British Shells, ii. tab. 44. 



Montagu, Te^i. Brit. p. 112. 



Pennant, iv. p, 201, tab. 57, fig. 1. 



Turton, British Fauna, p. 157. 



liinn. Trans, viii. p. 78. 



Dorset Catal. p. 34, tab. 8, fig. I . 



Dillwyn, Descript. Catal. p. 163. 



Turton, Conch. Diet. p. 231. 

 Pectunculus strigatus. Da Costa, p. 185, tab. 12, fig. 1. 

 Pectunculus crassissimus. Lister, Conch, tab. 284, fig. 122. 

 Mus. nost. English and Irish coasts. 



Shell two inches and a half in diameter, of a brownish-white 

 color, strong and heavy, almost globular like a ball, with trans- 

 verse undulate plates which break into wart-like protuberances 

 at the sides, especially the anterior part : there are also some 

 longitudinal lines which are chiefly distinguishable about the 

 hinge. 



Vends testd orbiculo-fordatd convexd, laminis transversis Casina. 



subimbricalis Itevihus, areold cordatd. 

 Shell orbicular heart-shaped convex, with transverse somewhat 

 imhrieated smooth plates, and the areola heart-shaped. 

 Tab. nost. 9, fig. 1^ 

 Venus Casina. X.mn. Syst. Nat. p. 1130. 

 Gmelin, Syst. p. 3269. 

 Ttirton, Lino. Syst. iv. p. 220. 



