182 CONCHYLIA— I>/T/fyi?^. 41. 



Shell somewhat globular and ponderous, a little truncate on the 

 anterior side, with 21 ribs, the anterior ones tubercular and the 

 hinder ones somewhat scaly, and together with the interstices 

 rough with wrinkled striae. 

 Cardium tuberculatum. Liinn. Syst. Nat. p. 1122. 

 Gmelin, Syst. p. 3248. 

 Turton, Linn. Syst. iv. p. 202. 

 Pennant, Brit. Zool. iv. p. 188. 

 Donovan, British Shells, iii. tab. 107, fig. 2, 

 Montagu, Test. Brit. p. 508. 

 Linn. Trans, viii. p. 64. 

 Turton, British Fauna, p. 152. 

 Wood, Conch, p. 210, tab. 50, fig. 1, 2. 

 Dorset, Catal. p. 31, tab. 2, fig. 2. 

 Dillwyn, Descript. Catal. p. 117. 

 T«r/o», Conch. Diet. p. 28, fig. J 2. 

 Chemnitz, vi. p. 179, tab. 17, fig. 173. 

 Pectunculus major. Lister, Conch, tab. 329, fig. 166. 

 Mus. nost. On the western coasts. 



Shell growing to the size of the last, from which it differs in 

 the following particulars, and by which they may be easily dis- 

 tinguished. 



It is more solid and ponderous, of a more globular shape, and 

 running in a nearly straight line on the cartilage side from the 

 beaks : the ribs are narrower, and the grooves are deeper, both 

 marked with strong irregular transverse striae : the cartilage side 

 is clothed with rather sharp tubercles which never extend into 



