190 CONCnyUX—DJTHYRA. 41. 



Cardium medium. Linn. Syst. Nat. p. 1122. 



Gtnelin, Syst. p. 3246. 



Turton, Linn. Syst. iv. p. 200. 



Pennant, Brit. Zool. iv. p. 186. 



Donovan, i. tab. 32, fig. I. 



Montagu, Test. Brit. p. 83. 



Linn. Trans, riii. p. 61. 



Ttirton, British Fauna, p. 153. 



Wood, Conch, p. 211, tab. 50, fig. 3. 



Dillwyn, Descript. Catal. p. 113. 



Turton, Conch. Diet. p. 32. 

 Pectuuculus subrufus. Lister, Conch, tab. 316, fig. 153. 

 Mus. nost. A very small specimen taken alive at Livermead^ 

 near Torquay. 



Shell yellowish-white with reddish-brown blotches ; ribs about 

 fifty, rather obscure in the middle but stronger at the sides, espe- 

 cially the shorter one, where they are crossed by fine striae which 

 pass over but do not cut the ribs : one of the primary teeth minute 

 or obliterated in each valve. 



laevigatum. Cardium teslo, obovtttd iiiditd, costis ohsoletis, latere antico 

 glaberrimo. 

 Shell oboval glossy, with the ribs very obscure, and quite obli- 

 terated at the anteriar side. 

 <- Cardium laevigatum. Linn. Syst. Nat. p. 1123. 

 Gmelin, Syst. p. 3251. 

 Turton, Linn. Syst. iv. p. 201. 

 Pennant, iv. p. 188, tab. 54, fig. 1. 



