plate: XXXII. 



FIG. I. 

 CARDIUM MEDIUM. 



pigeon's heart cockle, 



GEKERIC CHARACTER. 



Two teeth near the beak ; and another remote one on each fide of 



the shell. 



SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Shell somewhat heart-shaped, and furrowed longitudinally, retusc 



on one fide. 



CTardium Medium : testa subcordata, antice retusa longitudinal!-. 

 ter striato sulcata. Linn. Sj/st. Nat. n. 77. 

 J?. 1122. List. Conch, t. 316. Jig. 152. Gualt. 

 t. 83. /. b, Chemn, Conch, t. 16- fig. 162.— 

 165. 



This shell has not hitherto been noticed as of Englifli growth. 

 Our specimen, which differs in no respedl from those found in the 

 Meditenanean sea, was found near Hartlepoole, on the co^st of 

 Durham. 



K 3 



