CONCHOLOGY. 



PLATE CXXIV. 



CARDIUM RACKETTII 

 RACKETT'S COCKLE 



Bivalve. 



generic character. 



Shell bivalve, nearly equilateral, equivalve, generally convex, 

 longitudinally ribbed, striated, or grooved, with a toothed margin : 

 hinge with two teeth near the beak, and a larger remote lateral one 

 each side, each fitting into the opposite hinge. 



Shell somewhat cordate, or heart-shaped, thin, whitish, with 

 forty-seven obsoletely imbricated ribs. 



Cardium Rackettii : testa subcordata, tenui, albida, sulcis 47 

 obsolete recurvato imbricatis. 



In one of our late numbers a new species of the Australasian 

 Pectens was introduced to the attention of the public under the 

 denomination of Ostrea Matonii, a comphment we were induced to 



