CONCHYLl A— D/THFE^. 41. ^'^^ 



Dorset Catal. tab. 1, fig. 16. 



Dillwyn, Descript. Catal. p. 245. 



Turton, Conch. Diet. p. II, fig. 98. 



Chemnitz, x. p. 351, tab. 170, fig. 1657, 1658. 

 Area caudata. Donovan, British Shells, iii. tab. 78. 



Area Modiolus. Walker, Minute Shells, p. 23, fig. 81. 

 Sandwich, Tenby, and Scotland. It is also abundant at Melville 

 Island, and in the polar seas. 



Shell a quarter of an inch long, and rather more broad, white or 

 yellowish, with a few ridges crossing the transverse striae : and is 

 distinguished from the last by the truncated smaller end, and the 

 angle of the marginal slope being not reticulate. 



41. CARDIUM— L/A^iV£. 



Testa subcordata, cequivalvis, costis plerumque longitudinalibus ; um- 

 bonibus prominulis, contiguis. Cardo dentibus duobus approximatis, 

 obliquis, penetrantibus : later alibus utrinqu^ remotis, insertis. lAga- 

 mentum externum. 

 Shell somewhat heart-shaped, equivalve, mostly ribbed lougitu- 

 dinally ; the beaks prominent and close together. Hinge with 

 . two approximate penetrating teeth : and ou each side a remote 

 lateral inserted tooth. Ligament external. 



2a 2 



