48 CONCHOLOGY. 



T. solidula. T. capsoides. 



T. polygona. T. serradiata. 



T, ostracea. T. vimaculata. 



5. Genus TelUnides, 

 minimal. As above. 



Shell. Equilateral, transverse, somewhat elongated, nearly 

 without the flexuous plait ; two divergent cardinal teeth of which 

 the anterior is but little distant from the summit. Inhabits the 

 Bay of Naples. One species. 



Tellinides Timorensis. 



6. Genus Cordis. 

 .Animal. Differing slightly from the Lucina. 



Shell. Equivalve, transverse, without any irregular fold on the 

 anterior margin, having the beaks flexed inw^ard and opposite ; 

 two cardinal teeth ; two lateral, the posterior of which is nearest 

 the hinge; muscular impressions simple, ligament external. In- 

 habits the Indian Ocean. Two species. 



Corbis fimbriata. Corbis maculata. 



7. Genus Lucina. 

 Animal. Very imperfectly known. 



Shell. Inequilateral, suborbicular, beaks small, pointed, and 

 oblique ; two divergent cardinal teeth, one of which is bifid, and 

 which vary or disappear with age ; two lateral teeth sometimes 

 obsolete, the posterior approaches nearest to the cardinal teeth ; 

 two muscular impressions far apart, the posterior in shape of a 

 band, sometimes very long ; ligament external. Inhabits the 

 British seas. Twenty-two species. 



Lucina jamaicensis. Lucina divaricata. 



L. edentula. L. scabra. 



L. radula. L. sinuata. 



L. lactea. . L, lutea. 



L. undata. L. globularis. 



L. circinaria. L. digitalis. 



L. columbella. L. Pecten. 



