CONCHOLOGY. 51 



T. decorate.* T. alta * 



T. lateralis.* T. nasuta.* 



T. alternata.* T. lineata.* 



T. vimaculata.* T. sordida.* 

 T. pumicea.* 



5. Genus Tellinides. PI. VII. 



Animal. As above. 



This genus is very nearly allied to the Psammobia, Tellina, 

 and Lucina, but upon close examination it will be found to l>e 

 distinct from either. 



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. Two species. • One species is found on the 

 shores of America. 



Tellinides Timorensis. 



T. rosea.* 



Genus Corbis. PI. VII. 



Animal. Differing slightly from the Lucina. 



This genus was classed by Lamarck with the Lucina, but the 

 great difference in the organization of the animals discovered by 

 Cuvier, has made this a distinct genus. 



Shell. Equivalve, transverse, without any irregular fold on 

 the anterior margin, having the beaks flexed inward 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. 



Corbis fimbriata. Corbis raaculata. 



7. Genus Lucina. PI. A^'II. 



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 ; 



