CONCHIFERA OR BIVALVES. 83 



The genus Tellinides of Lamarck is now 

 united with Tellina. 



39. Corbis. — Shell transverse, equivalve, 

 nearly equilateral, bosses 

 curved inwardly, cardi- 

 nal teeth two, lateral two, 

 one of which is remote. 

 Animal unknown. — 1 

 species recent, and 2 

 fossil. 



The shell of this genus 

 is thick and solid : there is but one species in 

 a recent state, and that is rare, from India. 



This shell may be easily distinguished by 

 the longitudinal and transverse undulations or 

 ridges crossing the external surface of the 

 valves. It is always of a white colour, and 

 tinged with pink occasionally. 



40. Lucina. — Shell nearly round, inequi- 

 lateral, bosses small and pointed, the outer 

 surface sculptured, cardinal and lateral teeth 



I distinct, but variable in number. Animal, foot 

 long and cylindrical. — 19 species recent, and 



! 15 fossil. 



From Europe, America, New Holland, &c. 

 G 2 



