^52 



It has been confounded by some writers with L. JVor- 

 wegica, but is very distinct, if the figures hitherto 

 given of that species are correct. 



LEPTON. 



GENERIC CHARACTER. 



Shell suboval or suborbicular, equivalve, inequi- 

 lateral ; hinge with two linear teeth in each valve, 

 divaricating from the beaks ; one of the teeth angu- 

 lated ; muscular impressions two, suboval, lateral ; 

 ligament internal. 



OBSERVATIONS. 



This genus of small bivalves was constructed by 

 Dr. Turton, and illustrated in his " Conchilia Insula- 

 rum Bflttanicarum." Capt. Brown has since given 

 it the name of Tellimya, and figures several new spe- 

 cies of the British coast. One has been found on the 

 coast of the United States, and another species oc- 

 curs fossil in the Pliocene of Maryland. 



