214 CHAMA. Class VI. 



GENUS XII. CHAMA. 



Animal, a Tethys. 



Shell strong. 



Hinge rugged, gibbous. 



Teeth obliquely inserted into opposite valves. 



1. cor, Gm. Lin. 3299. Mont. Test. Br. 134. 



Lin. Tr. viii. 90. 



* C. with a smooth and somewhat globose 

 shell; beaks recurved and convoluted like a 

 ram's horn. 

 Scotland. 



