166 MYA. GAPER. Class VI. 



Found near IVeymouth. From the Port- 

 land cabinet. 



12. iNiEQUi- Lin. Tr. viii. 40. t. \.f. 6. Mont. Test. Br. 38. 



VALV1S. 



* M. with a shell somewhat triangular; strong, 

 opake white; one valve nearly double the size 

 of the other; back swelling out and bending 

 inwards; in size rather smaller than a horse- 

 bean. 



Coasts of Kent, Cornwall, and Devonshire. 



13. biden- Lin. Tr. viii. 41. Mont. Test. Br. 44. 



TATA. 



# M. with a shell somewhat oval, flattened ; at 

 the hinge one valve has two broad diverging 

 teeth; the other valve has none; color dull 

 white. Minute. 



Found by Mr. Montagu in old oyster-shells 

 in Salccmbe Bay. 



14. subor- Lin. Tr. viii. 41. Mont. Test. Br. 3Q. 



BICULARIS. 



* M. with a shell in some degree spherical ; a 

 single hinge tooth in one valve received into a 

 double tooth on the other, with lamellated side 

 teeth ; length three-eighths of an inch, breadth 

 half an inch j resembles Telllna cornea. 



