Class VI. MYA. GAPER. 161 



shaped, in each valve ; length one inch, breadth 

 two inches. Tab. 1. Jig: 1. 



On the western coast, from Poole to Fal- 

 mouth. 



Lin. Tr.vni. 37. Mont. Test. Br. 4:2. t. \.f. I. 5. distorta. 



* M. with a shell somewhat ovate ; valves dis- 

 torted, convex, hinge tooth strong ; shell white, 

 brittle, nearly transparent; length three quar- 

 ters of an inch, breadth one inch. 



Found by Mr. Montagu in limestone near 

 Plymouth. 



Lin. Tr. vlii. 37- 6. batava. 



* M. with a shell nearly oval, rounded at each 

 end ', length one inch, breadth one inch and 

 three quarters. 



Pound in the river Kennet, near Nezohury, 

 Berkshire. 



M- arenaria. Lin. Syst. 1112. Lin. Tr, vlii. 33. - arena- 



Got. Lin. 3218. Faun. Suec. Mont. Test. Br. 30. ria. 



No. 2127. sand. 



M. with a tooth like that of the My a decUvis ; 

 mouth large ; rough at the base ; the whole 

 shell of an ovated figure, and much narrower at 



VOL. IV. M 



