376 JTnio distortus Bean, Cypris concentrica Bean. 



Art. XII. Description and Figures qfV^nio distdrtus Bean, and 

 Cj/pris concentrica Bean,yrom the Upper Sandstone and Shale of 

 Scarborough; and Cj/pris arcuata Bean, from the Coal Formation 

 of Newcastle. By William Bean, Esq. 



tAvio disto'rtus miki. (Jig. 53.) 



53 



Shell 2^ in. long, and 5 in. broad, transversely undulated 

 or imbricated, brown, glossy, and rounded at both ends; 

 hinge line nearly straight, with the beaks near the anterior ex- 

 tremity. From Gristhorpe Bay, in the upper sandstone and 

 shale of Phillips, where depressed and distorted casts of this 

 shell occur very plentifully at the top of the rich bed of 

 oolitic plants in the above named locality. 



Cy^prls conce'ntrica mihi. (Jig. 54.) 



Shell oval, convex, one end a little broader than the other, 

 strongly wrinkled transversely, and covered with minute con- 

 centric striae ; the hinge line is prominent ; and this species 

 has more the appearance of a bivalve shell than any of its 

 congeners. Colour pale brown. Length nearly four lines. 



