236 BU1,I,BTIN 31 336 



PLATE 35 



Figure Page 



1-5. Crassatellites protextus Qonrad, Claiborne loi 



Fig. I, 45 mm., showing umbonal markings, lunule, &c. 



2, 48 " right valve ; 2, a, left. 



3, 40 " broad form. 



4, 18 " young, showing concentric ribbing and sinu- 

 osity. 



5,40 mm., typical. 



6. Crassatellites alius Conrad, Claiborne sand 104 



Right valve 82 ; left, 97 mm. 



