Fig. 1-8 . . Exogyra Cartledgei nov. sp. Del Rio clay. Reed 

 Plateau about one mile from the Chisos Min- 

 ing Company's mine, in Brewster County, 

 Texas Page 17 



Fig. 1 . . upper valve. 



Fig. 2 . . inside of the same. 



Fig. 3, 6, 7 . . surface of upper valves. 



Fig. 4, 8 . . inside of upper valves. 



Fig. 5 . . inside of lower valve showing a strongly 

 curved beak and a corresponding ligamental 

 groove. 



