EXPLANATIONS OF PLATES 

 PLATE I 



Fig. 1, 2. . .Exogyra weatherfordensis Cragin. Glenrose 

 formation. One-fourth of a mile west of 

 Weatherford, Parker County, Texas. Page 5 



Fig. 3, 4. . .Exogyra plexa Cragin. From bed with Exo- 

 gyra texana 'below the Kiamitia clays. 

 Texas and Pacific Railway, three miles west 

 , of Benbrook, Tarrant County, Texas. Page 8 



Fig. 5 Exogyra nov. sp. aff. plexa Crag. From bed 



with Exogyra texana below the Kiamitia 

 clays. Texas and Pacific Railway, three 

 miles west of Benbrook, Tarrant County 

 Page 8 



Fig. 6 Exogyra sp. aff. plexa Crag. '-Kiamitia chy. 



Little Mineral Creek, north of Pottsboro, 

 Grayson County, Texas. 



Fig. 7-13 . . . Exogyra Cartledgei nov. sp. Del Rio clay. 

 Reed Plateau, about one mile from the 

 Chisos Mining Company's mine in Brc-wster 

 County, Texas Page 17 



Fig. 7-9, 11-13, beaks of the lower shell showing the dif- 

 ferent stages of development. Fig. 10, Lig- 

 amental groove of a large and slender speci- 

 men. 



