EXPLANATION OF PLATE XII. 



Baptemys wyomxngensis : 



Figures one-third the natural size. Specimen discovered at Church Buttes, Wyoming, by 

 Mr. O. C. Smith, of Leverett, Massachusetts, while engaged in service of the Union Pacific 

 Eailroad. It now belongs to the museum of the Academy of Natural Sciences of Phila- 

 delphia. 



Fig. 1. View of the carapace. 



Fig. 2. View of the sternum. 



