EXPLANATION OF PLATE XII. 



Baptemys wyomingensis : 



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

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

 Railroad. It now helongs to the museum of the Academy of Natural Sciences of Phila- 

 delphia. 



Fig. 1. View of the carapace. 



Fig. 2. View of the sternum. 



