EXPLANATION OF PLATE XXIX. 



All the figures one-half the natural size. 



Fig. 1. Trioxyx uintaexsis : 



The nearly entire carapace or upper shield, partially represented. Specimen discovered by 

 Major Robert S. La Motte, in the buttes of Dry Creek, ten miles from Fort Bridger, and 

 presented by him to the Academy of Natural Sciences of Philadelphia. 



Figs. 2-4. Testudo Corsoni: 



Specimens discovered by Dr. Joseph K. Corson, in association with portions of the plastron, 



and the specimen of the carapace represented in Fig. 1, Plate XXX. 

 Fig. 2. Anterior view of the proximal extremity of the right humerus. 

 Fig. 3. Outer view of the same specimen. 

 Fig. 4. Distal extremity of the right femur, front view. 



Fig. 5. PAL.EOSYOPS PALUDOSTJS : 



Femur of the left side, anterior view. Specimen obtained by Dr. Carter on Grizzly Buttes. 



