EXPLANATION OF PLATE XXIX. 



All the figures one-balf the natural size. 



Fig. 1. TkIOXYX UlNTitENSIS : 



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

 Major Kobert 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 Uoksoni: 



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. Paljeosyops paludosus: 



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



