EXPLANATION OF PLATE XXXI. 



Fig. 1. Restored skull of Paloeosyops. The cranium and face are introduced from the specimens of 

 Figs. 1, 2, Plate XXIV, and Fig. 51, Plate XVIII; and the lower jaw from the specimen of 

 Fig. 52 of the latter plate, and Fig. 4, Plate XXIV. About half the natural size of the 

 skull of P. paludosus. 



Fig. 2. Canjs indianensis : 



Eight, ramus of the lower jaw, one-half the natural size. Specimen from San Leandro, Cali- 

 fornia. Discovered by Dr. Lorenzo Gr. Yates, and now in the museum of Wabash College, 

 Crawfordsville, Indiana. 



Fig. 3. Felis imperialis: 



Fore part of the upper jaw, with the second premolar, one-half the natural size. Accom- 

 panying the preceding specimen. 



Fig. 4. Lutha piscinaria: 



Tibia of the right side, two-thirds the natural size. From Sinker Creek, Idaho, and belong- 

 ing to the Smithsonian Institution. 



