PLATE LV. 
Bones of Coryphodon sirnus, two-ihirds natural size. Page 225. 
Figs. 1-4. Portions of tbo cranium described as typical in tbe present work. 
Fig. 1. Left maxillary bone which supported tbe true molars and last two premolars. 
Fig. 2. Pigbt premaxillary bone without tbe apices, exterior side. 
Fig. 3. Both mandibular rami supporting molars only, from above; a, right ramus, interior side. 
Fig. 4. External side of the posterior or exoccipital bounding crest of the temporal fossa ; a, posterior 
view. 
Figs. 5-10. Bones of a second individual. 
Fig. 5. Adjacent portions of maxillary and premaxillary bones of the right side, the latter containing 
three alveoli and wanting apex; a, inferior view of the same. 
Fig. 6. Portion of right mandibular ramus supporting Pm. 4 and M. 1, from above. 
Fig. 7. A dorsal vertebral centrum, anterior view ; a, inferior side of the same. 
Fig. 8. Head of humerus, extremital view. 
Fig. 9. Proximal end of radius, inferior view ; a, proximal or humeral surface of the same. 
Fig. 10. Distal extremity of femur, from above, a, from the outer side. 
