PLATE XVI. 



Eig. Page 



1. Palceomastodon headnelli, Andrews; axis vertebra, front and (1a) side 



views : one-sixth nat. size. Fluvio-marine beds (Upper Eocene). 



[C, 10061.] 144 



2. Ditto ; imperfect right humerus, front and (2 a) back views : one-sixth nat. 



size. Same horizon. [C. 10013.] 145 



3. Ditto ; right femur, front and (3 a) back views : one-sixth nat. size. Same 



horizon. [C. 10017.] 146 



4. Ditto; left tibia, front and (4a) distal views: one-sixth nat. size. Same 



horizon. [C. 10015.] 147 



c.f., coronoid fossa. 

 en., cnemial crest. 

 d., deltoid crest. 

 g.t., great trochanter. 

 7^., head. 



i., inner articular surface of upper end of tibia. 

 i.e., inner condyle. 

 i.m., internal maUeohis. 

 n.sp., neural spine. 



0., outer articular surface of upper end of tibia. 

 O.C., outer condyle. 

 od., odontoid process. 

 o.f., olecranon fossa. 

 sp.r., supinator ridge. 

 t.p., transverse process. 

 tr., trochlear surface of femur. 

 t.t., third trochanter. 



