187 



From the femur of the Mastodon Audium of South America, the 

 present specimen differs in the minor development of the trochanter 

 major, which neither rises so high nor extends so far out ; the outline of 

 the external border of the upper half of the femur is accordingly less 

 concave in the Mastodon giganteus : the anterior surface of the upper 

 part of the bone is flatter and does not slope so gradually to the outer 

 margin. The upper border of the neck of the femur is more concave in 

 the Mastodon gigatiteus. The rotular surface is more regularly concave 

 from side to side, and is less distinctly defined at its lower part. 



From the tertiary formations of Ohio, North America. 



Purchased. 



780. The head of the femur, in the state of an epiphysis, of the Mastodon 

 giganteus. This shows, as in the Elephant and Mastodon, the absence 

 of the depression indicative of the ligamentum rotundum. 



From the tertiary formations of Ohio, North America. 



Purchased. 



781. The head of the femur, anchylosed to the shaft, of the Mastodon 

 giganteus. 



From the tertiary formations of Ohio, North America. 



Purchased. 



782. The condyles of the right femur, anchylosed to the shaft, of the Mastodon 

 giganteus. 



From the tertiary deposits of Ohio, North America. Purchased. 



783. The distal extremity with the articular condyles of the left femur, in the 



state of an epiphysis, of the Mastodon giganteus. From the size of this 

 specimen as compared with the entire femur, No. 778, it would seem to 

 have belonged to the skeleton of a young male. 



From the tertiary formations of Ohio, North America. 



Purchased. 



784. The right patella of the Mastodon giganteus. 



Frooi the tertiary formations of Kentucky, North America. 



Purchased. 

 2 b 2 



