98 MASTODON AND ELEPHANT. 



Lower and lighter. The lower jaw is shorter, and differs remarkably in its anterior 



Jaw. 



termination, which has some similarity to the shape of a ploughshare. 



Extremities. — The scapula corresponds, at its superior angle, with 

 the bases of the spinous processes more nearly than in 'the other skeletons; 

 but this position depends on the mode of articulation. The head of the 

 os humeri is much less massive. The anterior process is sharper, the pos- 

 terior much blunter and shorter. The bone itself is also less massive. 

 The radius and ulna are more crossed. The foot is more vertical and 

 narrower. 



Posterior Extremities. — The os femoris is long and slim. The tibia 

 is more in front of the fibula. The patella is less prominent. The hind 

 foot is narrower, more elevated, and less spread, than in the Mastodon. 



On reviewing the skeletons, that of the Elephant appears, as before 

 intimated, decidedly lighter and better calculated for motion than that of 

 the Mastodon ; while the latter presents, especially in its anterior parts, 

 an arrangement adapted to sustain a very great weight, and move a very 

 heavy mass. 



