44 DESCRIPTION OP THE SKELETON. 



The ungueal bone of the fourth finger, different from that just described, 

 is composed of one piece only ; the processes being consolidated with the 

 body. Its length is nearly three inches ; it is flattened on its anterior and 

 posterior faces. The anterior is rather convex ; the posterior smooth and 

 concave, except at its middle, where it has a«tubercle adapted to the cavity 

 of the articulating surface of the second phalanx. 



From this description of the ungueal phalanges in the fore-feet of our 

 elephant, we will pass to that in the middle toe of the hind-foot. This has 

 nearly the same form as that of the anterior extremities, presenting a body 

 and two processes or wings. The body is of an oval form, rough and 

 prominent on its anterior face, smooth and excavated on the posterior. The 

 processes are partially consolidated with the body ; the point of union being, 

 however, perfectly distinct. They resemble those of the fore-foot. The 

 whole bone is three inches and a quarter in length ; its width, at the middle 

 of its body, an inch and a half. 



The ungueal phalanx of the fourth toe, like the corresponding phalanx 

 of the fore-foot, consists of a single piece. It is two inches and a quarter 

 long, an inch wide at its middle part; the lateral extremities are of a 

 styloid form. Its anterior surface is prominent and rough ; the posterior 

 concave and smooth, to conform to the articular surface of the second 

 phalanx. 



The ungueal phalanx of the Mastodon foot, the only one we have, 

 belongs to the middle toe of the right hind-foot. It is shorter and thicker 

 than those of the elephant just described, being an inch and three-quarters 

 in length, half an inch in thickness, rough on its anterior face, smooth and 

 a little excavated on its posterior, conforming to the articular surface of 

 the second phalanx. 



