326 SCOTT. [Vol. XI. 



IV. The Vertebral Colimui. 



The skeleton which forms the principal subject of this paper 

 retains twenty-one of the presacral vertebrae. We may con- 

 jecture with considerable confidence that the entire number of 

 such vertebrae was twenty-six, and of the five missing ones 

 several are represented in other specimens. The neck is rela- 

 tively longer than in the tragulines or Leptomeryx, shorter than 

 in Mosc/ms, and is rather slender. As its actual length is 

 almost the same as in the musk-deer, its shortness as compared 

 with the length of the skull is very marked. In general char- 

 acters the atlas (PL XXI, Fig. 6) is like that of the Pecora. 

 It is long in proportion to its breadth, which is due to the 

 comparatively small lateral extension of the transverse pro- 

 cesses. The anterior cotyles for the occipital condyles are 

 broad, of considerable height, and widely separated both above 

 and below. Their external borders are quite deeply notched, 

 corresponding to the similar emarginations on the outer sides 

 of the occipital condyles, to which attention has already been 

 called. The ventral incision between the anterior cotyles is 

 more deeply cut than in Cervus, but the articular surfaces for 

 the accessory facets developed on the tubercles of the basi- 

 occipital in front of the condyles are not reflected so far over 

 upon the inferior arch of the atlas as in that genus. Owing to 

 the depth of this anterior incision and the position of the sur- 

 faces for the axis, the inferior arch is not so elongate fore and 

 aft as in the deer, nor is it keeled ventrally, and the hypapophysis 

 is hardly more than a rudiment. The arch is strongly convex 

 transversely and has two shallow fossae upon each of its sides. 

 The neural arch is likewise short from before backward ; for 

 though the incision between the anterior cotyles is not so deep 

 as on the ventral side, that between the posterior pair is much 

 deeper. Like the inferior arch, the neural is strongly convex 

 from side to side and the two together form a nearly circular 

 ring. The neural spine is remarkably well developed and 

 conspicuous ; it is much compressed, but quite high, and oc- 

 cupies about one half the length of the arch. On each side 

 is an elevated ridge, enclosing a lyrate area, in the middle 



