344 SCOTT. [Vol. V. 



the outer side of the jaw. They are less procumbent than the 

 median, and project slightly upward. They are much like the 

 corresponding teeth in Coassus. The third is somewhat shorter 

 and broader than the second. The crown of the canine is not 

 preserved in any of the specimens, but its fang shows that it 

 had taken on the functions of an incisor, and that it was slightly 

 larger than the external member of that series. 



The first premolar is a very small tooth, which is separated by 

 a considerable diastema from the canine, and by a shorter one 

 from the second premolar. The crown is a perfectly simple, 

 erect, and compressed cone, and were it not for its position in 

 the jaw, might easily be taken for a small canine. This tooth is 

 inserted by a single fang. 



The succeeding premolars increase successively in size and 

 complexity from the second to the fourth. When looked at from 

 the external side, they are all very much alike except in size, 

 and are composed of a high, compressed, and very acute cone, 

 with sharp-pointed anterior and posterior basal cusps, except 

 that in pm. 2 the anterior cusp is wanting. On the inner side, 

 however, there are more important differences. In pm. 4, there 

 is a thin crest which runs back from the median apex of the 

 tooth parallel to its external wall and enclosing a deep valley 

 with the latter; an indication of this same structure, but not 

 nearly so marked, is visible on pm. 3. Compared with the pre- 

 molars of Tragulus, those of Leptomeryx, both upper and lower, 

 are in most specimens very much more complicated. 



The inferior molars are at first sight much like those of 

 Tragulus, but there are some important differences. Schlosser 

 has pointed out a peculiarity which occurs in all tragulines : 

 "Die unteren Molaren sind ausserordentlich charakteristisch. 

 Sie haben in der vorderen Halfte auf jedem Monde eine starke, 

 von der Spitze nach hinten zu herablaufende kammformige 

 Leiste" (No. 47, p. J^). These characteristic crests are usually, 

 but not invariably, present in Leptomeryx, and often occur on 

 the posterior crescents as well. In this genus also the valleys 

 are wider and deeper than in Tragulus, and the talon of the 

 last molar decidedly larger ; it consists of two distinct cusps, 

 of which the external one is the larger, and is separated 

 from its fellow by a deep cleft. There are no basal pillars 

 on the lower molars. All of the inferior molars and premolars 



