Douglass : Dromomeryx. 473 



terior outer crescents. On M^ the pillars between the outer crescents 

 are small. In all the molars the antero-external crescents are con- 

 nected with the postero-internal crescents on the triturating surfaces 

 of the teeth. The first molar is much worn and the last molar slightly 

 abraded. 



The associated teeth (No. 706, Carn. Mus. Cat. Vert. Foss.) are 

 very well shown in the figure. All of the teeth show a good deal of 

 wear. The median inner pillars are fairly large. The enamel is 

 more coarsely wrinkled than in the other specimens in the Carnegie 

 Museum. The external surfaces of the postero-external crescent of M-^ 

 is concave (not much ribbed) and the antero-internal crescent has not 

 a long posterior horn. It is doubtful whether this is a species of Dto- 

 momeryx. 



Dromomeryx madisonius Douglass. 

 (Plate LXII, Figures 5 and 6.) 



Pal(Eomeryx 7nctdisonius Douglass. "The Miocene Lake Beds of 

 Western Montana," University of Montana, 1899, p. 23. 



The type of this species is a portion of a mandible with the three 

 molars incomplete (No. 755, Carn. Mus. Cat. Vert. Foss.). Though 

 this specimen undoubtedly represents a species distinct from Dro/no- 

 mcryx ajuericaniis, yet it is perhaps unfortunate that so small a frag- 

 ment should be made the type of a species. The teeth in this species 

 are proportionately higher than those of the other species from Mon- 

 tana, in fact there is a pronounced tendency in the teeth to become 

 hypsodont, and the ^'' Palceomeryx-ioXA'''' is unusually high and sharp. 

 The median outer pillars are not large. The last tooth is worn nearly 

 as much as in Dromometyx americanus, but in all the molars the inner 

 crescents are unconnected by wear with the outer crescents, except in 

 the anterior portion of My. The enamel on the outer surfaces of the 

 teeth is very much wrinkled, being completely covered with narrow 

 ridges and valleys of about the same diameter. 



A third upper premolar (No. 2146, Carn. Mus. Cat. Vert. Foss.) 

 is provisionally referred to this species on account of its size. 



Affinities of Dromomeryx, 



In his original description of "Biastomeryx borea/is'' Cope said : 

 "While Dicroceriis \Merycodus\ was probably the ancestor o{ Antilo- 



