684 



TITANOTHERES OF ANCIENT WYOMING, DAKOTA, AND NEBRASKA 



narrow, proximal ectocuneiform facet. Mts III, a 

 large and elongate bone, measures 200 millimeters 

 vertically and exhibits ar elatively broad (20 mm.) 

 proximal abutment against the cuboid. 



compared with those of M. heloceras are broad and 

 strong; the terminal phalanges are broader than in 

 M. Tieloceras but still retain the small dimensions 

 characteristic of this genus; the marked expansion of 



Figure 616. — Mounted skeletons of Brontops dispar? and Menodus trigonoceras 



A, B. dispar?, supposed female, Carnegie Mus. 92; Warbonuet Oreek, SioiLx County, Nebr.; lower Titanottieriitm zone, perhaps 30 feet 

 above the Pierre shale (Hatcher). Adapted from a photograph published by Hatcher. The scapula and fore limb are here placed 

 higher up on the thorax than in the skeleton as mounted. The skull, destroyed by weathering, is here restored in outline from 

 supposed females of B. dispar. B, Skeleton of M. trigonoceras in the Munich Museum; Hat Creek badlands, Sioux County, Nebr. 

 (compare fig. 615, A). In the mounted skeleton the thorax is placed too high in relation to the scapula, but this error is corrected in 

 the drawing. Both figures ore twenty-second natural size. 



As shown in Figure 613, in the relatively small D. 2 

 the proximal phalanx is more primitive — that is, 

 narrow and elongate; the distal phalanx is small; on 

 D. 3 and D. 4 the proximal and median phalanges as 



the phalanges on D. 2, D. 3 is in keeping with the 

 tendency prophesied in M. heloceras or M. proutii 

 toward the support of the greater weight of the limb- 

 on the third and fourth digits. 



