EVOLUTION OF THE SKELETON OE EOCENE AND OLIGOCENE TITANOTHEBES 



693 



Figure 630. — Manus of Oligocene titanotheres 



A, Brontops robustus, Yale Mus. 12048 (type); B, Brontops robustusf, Am. Mus. 518; C, Diplodonus tyUri, Amherst Mus. 327 (type); D, Menodus 

 trigonoccTas, Am. Mus. 515; E, Menodus trigonoceras, Am. Mus. 1079; F, Menodus giganteus, Yale Mus., after Marsh; G, BTontotherium hatcheHt 

 Am. Mus. 1047 (two middle digits restored); H, Brontothenum gigasf, Am. Mus. 1443 (two middle digits restored); I, BTontotherium gigas, Am. 

 Mus. 492 (digits I, II restored). All one-eighth natural size. In general the manus of Menodus is high and narrow and has small distal 

 phalanges; that of Brontotherium is short and wide and has wide distal phalanges. The manus of Brontops appears to be of intermediate type. 



