EVOLUTION or THE SKELETON OF EOCENE AND OLIGOCENE TITANOTHERES 



689 



Manus in the Yale Museum 



A manus in the Peabody Museum of Natural His- 

 tory at Yale University (No. 12012) may pertain to 

 Menodus giganteus; there is no proof of association 

 with Marsh's type of Brontotherium ingens ( = Meno- 



The manus (fig. 619) is of the high, narrow type seen 

 in Menodus. The phalanges are bent back in the 

 rock so as to lie against the back of the hand. In the 

 figure they are represented a little too small and 

 appear to taper too suddenly. 



Figure 621. — Atlas and axis of Brontotherium leidyi 

 t, Carnegie Mus. 93; atlas, top view. B, Carnegie Mus. 114; atlas and axis proTisionally referred to 

 B. leidyi. Bi, Atlas and axis, side view; Bj, atlas, top view; B3, front view. One-eighth natural size. 



BE C 



Figure 622.— Vertebrae of Broniops rohustus (A, B, C), Yale Mus. 12048 (type), 

 compared with those of Brontotherium gigas (D, E, F), Am. Mus. 492 



A, D, Third cervical vertebra; B, E, third dorsal vertebra; C, F, second (?) lumbar vertebra. The third 

 cervical vertebra of Brontops has a much longer centrum and a stouter neural arch. (The neck of 

 Brontotherium was shorter.) The third dorsal vertebra of Brontops has the spine curved anteroposteriorly 

 and the lateral process less elevated. The second (?) lumbar vertebra of Brontops has a longer centrum 

 and more recumbent neural arch. One-eighth natural size. 



dus giganteus), as the manus was received at the 

 Museum in 1874, whereas the skull was received in 

 1873, although both came from the same general 

 region and from the same collector (Devendorf).*^ 



*8 Information kindly supplied by Prof. R. S. Lull. 



SUBFAMILY BEONTOTHERIINAE 



The Brontotheriinae include lower Oligocene titano- 

 theres, extremely graviportal and brachypodal, espe- 

 cially in the pes. 



