468 Annals of the Carnegie Museum. 



Lotver Teeth (Plate LXII, Figs. 2 and 3). — P-3 is rather long 

 antero-posteriorly and is not broad. It has five loops or lobes on the 

 inner side. The last two enclose a small lake. In P^ the folds are 

 larger except the first and the last three enclose two lakes. The 

 median inner fold has developed into a large antero-posterior cusp, 

 the anterior portion of which is larger than the posterior portion. 

 The lower molars increase in length from the first to the last. All 

 have small, low, basal cusps between the two external crescents. 

 These are oval in horizontal section. All the molars have the " Paice- 

 oi?ieryx4o\d'^ on the posterior faces of the anterior outer crescents. 



The Spinal Column (Plate LXI). — The neck is long — a little 

 longer than the head. The individual vertebrae are heavy and none 

 of the transverse processes are long. This gives to the cervicals pos- 

 terior to the axis a square or block-like appearance, much as the cer- 

 vicals of Antilocapra would appear were the transverse processes 

 shorter. The spine of the axis is only moderately high. It is low in 

 front, curved upward antero-posteriorly on the upper margin, and is 

 higher behind ; the upper posterior portion is overhanging. The 

 inferior median keel on the posterior portion of the centrum and the 

 descending borders of the transverse processes do not form such deep 

 concavities as they do in the axis of Antilocapra. The neural spine 

 in No. 827 is represented by low tubercles while on No. 1542 there 

 are two separate spines, low and unequal in size, situated on either 

 side of the median line of the vertebra. In this vertebra the element 

 which forms the prominent upper branch of the transverse process in 

 the succeeding cervicals is a long ridge, anterior to the middle of the 

 centrum. The base of the spine of C4 is fairly large, but its full height 

 is not shown in any of the specimens. The lower branches of the 

 transverse processes are not very high. 



The Limbs (Plate LX). — The humerus and the radius are nearly 

 equal in length. The radius is slightly sigmoid as seen from the front. 

 It is broad transversely and flattened antero-posteriorly. The radius 

 and ulna were separate. The latter was broad antero-posteriorly above, 

 and it narrows rapidly downward. It is thin transversely behind the 

 radius. 



The lower portion of the ulna is not preserved in any of the material 

 that has been worked out, but, judging by the contiguous bones, it 

 was quite large. The canon-bone of the fore foot is shorter than the 

 radius in No. 1542. In this specimen part of the distal portion of 



