HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. 337 
MEASUREMENTS OF Utna-RapIus. 
No. 1604 No. 1700 No. 1782 
(elatus), (petersont), (peterson), 
mm. mm. mm. 
Greatestilenothxoiulmamrscm irae Beret ere rete ears cert pot cae ts 709 575 540 
hengstheoifolecranonsprocesss remicci are tie ei ely eels Chl iste ton 177 116 116 
Transverse diameter of ulna at the upper margin of the sigmoid notch..... 45 38 35 
Transverse diameter of ulna at middle of sigmoid notch................. 45 37 35 
Transverse diameter of ulna at coronoid process..................2.-00- 145 95 83 
Antero-posterior diameter of ulna at upper margin of sigmoid notch...... 118 90 90 
Antero-posterior diameter of ulna at middle of sigmoid notch............ 72 57 55 
Antero-posterior diameter of ulna at coronoid process................-.- 70 65 60 
Antero-posterior diameter of ulna at distal articular surface.............. 45 sas 27 
Transverse diameter of ulna at distal end........................0.000. 40 Rae 27 
Greatestsenptheotmadiusmm wetanie cnet. eau tia Ree mee nly See at 580 460 452 
Antero-posterior diameter of head of radius.........................--- 56 45 42 
iiransverse;diameteromheadvotradiisnar sana dela nce Gee ce 140 110 102 
Transverse diameter of head of radius and ulna united.................. 148 110 105 
Transverse diameter of distal articulating surface of radius and ulna united 184 102 91 
THe Fore Foor. 
(Plates LX VITI-LXIX.) 
The carpus is diplarthrous, low, and broad. The metacarpals are long, 
cylindrical, very robust, and have curiously shaped distal ends, especially adapted 
for the reception of the anomalous phalanges, and the sesamoids on the plantar 
surface. The phalanges are rather short and heavy. The terminal phalanges are 
cleft at their extremities, and in life were covered by high and narrow hoofs. 
The Carpal Elements. 
The bones of the carpus are represented in our collection by scores of speci- 
mens coming from a multitude of individuals. In the following descriptions we 
have mainly utilized the material represented in the articulated skeleton, though 
frequently employing other specimens for purposes of comparison. 
The Scaphoid (Fig. 79).—The seaphoid is heavy and very broad. The general 
shape of this bone is strikingly similar to the scaphoid of the Titanotherude. The 
proximal surface, or the articulation for the radius, is even more plane, but covers 
a relatively smaller area than in the latter family, the postero-ulnar portion of the 
bone continuing as a rough and uneven surface in Moropus elatus, while in Titano- 
therium the articulation covers nearly the entire proximal face. Anteriorly, 
radially, and posteriorly, the scaphoid of No. 1604 is symmetrically rounded 
in outline. The ulnar face has two facets for the lunar, near the anterior face, 
