42 



only roughened al the summit for the attachment of the nuchal ligament. 



The lateral processes are angular and divergent, and the space between them 

 is 4.V inches in width. The lower portion of the occipital surface approaching 

 the occipital foramen is convex. The height of the occiput from the latter is 

 about 4% inches. 



A lumbar vertebra was found by Dr. Corson at Grizzly Buttes. It pre- 

 sents the ordinary ungulate form. The body is 2 inches long, but some- 

 what shortened below. It is concave fore and aft, at the sides, and beneath, 

 where it is also slightly carinate. The anterior extremity is slightly convex, 

 li inches transversely, and a little less in depth to the prominence beneath. 

 The posterior surface is flat, or feebly depressed. The transverse process 

 springs from the upper level of the body. A well-developed metapophysis 

 projects from the position of the anterior zygapophysis. The diameter of the 

 spinal canal is about an inch. 



Besides the skull-fragments and vertebra of Paleeosyops, a number of 

 isolated carpal and tarsal bones, and many fragments of the long bones and 

 other portions of the skeleton have been collected by Dr. Carter, Dr. Corson, 

 and Professor Hayden's party. Many of the bones had been fractured, or 

 more or less crushed, while they lay in their bed, and many have been further 

 injured after exposure through the influence of the weather and other causes. 

 The bones nearly resemble in size and construction the corresponding ones 

 of the American tapir. 



The distal extremity of a humerus, represented in Fig. 3, Plate XIX, was 

 found by Dr. Corson in the vicinity of Fort Bridger. The breadth of the 

 specimen between the supra-condyloid eminences is 3<j inches. A deep 

 supra-condyloid fossa occupies the front of the humerus, opposed to the 

 deeper and more capacious olecranon fossa. The articular trochlea is 2£ 

 inches wide in front, and narrows an inch less behind. 



A mutilated femur, without the head and trochanters, represented in Fig. 1, 

 Plate XIX, was obtained on Henry's Fork, of Green River, by Dr. Carter. 

 In its complete condition it has approximated 15 inches in length. The 

 shaft is three-sided, and at the middle is 16 lines in diameter from before 

 backward, and 19 lines transversely. The median trochanter projects from 

 the outer border of the prismoid shaft, and is higher up in position than in 

 the tapir. The distal extremity resembles the corresponding part in the 

 latter, but the trochlea for the patella is of less breadth. 



