44 



sustentaculum is of much greater extent vertically, and sustains a long ellipti- 

 cal facet for the astragalus. The anterior articular facet for the latter is of 

 much less extent than in the tapir, and is more distinctly separated from it 



by the interosseous sinus. The articulation for the cuboid is of greater depth 

 but less width than in the tapir. 



The extreme length of the calcaneum is 4^ inches. The length of the 

 tuberosity is nearly 3 inches. The breadth of the anterior extremity of the 

 bone is 2^ inches. 



Of two additional calcanea obtained by Dr. Carter, one was found on 

 Henry's Fork of Green River ; the other near Millersville. 



Fig. 3, Plate XX, represents an astragalus found by Dr. Carter at the 

 bluffs, three miles from Millersville. The trochlea for the tibia is of less ex- 

 tent fore and aft than in the tapir; and the anterior extremity of the bone is 

 of less width but greater depth. The length of the astragalus is 2 inches ; 

 the breadth of the trochlea twenty lines ; the breadth of the anterior ex- 

 tremity is the same, and its thickness is an inch. 



Another astragalus, slightly larger, was obtained by Professor Hayden's 

 party at Church Buttes. 



Fig. 4, Plate XX, represents three tarsal bones obtained by Professor Ha}'- 

 den's party at Church Buttes. They pertained to the same individual, and 

 consist of the cuboid, scaphoid, and the outer cuneiform. 



The cuboid is more cubical and stouter than in the tapir. The upper 

 surface is more regularly square and nearly a third wider than in that animal. 

 The articular facet for the calcaneum has about the same depth, but is nearly 

 twice the width. The facet for the first metatarsal bone is also of equal 

 depth, but a third greater in width. 



The scaphoid is of rather less breadth than in the tapir, nearly of equal 

 depth, but not quite so thick. The articular facet for the astragalus is of 

 about the same extent, less breadth, but proportionately more uniform depth, 

 and it is less concave. The articular facet for the outer cuneiform is of about 

 the same depth, but of much less breadth than in the tapir. The facets for 

 the inner two cuneiforms have about the same extent as in the latter. 



The external cuneiform is about the same depth as in the tapir, but of con- 

 siderable less breadth and of greater thickness. 



The metatarsal articular facets of the cuboid and external cuneiform ap- 

 pear to indicate that the outer toe of Paleeosyops was as large as the middle 



