| M. | |
| Ulna, length, excluding olecranon | ·224 |
| Ulna, length of olecranon | ·080 |
| Ulna, transverse diameter, proximal surfaces | ·041 |
| Ulna, diameter of shaft at median line | ·038 |
| Ulna, fore-and-aft diameter, distal face | ·025 |
| Ulna, transverse diameter, distal face | ·017 |
| Radius, proximal face, transverse | ·048 |
| Radius, proximal lace, fore-and-aft | ·030 |
| Radius, median diameter, shaft | ·019 |
| Radius, median diameter distal face, transverse | ·043 |
| Radius, median diameter distal face, fore-and-aft | ·016 |
The manus is described from the third and fourth metatarsals, with three phalanges. The metatarsals are short, with a wide, stout shaft, flat in front and slightly arched forwards behind. The proximal ends unite and form a continuous articular face, concave from side to side; while upon the exposed sides are smooth facets, indicating the presence of two additional toes of less size. (See [Plate III].) The convex distal faces are marked behind by a slight groove.
The phalanges are very short and broad, the lower facets marked by a shallow median groove. The ungual phalanx is wide and short, with a crescentic outline.
Measurements.
| M. | |
| Third metatarsal, total length | ·090 |
| Third metatarsal, transverse diameter, proximal face | ·017 |
| Third metatarsal, transverse diameter, distal end | ·019 |
| Second phalanx, length | ·024 |
| Third phalanx | ·014 |
| Total estimated length of manus (6 inches) | ·155 |
Palæosyops vallidens, Cope.
Proceedings Am. Phil. Society, 1872, p. 487; Hayden's Survey, 1872, p. 572.
Specific characters.—Founded on details of dental structure. Superior size. In the upper molars two strong transverse ridges connect the inner tubercle with the outer crescents, inclosing a pit between them. In the premolars the outer crescents fuse almost into a single ridge. These united crescents are relatively narrower. The inner molars are also narrower, and the posterior tubercle of the last is an elevated cone.
Fragment of a lower jaw containing the two posterior molars. The measurements of the teeth are identical with those given by Professor Cope. The depth of the ramus below the last molar is three and one third inches, and it is slightly heavier below than in P. major.
Restoration of Palæosyops.—The elevation of Palæosyops major, which is taken as a type, was approximately the same as that of Palæotherium magnum as restored by Cuvier.