598 GEOLOGICAL SURVEY OF THE TERRITORIES. 



ferior margins of the succeeding segments are thickened, but the com- 

 pressed form remains, the section beiug triangular. 



The scapula is hirge for the size of the animal. It has an approxi- 

 mately triangular form, the base being superior. The posterior angle is 

 right, but the anterior regularly rounded. The apex supports the gle- 

 noid cavity on a neck which is"^ contracted by a shallow excavation of 

 the-anterior margin. The latter is bounded next the glenoid cavity by 

 the short obtuse coracoid, which stands a short jjistance above the artic- 

 ulation. The spine is long, rather elevated, with a regular convex border 

 curved backward. 



Measurements. 



M. 



Lciiy t li of three sternal segments 0. 147 



Lougth of first sternal segments 084 



Depth of first sternal segments in front * 044 



Width of first sternal segments below 004 



Width of third sternal segments 015 



Lengtk of scapnla, (median) .. ^15 



Widt h above, (greatest) 1-W 



Width of ueek 036 



Width of glenoid cavity 035 



Humerus. — The head is directed a little inside of directly backward. 

 The bicipital groove is very deep and the inner tuberosity large and 

 directed forward. The external tuberosity is much larger, as usual in 

 this group of ungulates, and rises in a hook-like apex above the level of 

 the head. The c'xternal bicipital ridge is lateral, and not very promi- 

 nent, extending on one-third the length of the shaft. The shaft is mod- 

 erately compressed at the middle, but transversely flattened below. It 

 is nearly straight. The condyles are narrow, and the inner and outer 

 tuberosities almost wanting ; their position marked by shallow concavi- 

 ties. The external continues in a lateral crest which turns iuto the 

 shaft below the lower third. The inner condyle is both the widest and 

 most prominent ; the external has its carina at its middle, and its ex- 

 ternal trochlear face oblique and narrow ; narrowest behind. The ole- 

 cranar and coronoid fossie are deej) and produce a small supra-condylar 

 foramen. 



The ulna exhibits a large and obtuse olecranon, concave on the ex- 

 ternal face. Its glenoid cavity is narrowed and elevated behind ; in 

 front it widens, and there the ulna receives the transverse proximal end 

 of the radius, which overhangs it on both sides, leaving the little eleva- 

 tions of the right and left coronoid processes about erpial. The vertical 

 diameters of the shaft of the ulna are about Cijual throughout. Its 

 section is triangular, the base being next the radius for the proximal 

 third. This is followed by an edge next the ulna, and the base of the 

 section is on the outer inferior aspect, on account of the direction of an 

 angle from a short distance beyond the outer coronoid process to the 

 base of the ulnar epiphysis, where it disappears. Distally there are 

 two other very obtuse ridges above this one. The extremity bears two 

 facets — the larger for the cuneiform, the smaller for the pisiform bone. 



The radius is throughout its length a stouter bone than tlie ulna and 

 bears much the greater part of the carpal articulation, viz : with the 

 scai)hoid, lunar, and ])art of the cuneiform bones. This articulation is 

 transverse to that of the ulna, which is thus at one side of and behind 

 it. The head is a transverse oval in section, the narrower end outward. 

 The articular face consists of one and a half troehlCcT, the latter wider 

 and internal. The shaft is a transverse oval in section, with an angular 



