MUSEUM OF COMPARATIVE ZOOLOGY. 85 



from them by a short interval, arises a pair of small metapophyses. The tenth 

 is the anticlinal vertebra ; the spine is at first very oblique, but curves, and 

 in its upper portion is vertical. In other respects this vertebra is like its 

 predecessor. On the eleventh the spine is directed slightly forwards, but the 

 end is rounded like that of the anterior dorsals; the metapophyses have ap- 

 proached the median line so as to touch the post-zygapophyses of the tenth, 

 while the post-zygapophyses of the eleventh have assumed the cylindrical shape 

 found in the lumbar region. The twelfth and thirteenth vertebrae are much 

 like lumbars in their construction, and are distinctly longer than the three an- 

 tecedent vertebrae ; the spines have the nearly straight thickened free ends seen 

 in the lumbars, and the metapophyses have disappeared. The transverse pro- 

 cesses, however, are very short, though they still retain the rib-facets, even on 

 the thirteenth. 



The ribs, so far as can be judged from the fragments, are narrow and very 

 slender. Of course this may be true only of the posterior part of the series. 



The scapula is characteristically ruminant. The glenoid cavit}' is nearly round 

 and quite shallow, the coracoid process is prominent, recurved and thickened at 

 the end ; the neck is very long and much contracted, the borders sloping away 

 from it very gradually ; the coracoid border is thin and rounded at the edge, it 

 curves gently forwards and upwards from the neck ; the glenoid border is very 

 much thickened and somewhat overhanging, from the neck it is nearly straight, 

 and forms a right angle with the very thin suprascapular border. The spine 

 rises abruptly from the neck into the high acromion ; the latter overhangs very 

 slightly, in sharp contrast to the condition found in Aiitilocapra. The spine 

 divides the blade into unequal fossae, the prescapular being much the smaller, 

 as is ordinarily the case among the ruminants. Except for the nearly straight 

 inferior edge of the spine, and the consequent lack of an overhanging acromion^ 

 this scapula very closely resembles that of the prong-buck. 



Thehumerus has a broad and flattened head, which projects but little beyond 

 the shaft. The external tuberosity is laige, and curves over tlie deep bicipital 

 groove ; the internal tuberosity very small ; both are much less develo]ied than 

 the corresponding processes in Antilocapra. Proximally the shaft is broad and 

 compressed, below it is rounded and slender. No ridges for muscular attach- 

 ment are more than very faintly indicated. The distal end is broken away, but 

 in all probability it was like that of Blastonieryx described above. 



The pelvis is also entirely ruminant in character. The ilium has a short, deep, 

 and much compressed neck, expanding into a curved and stronglj' everted plate, 

 which projects a consideral)le distance in front of the sacral attachment. The 

 ilium is somewhat tiihedral in section, the median rounded ridge of the plate 

 being more prominent, and the expansion itself smaller than in the prong-buck. 

 The ischium is very long ; above the acetabulum its superior border shows the 

 convexity so usual in the recent ruminants, though in a less marked degree. 

 The tuberosity of the ischium is very long and prominent, and directed straight 

 outwards ; behind the tuberosity the ischium is prolonged further than in the 

 prong-buck. The cannon-bone belonging to this specimen is broken, and its 



