186 Annals of the Carnegie Museum. 



ccenopus, a later form. There are no differences, requiring mention 

 between the unciform in P. niontaniis and P. carriken. 



The metacarpals have the same short, stout, and broad appearance 

 as those of P. montaniis; the lateral ones are relatively longer and 

 perhaps somewhat heavier than in the latter species, imparting to 

 the manus of Promerycockcerus as great, if not a greater breadth and 

 shortness, suggestive of the hippopotamus, as was observed by Pro- 

 fessor Scott. The second metacarpal, as already stated, differs from 

 that of P. montanus only by being slightly longer and heavier and by 

 the apparent absence of the small facet for the trapezium on the 

 "postero-external angle of the head," to which Scott refers in his 

 description. The third metacarpal is similar in all particulars to that 

 in P. montanus, as is also the fourth. The fifth metacarpal is very 

 little shorter than the second, and differs from that of P. montanus 

 only in its relative length and size. 



As in the latter species the phalanges are short, depressed, and 

 flattened, the unguals are especially short, expanded laterally, and 

 recall those of some species of the rhinoceroses. The phalanges of 

 the third and fourth digits are of equal size, while those of the second 

 are somewhat larger than those of the fifth digit. 



Measurements. 



No. 1080 

 (Type) No. 108 1, 

 Mm. Mm. 



Scapula, height 233 



Scapula, antero-posterior diameter at vertebral border. ... 146 



Scapula, antero-posterior diameter at neck 37 



Scapula, depth of spine 38 



Scapula, antero-posterior diameter of glenoid cavity 50 



Scapula, transverse diameter of glenoid cavity 44 



Humerus, greatest length 250 



Humerus, antero-posterior diameter of head 83 



Humerus, transverse diameter of head 68 



Humerus, transverse diameter of distal end 72 60 



Humerus, antero-posterior diameter of distal end 46 47 



Radius, greatest length 1 75 



Radius, antero-posterior diameter of head, approximateh^. 25 



Radius, transverse diameter of head, approximately 43 



Radius, transverse diameter of distal end 45 



Radius, antero-posterior diameter of distal end, approxi- 

 mately 25 



Ulna, greatest length 245 



Ulna, length of olecranon process 55 



