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57 



Their comparative measurements are as follows : 



p. minimus. P. majo 



Depth from coracoid process to 



lower border of glenoid fossa 

 Height of glenoid fossa 

 Transverse breadth 



Humerus. — A mutilated proximal end of the humerus of/-", major accords 

 in anatomical character with the corresponding portion of the same bone in 

 the Llama. 



Its comparative measurements are as follows : 



Breadth fore and aft of the head 

 Breadth from side to side , 



Of six specimens of the distal extremity of the humerus in the collection 

 three belong to P. minimus and three to P. majm\ They likewise accord with 

 the corresponding portion of the same bone in the Llama. 



Their comparative measurements are as follows : 



P. minimus. P. major. A. llama. 



Breadth of the distal articulation 50 mm. 95-102 mm. 42 mm. 



Radius and Ulna. — Plate xv. figs. 9 and 10. Ten specimens in the col- 

 lections from Mixon's plantation are extremities of forearm bones, which 

 closely accord in anatomical character with corresponding portions of the 

 same bones in the living Llama. From their proportionate sizes four pertain 

 to P. minimus, one to P. mcdiiis, and the remainder to P. major. Of the first, 

 two are mutilated proximal extremities, the others the complete distal extremi- 

 ties, of which one is represented in plate xvi. fig. 3. The second is a distal 

 extremity, represented in plate xv. fig. 10. The last consist of a mutilated 

 upper extremity, two complete distal extremities, of which one is represented 

 in plate xv. fig. 9, and the detached epiphyses of two others of the latter. 



The comparative measurements of specimens of the distal extremities of 

 the bones are as follows : 



P. minimus. P. medius. _P. major. Llama. 



Extreme breadth . . . 59 mm. 54 mm. 76 mm. 122 mm. 45 mm. 



Extreme fore and aft diameter 40 " 37 " 52 " 77 " 31 " 

 Breadth of the carpal articu- 

 lation . . . . 48 " 43 " 69 " 100 " 35 " 



. Carpus. — Of the bones of the carpus referable to the species of Atichenia 



