6o 



TRANSACTIONS OF WAGNER 



PROCAMELUS 



The remaining nine astragali are referable to the largest associate species, 

 the P. major. The specimens differ among themselves slightly in size and 

 other points. One of them is represented in plate xviii. fig. I. They are 

 much larger than in the Camel, and they strikingly differ in the separation of 

 the calcanean articular surfaces by the conspicuous groove or step, variable in 

 character in the different specimens. 



The measurements are as follows : 



Astragalus of P. major. i. 2. 3. 4. 5- 



Length externally . .100 mm. 98 mm. 102 mm. 98 mm. 

 Length internally . 93 " 9 2 " 94 " 9^ nlnl - 



Breadth of tibial trochlea . 60 " 58 " 59 " 59 " 



Breadth of distal extremity 66 " 64 " 71 " 67 " 



Astragalus of P. major. 



Length externally 

 Length internally 

 Breadth of tibial trochlea 

 Breadth of distal extremity . 



100 mm. 101 mm. 96 mm. 98 mm. 



96 " 95 " 89 " 89 " 



59 " 61 " 58 " 67 " 



66 " 67 " 63 " 66 " 



METATARSALS. Of five specimens of upper extremities of metatarsals in 

 the collections from Mixon's referable to Procamdus, three belonged to P. 

 minimus, the others to P. major. The former are all of the right side, and 

 therefore belong to as many individuals. The best preserved specimen per- 

 taining to this species is represented in plate xvi. fig. I. It is a foot in 

 length, and when complete was about fifteen inches, indicating a proportion- 

 ately longer foot than in the living Llama. The specimens all accord in 

 anatomical character with the corresponding part of the same bones in the 

 latter. 



Measurements of the specimens are as follows : 



Breadth transversely 

 Breadth fore and aft internally 

 Breadth fore and aft externally 



P. minimus. 



41 mm. 



38 " 



37 " 



P. major. 



81 mm. 

 62 " 

 62 " 



PHALANGES. Plate xviii. figs. 2 to 6 and 8 to 10. A number of phalanges 

 are present belonging to the species named Procamdus major, several ascriba- 

 ble to P. minimus, but only one entire phalanx and the proximal portion of a 

 second of P. medius. These phalanges are all of the Llama type, the proxi- 

 mal phalanges being longer, more slender, and much less expanded at the 

 distal end than in the camel. In this respect, however, P. major is somewhat 



