TRANSACTIONS OF WAGNER 

 58 



PROCAMELUS 



in the collections from Mixon's plantation, there are fifty-four isolated speci- 

 mens. Of these, forty-six are referable to A. major, consisting of eleven 

 scaphoids, five lunars, seven cuneiforms, four pisiforms, one trapezoid, ten 

 magnums, and seven unciforms. One is a magnum of P. inedius, and the rest 

 pertain to P. ininiinus, consisting of two scaphoids, one lunar, one cuneiform, 

 two pisiforms, and one magnum. The bones accord pretty closely in anatomi- 

 cal character with those of the living Llama. All of them, however, are distinct 

 or separate, from which we may infer that they permanently continued in this 

 state, whereas in the Llama ordinarily we find the scaphoid and lunar and the 

 magnum and trapezoid co-ossified. 



Metacarpals. — Three specimens in the collection from Mixon's are ■ 

 upper extremities of metacarpals, representing the three species of Procainelns. 

 The best preserved specimen, about seven inches in length, pertains to P. 

 minimus, and is represented in plate xvi. fig. i. All accord in anatomical 

 character with the corresponding part of the same bones in the living Llama. 



Measurements of the specimens are as follows : 



Breadth transversely 



Breadth fore and aft internally 



Breadth fore and aft externaly 



Patella. — Fourteen patellae in the collections from Mixon's plantation 

 present the anatomical character of the bone in the living Llama. Four of 

 them are proportioned in size with the P. minimus, two with the P. incdius, 

 and eight with the P. major. 



Comparative measurements of specimens are as follows : 



p. minimus. P. medius. P. major. Llama, 



Extreme length . 63 mm. 61 mm. 89 mm. 122 mm. 117 mm. 104 mm. 55 mm. 



Extreme breadth . 33 " 32 " 48 " 58 " 56 " 49 " 26 " 



Thickness . . 27 " 29 " 43 " 59 " 55 " 44 " 22 " 

 Length of articular 



surface . • 55 " 60 " 80 " 98 " 102 " 100 " 45 " 

 Breadth of articular 



surface . . 3° " 3° " 38 " 5° " 53 " 44 " 22 " 



Tarsus. — Of smaller bones of the tarsus referable to Procamclus in the 

 collections from Mixon's there are twenty-six isolated specimens. Of these, 

 twenty pertain to P. major, consisting of nine cuboids, of which seven are of 

 the left side, five naviculars, four ecto-cuneiforms, and two meso-cuneiforms. 



