124 R. S. Lull — Neiv Tertiaty Artiodactyls. 



Metatarsus. — The cannon-bone (figs. 21-23) differs 

 mainly in the somewhat greater relative width of the 

 distal end and in the very distinct triangular groove for 

 metatarsal V. Two examples of the latter are present, 

 both from the left side and differing considerably in size. 

 Metatarsal II (fig. 23) is present, but coalesced with* the 

 cannon-bone. It tapers to a point distally and varies 

 materially in its length and other dimensions. 



Dimensions of the cannon-bone are : 



Aletomeryx Antilocapra 



m. m. Eatio 



Length over all -1400 -2200 1-57 



Proximal end, ant.-post. diameter . . -0160 0253 1-58 



Proximal end, transverse diameter . -0157 -0256 1-63 



Mid-shaft, ant.-post. diameter -0107 -0165 1-54 



Mid-shaft, transverse diameter. . . . -0096 -0150 1-56 



Distal end, ant.-post. diameter -0128 0195 1-52 



Distal end, transverse diameter.... -0195 -0280 1-43 



Av. 1-54 



Phalanges (fig. 22). — Whether or not lateral digits 

 were present I am unable to say. Certainly the manus 

 bore them, but there is no discernible evidence of their 

 presence either on the cannon-bone or in the material 

 itself, as these elements are extremely rare, due no doubt 

 to their minuteness. The little distinction discernible 

 between the phalanges of manus and pes is discussed 

 above (see under manus). The length of the entire hind 

 limb extended is : 



Aletomeryx Antilocapra Eatio 



•537 m. -850 m. 1-58 



Of the extended fore limb : 



Aletomeryx Antilocapra Eatio 



•420 m. -720 m. 1-71 



The hind limbs are therefore proportionately longer 

 in Aletomeryx, which is in keeping with their relatively 

 more advanced condition as compared with the more con- 

 servative four-toed fore limb. 



