120 E. S. Lull — New Tertiary Artiodactyls. 



Rind Limbs. 



Pelvis (fig. 1). Os innominatum. — One fairly well-pre- 

 served pelvis and others less perfect are present, the best 

 one being that in the mounted skeleton. It shows few 

 distinctive characters as compared with that of Antilo- 

 capra, except a greater simplicity of surface, in that the 

 muscle limitations are somewhat less pronounced. Few 

 relative dimensions can be given because of the imperfec- 

 tion of the fossils. Those available are : 



Aletomeryx Antilocapra 



m. m. Ratio 



Length over all -1300 -2430 1-87 



Right ilium, width, ant. end -0670 -0988 1-48 



Right ilium, least width -0133 -0223 1-68 



Acetabulum, ant.-post. diameter, 



inside rim -0160 -0293 1-83 



Right ischium, width, mid-length. -0150 -0237 1-58 



Av. 1-69— 



Femur (figs. 18, 19). — Herein again there are very 

 close resemblances between the fossil and the living 

 prongbuck, the differences as usual being of minor impor- 

 tance, such, for instance, as the somewhat greater slender- 

 ness of the great trochanter. These distinctions are best 

 seen in the figures, and in the following table of measure- 

 ments : 



Aletomeryx* Antilocapra 



m. m. 



Length over all -1460 -2330 



Prox. end, ant.-post. diameter -0160 0290 



Prox. end, transverse diameter .... 0350 -0575 



Mid-shaft, ant.-post. diameter -0130 -0193 



Mid-shaft, transverse diameter -0123 -0200 



Distal end, ant.-post. diameter 0365 -0580 



Distal end, transverse diameter .... -0293 -0455 



* Composite bone. 



Patella (fig. 24). — The patella of Aletomeryx is a vari- 

 able bone, but is in each instance prolonged downward 

 into an attenuated point, giving it a more markedly tri- 

 angular outline. 



Ratio 



1-60 



1-81 



1-64 



148 



1.62 



1-59 



1-55 



. 1-61 



