SKELETON OF ARTIODACTYLA. 



485 



Pelvis of Ox (Bos). 



The Harderian groove of 

 and breaks through the border 



Deer. In the Ox, fig. 332, the symphysis pubis is placed ob- 

 liquely, so as to cause the anterior pelvic opening to be longer 

 than the posterior one : in the Deer, fig. 333, the symphysis runs 

 more parallel vdth the sacrum. The acetabula are carried by the 

 length of the ilia opposite the last sacral vertebra, at the apex of 

 the wide arch of the os innominatum : the plane of the aperture is 

 inclined about 40° from the perpendicular. In the Cow, near the 

 period of parturition, the 

 ischial tuberosities, by the 

 relaxation of the lio^aments 

 and sinking of the sacrum, 

 become more protuberant 

 than at other times. In 

 the Giraffe the posterior 

 concavity between the 

 ilium and ischium, as in 

 the Deer, fig. 333, is 

 scarcely interrupted by 

 the prominence of the con- 

 joined bones above the acetabulum 

 the acetabulum is wide and deep, 

 of that cup. 



The hind-limb, fig. 330, B, exceeds the fore-limb, ib. A, in 

 length in all Ruminants : 

 least so in the CamelidcB 

 and Giraffe, most so in 

 the bounding Deer and 

 Antelopes. 



The femur of Rumi- 

 nants, ib. B, 1, as of other 

 Artiodactyles, has no third 

 trochanter ; and the me- 

 dullary artery enters the 

 fore part of the shaft, us- 

 ually at the upper third, 

 and ofoes downward and 

 backward to the medullary cavity : the antero-posterior expanse 

 of the distal end is great, especially in the Giraffe : and the 

 inner border of the rotular channel is more produced than in the 

 Hog-tribe, without developing an irregular prominence as in the 

 Perissodactyles. The Camelidce offer the exception in the position 

 of the foramen and canal of the mcduHary artery, and in the sub- 

 equal development of the borders of the rotular channel. The 



333 



Pelvis of Stag (Cervus). 



