THE POSTERIOR LIMBS. 



135 



The following figures, relating to the capacity of the pelvis of the Mare and 

 Horse, confirm what has just been enunciated : — 



To recapitulate, there is observed in the pelvis of the Mare : — 



1. A great increase in the transverse diameters. 



2. A deep and regularly concave ischiatic notch. 



3. A wide and concave ischial arch. 



4. Circular obturator foramina. 



5. The cotyloid cavities distant from the pubic symphysis. 



In the Ass, the inlet of the pelvis is a longer oval than in the Horse. The 

 coxae are distinguished by : 1. The less curvature of the anterior border of the 

 ilium. 2. A slightly excavated external iliac fossa. 3. The triangular shape of 

 the obturator foramina. 4. A short and deep notch separating the external 

 border of the ilium from the angle of the haunch. .5. The direction of the 

 tuberosities of this angle ; they approach more nearly the parallelism with the 

 median plane of the trunk than in the Horse. 6. The disposition of the rugo- 

 sities in tubercles for the insertion of the suspensory ligaments of the corpus 

 cavemosiun on the inferior face of the ischium. In the Ass, also, a line which 

 would unite the inferior contour of the auricular facet to the most salient 

 point of the angle of the haunch, would be parallel to the anterior border of the 

 ilium, while it would be oblique on this border in the Horse. 



The inlet of the pelvis in the Hinny resembles that of the Ass ; in that of 

 the Mule, it holds a middle place between the Ass and Horse. The pelvis of 

 the Hinny resem})les that of the Ass, also, by the form of the obturator foramina, 

 the direction of the anterior border of the ilium, and the position of the auricu- 

 lar facet ; while that of the Mule, on the contrary, resembles the pelvis of the 

 Horse in these features. The reverse is noted with regard to the disposition of 

 the angle of the haunch. 



Differential Characters in the Pelvis of other Animals. 



It is remarked : 1. That in all the domesticated animals, with the exception of Solipeds 

 and the Camel, the direction of the coxse is nearly horizontal. 2. That in all, the ilium is 

 more oblique than in Solipeds. 3. Tliat in all, the transverse diameters of the pelvis are 

 relatively less extensive. 



A. Ruminants. — In the Ox, the space between the two coxse is scarcely so great in front 



