THE PELVIS. 25 



column. This rectilinear direction of the pelvic axis is greatly to the ad- 

 vantage of animals during parturition ; so that the axis of this canal re- 

 quires but little notice from the veterinary obstetrist, except when the 

 passage is very constricted. 



Differences in the Pelvis according to Sex. 



There is a considerable difference in the size and conformation of the 

 male zxid female pelvis in the domesticated animals, the latter being larger in 



ft 



Fig. 10. 

 Pelvis of Mare. 



every sense, but more particularly in its transverse diameter. These 

 differences have only been carefully studied in the equine species, but 

 they exist in a somewhat similar degree in the pelvis of other species. 



Fig. II. 

 Pelvis of Horse. 



In the Mare, in addition to the pelvis being wider than that of the 

 Horse, the inlet is much larger, the ileo-pectineal crests are further apart, 



