THOEACIC LIMBS 



VARIATIONS IN FORM AND DEVELOPMENT. 



561 



The greater tuberosity exhibits variations in its height above the 

 articular surface of the head. 



The deltoid ridge is occasionally very prominent ; it is usually 

 moderately well developed ; it may be entirely absent. In some speci- 

 mens the area of attachment of the tendon of the teres major and 

 latissimus dorsi muscle is elevated into a strong crest. Rarely the 

 upper limit of the area of origin of the brachialis anticus muscle on 

 the external surface is indicated by an oblique line passing from the 

 deltoid ridge downward and backward to the external border. 



The supracondyloid foramen varies in size and shape ; in some 

 specimens it is long and narrow, in others it is short and broad. It is 

 never absent. 



FIG. 434. 



THE SKELETON OF THE CAT. 



I have seen no cases of perforation of the lamina between the 

 supratrochlear and the olecranon fossa. 



The student should observe the striking difference in general 

 appearance which is exhibited by the long bones of different cats ; 

 some are smooth, dense, and delicately moulded, although all the 

 processes and muscular lines may be strongly developed ; others are 



fashioned more rudely and are rougher and more porous. The former 



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