Xo. 571] 



PAT IE EX DEVELOPMENT 



409 



draw apart first across the forehead making here a tri- 

 angular white mark, and on the muzzle, as in Fig. 34. 

 Further restriction broadens these white marks and joins 

 them by a narrow isthmus as in Fig. 35. In Fig. 40, the 

 two patches are still conjoined across the vertex, but are 

 much reduced, that of the right side more than that of the 

 left. In Fig. 42 they have failed to join medially, though 

 fairly well developed longitudinally. Still greater re- 

 duction, as in Fig. 37, confines them to the ears, the bases 

 of which appear to be the ultimate centers. 



The neck patch in the cow is more extended posteriorly 

 than in the horse, and its center is strictly lateral rather 

 than nearly ventral. It is shown in Fig. 34 somewhat 

 contracted from the mid-line of the throat, but extends 

 squarely back against the foreshoulder at the base of the 

 neck, and is fused near its ventral corner with the 

 small shoulder patch, itself much reduced. As in 

 other mammals it appears to extend in its complete 

 development, to the front edge of the upper foreleg. The 

 animal in Fig. 41 shows a bilaterality in its pigmentation 

 that is rather unusual. What appear to be the reduced 

 neck patches are seen far back at the border of the fore- 

 shoulder. In Fig. 40 the left-hand neck patch has 

 dropped out, but that of the right side is still present, 

 though small, and in Fig. 42 it is reduced to a small spot 

 only. 



The shoulder patch in cows is remarkably narrow, 

 and compressed between the neck patch and the body 

 patch, whence it extends as usual on to the foreleg. In 

 Fig. 33 a primary break back of the foreshoulder marks 

 the nearly vertical posterior outline of the shoulder 

 patch. In Fig. 34 the separation of this area from the 

 neck patch is all but complete and the patch itself some- 

 what reduced. Its narrow vertical outline is thus indi- 

 cated, as well as in Fig. 39, in which there is a narrow 

 tongue-like extension down on to the center of the foreleg. 



In its further reduction it appears as a small center 

 at the base of the scapula, as in Fig. 35, or in Fig. 40, in 



