NIPPLE DEVELOPMENT OF PLACENTALS 113 



be incorrect, we still find these views repro- 

 duced in almost all textbooks of zoology and 

 comparative anatomy at the present time. In 



^^ 



Fig. 39. — Nipple Development of Placentals. 



(GrEGENBAUR AND KLAATSCH.) 



i?' y In the Eodents (Muridse). 



II. In the Prosiniae and Primates. 

 In the Camivora. 

 In the Ruminants. 



III. 

 IV. 



w. Areola mammee. 



particular, it is constantly repeated (c/i, for 

 example, Wiedersheim) that the nipples of the 

 Ruminants are pseudo-nipples, fundamentally 



8 



