IN MONOTEEMES AKD MARSUPIALS 89 



of nipples (thirteen or fifteen), we get a total 

 which approximates to the number of mammary 

 hairs and glands in the gland areas of the 

 Monotremes. 



A further result of this subdivision is that the 

 relatively few milk glands in connection with 

 each nipple, if they are to produce the amount 



Fig. 32. — Nipple Arrangement in " Phascologale 



FLAVIPES." (BRESSLAU.) 



of nourishment necessary for the young, must 

 attain to a far higher degree of development 

 than the mammary glands of the Monotremes. 

 Thus we obtain a rational explanation of the 

 remarkable diversity between the mammary 

 glands of the Monotremes and the milk glands 

 of the Marsupials. In my view these glands 

 are neither so completely homologous, as 



