48 MAMMARY APPARATUS OF THE MAMMALIA 



The nipple-pouches, however, are not the 

 only depressions observable within the mar- 

 supium. Often there are other recesses, 



Fig. 15b. — Interior of the Pouch of the Virgin 

 Kangaroo in which the Lower Teat on the 

 Right Side has been Proddced by Artificially 

 Everting. (Morgan.) 



a, The membranous canal of the mammary gland, and projecting, b, 

 its papillary termin.ition ; c, the follicular aperture formed by the 

 opening of the canal, and through which the canal with its 

 papilla is pushed and everted. 



which enclose the nipple-pouches or the 

 everted nipples. Fig. 16 is a reproduc- 

 tion of a photograph of an adult female 

 of Sminthopsis crassicaudata, which shows 



