of the Mammary Organs of the Kangaroo. 463 



that from these alone does the future young receive nourish- 

 ment ; that each of the four teats exists prior to its external 

 appearance in the form of a follicular membranous canal, ter- 

 minated by a projecting nipple, which becomes everted and 

 protruded from its imbedded situation in the mammary gland, 

 to form a permanent medium of communication between the 

 mouth of the young and the secreting gland from which its 

 nutriment is derived. 



EXPLANATION OF TAB. XXVI. 



Fig. 1. A view of the interior of the pouch of a young kangaroo, 

 showing the four follicular apertures through which the 

 future teats are protruded. 



Fig. 2. Dissection of the mammary organs of the same, showing 

 the glands, membranous canals, and imbedded and unde- 

 veloped nipples. 



VOL. XVI. 3 XXV. On 



