456 Mr. Mougan's Description of the Anatomy 



lower mammary glands. Each of these canals was described as 

 terminating at one extremity by an open mouth upon the sur- 

 face of the skin, the opposite end of the tube being closed by a 

 papillary projection (the future nipple). The lining membrane 

 of that tube was represented as forming a sort of pouch from 

 its reflection over this papillary termination. Thus in the de- 

 velopment of the inferior teats on each side, the membranous 

 tube or canal becoming everted from the protrusion of the im- 

 bedded nipple through its external opening, its lining membrane 

 must necessarily be turned inside-out to form a cutaneous cover- 

 ing for the protruded teat. This process of eversion, which is 

 somewhat similar to the replacement of an inverted finger of a 

 glove, is peculiar to marsupial animals. 



In the paper to which I refer, I have also stated that the 

 inferior mammary glands on each side are very much larger 

 than the upper ones ; that the young of the animal when first 

 received into the pouch is invariably found attached to one of 

 the two lower teats ; and that the milk during the whole period 

 of suckling is furnished by the inferior mammae. The upper 

 teats, which I had found perfectly developed in the half-grown 

 subject, were compared to those supernumerary organs of the 

 same kind which are so frequently met with in other mammife- 

 rous quadrupeds. I have thought it necessary to refer thus far 

 to my first paper on this subject, in order to render the details 

 of ray present communication more clearly understood. In the 

 month of October, 1828, I obtained a living female kangaroo, 

 the pouch of which contained a young one still adhering to the 

 marsupial teat, the size of the young at the time being about 

 equal to that of a small rat ; its skin was entirely destitute of 

 hair, of a light flesh colour, and constantly lubricated by a viscid 

 moist secretion of a brownish red colour, which secretion was 

 spread also over the whole of the interior of the pouch. 



Since 



