456 Mr. Moncae'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 mamme. 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- 
tous quadrupeds. I have thought it necessary to refer thus far 
to my first paper on this subject, in order to render the details 
of my 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. alight flesh colour, and constantly lubricated by a viscid 
moist secretion of a brownish red colour, which secrétion was 
spread also over the whole of the interior of the pouch. 
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