SKIN AND REPRODUCTIVE ORGANS OF NOTORYCTES. 341 



The sebaceous glands are very well developed, especially 

 around tlie circumference of the mammfe. Beneath the 

 mammae the dermis extends even more deeply than elsewhere, 

 and contains numerous mucous ducts. The mammary ducts, 

 three to four in number, open close together on the apex of 

 each mamma, and have, in a marked degree, the characters 

 of sudoriparous glands, as opposed to sebaceous glands ; so 

 that, as in Monotremes [2, p. 40] the mammary glands and 

 sweat glands are apparently homologous in Notoryctes also. 



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