INTEGUMENTAL GLANDS OF CROCODILIA 599 



Of the musk glands, the pair that opens into the cloaca is the 

 larger, though the glands that open by a slit on either side of 

 the ventral wall of the throat are of considerable size in large 

 animals. Like the dorsal glands, the musk glands are devel- 

 oped by an invagination of the lower layer of the epidermis and 

 their walls are composed of somewhat similar though more com- 

 pact layers of cells. The secretion, or musk, is a smooth, oily 

 substance with the powerful odor characteristic of that well- 

 known extract, and is doubtless used by the sexes, both of which 

 produce it, in locating and following each other during the breed- 

 season when the glands are said to be most active. 



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