THE EXOSKELETOJJ. 43 



hairs, or as independent organs, in the form of sweat-glands, 

 musk-glands, or mammary glands. 



The color of the integument may arise from pigment- 

 granules, deposited either in the epidermis or in the dermis ; 

 and, in the latter case, it is sometimes contained in distinct 

 chromatophores, as in the ChamcBleon. 



