454 



CHORD ATA. 



carnosuSy whilst the fat is concentrated as a layer at the 

 base of the dermis, called the panniculus adiposus. This 

 layer is enormously developed in most aquatic mammals 



Fig. 320.— Section Through the Skin of a Mammal. 



p o 





(whales and seals). The skin-glands really belong by origin 

 to the stratum mucosum of the epidermis and arise from it 

 in the embryo ; but as development proceeds they protrude 

 downwards into the dermis and become much coiled in 



