454 CHORDATA. 
carnosus, 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. 
x 
p 
on 
ans 
—_——  +-F 
— 
= 
ima 
. dacs oa 
3 See 
. De eel 
as sie 
= 
a, Say 
ic} 
g 
3 
- 
—_ 
ero, fs 
3 
i MBUDORIFIC Sree =. 
RV DORIFLE GLAND, ; 25 
pi 
VAs ge 
tC 8 
y 
=] 
Cs 
-§2. 
ih Set 
2G 
g 
(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 
