MR. W. Tv. PARKER OK THE SKULL IN THE MAMMALIA. 
PLATE 20. 
Figures. 
Number of 
times 
magnified. 
1 
Erinaceus europceus (5tli stage, continued) ; skull; lower 
view. 
3 
2 
The same ; upper view. 
3 
3 
The same ; side view. 
3 
4 
Erinaceus europceus ( 6 th stage); young, § grown ; section 
of skull. 
92 
Z 3 
5 
The same (part) ; with septum removed. 
9— 
z 3 
6 
Erinaceus europceus ( 8 th stage) ; sub-adult; posterior 
sphenoid ; upper view. 
9 l 
" 2 
7 
The same ; lower view. 
9 1 _ 
Z 2 
8 
The same ; end view, behind. 
9i_ 
Z 2 
9 
The same ; inferior (maxillary) turbinals ; front view . . 
Z 2 
10 
The same ; internal view. 
Ol 
Z 2 
