MR. W. K. PARKER OX THE SKULL IX THE MAMMALIA. 
PLATE 22. 
Humber of 
Figures. 
times 
magnified. 
i 
Erinaceus europceus (a series of stages of visceral arches); 
deep and superficial mandible and ear-drum ; inner 
view (1st stage) ; embryo ; 1^ inch long. 
8 
2 
The same ; fore part of deep mandible ; upper view . 
16 
3 
The same ; hyoid arch ; oblique view. 
8 
4 
2nd stage ; embryo ; 2^ inches long ; deep and super- 
ficial mandible ; and ear-drum ; inner view .... 
6 
5 
3rd stage ; ripe young ; 2-g- inches long ; the same parts ; 
inner view. 
J 3 
6 
The same ; hyoid arch ; upper view. 
°3 
7 
4th stage ; young, 2 weeks old ; the same parts ; inner 
view. 
, 4 
8 
5th stage ; head, 1^ inch long ; same parts ; inner view . 
3 
9 
The same ; hyoid arch ; upper view.. 
3 
10 
7th stage; f grown ; ear-drum ; outer view. 
8 
11 
The same ; inner view. 
8 
12 
8th stage ; adult; malleus ; outer view. 
8 
13 
The same ; annulus tympanicus ; outer view. 
8 
14 
The same ; hyoid arch ; upper view. 
2 2 
z 3 
