MR. W. K. PARKER OK THE SKULL IK THE MAMMALIA. 
PLATE 18. 
Figures. 
Humber of 
times 
magnified. 
1 
Erinaceus europceus (1st stage); embryo, 1^ inch long; 
1st of a series of vertically-transverse sections 
11 
2 
The same ; 2nd section. 
11 
3 
The same ; 3rd section. 
11 
4 
The same ; 4th section. 
11 
5 
The same ; 5th section. 
11 
6 
The same ; 6th section. 
11 
7 
The same ; 7th section. 
12 
8 
The same ; 8th section. 
12 
9 
The same ; 9th section. 
12 
10 
The same; 10th section. 
8 
1—i 
f— 1 
The same ; 11th section. 
8 
12 
The same ; 12th section. 
8 
13 
The same ; 13th section. 
8 
14 
The same ; 14th section. 
8 
15 
The same ; 15th section. 
8 
16 
The same ; 16th section. 
8 
17 
The same ; 17th section. 
8 
OO 
H 
The same ; 18th section. 
8 
19 
The same ; 19th section. 
8 
20 
The same ; 20 th section. 
8 
21 
The same ; 21st section. 
8 
22 
The same ; 22nd section. 
8 
