MR. W. K. PARKER ON THE 
PLATE 18. 
SKULL IN THE MAMMALIA. 
Number of 
Figures. times 
magnified. 
1 _ Erinaceus europeus (1st stage); embryo, 1} inch long ; 
Ist of a series of vertically-transverse sections al 
2 | The same; 2nd section . itil 
1 The same; 3rd section . 11 
4 |The same; 4th section . Al 
5 |The same; 5th section . 11 
6 ' The same; 6th section . 11 
‘4 The same; 7th section . 12 
8 | The same; 8th section . 12 
9 |The same; 9th section . 12 
10 | The same; 10th section 8 
ill |The same; 11th section 8 
12 | The same; 12th section 8 
ites |The same; 13th section 8 
14 The same; 14th section 8 
15 | The same; 15th section 8 
16 The same; 16th section 8 
iy The same; 17th section 8 
18 The same; 18th section 8 
19 The same; 19th section 8 
2 The same; 20th section 8 
21 The same; 21st section 8 
22 The same; 22nd section 8 
