MR. W. K. PARKER OK THE STRUCTURE AND 
Explanation of Plates. 
Stage. 
1st 
2nd 
3rd 
55 
55 
4th 
55 
Embryo of Lacerta agilis, 2f lines in total length . 
Embryo of Lacerta agilis, 3 lines inch) long 
Embryo of Lacerta agilis, 4 lines (■§■ inch) long. A 
vertical section of head. 
Head in vertical section, less than half, seen as a 
transparent object from the outside. 
The same, seen as an opaque object from within 
Head, seen from above. 
Head of an embryo of Lacerta agilis, whose total 
length was 5 lines. Oblique inferior view 
Head of another rather larger embryo, with inferior 
arches removed. Lower view. 
Number of 
diameters 
magnified. 
26 
26 
20 
15 
14 
55 
6 th j 
55 
55 
Right and left views of the entire embryo whose 
head is drawn in Plate 37, fig. 7. 
Side view of the head of an embryo of Lacerta 
agilis, whose head was 2 lines (<1 inch) long . 
The same head. • Lower view. 
Head of embryo of Lacerta agilis, g inch long 
from snout to occiput. Side view. 
Upper view of same. 
Lower view of same .. 
20 
10 
10 
10 
10 
10 
5 th 
6tli 
55 
55 
Same as Plate 38, figs. 3 and 4. Lower view, with ) 
palate dissected.) 
Same as Plate 38, figs. 5-7. Lower view, palate ) 
dissected longitudinally.) 
Same head, in vertical section. 
Same-sized embryo. Transversely vertical section ) 
through nasal sacs. (1st section).i 
The same, through fore part of eyeball. (2nd sec- / 
tion).) 
The same, a little further back. (3rd section) . 
12 
12 
12 
18 
18 
18 
