490 
MR. W. K. PARKER ON THE DEVELOPMENT 
Plate. 
Fig. 
Stage. 
Number 
of times 
magnified. 
32 
3 
4 
Part of basis-cranii of same skull; upper view. . 
36 
4 
4 
Section of the bead of an embryo of tbe same stage . 
24 
99 
5 
4 
Upper view of bead of same stage. Seen partly 
as a transparent object. 
24 
99 
6 
4 
Part of hyoid arcli of same. 
24 
33 
1-13 
4 
A series of vertically transverse section of an 
embryo, 1 inch long (nearly). 
27 
55 
14-16 
5 
First three of a series of vertically transverse 
sections of a 3 7 oung Lepidosteus 2jt inches long . 
20 
34 
1 
5 
Dissection of skull of young Lepidosteus, 2 inches 
long; chondrocranium with some of the paros- 
toses attached ; upper view. 
12 
jj 
2 
5 
The same object; lower view. 
12 
99 
3 
5 
Part of basis cranii of same skull; upper view . . 
1*5 
55 
4 
5 
Inferior arches of the same skull. 
12 
35 
1-12 
5 
4th to 15th of a series of vertically transverse 
sections of a young Lepidosteus, inches long. 
20 
36 
1-8 
5 
16th to 23rd of a series of vertically transverse 
sections of a young Lepidosteus , 2\ inches long. 
20 
99 
9 
5 
Part of fig. 8 . . . . 
60 
37 
1 
6 
Skull of a young Lepidosteus 4 inches 5 lines long, 
with superficial bones in situ; side view . 
6 
99 
2 
6 
The same skull; upper view. 
6 
55 
3 
6 
The same ; lower view. 
6 
55 
4 
6 
The inferior arches of the same skull; outer view . 
71 
38 
1 
6 
Chondrocranium of a young Lepidosteus 4 inches 
5 lines long; upper view. 
55 
2 
6 
Hind part of same ; lower view . 
6 f 
55 
3 
6 
Part of‘ basis-cranii of same ; upper view . . . 
13i 
4 
6 
Part of chondrocranium of same ; upper view . . 
13i 
5 
6 
Inferior arches of the same skull ; inner view . . 
H 
