Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
DEVELOPMENT OF THE SKULL IN THE CROCODILIA. 305 
DESCRIPTION OF THE PLATES. 
PLATE LXII,. 
. Alligator mississipensis, Daudin (1st Stage): total length 11 lines (head 3, 
body 5, tail 3). Side view of embryo, x 6 diameters. 
. The same, lower view of head, x 6 diam. 
. Alligator mississipensis (2nd Stage): total length 14 inch (head 4 lines, body 6, 
tail 8). Side view of embryo, x 6 diam. 
4. The same, lower view of head, x 6 diam. 
5. Crocodilus palustris, Lesson (3rd Stage): total length 2 inches (head 6 lines, 
iG), 
g. 10 
5 lui 
~ 12 
A dls) 9 
. 14. The same, upper view of head, x 2 diam. 
Oo LO 
body 8, tail 10). Side view of embryo, x 3} diam. 
. The same, upper view of head, x 324 diam. 
. The same, lower view of head, x 34 diam. 
. Crocodilus palustris (5rd Stage): total length 24 inches (head 5 lines, body 10, 
tail 12). Side view of embryo, x 24 diam. 
The same, upper view of head, x 24 diam. 
. Crocodilus palustris (4th Stage): total length 34 inches (head 11 lines, body 
13, tail 18). Upper view of head of embryo, xX 2 diam. 
. The same, side view of head, x 2 diam. 
. Alligator mississipensis (5th Stage): total length 43 inches (head 1 inch), 
x 2 diam. 
. The same, front view of head, x 2 diam. 
PLATE LXIII. 
. Alligator mississipensis (1st Stage). Head of embryo, with lower arches 
removed; lower view, X 124 diam. 
. The same, with lower surface of base of skull exposed, x 123 diam. 
. Alligator mississipensis (2nd Stage). Head of embryo, with lower arches 
removed, x 10 diam. 
The same, with lower surface of base of skull exposed, x 10 diam. 
. The same, base of skull, oblique view, X 15 diam. 
. The same, dissected head of embryo, upper view, x 10 diam. 
. The same, head of embryo, in vertical section, x 10 diam. 
‘The same object, with brain removed, x 10 diam. 
3a 2 
