596 
ME. W. K. PAEKEE ON THE STEUCTUEE AND DEVELOPMENT 
Number of 
Plate. 
Fig. 
Stage. 
diameters 
magnified. 
23 
1 
3rd | 
Skull of young (hatched) Axolotl, 51 lines long. 
| -20 
Upper view : . 
55 
2 
55 
The same. Lower view 
20 
g 
J 
Transversely vertical section (1st) of same skull 
| 20 
55 
” l 
through nasal sacs 
55 
4 
Same ; section (2nd) through front of eyeballs . . 
20 
55 
5 
55 
Same ; section (3rd) through middle of eyeballs 
20 
55 
6 
55 
Same ; section (4th) through hind part of eyeballs 
20 
„ 
7 
55 
Same; section (5th) through suspensorium . 
20 
8 
55 
Same ; section (6th) through part of ear-capsule . 
20 
24 
1 
6th 
Skull of young Axolotl, 21 inches long. Upper view 
8 
55 
2 
55 
The same. Lower view 
8 
,, 
3 
,, 
Part of upper view of same 
16 
5 5 
4 
Part of lower view of same 
16 
55 
5- 
9th | 
Skull of cryptobranchiate Axolotl, 81 inches long. 
Lower view 
} 
6 
10th | 
Skull of Amblystoma opacum , 3 inches 10 lines 
l 5 
long. Lower view 
J 
25 
1 
7 th 
Skull of young Axolotl, 31 inches long. Upper view 
5 
2 
55 
The same. Lower view 
5 
» 
o 
O 
8th j 
Skull of large Axolotl, full-gilled, 81 inches long. 
End view 
} 31 
4 
55 
Lower jaw of same. Inner view 
31 
5 
55 
Visceral arches of same. Lower view 
31 
55 
6 
10th 
Visceral arches of Amblystoma opacum. Lower view 
5 
55 
7 
55 
Lower jaw of same. Inner view 
5 
26 
1 
8th 
Skull of large Axolotl, 81 inches long. Upper view . 
31 
2 
The same. Lower view 
31 
o 
j 
The same, with investing bones removed. Upper 
} *k 
” 
O 
” ( 
view 
55 
4 
The same. Lower view 
31 
H 
55 
5 
„ 
Skull and visceral arches of same. Side view . 
27 
1 
9th | 
Skull and visceral arches of cryptobranchiate Axo- 
lotl, 81 inches long. Side view 
} 8* 
