OF THE MARSIPOBRANCH FISHES. 
407 
Description of the Plates. 
Plate. 
Fig. 
Number of 
times 
magnified. 
8 
1 
Embryo of Petromyzon planer i, 7'8 millims. long; side 
view . 
33 
55 
2 
The same ; part of upper view . 
33 
55 
3 
The same ; part of lower view . 
33 
55 
4 
Larva of Petromyzon Jluviatilis, 2 inches long (nearly); 
side view . 
5 
55 
5 
The same ; part of upper view . 
5 
55 
6 
The same ; part of lower view . 
5 
5 5 
7 
Adult Myxine glutinosa ; side view . 
Natural size 
55 
8 
The same ; part of upper view . 
Natural size ! 
5 > 
9 
The same ; part of lower view . 
Natural size 
5 5 
10 
Adult Petromyzon mcirinus; lower view of head. 
Natural size ■ 
55 
11 
Adult Petromyzon Jluviatilis; lower view of head . 
2 
55 
12 
The same; side view of head . 
2 
5 5 
13 
The same ; upper view of head . 
2 
55 
14 
Adult Petromyzon planeri; side view of head 
2 
? 5 
15 
The same ; lower view of head. 
2 
55 
16 
The same ; upper view of head. 
9 
Li 
9 
1 
Adult Myxine glutinosa; dissection of fore part; side 
view. . 
H 
55 
2 
The same dissection (part). 
5 
55 
3 
The same ; lower view. 
5 
55 
4 
The same ; further back ; lower view. 
5 
10 
1 
Adult Myxine glutinosa; skull, upper view .... 
5 
55 
2 
' The same, with base exposed. 
5 
5 5 
3 
The same ; lower view. 
5 
55 
4 
Newly transformed Petromyzon marinus (4 inches 
long); skull, upper view. 
1 OP 
1 2 
55 
5 
The same ; lower view. 
1 24 
55 
6 
The same ; inferior labials ; lower view. 
I 91 
1 ^2 
5 5 
7 
j 
The same ; framework of “ inferior velum .... 
15 
1 
3 G 2 
