132 
SCANDINAVIAN FISHES. 
Length of the body in millimetres - 
1) Greatest depth of the body in % of the length of the body 
2) ,, „ „ „ ,, „ „ „ ,, distance between the first dorsal tin and the tip of the snout 
3) Length „ „ head „ „ „ „ length of the body 
4) „ ,, lowei jaw ,, ,, „ ■ ; „ ,, n ,, - - 
5) „ „ „ „ „ „ „ >, „ „ „ lead 
6) „ „ „ „ ,, „ ,, „ „ distance between the first dorsal fin and the tip of the snout 
7) „ „ „ „ „ „ „ „ „ length of „ second „ „ 
8) Longitudinal diameter of the eye ,, „ „ ,, „ „ the head — 
9) „ „ ,, ,, ,, „ „ „ „ least depth of the tail 
10) Distance between the first dorsal fin and the tip of the snout in % of the length of the body 
11) Length of ,, . . ,, .5 ,, n i} i) ,, „ ii u 
12) „ „ „ „ „ „ „ „ „ „ „ „ „ lower jaw 
13) „ „ „ „ „ ,, „ ,, „ „ „ ,, „ second dorsal fin.. 
14) Least depth of the tail in % of the length of the body 
10) 11 ii ii ii 55 ii ii ii ii ii ii ii head — 
16) ,, „ „ ,, „ „ „ „ „ distance between the first dorsal fin and the tip of the snout 
17) „ ,, „ „ „ ,, „ „ „ length of the lower jaw 
18) „ ,, „ „ „ „ „ „ „ „ „ „ first dorsal fin 
19) Length of the second dorsal fin ,, ,, „ „ „ „ body 
Trachinus 
vipera. 
Trachinus draco. 
Average. 
9 
2 cfc” + 1 9 
2 c?c? + 1 9 
83 
189 
229 
285 
21.i 
15.3 
17.3 
16.9 
94.6 
81.7 
93 9 
93.8 
24.7 
22.2 
22.5 
22.5 
14.7 
11.6 
11.9 
11.6 
59.5 
52.4 
52.9 
51.6 
66.o 
62.o 
64.6 
64.4 
33.6 
23.6 
23.9 
22.7 
24.4 
21.o 
20.5 
17.8 
83. * 
86.2 
77.i 
69.5 
22.3 
18.7 
18.4 
18,i 
lO.i 
9.4 
9.4 
9.5 
69.o 
80.9 
79.2 
81.7 
23.i 
19.i 
18.8 
18.7 
7.2 
5.4 
5.9 
5.8 
29.2 
24.3 
26.5 
25.6 
32.4 
28.7 
32.4 
32.o 
49.2 
46.4 
50.2 
49.6 
71.4 
57.3 
63.4 
60.5 
43.7 
49.2 
49.9 
51.i 
Where the ratios in this table run uniformly through 
all four columns, rising, as in 19, or falling, as in 8, 
they naturally indicate a common direction of develop- 
ment, in which our specimen of Trachinus vipera, as 
being least, represents the lowest stage ; but where this 
is not the case, especially where difference of sex in 
other fishes, too, takes a prominent place, as in 2, 6, 15, 
16 and 17, we see that Trachinus vipera — as far as we 
can judge from one specimen — represents a branch of 
development where the male characters are predominant. 
