906 
SCANDINAVIAN FISHES. 
ft: Length of the lower jaw less 
than the ■ least depth of the 
tail Coregonus polcur. 
aa: Length of the maxillaries 
more than V \ of that of the 
head and than 36 % of that 
of the head reduced — Cor. 
polcur. 
bb: Leno'th of the maxillaries 
O 
less than i / i of that of the 
head and than 36 % of that 
of the head reduced — Cor. 
braehymystax. 
Instead of describing these forms at length we 
shall refer the reader to the two following tables of 
averages, the first intended to show both the difference 
of form and sex and the changes of growth in the 
three forms, of which we have examined a sufficient 
number of male and female specimens of various ages 
to enable us to trace the last-mentioned changes. 
Aver 
age 
N i 1 s s 
o n i i 
1 
V a r t m a n n 
i. 
La 
v a r e 
t u s. 
9 
& 
9 
c? 
? 
cf 
Length of the body expressed in millimetres (ab in tig. 228) 
184 
257 
161 
253 
184 
314 
167 
253 
147 
320 
82 
163 
305 
„ „ head (ac) 
in % of the length 
of the body 
20.7 
19.9 
20.8 
19.7 
20.i 
19.6 
21.5 
18.9 
20.6 
19.6 
21.i 
19.9 
19.5 
,, „ „ „ reduced (ad) 
7? ff ff ff ff 
99 99 
15.7 
14.6 
15.8 
14.7 
15.3 
14.8 
16.o 
14.3 
15.5 
14.7 
15.8 
14.8 
14.6 
Distance between the dorsal fin and the 
tip of 
the snout (aq) 
ff y> ff 
„ „ „ 
43.5 
44.o 
42.7 
43.2 
42.8 
43.6 
44.o 
42.6 
43.5 
44.3 
43.6 
43.0 
43. s 
Base of the dorsal fin (qr) 
ff ff ff ff ff 
99 99 99 
ll.i 
10.7 
11.0 
11.5 
ll.i 
12.3 
10.8 
10.8 
10.5 
11.0 
11.2 
11.9 
11.5 
Height ., ., ,, „ (st) 
ff f> ff ff ff 
9 9 9 > 99 
15., 5 
15.4 
15.7 
15.8 
15.i 
15.8 
15.o 
14.7 
14.7 
15.4 
11.7 
14.5 
14.8 
Length of the pectoral fins ( uv ) 
ff ff ff ff ff 
„ „ „ 
13.8 
14.2 
15.i 
15.2 
14.4 
15.2 
15.9 
15.5 
13,i 
15.1 
12.3 
13.i 
15.3 
Preabdominal length (uw) 
99 99 99 
27.5 
28.6 
26.5 
27.7 
29.0 
29.2 
27.o 
28.9 
27.9 
29.6 
28.2 
(27.9) 
28.5 
Distance between the ventral fins and the 
tip of 
the snout (aw) 
ff ff ff ff ff 
99 99 99 
47.9 
47.4 
47.i 
46.9 
47.8 
48.7 
47.i 
46.9 
48.2 
49.i 
48.4 
47.7 
44.4 
Length of the ventral fins (wx) 
ff ff ff ff ff 
99 99 99 
13.8 
14.3 
14.6 
14.6 
14.i 
14.3 
14.1 
14.4 
13.3 
14.3 
11.4 
13.i 
14.2 
j Postabdominal length (wy) 
fj 19 9) 
» „ „ 
25.6 
26.o 
24.6 
25.8 
24.9 
26.9 
24.6 
25.7 
24.4 
26.o 
23.5 
24.7 
25.9 
Distance between the anal fin and the 
tip of 
the snout (ay). 
ff ff ff ff 
ff ff ff 
71.2 
71.4 
70.3 
71.i 
71.6 
73.7 
71.o 
70.6 
71.3 
73.4 
70.7 
71.3 
72.s 
Base of the anal fin (yz) 
99 99 99 99 99 
ff ff ff 
11.3 
11.3 
12.i 
12.i 
10.7 
10.7 
10.7 
11.7 
10.8 
11.0 
10.1 
10.7 
11.0 
Height „ „ „ («/?)..... 
99 9 9 99 99 99 
ff ff ff 
9.8 
10.5 
10.1 
10.7 
9.9 
10.4 
lO.o 
10.1 
8.7 
10.1 
7.1 
8.8 
lO.i 
] Dorsal margin of the peduncle of the tail (yd).. „ „ „ „ ,, 
ff ff ff 
9.9 
9.1 
10.2 
9.1 
9.3 
8.9 
10. o 
9.3 
10.i 
9.0 
9.8 
9.7 
8.7 
Length „ „ ,, „ „ „ 
,, ,, ,, 
ff ff ff 
14 i 
13.5 
10.6 
13.7 
13.2 
13.3 
13.3 
13.3 
13.3 
13.2 
13.o 
13.4 
13.5 
Ventral margin,, „ „ „ „ „ 
{ZS) .. ,, ,, ,, ,, 99 
ff ff ff 
9.2 
8.9 
9.5 
8.9 
9.3 
8.6 
9.7 
9.4 
9.6 
8.5 
9.3 
9.6 
8.7 
Least depth ,, ,, ,, „ „ ,, 
(b 7 ?)-- 99 99 99 9 9 99 
„ „ „ 
6.8 
7.4 
7.o 
7.5 
7.o 
7.4 
6.8 
7.2 
6.4 
7.2 
6.i 
6.7 
7.i 
| Length of the middle caudal rays (, 9h) 
99 99 99 99 99 
99 99 99 
5.2 
6.2 
5.5 
5.9 
5.9 
5.4 
5.9 
5.8 
5.6 
5.4 ’ 
6.3 
5.5 
5.4 
„ ,, „ longest rays in the upper 
caudal 
lobe (ix) 
99 99 99 99 99 
„ „ „ 
— 
20.3 
17.5 
19.8 
18.9 
19.2 
19.3 
18.5 
16.i 
18.4 
- 
17.5 
18.3 
| Length of the snout (ay) 
99 99 99 99 99 
„ „ head 
24.3 
25.i 
24.8 
24.9 
24.8 
26.o 
25.i 
25.o 
25.5 
27.3 
23.8 
25.7 
22.s 
Longitudinal diameter of the eyes (gli) 
99 99 99 99 99 
99 99 99 
25.3 
22.6 
26.9 
23.1 
24.7 
21.2 
25.2 
22.2 
25.2 
20.8 
27.7 
24.6 
21.i 
Vertical ., (ef) 
99 99 99 99 99 
99 99 99 
22.3 
19.4 
22.6 
19.9 
22.7 
18.2 
21.3 
18.6 
21.3 
18.i 
23.6 
21.2 
18.5 
Breadth ofthe snoutatthe rostral protuberances(rt,n 2 ) ,, ,, „ ,, „ 
99 99 99 
16.5 
16.i 
17.0 
16.5 
14.6 
16.o 
15.3 
15.9 
16.o 
15.9 
14.6 
16.3 
16.2 
Depth „ „ „ „ „ „ „ 
( a 3 a *») ff ff ff ff ff 
99 99 99 
9.4 
9.i 
9.4 
9.4 
9.4 
10.6 
9.o 
10.3 
10.4 
12.2 
9.2 
10.5 
11.9 
Breadth of the forehead at the middle of the eyes „ „ „ „ ,, 
99 9> 99 
28.6 
30.i 
27.6 
31.2 
28.4 
30. o 
28.3 
30.9 
27.9 
29.7 
27.6 
29.3 
30. o 
Length of the maxillaries ( ai ) 
99 99 99 99 99 
99 99 99 
25.2 
27.5 
28.9 
27.7 
28.2 
27.i 
27.6 
29.o 
29.o 
27.8 
28.9 
27.9 
27.8 
„ „ „ lower jaw (kl) 
- ff ff ff ff ff 
99 99 99 
45.2 
44.o 
45.8 
44.6 
44.5 
42.o 
45.8 
44.5 
43.5 
41.3 
44.4 
42.7 
41. s 
,, ., „ suboperculum (op) 
99 99 99 99 99 
99 99 9’ 
30.3 
29.8 
29.7 
29.7 
29.0 
30.2 
30.8 
29.6 
29.6 
29.o 
30.8 
30.i 
28.9 
Vertical diameter of the eves 
.. in % of the length of the head reduced 
30. o 
26.4 
29.9 
26.2 
29.7 
24.i 
28.i 
24.5 
28.3 
24.2 
31.4 
28.4 
24.0 
Depth of the snout at the rostral protuberances „ „ „ „ „ „ „ 
99 99 
12. G 
12.4 
12.4 
12.7 
12.3 
14.0 
12.i 
13.6 
13.8 
16.3 
12.3 
14.1 
15.8 
Length of the maxillaries. 
-* 99 99 99 99 99 99 99 
99 99 
33.8 
37.4 
38.3 
37.3 
36.8 
35.9 
37.o 
38.3 
38.6 
37.3 
38.5 
36.8 
36.9 
Breadth „ „ „ 
in % of their length 
37.9 
37,o 
36.4 
36.5 
37.0 
37.3 
36.9 
36.2 
37.7 
38.0 
30.9 
38.3 
37.7 
Length ,, ., ., 
. in % of the length of the lower jaw 
55.7 
63.o 
63.9 
62.2 
63.7 
64.7 
60.3 
65.2 
66.9 
67.4 
65.i 
64.5 
66,7 
Least depth of the peduncle of the tail ... 
- 99 99 99 99 99 99 99 
99 9 9 
72.9 
84.5 
72.3 
85.i 
78.s 
89.6 
69.3 
85.2 
71.3 
89.3 
64.4 
78.9 
87.7 
Depth of the snout at the rostral protuberances in % of its breadth at the 
same point. 
56.8 
56.3 
55.3 
56.3 
64.i 
66.4 
58.9 
65.i 
64.8 
76,c 
64.o 
65.3 
74.o 
Number of gill-rakers on the first left branchial arch 

35 
36 
35 
36 
29 
32 j 
31 
33 
25 
25 
23 
24 
25 
Not even in the averages do we here find any 
constant difference, except in the number of the gill- 
rakers; and even the form difference which in the 
case of adult specimens is the most trustworthy di- 
stinction between bldsikar and fetsikar, the different 
depth of the snout, proves to be a character of age. 
But in the last-mentioned respect, where the percent- 
ages rise with age, as well as in other characteristic 
features, e. g. the relative length of the lower jaw, 
where the percentages sink with increasing age, we 
