808 
R. br. 3; I). 
8° — 9 
A. 3 : P. 1 
14 — 1 6 ' 16—17 
SCANDINAVIAN FISHES. 
v. 2 
8—9’ 
9 io 
C . #+l + li + 14- sc L. lat. 42 — 4b ; B. tv. 1. 
4 — 5 
Syn. Bliccopsis Buggenliagii, p. p. Heckel, 1. c. (uee Bloch); 
Qvennerstedt ( Cyprinus ), Of vers. Vet.-Akad. Forh. 1877, 
No. 7, p. 13, tab. VII et VIII; Malm ( Abramidopsis ), Gbgs 
Naturh. Mus. Arsskrift, III (1881), p. 25. 
Abramis abramo-rutilus, p. p., Holandre, Fne Mos., vide Sieb. 
( Bliccopsis ), Susswasserf. Mitteleur., p. 142. 
Bliccopsis evythrophthalmoid.es, Jackel, Fiscli. Bay., Abb. Zool. 
Miner. Ver. Regensburg, H. 9 (1864), II, p. 49. Hybrid 
between Leuciscus erythrophthalmus and Abramis blicca, 
Gthr, Cat. Brit. Alas., Fislt., vol. VII, p. 233. 
The hybrid assumed on the above grounds to exist 
between the White Bream and the Rudd attains in 
Sweden a length of at least 27 cm., including the whole 
caudal tin. It has the convex dorsal margin of the 
Rudd — though the dorsal profile, as in the White 
Bream, forms a sharper break at the occiput — the 
broad forehead of the Rudd — the breadth of the inter- 
orbital space sometimes about 45 % of the length of 
the head — and the comparatively low dorsal fin of the 
same species — the length of the longest ray less than 
V 5 of that of the body. But the length of the anal 
fin, which at least exceeds 16 % of that of the body, 
at once shows, apart from the number of the rays, that 
the fish cannot be referred to this species. The pha- 
ryngeal bones and teeth are also most like those of the 
Rudd; but the only essential difference in this respect 
between the Rudd and the White Bream lies in the 
more elongated form of the teeth, with longer and more 
lateral masticatory surface, and their more distinct 
pectination in the former. In the only specimen of 
this hybrid whose pharyngeal apparatus we have been 
able to examine, the teeth numbered 3, 5 — 5, 3. 
In Sweden, as far as we know, this hybrid has 
been found only at two localities in Scania and one in 
Blekinge. It was first taken in 1864 by Prof. Berg- 
gren in Lake Ring; but Prof. Qvennerstedt was the 
first (1876) to notice and determine this find, describing 
at the same time two other specimens from the same 
locality, one procured through Berggren, the other 
taken by Prof. Naumann, who has also presented a 
specimen to the Museum of Gothenburg. In the mean- 
time (1869) a specimen denoted by Qvennerstedt (1. c., 
p. 21) as ‘Ex. 1’, had been caught in the River Helge, 
and stuffed by Mr. Svensson for the Museum of Kristian- 
stad. The original of our figure was taken at the be- 
ginning of May, 1876, by Mr. Lundberg, Inspector of 
Fisheries, among a haul of Herrings caught in a seine 
off Lagervik at Karlskrona. According to Qvennerstedt 
two more specimens have been found in Lake Ring, but 
not preserved, so that in all 8 examples have hitherto 
been met with in Sweden, most of them in fresh water, 
but one in the brackish water of the Baltic island-belt. 
a Sometimes 7, according to Fatio. 
6 Sometimes 12 — 15, according to Fatio. 
