HYBRID TURBOT AND BRILL. 
445 
This form is described at length by Malm ( Gbgs, 
Boh. Fn., p. 511). He possessed two specimens, both 
females and both taken off the Skaw, the one, 56 cm. 
long, in April, 1871, and the other, 62 cm. long, in 
November, 1880. A third specimen, a male 38 cm. 
long, was caught by Mr. C. A. Hansson in Stromstad 
Fjord, on the 21st of May, 1887, and forwarded by 
him to the Royal Museum. 
Relatively to the length of the body the greatest 
depth is more than 50 %, the total length of the head 
less than 27 %, the postorbital length of the head less than 
17 %, the length of the maxillary bones less than 12 %, 
the length of the right branch of the lower jaw less than 
15 %, the distance between the anal fin and the tip of 
the snout less than 30 %, the base of the left ventral 
fin more than 10 %, that of the right ventral fin more 
than 8 %, and the greatest thickness of the body less 
than 8 %. First ray of the dorsal fin deeply and 
repeatedly branched. Number of rays in the dorsal 
fin less than 70, in the anal fin less than 50. Least 
depth of the tail less than 20 %, median length of the 
caudal fin less than 36 % of the greatest depth of the 
body. Body furnished with fairly dense, thickened, 
oval, tubercular scales, more or less covered by skin, 
each with a low and blunt protuberance behind, and 
with a groove running forward from this protuberance. 
Curved (abdominal) part of the lateral line high and 
short, the height of the curve being about half its 
length, which measures about 3 / 4 of the length of the 
middle rays of the caudal fin. Length of the base of 
the dorsal fin, measured in a straight line, more than 
75 %, of the anal fin, measured in the same manner, 
more than 60 of the length of the body. Each of 
the rays of the vertical fins furnished with a double 
row of scales, the posterior row containing almost typical 
cycloid scales, like those of the Brill, excepting that 
the nucleus in the outer (posterior) part of the scale 
is slightly raised into a buckle. 
The fin-formula in the specimens on record is: 
I). 63—65; A. 47—48; P. 12°; V. 6 b ; C. 2 c +lS d +2 c . 
The lateral line of the eye side contains 34 e — 36 
scales in the arch and 5 1 f — 60 in the straight part, 
or 85 — 96 scales in all. On the blind side we have 
found 37 scales in the arch and 71 in the straight 
part of the lateral line. 
Malm’s specimens were brownish, with a slight 
dash of olive-gray, on the eye side; Hansson’s specimen, 
when it reached the Museum, was of an almost plain 
blackish brown. The blind side is white. 
THE TURBOT-LIKE BRILL — BOTHUS RHOMBUS HYBRIDUS. 
Fig. 
Mr. Hansson has forwarded to the Royal Museum 
a male specimen of this form, 33 cm. long, that was 
taken in Stromstad Fjord on the 10th of May, 1889. 
In this specimen the fin-formula is: 
I). 68; A. 52; P. 12; V. 6; C. 2+13 + 2. 
The scales of the lateral line are so indistinct that 
they can scarcely be counted with certainty. I believe 
there were 106 opening pores back to the base of the 
caudal fin on the eye side, and 118 on the blind side, 
of these 44 in the arch on the former side and 48 on 
the latter. 
114. 
As in the preceding form the body resembles that 
of the Turbot in one respect: the greatest depth of the 
body is more than half the length. But the least depth 
of the body (tail) is somewhat more than V 5 (nearly 
22 %) of the greatest depth, a character which gives 
this form a .resemblance to the Brill. Furthermore, 
the first rays in the dorsal fin branch still more like 
those of the Brill; the anal fin contains more than 50 
rays; the base of the ventral fin of the eye side mea- 
sures less than 1 / 1 0 of the length of the body; the 
scales are still more nearly of the typical cycloid form, 
a According to Malm 10. 
b 7 
ii ii ii 1 • 
c These rays (the two outermost at tire upper and lower margins of the caudal fin) do not extend to the Innd margin of the fin, 
and the inner one on each side is branched (bifid). This is also true of the following form. 
d According to Malm 14. 
e According to Malm. 
