HYBHII) TIIRBOT AND BHII.L. 



445 



Tliis form is described at length hy Malm ((tlx/s, 

 Ihili. Fn., p. ")ll). He possessed two specimens, l)otli 

 females and hotli taken off tlie Skaw, tlie one, 56 cm. 

 long, in April, 1871, and the other, H2 cm. long, in 

 Nov(>mber, 1<S80. A tliird specin)en, a male 38 cm. 

 long, was cangiit by Mr. ('. A. Uanssson in Str5rastad 

 Fjord, on the 21st of May, 1887, and forwarded by 

 him to the Royal Mnsenm. 



Relatively to tlie 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 lenii'th of the maxillary bones less than 12 %, 

 the length of the right brancli of the lower jaw less than 

 15 %, the distance between tlie anal fin and the tip of 

 the snout less than 30 %, the base of the left ventral 

 tin more than 10 %;, that of the i-ight ventral fin more 

 than 8 %, and tlu' greatest thickness of the body less 

 than 8 %. First ray of the dorsal fin deeply and 

 repeatedh- liranched. Xumbei- of i-ays 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 Iom' and blunt protuberance behind, and 



with a groove I'unning 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 % ff ^'k' 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 ()0 %, of the length of the body. Each of 

 the rays of the vertical fins furnished with a double 

 row of si'ales, the posterior row containing almost typical 

 cycloid scales, like those of the Brill, excepting that 

 the nucleus in the <juter (posterior) part of the scale 

 is slightly raised into a buckle. 



The fin-formula in the specimens on record is: 

 B. 63—65; A. 47—48; P. 12"; V. 6'; C. 2'+ 13'' + 2". 



The lateral line of the eye side contains 34' — 36 

 scales in the arch and 51^ — 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 tlie 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, Avas of an almost plain 

 blackish brown. The blind side is white. 



THE TURBOT-LIKE BRILL — BOTHUS RHOMBUS HYBRIDUS. 



Fiir. lU. 



Mr. Haxsson 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: 

 D. 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 ]iores liack to the base of the 

 caudal fin on the eye side, and 118 on the blind side, 

 of these 44 in the arch on tlie former side and -18 on 

 the latter. 



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 rlepth 

 of the body (tail) is somewhat more than '/, (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 liase of the ventral fin of the ej'e side mea- 

 sures less than ' ^ of the length of the body; the 

 scales are still more nearly of the typical cycloid form. 



" According to Malm 10. 



' Thtse rays (the two outermost at the upper and lower margins of tlie caudal fin) do not extend to the hind margin of the fin, 

 and the inner one on each i^ide is branched (bifid). This is also true of the following form. 

 "' According to Malm 1-1. 

 ' Accor<ling to Malm. 



