. British and Irish Salmonidæ. inted form that I have seen, being finelystudded with black and red dots placed in a light circle, and likewise with numerous blue marks orspots with bluish borders. Its dorsal fin is finely spotted, but the white anterior edge so constant 13 * 196 SALMONID^ OF BRITAIN. Brook Trout.* Plates V, VI, VII, VIII, and X.(For synonymy see page 190 ante.) B. x-xii, D. 12-15 (-/xV)> P- 13-15, V. 9, A. 10-12 ij%), C. 19, LI. 110-130,Vert. 5G-60. Length of lieadf 4| to 5y\-) in o\d males lias been seen as long as 3h, andas a rule it is always longer in males than it is i
. British and Irish Salmonidæ. inted form that I have seen, being finelystudded with black and red dots placed in a light circle, and likewise with numerous blue marks orspots with bluish borders. Its dorsal fin is finely spotted, but the white anterior edge so constant 13 * 196 SALMONID^ OF BRITAIN. Brook Trout.* Plates V, VI, VII, VIII, and X.(For synonymy see page 190 ante.) B. x-xii, D. 12-15 (-/xV)> P- 13-15, V. 9, A. 10-12 ij%), C. 19, LI. 110-130,Vert. 5G-60. Length of lieadf 4| to 5y\-) in o\d males lias been seen as long as 3h, andas a rule it is always longer in males than it is in females, of caudal fin 7 to 70,height of iDody 4 to 5 in the total length. Head much more pointed in than in others. Much stress, but very unnecessarily so, has been laidupon the form and size of the pieces of the gill-covers. I have, therefore, figuredtljose of two examples from the Windrush, in Gloucestershire, captured on June11th, 1886, and in which the character of these bones was similar on both sides of. No. 1. No. 2. Fig. 43. Gill-covers of brook trout from Windrush, naturalsize. No. 1, 58 vertebrje and 45 ca:ca : No. 2, 57 vertebra; and49 the head (which is not always the case). In the first (fig. , no. I), the posteriortermination of the snb-opercle is obliquely rounded off, but in no. 2 this is muchless the Species have even been ])artially defined by a short lower limb tothe preopercle, but it will be seen (see fig. 44, nos. 1 and 2), that this bone becomescomparatively wider in old examples, and thus the length of this limb becomesmore or less obliterated. All gradations between these two forms may be foundin fresh-water fishes, consequent upon local peculiarities or age. The com-jiarative size of the opercle, subopercle, and interopercle, to that of the head,changes very little with age, quite contrary to what is seen in the preopercle. Itis necessary to draw attention to the specimens in figure 43, being from trout take
Size: 2403px × 1040px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookidbritishirish, bookyear1887
