. Frank Forester's fish and fishing of the United States and British provinces of North America [microform] : illustrated from nature. Fishing; Fishes; Pêche sportive; Poissons. In figure 2 of this cut, representing the gill-cover of the true Salmon, it will strike any casual observer that the hinder margin of the whole covering forms nearly a semicircle, while that of No. 3, the Bull Trout, approaches more nearly to a rectangular figure. In the. former, the pre-operculum, fore-gill-cover, a, differs from the same part, similarly marked, in No. 3, it being more rectilinear; while the opercnlu
. Frank Forester's fish and fishing of the United States and British provinces of North America [microform] : illustrated from nature. Fishing; Fishes; Pêche sportive; Poissons. In figure 2 of this cut, representing the gill-cover of the true Salmon, it will strike any casual observer that the hinder margin of the whole covering forms nearly a semicircle, while that of No. 3, the Bull Trout, approaches more nearly to a rectangular figure. In the. former, the pre-operculum, fore-gill-cover, a, differs from the same part, similarly marked, in No. 3, it being more rectilinear; while the opercnlum., gill-cover proper, b, of the former slopes hindward and backward; the same portion, b, in No. 3, cutting in a horizontal line upon the joints of the sub-operciUiim and inter'Operculum. And in all respects both differ entirely from the arrangement of the same parts in the head of the Silver Trout, exhibited in the cut last preceding at page 45. ' " ' â¢' The most striking consequence of these differences is, that a straight line, drawn backward from the front teeth of the upper jaw, the mouth being closed, to the longest posterior projection of the gill- cover, will, in the three fish, run at a totally different angle to the horizontal line of the body; and will occupy an entirely different situ- ation in respect to the eye; such a lino in the head of the Salmon, Salvia Salar, and in the Silver Trout, Salmo Lamstris, passing close below the orbit of the eye; while in that of the Bull Trout, Salmo ErioXy it will run obliquely very far below it. 'â " 'â¢' This distinction is very easy of observation, and is extremely im- portant in the definition of species; as indeed is everything connected ' t i r V ji i ,i *. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Herbert, Henry William, 1807-18
Size: 1529px × 1634px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectfishes, booksubjectfishing, bookyear1
