. Catalogue of the fishes in the British Museum. British Museum (Natural History); Fishes. 1. SALMO. 35 B. 10-11. D. 14. L. fcransv. ^. A. 11-12. P. 16. V. 9. L. lat. 120-125. Yert. 59. Case, pylor. 39-47, rarely Attaining to a length of about 3 feet; female mature at a length of from 12 to 13 inches. Head rather long, compared with its depth; operculum rather short, its length being contained in its depth once and foui'-iifths in large (32-in.) specimens, once and three-fifths in adult ones (22-in.), once and two-fifths in specimens in the Grilse-state, and once and one-fifth in specim
. Catalogue of the fishes in the British Museum. British Museum (Natural History); Fishes. 1. SALMO. 35 B. 10-11. D. 14. L. fcransv. ^. A. 11-12. P. 16. V. 9. L. lat. 120-125. Yert. 59. Case, pylor. 39-47, rarely Attaining to a length of about 3 feet; female mature at a length of from 12 to 13 inches. Head rather long, compared with its depth; operculum rather short, its length being contained in its depth once and foui'-iifths in large (32-in.) specimens, once and three-fifths in adult ones (22-in.), once and two-fifths in specimens in the Grilse-state, and once and one-fifth in specimens in the Parr-state; like the other bones of the skull, it is well ossified, and striae radiating from the base towards the hinder edge are much more conspicuous than concentric mar- ginal striae. The hind margin of the gill-cover is more or less pro- duced, the suboperculum projecting beyond the end of the opercle. The posterior point of junction of operculum and suboperculum is much nearer to the lower end of the suboperculum than to the upper end of the gill-opening; and only in very young examples are the dis- tances between these points equal, Prasoperculum with a distinct lower limb, with the angle rounded, and with the hind margin convex or undulated, subvertical. Snout rather long, much produced in males, in which the lower jaw be- comes hooked during the spawning-season. Maxillary strong, solid, longer than the snout; in specimens of the Grilse-state (about 12 in. long) it already extends to the vertical from the hind margin of the orbit, or even beyond it; and in larger ones, females as weU as males, it constantly exceeds that line; in examples 6 inches long it reaches beyond the middle of the orbit. Head of the vomer tri- angular, broader than long, toothless in adult examples, and armed with a few teeth across its hinder margin in young ones; body of the bone with a sharp longitudinal ridge, in the sides of which the teeth are inserted, forming a single series, an
Size: 1533px × 1631px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishmuseumnatur, bookcentury1900, booksubjectfishes
