. British and Irish Salmonidae. Salmon. SEA TROUT—DIVISIONS OF. 151 gradations without showing any definite line of demarcation, while it is not infrequent for individuals of the southern race to be found in the northern portions of the British Isles, and vice versd. Among British Ichthyologists up to the period when Ray's posthumous work on fishes was published in 1713, two forms of sea trout were recognized,* the larger and that most esteemed for the table being known as the gray-salmon. Trultaoeum cinereus, and the Bull or scurf trout T. salmonata, which was smaller, rarely exceeding 20 inc
. British and Irish Salmonidae. Salmon. SEA TROUT—DIVISIONS OF. 151 gradations without showing any definite line of demarcation, while it is not infrequent for individuals of the southern race to be found in the northern portions of the British Isles, and vice versd. Among British Ichthyologists up to the period when Ray's posthumous work on fishes was published in 1713, two forms of sea trout were recognized,* the larger and that most esteemed for the table being known as the gray-salmon. Trultaoeum cinereus, and the Bull or scurf trout T. salmonata, which was smaller, rarely exceeding 20 inches in length, possessing rank and odorous flesh, as well as a shorter and thicker head than the first. Whether Linnseus in his description of Salmo trutta intended to describe an estuary or non-migratory form of this fish has been questioned, for as long ago as Johnstonf its variability in colour had been pointed out. But little alteration was made for some years subsequently, except that Pennant introduced as a new species the grille-stage of the northern form of sea-trout, as the white-trout, while Sir Humphry Davy, in 1824, classed all our varieties under one head, Salmo eriox. But shortly afterwards more activity in searching for and naming fresh species set in, commencing with FlemingJ in 1828 and Jenyns in 1835, who recognized a bull trout with a forked tail fin or the scurf, also the northern grilse with a * Sibbald in his Natural Histoi-y of Scotland, 1684, placed among the river fish salmon trout or Trutta salmoneta, and in his list of those from the lakes the great-lake trout suggesting whether the last could not be the buU trout. Willoughby, in 1686, gave a brief description of Salmo grisem, or the gray salmon, which he considered of a better flavour than the salmon or salmon trout: while the scurf, Trutta salmonata, or bull trout, he observed, differed from the gray-salmon in being smaller, rarely exceeding twenty inches in length, having its head shorter and thi
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