Family 65.—SALMONIDÆ (15 Genera, 157 Species.)
"Fresh-water fishes, many species periodically descending to the sea and a few altogether marine:—Salmon and Trout."
Distribution.—The Palæarctic and Nearctic Regions, and one genus and species in New Zealand. A considerable number of species are confined to single lakes or rivers, others have a wide distribution.
The genera are distributed as follows:—
Salmo (83 sp.), rivers and lakes of the Palæarctic and Nearctic Regions, as far south as Algeria, Asia Minor, the Hindoo-Koosh and Kamschatka, and to about 38° North Latitude in North America, many of the species migratory; Onchorhynchus (8 sp.), American and Asiatic rivers entering the Pacific, as far south as San Francisco and the Amur; Brachymystax (1 sp.), Siberian rivers, from Lake Baikal and the Atlai Mountains northwards; Luciotrutta (2 sp.), Caspian Sea and Volga; Plecoglossus (1 sp.), Japan and Formosa; Osmerus (3 sp.), rivers of temperate Europe and North America entering the Atlantic, and one species in California; Thaleichthys (1 sp.), Columbia River, Vancouver's Island; Hypomesus (1 sp.), coasts of California, Vancouver's Island, and North-eastern Asia; Mallotus (1 sp.), coasts of Arctic America from Greenland to Kamschatka; Retropinna (1 sp.), fresh waters of New Zealand; Coregonus (41 sp.), fresh waters of northern parts of temperate Europe, Asia and North America, many of the species migratory: Thymallus (6 sp.), fresh waters of temperate parts of Europe, Asia, and North America; Argentina (4 sp.), Mediterranean and deep seas of Western Europe; Microstoma (2 sp.), Mediterranean, and seas of Greenland; Salarix (2 sp.), China and Japan, in seas and rivers. Salmo, Osmerus, Coregonus, and Thymallus, are British genera.
Family 66.—PERCOPSIDÆ. (1 Genus, 1 Species.)
"A fresh-water fish covered with toothed scales."
Distribution.—Lake Superior, North America.
Family 67.—GALAXIDÆ. (1 Genus, 12 Species.)
"Fresh-water fishes, with neither scales nor barbels."