"Marine Plectognathi, with toothed jaws."
Distribution.—Temperate and Tropical seas, but much more abundant in the Tropics.
Family 91.—GYMNODONTES. (10 Genera, 82 Species.)
"Marine or fresh-water Plectognathi, with jaws modified into a beak."
Distribution.—Temperate and tropical regions.
Some species of Tetrodon are found in the rivers of Tropical America, Africa, and Asia. Species of Tetrodon and Orthagoriscus have been found on the British coasts.
Sub-class II.—DIPNOI.
Family 92.—Sirenoidei. (3 Genera, 3 Species.)
"Eel-shaped fresh-water fishes, covered with cycloid scales; the vertical fins forming a continuous border to the compressed tapering tail."
Distribution.—Rivers of Tropical Africa, South America, and Australia.