Family 112.—TRYGONIDÆ (6 Genera, 43 Species.)
"Rays with the pectoral fins extending to end of snout."
Distribution.—Seas of all temperate and tropical regions, and rivers of Tropical America. A species of Trygon has occurred on our Southern coast. Ellipesurus and Tæniura are found in the fresh waters of the interior of South America, while the latter genus occurs also in the Indian seas, but not in the Atlantic.
Family 113.—MYLOBATIDÆ. (5 Genera, 22 Species.)
"Rays with very broad pectoral fins not extending to end of snout."
Distribution.—Temperate and tropical seas. A species of Myliobatis is British, but most of the species and genera are confined to tropical seas. Dicerobatis and Ceratoptera are very large Rays, commonly called Sea-devils.
Sub-class V.—CYCLOSTOMATA.
"Cartilaginous fishes, with suctorial mouths and without lateral fins."
Family 114.—PETROMYZONTIDÆ. (4 Genera, 12 Species.)
"Marine or fresh-water eel-like fishes, with suctorial mouths and without barbels."