Distribution.—Seas of tropical and sub-tropical regions.
Family 109.—RHINOBATIDÆ. (3 Genera, 15 Species.)
"Rays with long and strong tail, having a caudal and two dorsal fins."
Distribution.—Tropical and sub-tropical seas.
Family 110.—TORPEDINIDÆ. (6 Genera, 15 Species.)
"Rays with broad smooth disc, and an electric organ."
Distribution.—Tropical and temperate seas, from Britain to Tasmania.
Family 111.—RAIIDÆ. (4 Genera, 29 Species.)
"Rays with broad rhombic disc and no serrated caudal spine."
Distribution.—All temperate and tropical seas. Several species of Raia are found on our coasts.