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L
CHAP. XX.] FISHES. 463
Family 112.—TRYGONID^. (6 Genera, 43 Species.)
" Eays 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 Tmniura 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.—MYLOBATID^. (5 Genera, 22 Species.)
" Eays 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 Ceratojptera are very
large Kays, commonly called Sea-devils.
Sub-class V.—CYCLOSTOMATA.
" Cartilaginous fishes, with suctorial mouths and without
lateral fins."
Family 114.—PETROMYZONTIDiE. (4 Genera, 12 Species.)
" Marine or fresh-water eel-like fishes, with suctorial mouths
and without barbels."
Distribution.—Coasts and fresh waters of temperate regions
of both hemispheres. Three species of Petromyzon (Lampreys),
are British.