Family 83.—HALOSAURIDÆ. (1 Genus, 1 Species.)
"Marine fishes, with cycloid scales, a short median dorsal fin, and no barbels."
Distribution.—Deep waters of the Atlantic, Madeira.
Family 84.—GYMNOTIDÆ. (5 Genera, 20 Species.)
"Fresh-water fishes, with elongate bodies, pointed tail, and no dorsal fin."
Distribution.—Tropical America from Trinidad to the River Parana.
The genera are distributed as follows:—
Sternarchus (8 sp.), Guiana and Brazil; Rhamphichthys (6 sp.), Guiana and Brazil; Sternophygus (4 sp.), Tropical America; Carapus (1 sp.), Trinidad to Brazil; Gymnotus, (1 sp.—the Electric eel), Tropical South America.
Family 85.—SYMBRANCHIDÆ. (4 Genera, 6 Species.)
"Marine and fresh-water fishes, having elongate bodies without fins, and very minute scales or none."