FISHES. 
31,3 
Gymnotus electricus. —The Electrical Gymnotus. 
Plate LXXIX. fig. 12. 
Body elongated ; dusky above, and paler below; head and 
tail obtuse. Six feet long. Inhabits the rivers of South 
America. 
Genus 10.—CARPUS. — Cuvier. 
Generic Character .—Body compressed; back and abdomen 
produced, tapering suddenly to the tail; covered with large scales. 
Genus 11. — STERNA RCHUS. — Schneider. 
Generic Character .—Head oblong, depressed, destitute of 
scales; body scaly; middle of the back provided with a soft 
fleshy filament situated in a furrow; anal fin terminating near 
the tail. 
Genus 12.—LE P T O CE P HA L U S.— Pennant. 
Generic Character. —Head small; branchial aperture small 
and transverse ; body compressed like a riband ; dorsal, caudal, 
and anal fins united. 
Leptocephalus Morrisii. — Morris's Leptocephalus. 
Plate LXXX. fig. 1. 
Pale-grayish yellow, semipellucid; margins of back and belly 
with small black spots. Six inches long. Inhabits the coasts 
of England. 
Genus 13—OPHIDIUM.— Linnaeus. 
Generic Character. —Branchial operculum large; rays of the 
membrane short; and two small bifid cirri under the throat; 
body elongated, compressed, with small irregular scales ; dorsal, 
anal, and caudal fins united; tail acute. 
Genus 14.—FIE R A SEER.— Guvier. 
Generic Character. — Head short, depressed; without cirri; 
body oblong, slender; dorsal fin extremely indistinct, resembling 
a fold of skin. 
Genus 15.—AMMOD Y TE S. — Linnaeus. 
Generic Character. —Snout acute; upper jaw capable of ex- 
