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458 GEOGRAPHICAL ZOOLOGY. [part iv.
Family 92.
—
Sub-class II.—DIPNOI.
Sirenoidei. (3 Genera, 3 Species.)
" Eel-shaped fresh-water fishes, covered with cycloid scales
the vertical fins forming a continuous border to the compressed
tapering tail."
Distribution.—Kivers of Tropical Africa, South America, and
Australia.
The genera are :
Protopterus (1 sp.), Tropical Africa ; Lepido-
siren (1 sp.), Amazon Valley ; Ceratodus (1 sp.), Queensland.
fin."
Sub-class III.—GANOIDEI.
" Body covered with scales."
Order I.—HOLOSTEL
Family 93.—AMIID^. (1 Genus, 1 Species.)
" A fresh-water fish, with cycloid scales and a long soft dorsal
Distribution.—United States.
Family 94.—POLYPTEEID^. (2 Genera, 2 Species.)
" Fresh-water fishes, with ganoid scales and dorsal spines."
Distribution.—Central and Western Africa.
The genera are :
Polypterus (1 sp.), the Nile and rivers of West Africa; Gcila-
moichthys (1 sp.). Old Calabar,
;