Family 97.—POLYDONTIDÆ. (1 Genus, 2 Species.)
"Fresh-water fishes, with wide lateral mouth and naked skin."
Distribution.—The Mississippi and Yang-tse-kiang rivers.
Sub class IV.—CHONDROPTERYGII. (Sharks and Rays.)
Order I.—HOLOCEPHALA. (Chimæras.)
Family 98.—CHIMÆRIDÆ. (2 Genera, 4 Species.)
"Shark-like marine fishes, snout of the male with a prehensile organ."
Distribution.—Northern and Southern temperate seas. Chimæra is British.
Order II.—PLAGIOSTOMATA.
Sub-order.—Selachoidea. (Sharks.)