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460 GEOGRAPHICAL ZOOLOGY. [part iv.<br />

Subclass IV.—CHONDROPTERYGIL (Sharks<br />

AND Rays.)<br />

Order I.—HOLOGEPHALA. (Chimceras.)<br />

Family 98.—CHIM^RID^. (2 Genera, 4 Species.)<br />

" Shark-like marine fishes, snout of the male with a prehensile<br />

organ."<br />

Distribution.—Northern and Southern temperate seas. Chi-<br />

mccra is British.<br />

Order II.—PLAOIOSTOMATA.<br />

Sub-order.<br />

—<br />

Selachoidea. (Sharks.)<br />

Family 99.—CARCHARIID^. (11 Genera, 59 Species.)<br />

" Sharks with two dorsals and a nictitating membrane."<br />

Distribution.—Seas of the Arctic, temperate, and tropical<br />

regions. Species of Galeus and Mustelm have occurred on our<br />

coasts.<br />

Family 100.—LAMNID^. (5 Genera, 7 Species.)<br />

" Sharks with two dorsals and no nictitating membrane."<br />

Distribution.— Temperate and tropical seas. Species of<br />

Lamna, Alopecias, and Selache have occurred in British seas.

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