Chapter I: THE NORTHERN ZONE OR HOLARCTIC REGION.--Characterized
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by Acipenseridae. Few Siluridae. Numerous Cyprinidae, Salmonidae,
Esocidae, Percidae.
1. Europaeo-Asiatic or Palaearctic Region. Characterized by
absence of osseous Ganoidei; Cobitinae and Barbus numerous.
2. North American or Nearctic Region. Characterized by osseous
Ganoidei and abundance of Catostominae; but no Cobitinae or
Barbus.
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Encyclopaedia Britannica, 11th Edition, "Ichthyology" to "Independence"Chapter I: THE NORTHERN ZONE OR HOLARCTIC REGION.--Characterized
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