File:Image from page 259 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14804908093).jpg

Identifier: introductiontozo00dave Title: Introduction to zoology; a guide to the study of animals, for the use of secondary schools; Year: 1900 (1900s) Authors: Davenport, Charles Benedict, 1866-1944 Davenport, Gertrude Anna Crotty, 1866- Subjects: Zoology Publisher: New York, Macmillan company London, Macmillian and co., ltd. Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library

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Text Appearing Before Image: . 221. — Gad its morrhua, the codfish. About one-seventh nat. size. After Storer. occurs over the whole of the North Atlantic ; but themost important fishing localities are the banks near New-foundland, especially Grand Bank. The flatfishes are peculiar among fishes in that theyhave the habit in the adult stage of lying on one side. Inconsequence the under eye migrates to the upper side, sothat both eyes come to lie on the same side of the body.The mouth also tends to become unsymmetrical. Theflatfish, consequently, illustrates well the principles of self-adaptation to a peculiar environment. The catfishes are distinguished by the possession offour to eight long barbels around the mouth, and by the 240 ZOOLOGY absence of scales on the body. They are characteristic ofSouth America, but there are a large number of species inthe United States, mostly found in the Mississippi valley

Text Appearing After Image: • ->>.•. X * .§ . * ;« -* V X x\X X VV , v\V NV FIG. 222. — One of the flatfishes, seen from the upper side. Two-thirds nat. sixe. Photo, by W. H. C. P. and the Great Lakes, inhabiting deep or sluggish waters,and living in the mud. The common New England

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