. Animal biology. Zoology; Biology. Fig. 249.—African lungfish, Protopterus annectens Owen. X M- {From Packard, "Zoology," after Boas, by the courtesy of Henry Holt & Company.) the water with the least amount of retardation from resistance in front, friction laterally, or suction behind. The fins, being thin in the plane of movement, offer little C D Fig. 250.—Scales of fishes. A, cycloid scale of northern pike, Esox Indus Linnaeus. X 8. B, ctenoid scale of common perch, Perca flavescens (Mitchill). X 9. C, placoid scales of dogfish shark, Squalus acanthias Linnaeu
. Animal biology. Zoology; Biology. Fig. 249.—African lungfish, Protopterus annectens Owen. X M- {From Packard, "Zoology," after Boas, by the courtesy of Henry Holt & Company.) the water with the least amount of retardation from resistance in front, friction laterally, or suction behind. The fins, being thin in the plane of movement, offer little C D Fig. 250.—Scales of fishes. A, cycloid scale of northern pike, Esox Indus Linnaeus. X 8. B, ctenoid scale of common perch, Perca flavescens (Mitchill). X 9. C, placoid scales of dogfish shark, Squalus acanthias Linnaeus: a, surface view of a number; b, view of dorsal surface of one; c, side view of one, isolated, the surface level being indicated by a line; d, side view of one in position, a, X 30; b, c, and d, X 60. D, ganoid scales of Lepisoateus osseus (Linnaeus). X 2. Those fish which are built for speed or live in swift currents approxi- mate the typical spindle shape; those which live in quiet waters tend to become flattened from side to side; and those which are adapted for life close to the bottom become flattened dorsoventrally. A slender,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wolcott, Robert Henry, 1868-1934; University of Nebraska (Lincoln campus). Dept. of Zoology. New York ; London : McGraw-Hill Book Company, Inc.
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