. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. 246 ECONOMIC ZOOLOGY AND ENTOMOLOGY surface waters and feed on any other animals that they can capture. The shark's mouth is on the underside of the head, so it must turn over on its back in order to sieze any prey that is swimming above it. The great basking sharks, genus Cetorhinus, which reach a length of nearly forty feet, often gather in numbers and float motionless on the surface of the sea. The great white shark, Carcharodon carcharias, occurs. FIG. 114.—The common skate, Raja erinacca. (From Kingsley.) in
. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. 246 ECONOMIC ZOOLOGY AND ENTOMOLOGY surface waters and feed on any other animals that they can capture. The shark's mouth is on the underside of the head, so it must turn over on its back in order to sieze any prey that is swimming above it. The great basking sharks, genus Cetorhinus, which reach a length of nearly forty feet, often gather in numbers and float motionless on the surface of the sea. The great white shark, Carcharodon carcharias, occurs. FIG. 114.—The common skate, Raja erinacca. (From Kingsley.) in all warm seas, and because it does not hesitate to attack man it is often known as the man-eating shark. It attains a length of thirty feet or more. The smooth dogfish shark, Mustelus, the horned dogfish shark, Squalus, and the sand- shark, Carcharias, often occur in great numbers in shallow waters and do much damage by destroying lobsters and many valuable food fishes. They are a great nuisance on the. 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937; Doane, Rennie Wilbur, 1871-. New York, H. Holt and company
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