Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 FISHES. 323 to a great extent, since no other forms give such a clear understanding of the characters of the group. Of the several orders, only the Squall, Raise, and Holocephali need mention here. ORDER I.—SQUALI (Sharks). In the sharks the body is more or less cylindrical, and the gill-slits open upon the sides of the neck. About 150 FIG. 122. — Sawfish (Pristis pectinatus). After Goode. FIG. 123.—Common Skate (Raia erinacea). species are known, some, like the dogfish, being small,

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Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 FISHES. 323 to a great extent, since no other forms give such a clear understanding of the characters of the group. Of the several orders, only the Squall, Raise, and Holocephali need mention here. ORDER I.—SQUALI (Sharks). In the sharks the body is more or less cylindrical, and the gill-slits open upon the sides of the neck. About 150 FIG. 122. — Sawfish (Pristis pectinatus). After Goode. FIG. 123.—Common Skate (Raia erinacea). species are known, some, like the dogfish, being small, others reaching an enormous size. Those species which

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