. The chordates. Chordata. :>: Comparative Morphology of Chordates. Fig. 394. Diagrams showing types of temporal openings in reptiles. (A) Anapsid. (B) Synapsid. (C) Parapsid. (D) Diapsid. (j) Jugal; (p) parietal; (po) postorbital; (sq) squamosal. (Courtesy, Romer: "The Vertebrate Body," Philadelphia, \\ . B. Saunders Co.) During the Cretaceous Period the reptiles went into a decline so rapid—that is, in terms of geologic time—as to be fairly called cata- clysmic. By the end of the period, the reptilian masters of the Mesozoic world had become entirely extinct. Nothing survived of
. The chordates. Chordata. :>: Comparative Morphology of Chordates. Fig. 394. Diagrams showing types of temporal openings in reptiles. (A) Anapsid. (B) Synapsid. (C) Parapsid. (D) Diapsid. (j) Jugal; (p) parietal; (po) postorbital; (sq) squamosal. (Courtesy, Romer: "The Vertebrate Body," Philadelphia, \\ . B. Saunders Co.) During the Cretaceous Period the reptiles went into a decline so rapid—that is, in terms of geologic time—as to be fairly called cata- clysmic. By the end of the period, the reptilian masters of the Mesozoic world had become entirely extinct. Nothing survived of the Class but the five Orders which have come down to the present. The causes of reptilian decline are obscure. Probably changes in configuration of lands and waters were accompanied by climatic changes which upset the biologic balance of vegetation and animal life. Reptiles of today are not only a small remnant of a once mighty group, but a dwindling remnant, for many of them seem fated for early extinction. Their greatest enemy is the human mammal with his liking for terrapin, turtle soup, and alligator leather, and his unreasonable antipathy toward harmless snakes and 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 Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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