. Zoology : for students and general readers . Zoology. THE PLESIOSAURS. 513 Another form was still more like the turtles, the jaws being toothless and enclosed in a nipping, horny beak. In Lya- trosaurus (Fig. 450) the head was blunt, the jaws armed in front with stout teeth, and behind with canine teeth ; and these animals, anticipating in their dentition the lions and tigers, were called by Owen Theriodonts (beast-toothed). These forms lived during the Permian and Triassic times. Order 8. Sauropterygia.—The Plesiosaurus is the type. Fig. 450.—Skull of Lystrosaurns f7ontosv-^tTOTiiC&.^^C
. Zoology : for students and general readers . Zoology. THE PLESIOSAURS. 513 Another form was still more like the turtles, the jaws being toothless and enclosed in a nipping, horny beak. In Lya- trosaurus (Fig. 450) the head was blunt, the jaws armed in front with stout teeth, and behind with canine teeth ; and these animals, anticipating in their dentition the lions and tigers, were called by Owen Theriodonts (beast-toothed). These forms lived during the Permian and Triassic times. Order 8. Sauropterygia.—The Plesiosaurus is the type. Fig. 450.—Skull of Lystrosaurns f7ontosv-^tTOTiiC&.^^Co\(i\\Y. Profile. Lettering as in Fig. 443 and 444, with the following additionw ; EU)om, etbmovonicrine ; Sph, sphenoid; jrro, Prootic; Pt^r, Pterygoid; Col, Columella; Ectp, Ectopterygoid ; Suitart, subarticular bone.—From Cope. of this extinct order. The Plesiosaurs were somewhat like the Ichthyosanrs, swimming by paddle-like feet, but the neck wiis very long, and the head rather small. The largest true Plesiosanr was about nine metres in length. They abounded during the Jurassic and Cretaceous period. During the lat- ter period off the coast of New Jersey and in the seas of Kansas flourished huge Plesiosaurian reptiles, such as Mas- mosaurus, which had an enormous comi^ressed tail. 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
