. Zoology for high schools and colleges. Zoology. 513 ZOOLOOT. The Ichthyosaurs were colossal reptiles from two to thirteen metres (six to fortj feet) in length, swimming in the ocean by four paddle-like limbs consisting of six rows of digital bones. Fig. 448.—Skull of Ichthyosaurus ; lateral view. Prnx, premaxlllary bone ; Mx, maxillary ; N, nasal; Fr, frontal; Prf, prefrontal; Pof, postfrontal; Pa, parietal i, lachrymal; M, malar ; Qj, quadratojugal ; Q, quadrate ; Pob, postorbital; Sg, squamosal; D, dentary; Ang, angular ; AH, articular ; 8. Ar, subarticular ; Pter pterygoid.—After Cope. th
. Zoology for high schools and colleges. Zoology. 513 ZOOLOOT. The Ichthyosaurs were colossal reptiles from two to thirteen metres (six to fortj feet) in length, swimming in the ocean by four paddle-like limbs consisting of six rows of digital bones. Fig. 448.—Skull of Ichthyosaurus ; lateral view. Prnx, premaxlllary bone ; Mx, maxillary ; N, nasal; Fr, frontal; Prf, prefrontal; Pof, postfrontal; Pa, parietal i, lachrymal; M, malar ; Qj, quadratojugal ; Q, quadrate ; Pob, postorbital; Sg, squamosal; D, dentary; Ang, angular ; AH, articular ; 8. Ar, subarticular ; Pter pterygoid.—After Cope. the head was very large, the neck very short, and the orbits were enormous ; the vertebrse were remarkably short and bi- ^ concave. They were carniv- orous, and powerful swim- mers, and common in tho Ju- rassic seas of Europe; one form existed in the Jurassic times in Wyoming. Order 7. Theroniorpha.— This order is divided into the Pelycosauria and Anomo- dontia. Tho beaked Saurians were somewhat lizard-like, but Fig. 449.—Posterior view of the skull of were Synthetic tvpes, combin- Ichthyonaurus; lettering as in Fig. 443, . .'' •' ^ witti following additions ; Bo, basiocci- ing the characters 01 the ich- pital ; Exo, Bxoccipital; Sup. O, supra- ,-, ., . ^, ,, occipital; Opo, opisthotic; stap, supra- tnyosaurs, the turtles, the stapedial or hyomandibular.—After Cope. 07 7 -ii j_i £ t iSphenodoti, with those of liz- ards, Dinosaurians, and crocodiles. The skull was short, and in Dicynodon the jaws in front had the nipping, horny beak of a turtle, while from behind in the upper jaw pro- truded two long, curved, canine teeth. Dicynodon Hgriceps Owen, had a skull about half a metre (20 inches) 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, H
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