File:Pteranodon skull by Marsh.jpg

English: Identifier: geologicalmagazi3118wood

Title: Geological magazine Year: 1884 (1880s) Authors: Woodward, Henry, 1832-1921, ed Subjects: Publisher: London [etc.] Cambridge University Press Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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Text Appearing Before Image: semblesthe corresponding crest in the recent genus Basilicus. The occipital condyle is very small, and nearly hemispherical inform. It is directed backward, and but slightly downward, thusdiffering from this part in most of the members of the group. The Lower Jaws.—The lower jaws are very long, and quitesharp in front, corresponding closely in this respect with the end ofthe upper jaws. The rami are closely united by a symphysis whichextends from the apex to beyond the posterior extremity of thedentary bone, as in the mandible of Bhynchops, and some otherbirds. Behind the symphysis, the rami are comparatively slender.The upper face is strongly concave. The articulation for the quad-rate is deeply grooved obliquely, and the joint is a very strong one.The front portion of this mandible during life was evidently pro-tected by a horny covering, like that of the beak above. The nearly complete skull here described may be regarded as a Prof. 0. C. Marsh—New Cretaceous Pterodactijls. 347

Text Appearing After Image: 348 Prof. T. R. Jones—On some Palceozoic Phyllopoda. type of the genus Pteranodon. Its principal measurements are asfollows :— Length, from extremity of sagittal crest to end of pre- maxillary, about 30 inches, or 760* millimetres. Transverse diameter of occipital condyle... 8-4 Distance from occipital condyle to distal end of quadrate 105 Length of lower jaw, about 23 inches, or 585 Greatest depth 62 Depth at articulation for quadrate 23- The skull of Pteranodon ingens, described by the writer from thesame geological horizon, is about four feet in length. The skull of Pteranodon differs especially from that of the otherknown Pterosauria in the following particulars : (1) the absence ofteeth; (2) the absence of anterior nasal apertures distinct from theantorbital openings ; (3) the presence of the elongated occipitalcrest; (4) the whole jaws were apparently covered with a hornysheath, as in recent birds. Yale College, New Haven, April 2ith, 1884. EXPLANATION OF FIGURES on p. 347.F

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