The Reptilian Subclasses Diapsida and Synapsida and the Early History of the Diaptosauria

The Reptilian Subclasses Diapsida and Synapsida and the Early History of the Diaptosauria

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 edition. Excerpt: ...with P11lmo/zatteria, and that it is not a near ally of the Theriodonts. In only one important character does it resemble the Theriodonts, viz., the possession of an ossified precoracoid; while the possession of abdominal ribs, a persistent notochord, and the presence of 3, 4, 5, and 4 phalanges in the 4 outer digits, remove it far from the Dicynodonts, the Theriodonts, and the Monotremes, and place it somewhere among the primitive Rhynchocephalians, --possibly not far from Palaeo/zatteria." 1Q. J. G. S., Vol. XXIII, pp. 142-144. 'Proc. Roy. Soc., Vol. XLIV, p. 383, 1888. 3Cat. Foss. Rept. Amphib., Pt. IV, p. 12. ' On the Remains of Proeolopllon in the Albany Museum. Records of the Albany Museum, Vol. I, No. I, April 24, I903. This conclusion, which is sustained by abundant evidence, is of very great importance, because Procolop/zon is not only by far the most primitive of the Diapsida, but the most nearly transitional between the Diapsida and their theoretical Cotylosaurian ancestors. Its principal characters, as enumerated by Seeley and more fully by Broom (o/9. cz2.), are as follows: SKULL.---Short, triangular, with sinuous sutures of Cotylosaurian type, and with all the elements characteristic of the Cotylosaurian skull, separate and distinct, including the 'epiotics, ' the paired prevomers, and median true vomer or parasphenoid, also the separate ectopterygoids. Separate epipterygoids (columellaa cranii). Large orbits confluent posteriorly with the supratemporal fenestrae. Posterolateral 'auditory notch' characteristic of certain Cotylosauria and Stegocephala. Large pineal opening. Small, perhaps rudimentary laterotemporal fossae. Palate with typical primitive reptilian arrangement, namely, pterygoids...
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Product details

  • Paperback | 28 pages
  • 189 x 246 x 2mm | 68g
  • United States
  • English
  • black & white illustrations
  • 1236947290
  • 9781236947291