Researches on the Structure, Organization, and Classification of the Fossil Reptilia VII Further Observations on Pareiasaurus . they diverge outward and backward, the jaw is somewhat twisted, so that itsinferior border is carried out laterally beyond the alveolar border. Thus the alveolarcontour is a much smaller and more lanceolate curve than the outline of the base of mdcccxcii.—b, 2 u 330 PROFESSOR H. Gh SEELEY OK THE STRUCTURE, ORGANIZATION, the lower jaw. Posteriorly, the articular extremities approach a little towards eachother. The external measurement along the teeth, from the
Researches on the Structure, Organization, and Classification of the Fossil Reptilia VII Further Observations on Pareiasaurus . they diverge outward and backward, the jaw is somewhat twisted, so that itsinferior border is carried out laterally beyond the alveolar border. Thus the alveolarcontour is a much smaller and more lanceolate curve than the outline of the base of mdcccxcii.—b, 2 u 330 PROFESSOR H. Gh SEELEY OK THE STRUCTURE, ORGANIZATION, the lower jaw. Posteriorly, the articular extremities approach a little towards eachother. The external measurement along the teeth, from the median suture outwardand backward, is about 8| inches. There appear to be sixteen teeth in each ramus,though the alveolar margin on the right side posteriorly is not quite perfect. Theteeth are closely placed together ; they are hollow as preserved, with quadrate rootswhich appear to be wedged into the jaw by cement. On the left side posteriorly afew crowns are preserved, and, like the less well preserved crowns on the right side,are smooth with an irregularly striated external surface, and are inclined outward. Fig, 3 Mandible of P. Baini seen from abovo. It snows the bilobed articular condyles behind, and the positions of the teeth in front of the slight compressed coronoid ridge. No crown gives evidence of denticles, being incomplete, so that there is no proof thatthe dentition was the same in both jaws. The transverse width of the jaw over thehinder termination of the teeth is 8^ inches. The total length of each ramus,measuring from the middle suture round the convex external side of the jaw, is 17inches. The length, measuring in a straight line from the front of the alveolar borderto the back of the articulation as preserved, is about 15 inches. AND CLASSIFICATION OF THE FOSSIL REPTILIA. 331 The alveolar border has a width of seven-eighths of an inch, or less. Below its posteriortermination there is an excavation on the inner side, wrhich communicates, apparently,wit
Size: 1509px × 1655px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorseeleyh, bookcentury1800, bookdecade1890, bookyear1892
