. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 252 Prof. H. G. Seeley on the Ornithosaurian Pelvis. the Crocodilian theory of the Ornithosaurian pelvis enunciated by von Meyer and adopted by Owen and Zittel, if we first conceive that the pubic bone has been practically eliminated Fiir. Ventral Aspect of Pelvis of Alligator. from the pelvis of the Crocodile. Further evidence of this elimination is, I think, to be found among existing birds and among the fossil reptiles named Ornithischia, which have the pubic bones les
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 252 Prof. H. G. Seeley on the Ornithosaurian Pelvis. the Crocodilian theory of the Ornithosaurian pelvis enunciated by von Meyer and adopted by Owen and Zittel, if we first conceive that the pubic bone has been practically eliminated Fiir. Ventral Aspect of Pelvis of Alligator. from the pelvis of the Crocodile. Further evidence of this elimination is, I think, to be found among existing birds and among the fossil reptiles named Ornithischia, which have the pubic bones less developed than among Ornithosaurs. In the Iguanodon bernissartensis (fig. 15) the pubic bone is very short as compared with the ischium. The pubis resembles in a general way that of an embryo bird in having distinct anterior and posterior limbs. The slender short posterior limb of the pubis extends backward parallel to the slender ischium, as in adult birds; but the anterior limb is wider, stouter, and directed forward, but is still short as compared with the ischium. It is obvious that, as in Ornithosaurs, there is no possibility among Ornithischia of the pubic bones meeting ventrally in a median symphysis. But the wide, fonvardly- directed process of the pubis resembles in its extension the ventral process of the pubis in many Ornithosaurs. Further forward in the skeleton are found the pair of bones which have been variously regarded as clavicles and sternal bones in species of Iguanodon and allied genera. These bones present the most remarkable resemblance in form to the pre- pubic bones in Dtmorpkodon, and from their relation to each other seen in Iguanodon I conclude that they may be identified. 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 London, Taylor and Francis, Ltd
Size: 1671px × 1496px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
