. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 254 Prof. H. G. Seeley on the Ornithosaurian Pelvis. identification of the prepubic bone, which rests on inductive evidence, is the more interesting; since it shows that the main pelvic differences between the Ornithosauria and Ornithischia are in the less breadth of the ischium, in the prolongation backward of a posterior pubic process, and the greater depth of the ilium. The pelvic features in which the two groups agree appear to be the development of the anterior and poste-
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 254 Prof. H. G. Seeley on the Ornithosaurian Pelvis. identification of the prepubic bone, which rests on inductive evidence, is the more interesting; since it shows that the main pelvic differences between the Ornithosauria and Ornithischia are in the less breadth of the ischium, in the prolongation backward of a posterior pubic process, and the greater depth of the ilium. The pelvic features in which the two groups agree appear to be the development of the anterior and poste- rior processes to the ilium, the posterior approximation of the ischium, the short development of the anterior process of the pubis, and the possession of prepubic bones. The distinctive pelvic character is the development of the posterior process of the pubis ; and although this process attains a similar deve- lopment in birds, birds have practically lost the anterior processes of the pubes and have entirely lost the prepubic bones. Thus, considering pelvic characters only, there is a certain Ornithischia. Saurisehia. Aves. Diagram of Pelvic Relationship in the Ornithomorpha. community of structure between the Ornithosauria, Ornith- ischia, and Crocodilia in the possession of prepubic bones, and between Saurisehia and Aves in wanting those 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
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