. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 150 Prof. H. G. Seeley on the process is about -^^ inch deep. The anterior process is indistinctly defined, and was produced somewhat forward to a point wliich was not in advance of the pubic process. The acetabulum is an arch with its anterior side inclined forward at an angle of 45°; the posterior side is shorter and more vertical. The pubic process which forms the anterior border is IfV iuch long and margins the front of the acetabu- lum, with a long oblique ridge. The hind
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 150 Prof. H. G. Seeley on the process is about -^^ inch deep. The anterior process is indistinctly defined, and was produced somewhat forward to a point wliich was not in advance of the pubic process. The acetabulum is an arch with its anterior side inclined forward at an angle of 45°; the posterior side is shorter and more vertical. The pubic process which forms the anterior border is IfV iuch long and margins the front of the acetabu- lum, with a long oblique ridge. The hinder border of the acetabulum is at first sharp, but as it ascends it is reflected upward, so as to be flattened or concave on the underside of the posterior process of the ilium. The acetabulum is perforated by an arch which is similar in contour to the external, outline of the acetabulum. This specimen differs from that figured by Professor Huxley in being smaller, in a more acute notch between the anterior process of the ilium and the pubic process, in the much less excavation of the notch between the pubic and ischiac pro- cesses, in the relatively greater length of the pubic process and of the anterior process of the ilium, which characters may possibly be more than individual variation. Tiff. Natural impression from the internal surface of the right ilium of a species of Palceosaun/s. A caudal vertebra (c) in the same slab is drawn posterior to the ilium. Brist. Mus. no. 63. -| nat. size. An example of a right ilium on slab 63, which shows the internal aspect (fig. 3), does not display any marks of attach- ment to the vertebras, resembling in this Megalosaurs rather than Crocodiles. It is as large as in an alligator about 10 feet long. There is the same large development of the posterior process of the ilium seen in all Triassic Saurischia, which is also present in existing Crocodiles, but the margins of the posterior process appear to approximate more rapidly, so as t
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