. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 242 Prof. H. G. Seeley on the Ornithosaurian Pelvis. the subclass or order that the fracture would sometimes take place on one side only and that sometimes fragments of the broken bone would remain in contact with the part of the pubis with which it is supposed to have been continuous, while the prepubic elements might also be expected to show evidence of fracture; but there is no specimen in which a recognizable portion of the element termed prepubic is seen coossified with t
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 242 Prof. H. G. Seeley on the Ornithosaurian Pelvis. the subclass or order that the fracture would sometimes take place on one side only and that sometimes fragments of the broken bone would remain in contact with the part of the pubis with which it is supposed to have been continuous, while the prepubic elements might also be expected to show evidence of fracture; but there is no specimen in which a recognizable portion of the element termed prepubic is seen coossified with the pubic bone; and even when the pelvic sutures between the other bones are preserved there is no evidence of fracture, but sharply defined separation of these prepubic ossifications from the pubic bones, as in the specimen of Cycnorhamphus at Stuttgart. The bones, even when not anchylosed together, have usually remained in nearer contact with each other than with the pubic bones: and this seems to me better consistent with separate ossification than with fracture. Moreover they always show forms and proportions which suggest complete ossifications; and this does not seem to be evidence to support the hypo- thesis that these bones are fractured portions of the pubis. The following facts contribute towards a clearer conception of the pelvis. If we examine a specimen like that named Pterodactylus grandipelvis (von Meyer, Fie:. 1. Kept, lithog. Schiefer, T. vin. fig. 1) it is manifest that the sacrum widens anteriorly in the transverse direction (fig. 1). The same character is shown in a sacrum of Rhamphocepha- lus from the Stonesfield Slate, in the collection of the Rev. P. B. Brodie, It is at present uncertain whether the character is common to all Ornithosauria. From this con- dition of the sacrum it follows that since the bones in the ischiac region of the pelvis approximate towards each other closer than those in the pubic region, the pubic bones cannot meet in a media
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