| OCR Text |
Show 164 DR. R. J. ANDERSON ON THE [Mar. 16, 1. 2. 3. 4. 5. 6. 7. 8. 9. 0. 1. 2. PELVIC GIRDLE. Pubis. Ischium. Ilium. Subilium. Wanting. Wanting. Pelvisternum. (Ischio-pubic symphysial cartilage. Osseous pelvisternum of Edentates.) Hemi-pelvisternum. Ischio-pubic symphysis. Prepelvisternum. Hemi-pelvisterna. Epipelvic ossicles of Chameleons. Marsupial bones of Monotremes and Marsupials. Post-pel visternum. Os cloacae of Lacertilians. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. SHOULDER-GIRDLE. Procoracoid. Coracoid. Scapula. Subscapula. Clavicle. Interclavicle. Omosternum. Coraco-procoracoid symphysial cartilage. Hemi-omosternum. Symphysis coraco-procoracoid. Preomosternum. Preomosterna of Anoura. Hemi-preomosterna. Substernal bones of mammals. Post-omosternum. The pelvis of Lacerta muralis is figured by Prof. Hoffmann in Bronn's ' Thierreichs,' and Briihl also gives figures of the Amphibian forms. In a specimen of Iguana tuberculata in this museum the pubis is a separate bone, and contains a preacetabular foramen as well as a well-marked supra- or prepubic notch. A copula (bone) reaches from the anterior part of the ischium to the pubis, wider behind than in front. The os cloacae fits into the ischial symphysis behind, and the ischial symphysis still shows the marks of union with the tuberosities. The ilia articulate each with two transverse processes, and the traces of union with the ischium are obliterated. In the Australian Monitor gouldii which we have, a prepubic nodule fits in between the pubes in front; all traces of union between the parts of the ossa innominata are obliterated. A small nodule is situated in front of the ischial symphysis, and a distinct os cloacae is present behind, and, as in the Iguana, fits in between the ischia. A prominent ischial spine behind is situated at the junction of the middle and outer third of the posterior border of that bone. In Lacerta viridis a prepubic nodule and a postischial are present. In the West-Australian Moloch horridus (marked 1845 in the catalogue) the postischial bone is quite evident, and a large copula runs forwards to the pelvis. In our Chameleon the three pelvic bones are short, and the os cloacae seems to be cartilaginous ; the ischio-pubic copula is reduced to a thread-like structure. The os cloacae and prepubic bone are thin in our specimen of Ameivu, but they are very distinct. Prof. Owen, in his • Anatomy,' says that in the Potoroo there is a triangular ossicle developed at an early period, which is wedged into the posterior interspace of the ischio-pubic symphysis; and in his paper in this Society's'Transactions' he figures the posterior epiphysial bone. In the skeleton of a Kangaroo in our museum the following measurements were made:- |
