164 DR. R. J. ANDERSON ON THE [Mar. 16, 
PELYIC GIRDLE, SHOULDER-GIRDLE, 
1. Pubis. 1, Procoracoid. 
2. Ischium. 2. Coracoid. 
3. Ilium. 3. Scapula. 
4, Subilium. 4, Subscapula. 
5. Wanting. 5. Clavicle. 
6. Wanting. 6. Interclavicle. 
7. Pelvisternum. 7. Omosternum. 
(Ischio-pubic symphysial carti- Coraco-procoracoid symphysial 
lage. Osseous pelvisternum of cartilage. 
Edentates. ) 
8. Hemi-pelvisternum. 8. Hemi-omosternum. 
9. Ischio-pubic symphysis. 9. Symphysis coraco-procoracoid. 
10. Prepelvisternum. 10, Preomosternum. 
Preomosterna of Anoura. 
11. Hemi-pelvisterna. 11. Hemi-preomosterna. 
Epipelvic ossicles of Ohame- Substernal bones of mammals. 
leons. 
Marsupial bones of Monotremes 
and Marsupials. 
12. Post-pelvisternum, 12. Post-omosternum, 
Os cloace of Lacertilians. 
The pelvis of Lacerta muralis is figured by Prof. Hoffmann in 
Bronn’s ‘ Thierreichs,’ and Brihl 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) 
teaches from the anterior part of the ischium to the pubis, wider 
behind than in front. The os cloacze 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 pro- 
cesses, 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 cloacee 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 cloacee seems to be cartilaginous ; the ischio-pubic copula 
is reduced to a thread-like structure. The os cloace and prepubic 
bone are thin in our specimen of Ameiva, 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 :— 
