MONOTEBME FROM NEW SOUTH WALES. 
275 
larger than either of those from New Guinea formerly existed in Australia. I cannot 
conclude without referring to the humerus of a similar exceptional type, but of con¬ 
siderably larger size, which was so associated with vertebral, pelvic, and femoral 
remains of a Reptilian character as to lead me to refer these fossils to the cold-blooded 
air-breathing class 4 ' under the generic name Platypodosaurus. It is noteworthy, in 
relation to a geographical approach to the present limited and exclusive locality of the 
modification which brings Mammals nearest to Reptiles, that the Platypodosaurian 
remains should have been discovered at the southern extremity of the African 
continent. 
As corresponding parts of the humeri of the existing and extinct kinds of Echidna 
are denoted by the same letters in the drawings accompanying the present paper, a 
! ‘ table of admeasurements ” need only to be added to exemplify the size-characters, 
those of the humerus of Platypodosaurus being added. 
Humerus. 
Echidna hystrix. 
Echidna 
Eamsayi. 
Platypod 
osaurus. 
in. 
lines. 
in. 
lines. 
in. 
lines. 
Length . 
2 
0 
3 
4 
10 
6 
Breadth, of proximal end. 
1 
0 
1 
9 
5 
3 
„ middle of shaft. 
0 
4 
0 
10 
2 
3 
,, distal end. 
1 
9 
2 
9 
5 
10 
Thickness (ancono-thenal) of middle of shaft . 
0 
3f 
0 
8 
2 
6 
Plate 14. 
Fig. 1. Anterior or palmar view of the humerus, Echidna Ramsayi. 
Fig. 2. Posterior or anconal surface of the humerus, ib. 
Fig. 3. Articular head of the humerus, ib. 
Fig. 4. Anterior or palmar view of the humerus, Echidna hystrix. 
Fig. 5. Posterior or anconal surface of the humerus, ib. 
Fig. 6. Articular head of the humerus, ib. 
(Parts of the tuberosities b and c are broken off in the fossil.) 
All the figures are of the natural size. 
Quarterly Journal of the Geological Society, August 1880, p. 414, plate xvi c , fig. 7. 
