26 ON BONES AND TEETH OF EXTINCT LIZARD, 
deposits abounding in Diprotodont and other remains which 
the writer has been accustomed to regard as, in Queens- 
land, newer pliocene, not strictly pleistocene. Thus corrected, 
he has no other sufficient reason to doubt that the teeth, and 
consequently the other bones to be referred to the same lizard, 
are those of Notiosaurus dentatus, Owen., and under that name, 
proceeds to describe them. The first, in order of discovery, which 
at one time appeared to him to belong to an undescribed genus, 
is a bone of the fore limb—a left humerus in perfect preservation 
as far as the interval between the radial tuberosity and the head, 
which is unfortunately lost. Before examining the proofs yielded 
by this fossil that Notiosaurus was congeneric with the existing 
Varans of Australia, Monitor, Hydrosaurus and Odatria, and 
yet was not generically identical with either of them, it may be 
well to facilitate comparison by tabulating the measurements of 
this fossil with those of a species of each recent genus:— 
N otiosaurus Monitor Hydrosaurus Odatria 
dentatus. gouldi. giganteus. punctata, 
c.m. c.m. e.m. c.m, 
* 
Entire length ... { (estimated) ; 5:0 na Oa 
Length to summit of ) : ' : A 
radial tuberosity $ 17°0 oe 80 
Breadth of distal end... 10°7 aw 20 0 Pb eG 
Breadth of articula- ) : : é 
ting surfaces ...... 5 7-2 con ear 
Least breadth of : , : , 
_ sea } B2 a. O65 seo, OB De agente 
Thickness of distal t , : . 
CNC earn ascsee veces } Ds OC ee 
* Hight inches. 
The length of the specimen of M. gouldi, of which the humerus 
was measured, was 34 inches; that of H. giganteus 58 inches, 
and that of O. punctata 17 inches. From the figures tabulated 
it appears that in the extinct lizard the arm was considerably 
shorter, in preportion to its breadth, than in the living species. 
The vastly greater area of the articulating surfaces of the elbow- 
joint is especially remarkable; not only is it much longer from 
back to front, by reason of the greater thickness of the bone in this 
