24 
RECORDS OF THE AUSTRALIAN MUSEUM. 
II. — The Reptile Remains. 
To return to Messrs. Tweedie and Wollaston’s reptile, Cimolio- 
saurus Uucoscopelus , the remains that can be satisfactorily deter- 
mined from the mass of opalised material are as follows : — 
17 Cervical vertebrae, usually fragmentary. 
2 Humeri. 
4 Teeth. 
Rib fragments (numerous). 
Phalanges (numerous). 
The absence of the skull practically bases systematic determina- 
tion on the vertebrae and teeth, hence the following facts in the 
first place lead to the conclusion that it is a Sauropterygian : — 
(1) the vertebrae are amphicoelus; (2) the single costal facets of 
the cervical vertebrae are entirely on the centra ; (3) each rib 
articulates to a single vertebra ; (4) the epiphyses of the humeri 
are enlarged ; (5) the teeth have more or less curved and sharp 
crowns with fluted enamel. 
In the second place the form of the cervical vertebrae, and the 
absence of a foramen in the humeri indicate the Plesiosauridae as 
the family to which these remains should be referred ; whilst 
within this family the complete anchylosis of the neural arches 
and cervical ribs to the centra, single coital facets on the cervical 
vertebrae, and the slender and n on-car inated teeth point out 
Cimoliosaurus, Leidy, as the natural resting place of this reptile 
from White Cliffs Opal-field. 
The cervical vertebrae are much elongated between their dorsal 
and ventral extremities. They vary in size, as usual, according 
to their position in the whole series, but the measurements of 
three of the more perfect and typical are as follows : — 
1. 
2. 
3. 
Length of centrum body 
1 in. 
i* 
1 in. 
Height „ „ 
n 
lllf 
Lrg- 
Breadth „ ,, 
n 
m 
Height, including neural spine 
H 
. . . 
Breadth of cup 
Fore and aft extent of neural spine at 
7 
8 
l'rV 
1 lV 
about the middle 
A 
8 
... 
... 
Fore and aft extent of the neural arch 
below the zygopophyses 
tt 
A3 
16 
lo 
1 6 
Fore and aft extent of costal surface ... 
A 
8 
A 
8 
5 
8 
Height of neural canal 
7 
re 
iV 
A 
2 
Breadth ,, ,, 
7 
1 ® 
16 
5 
8 
The measurements are in inches and parts of inches. 
