6 
with a broad band of scale-like folds, which on the costal portion is 
divided into two by an intercostal groove ; the pattern produced on 
either side of the groove reminds one of a moiety of the skin from the 
bel]y of a snake with ventral scutes. Of a third pleural plate a portion 
is represented by Fig. B, Plate V. This plate being entirely covered by 
the overlying costal shield, of course, bears upon it no dermal groove. 
The nearly entire fourth pleural (Plate V., Fig. C) shows in a well- 
preserved state a slight modification of the surface pattern ; the band 
of scales on either side the groove is wider, and the lateral bands of 
bar-like folds narrower than in the other fragments referred to the 
species. At the distal end the sculpture takes the character of long 
ascending tongues ; these are seen again on the distal end of a 
sixth pleural (Plate V., Fig. D ) The finely- preserved ninth peripheral 
plate of Plate V., Fig. Gr, illustrates the pronounced character of the 
sculpture in this part of the carapace ; above the submarginal groove 
it ascends in bold flame-like tongues, below it reproduces the general 
pattern of the pleural plates. On peripheral plates that have suffered 
much from abrasion of the surface the flame-like elevations are 
reduced to long pointed bract-like etchings. It is with some con- 
fidence that the pygal plate seen on Plate V., Fig. H, is thought to 
pertain to the present turtle, as there are on its distal margin distinct 
indications, not clearly marked by the artist, of the elongated riclges 
borne by the distal ends of the pleural plates. In a fragment of a 
similar plate from the "Warburton Eiver all the superficial tubercules 
are more elongate in form than the generality of those on the entire 
plate figured. On Plate V. an attempt has been made to reproduce the 
form of this carapace as nearly as the paucity of material allows, but 
it must be confessed that all that can be positively said of it is that 
its lateral edges were moderately broad and revolute (cf. Plate VI., 
Fig. C.) In addition to the fragments of carapace figured, sixteen others 
from the Darling Downs and seven from the Warburtou River affirm 
the validity of the species, but do not greatly add to knowledge of it. 
Flastron : In the living species of Ohelodina, the sutures between 
the posterior divisions of the plastron pass each through a band of 
elongate etchings as in contiguous pleural plates. By virtue of this 
as an almost generic condition and an unusually strong development 
of superficial graving as a specific, we may reasonably attribute to the 
plastron of C. insculpta the naturally associated mero- and sacro- 
sternal given on Plate YI. The two other plates included in the con- 
jectural restoration of the plastron on Plate VI. are all the remains of 
this region of the test which have as yet been met with. Log.: 
Darling Downs ; Eight-mile Plains, near Brisbane ; Warburton Eiver. 
PELOCOMASTES* (gen. nov.)— Test smooth ; no nuchal shield ; 
dermal grooves coarse and irregular ; plastron short, broad, depressed ; 
interjugal shields transversely divided, its anterior division marginal ; 
sacrosternal notch moderate. 
PELOCOMASTES AMPLA, n.s.— Eemains of the test of this 
species are easily recognised by the absence of any, or at least of any 
definite, kind of ornamentation on their surfaces and by the peculiar 
uncouthness of their bread deep grooves, which run in curved, often 
rugged, lines and meet in rounded angles. 
* Mud-reveller. 
