MOORE—AUSTRALIAN MESOZOIC GEOLOGY. 259 
Belemnites, is not longer than in youth, and its proportion to the 
diameter is reduced to 240 : 100, 
These fossils appear on the whole most allied to Belemnites has- 
tatus of Blainville, and to the depressed variety of it which occurs in 
the Oxford Clay of England. But thev are entirely distinct by the 
lateral grooves being so sharply cut over the alyeolar and postalveolar 
region, and by the absence of ventral groove. 
There is, indeed, one specimen (the posterior part of a large 
guard) marked Upper Maranoa river, which, with portions of the 
lateral grooves, shows along the ventral face a partially impressed 
but interrupted groove, not unlike some appearances on Belem- 
nites sulcatus of the Oxford Clay of England. The lateral grooves 
show ramifications, and appear not to bend backward. It may be a 
different but allied species. 
Finally there is a small nearly cylindrical Belemnite, with a sub- 
central axis and an acute-angled alveolar cavity. It has one long 
narrow groove, not clearly seen to be a ventral groove. Though 
incompletely exhibited, it must be a distinct species from the others. 
It is marked Upper Maranoa. It is not one of the Canaliculati, but 
more probably one of the Hastati.—J. P. 
Since the above notes were made by Professor Phillips, I have suc- 
ceeded in opening up two imperfectly exhibited specimens in a block 
from Wollumbilla (Pl. XVI. fig. 6), respecting which he remarks “that 
they belong to young Belemnites and show the phragmocone i sztu, 
and the straight nearly central axis of the guard, with a small canal. 
The cross section of the phragmocone is distinctly elliptical and ob- 
long; the siphuncle is clearly enclosed ; longitudinal dorsal strize 
very distinct. I have made a sketch of these points, which on 
the whole make me adhere to the opinion of the Oolitic, and perhaps 
Liassic, affinity of this shell. It appears to be most nearly allied to 
B. paxillosus, but to be distinct by its elliptical phragmocone: this 
ellipticity diminishes with age.” 
DESCRIPTION OF PLATES X.-XVIII. 
(All the figures are of the natural size, except where stated to be otherwise.) 
PuatTe X, 
. Terebratella Davidsonii, Moore, dorsal valve. 
. The same, ventral valve. 
. Argyope wollumbillaensis, Moore, dorsal valve, enlarged one-half. 
The same, ventral valve, enlarged one-half. 
The same, interior of dorsal valve. 
. A. punctata, Moore, dorsal valve, enlarged. 
. Rhynchonella rustica, Moore, dorsal valve. 
. The same. 
. The same, ventral valve, younger specimen. 
10. £&. solitaria, Moore, ventral valve. 
11. R. variabilis, Schloth., dorsal valve, rather enlarged. 
12. The same, ventral valve, rather enlarged. 
13. Discina apicalis, Moore, enlarged. 
14, Lingula ovalis, Sow. 
15, Natica variabilis, Moore, 
Fig. 
MMI OU CON 
