MOORE—-AUSTRALIAN MESOZOIC GEOLOGY. OSy 
important group of shells. A fourth genus is represented by some 
very curious Strophomena-like shells, belonging to a group formerly 
placed by Dr. Deslongchamps under Argyope, but subsequently re- 
moved by him to the Terebratulide. ‘The three French species, 
A. liasiana, A. Perrieri, and A. Suessii, | have found in England in 
the Lias, as also a minute shell, the Spirifera oolitica, mihi, which 
will have to be arranged with them. ‘The peculiar form of these 
shells, their long hinge-lines, compressed valves, and finely folded 
or plicated exteriors, even in ignorance of the internal form of the 
loop, are, I think, sufficient to justify their arrangement eventually 
under a new genus or subgenus. I have two species from Wollum- 
billa, A. punctata and A. wollumbillaensis. 
All the above Brachiopods occur together in the blocks which yield 
Purisiphonia. 
Lameliibranchiata.—The importance of this class in connexion 
with the paleontology of Queensland is indicated by the fact that 
the collection includes 22 genera and 36 species; and there are 
fragmentary evidences of others that would still increase the list. 
Of this group the Aviculide are the most frequent, of which there 
are eight or nine species. One of these is the A. braamburiensis, 
Phil., of our Oxford Clay, the only shell in this class which can be 
satisfactorily identified with a Huropean species. Most of the 
other Aviculids from Queensland have a reticulated ornamentation, 
and evidently belong to the group of which the above shell may be 
considered a type. Species of Zima and Pecten are also abundant, 
one species of the latter genus approaching the P. retiferus of the 
Great Oolite, whilst. another is not unlike P. rigidus of the same 
formation. Cytherec, equalling in size any of the Tertiary species, 
appear also to have been abundant; the most noteworthy of the 
other genera are Vhracia, Panopwa, Mya, and Trigonia, to which 
allusion has already been made. 
Gasteropoda.—Seven genera, including ten species, occur in 
Queensland, the prevailing shell being Natica variabils. The others 
are generally represented by solitary examples, the worn state of 
some of which prevents specific comparisons. 
Cephalopoda.—No trace of any Ammonites, which are so abundant 
in the Western Australian beds, appears in the collection from 
Queensland. The specimen, the inner whorls of which were referred 
to that genus, is a gigantic Orioceras, which exceeds in size any 
specimen I have ever seen from Neocomian strata, wherein that 
genus attains its largest dimensions. ‘This specimen is in a dark- 
blue limestone matrix, and the portions preserved retain their test ; 
but unfortunately, except a crushed Rhynchonelia, there are no other 
remains associated with it to assist us in arriving at its precise geolo- 
gical age. 
The only other genus is Belemnites. Examples of this occur under 
three conditions :—Ist, as detached frusta, as much water-worn as 
if they had come from Postpliocene gravels; 2ndly, in blocks having 
a sandy matrix, containing small pebbles, coloured by manganese 
(here, again, they were very much broken or abraded before they were 
