304 OCCURRENCE OF DIATOMS, RADIOLARIA AND INFUSORIA, 



One note^vorthy fact about these Port Darwin radiolaria is 

 that no spine-bearing forms are preserved, a fact that apparently 

 is to be noticed in the case of the Maranoa specimens also. 



(c) Ivfusoria. — As far as we are aware fossil Infusoria have 

 not been recorded previously from Australia. 



Dr. Riist (o}). cit.), as already stated, has recorded their occur- 

 rence in the Jurassic rocks of Ilsede in Hanover. 



ii. — Mode of Occurrence. 



In the months of October and November of the year 1885 Mr. 

 (now Dr.) R. L. Jack made a journey through the southern part 

 of the western interior in company with Mr. J. B. Henderson, 

 the Hydraulic Engineer, with the object of fixing a site to bore for 

 artesian water. 



In the Maranoa River, about half-a-mile north of Mitchell, 

 Dr. Jack found bands of a dark-coloured limestone in blue shales. 

 This limestone occurs in the Rolling Downs Beds not far from 

 their base. 



In the " Geology and Palaeontology of Queensland," by Jack 

 and Etheridge, Dr. Jack describes these rocks briefly as follows : — 

 '* On the Maranoa River, about half-a-mile north of the railway, 

 are blue shales with bands of limestone nodules. The shales and 

 limestones at the lowest point down the river dip up the river at 

 about 15 deg. The remainder of the section dips, if anything, 

 up the river, but is practically horizontal. From the limestone 

 nodules I obtained numerous fossils, among which my colleague 

 recognised the Pelecypoda, of which a list is given on a subse- 

 quent page " (p. 404). 



The fossils are as follows : — 



Pelecypoda — Maccoyella Barklyi, Moore. 



Pseudavicula anortiala, Moore. 

 Corbicella (?) maranoana,^th.. fil. 

 Glycimeris Tatei, Eth. fll. 

 ,, 7'ugosa, Moore. 



Gastrochcena austi'alis, Eth. fil. 

 Gasteropoda —iTa^ica variabilis, Moore. 



