In 1869-70 Charles Moore described and figured a number 

 of fossils that had been collected in Queensland by the Rev. 

 W. B. Clarke, among which were two examples of crinoids 

 contained in calcareous nodules obtained at the Amby River, 

 Mitchell Downs, and which were named by Moore, Pentacrinus 

 australis. One of the specimens exhibited the base of the 

 pelvis with the lower portions of three arms and the basal 

 stumps of two others. The other specimen, from the same 

 locality, shows the interior of the pelvis with truncated 

 portions of several arms extending from it. 



In 1892, Robert Etheridge x jun., in his "Geology and 

 Palaeontology of Queensland" (p. 439), reproduces Moore's 

 descriptions and plates, but no further examples had, at that 

 date, been found. 



Subsequently, the late Mr. George Sweet, of Melbourne, 

 made a valuable collection of Cretaceous fossils in Queensland, 

 which was placed in the hands of Mr. Etheridge for determina- 

 tion, the publication of which forms Bulletin No. 13 of the 

 Geological Survey of Queensland. In Sweet's collection there 

 were two specimens of crinoids which were referred by 

 Etheridge to* Moore's species, P. australis, but subsequently, 

 following the lead of F. A. Bather (Nat. Science, xii., 1898, 

 p. 245) in his redefinition of the genus Pentacrinus, Etheridge 

 placed the Queensland specimens under Isocrinus, Von Mever. 

 The specimens, like those described by Moore, are much 

 crushed and imperfect. Etheridge concludes that Isocrinus 

 australis possessed five radials supporting as many rays or 

 arms, and these latter were each divided at a higher level 

 into two, and then, each of these divided arms was again 

 forked at least seven times, or fourteen times to each radial. 

 In no case has a radial arm, or brachium, been found com- 

 plete, but it is considered that the arms must have been, at 

 least, 8 in. in length. 



I have now the pleasure of recording the occurrence of 

 two more examples of this species. The specimens were 

 received by the President (Sir Joseph Verco) from Mr. M. 

 W. Hackendorf , late of Stuart Range, and were obtained from 

 the precious opal deposits of that locality. The specimens 

 form pseudomorphs in precious opal, but are coated with a 

 thin superficial layer of a ferruginous kind which obscures 

 the opaline structure. As the specimens are more or less 

 covered by small circular-shaped lichens, they must have 

 formed surface stones on the outcrops. The two specimens 

 are of about equal size and character and consist of portions 

 of brachia, or arms, which have been broken off at the 

 radials near their basal connection, with the respective calices 



