122 NEW QUEENSLAND LOCALITY FOR ZYGOMATURUS. 



collaborator in " The Geology and Palaeontology of Queens- 

 land," who handed them for determination to Mr. C. Hedley. 

 Mr. Hedley reported: — "I am unable to match the pon- 

 derous inflated Unio with either figure or specimen. Accepting 

 the value of the species admitted in Smith's Monograph on the 

 Freshwater Shells of Australia, it would equally approach U. 

 Hii.stirilifi, r, (iitihii/mis, and U. Shuttleu-orthi. I should like to 

 see it figured as a phase of U. australis. The remaining shells 

 correspond exactly with recent South Queensland examples of 

 Corhicnla nepeanensis, Lesson, Melania balojmensis, Conrad, and 

 Haiira jarvisjensis, Quoy and Gaimard, var. (Hlberti, Pfeiffer." 



It may be frankly admitted that the association with the 

 extinct fauna of four species of freshwater molluscs, all or 

 almost certainly all, still extant in this same geographical area, 

 does not prove that the extinct fauna was not living in Queens- 

 land some way back in Tertiary times, but the fact shifts the 

 onus of proof to the shoulders of those who claim a greater 

 antiquity for the fauna than post-Tertiary. 



It is well known that Sir Richard Owen did not admit the 

 genus Zyiiomaturm, and regarded the animal described by 

 Macleay as belonging to the genus Xutothermm. (e) Mr. De Vis, 

 on the other hand, (/) considers Macleay's genus Zygomaturus 

 as valid. Mr. R. Lydekker agrees (tj) with Sir Richard Owen in 

 referring Macleay's Zyyomaturus to Xototlwrium. Professor 

 Huxley, in 1802, wrote (//) as follows : — 



" I employ Mr. Macleay's generic name Zurjuinaturm for 

 the fossil skull which he originally described, because, until a 

 lower jaw has been discovered in connection with such a skull, 

 and that lower jaw turns out to be generically identical with 

 the mandible upon which Professor Owen founded his genus 

 Nototherium, the identity of Xototlierium and Zyiiomatiinifi cannot 

 be considered to be proved." 



Fortunately, the lower jaw is present in the Floraville 

 specimen, and Mr. DeVis will have an opportunity of forming 

 an opinion in the light of the new material. 



(e) Q. J. Geol. Soc, XV. (1858), p. 168. 



(f) Proc. Eoy. Soc. Queensland, 1888, V., part 3, p. 111. 



(g) Ann. and Mag. Nat. Hist,, 1889, III., p. 149. 

 (/() Q. J. Geol. Soc, XVIII. p. 424. 



