j„r, 12 ym 



12c 



FURTHER DESCRIPTIONS OF UPPER SILURIAN 



FOSSILS FROM THE LILYDALE LIMESTONE, UPPER 



YARRA DISTRICT, VICTORIA. 



By R. Etheridge, June., 



(Pal?eontologist to the Australian Museum, and Paleontologist 

 and Librarian, Geological Survey of New South Wales.) 



(Plates xviii. — xix.) 



The additional fossils about to be described, are like the former 

 collection,* obtained by Mr. A. J. North, from the Cave-hill 

 Quarries, Lilydale, Victoria. 



When publishing the former descriptions I overlooked a short 

 account of the Lilydale Limestone by the Rev. A. W. Cresswell,! 

 who gives the following particulars regarding it. The limestone is 

 about one hundred feet thick, interstratified with the Upper 

 Silurian rocks of the district. It is believed to be a lenticular 

 patch, the prevailing colour being cream. As regards the fossil 

 contents Mr. Cresswell makes the following remarks : — " Several 

 specimens of a sub-genus of Turbo, one of them being as large as 

 a good sized recent Turbo undidatus. The form appears to me to 

 be close to Euclieliis, there being no umbilicus or the columella 

 showing trace of being toothed, it is veiy like our common recent 

 EiiclipJns cannlicidatus, but has finer and more numerous lira?. 

 The nearest shell to it in Murchison's "Siluria," appears to be 

 Cydonema coraUii of the Upper Ludlow, with which it is perhaps 

 identical. Several specimens of MurcMsonia, apparently corres- 

 ponding to M. corallii of the Upper Ludlow, as figured in Mur- 

 chison's " Siluria." A Belhrophon ; and several 



specimens of the common Upper Silurian species of Favosites 

 called Favosites aspera . . . ; a single joint of Crinoid stem, 

 probably an Actinocrinus.'^ The strike of the beds is meridional. 



I have not seen any shells which could be regarded as co-specific 

 with Cyclonema corallii, or Murchisonia corallii, from the British 

 Ludlow rocks. These are small species and not to be compared 

 to those herein afterwards described. 



Prof. R. Tate, F.L.S., has been kind enough to supplement my 

 previous descriptions by notes from specimens in his Collection, 

 which will be found in their proper places. He however remarks 

 of Niso ? hrazieri : — " I imperfectly observe that the aperture is 

 rounded in front, and not angulated as in the Recent and Tertiary 

 species of Niso." 



* Eecords Australian Museum, 1890, I., pt. iii., p. 60. 



t The Queen's Birthday Excursion to Lilydale, Ftcfoj-ian Naturalist, 

 1885, II., No. 3, p. .35. 



A— .Tuue,|1891. 



