[Proc. Roy. Soc. A'ictokia, 18 (N.S.), Pt. II., 1905]. 



Art. VJJ. — New or Little-knoivii Victorian Fo8sll>i in 

 the Natioud! Museum, J\Ielhourne. 



Part VII. — A Nkw Cepiialaspid, from thk Silurian of 

 Wombat Creek. 



By FREDERICK CHAPMAN, A.L.S., &c., 

 National Muse ii in. 



(With Plates VII., VIII.). 



[Bead 14th December, 1905]. 



Contents. page. 



Introductory Remarks - - - - 93 



Description of the Fish - - - - 94 



Affinities - - 96 



Occurrence ------ 97 



Associated Fossils at Wombat Creek - 99 



Introductory Remarks. 



The subject of the following notes was included in a series of 

 fossils collected by W. H. Ferguson from Wombat Creek, and 

 submitted to Sir Fredk. McCoy for determination by the Mines 

 Department, Melbourne, about April, 1894.^ The occurrence of 

 this tish is of very great interest, notonly on accountof its being the 

 oldest recorded vertebrate from Australia, but also that it repre- 

 sents a species of the genus Thyestes, which is by far the largest 

 yet described. The genus Thyestes (=:Auchenaspis, Egerton) has, 

 up to the present, been characterized by small-sized species as com- 

 pared with the tishes l)elonging to the allied genus Cephalaspis. 

 The specimen now before us vies, in point of size, with the 

 majority of the species of the last-named genus. 



I I have been unable to find any notes or comments with these specimens. 



