[Proc. Roy. Soc. Victoria, 28 (N.S.), Part I., 1915]. 



Akt. X. — New or Little-known Victorian Fossils in the 

 National Museum. 



Part XVIII. — Some Yeringian Trilobites. 



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



(Palaeontologist to the National Museum, Melbourne). 



(With Plates XIV XVI.). 

 [Read July 8th, 1915] . 



Introduction and Summary. 



Descriptions of five Victorian trilobites appeared in Part XIV. 

 of this series 1 , four of which arc restricted to the Melbournian 

 horizons. In the present paper some trilobites of the Yeringian 

 group are dealt with, many of which have already been found in 

 a similar fauna in New South Wales. Our knowledge of the Vic- 

 torian Silurian trilobites shows that the majority of the New 

 South Wales species are found in our upper series, or Yerin- 

 gian, beds; and it seems fairly certain that the Silurian 

 beds in the neighbouring State, are, as at Bowning and Yass, of an 

 Upper or Newer Silurian facies. Not only do the trilobites of this 

 upper series point to a younger phase of the Silurian, but some 

 of the species are closely related to Lower, Middle and Upper 

 Devonian trilobites in Bohemia and North America, such as Goldius 

 greenii, sp. nov. (Lower Devonian), and Cheirurus sterubergi, 

 Boeck sp. (Silurian to Upper Devonian). 



On the other hand, forms like Goldius cresswelU, sp. nov., Proetus 

 euryceps, McCoy sp., Gyphaspis lilydalensis, sp. nov., C. yassen- 

 sis, Eth. fil. and Mitch, (with its Arethusina-like cephalon), Caly- 

 mene angustior sp. nov., and G. blumenbachi, Brongn., are more 

 or less Silurian in aspect 



Eleven species of trilobites are included in this paper: — 

 Goldius greenii, sp. nov. 

 Goldius cresswelU, sp. nov. 

 Proetus euryceps, McCoy sp. 

 Gyphaspis bovmingensis , Mitchell (Also N.S.W 7 .). 



1 Proc. Roy. Soc. Victoria, vol. xxiv., pt. ii., 1912, pp. 293-300, pis. Ixi.-lxiii. 



