311 



THE SILURIAN TRILOBITES OF NEW SOUTH WALES, 



WITH REFERENCES TO THOSE OF OTHER 



PARTS OF AUSTRALIA. 



By R. Etheridge, Junr. — PaljEontologist to the Australian 

 Museum, and Geological Survey of N. S. Wales — and John 

 Mitchell, of the Public School, Narellan. 



Part I. 



(Plate xxv.) 



Introduction. 



In this and following papers, we purpose, as stated in a late 

 communication to this Society,* to give descriptions of the 

 Silurian Trilobites of New South Wales, with passing references 

 to those found in other parts of Australia. In the paper referred 

 to we briefly mentioned the sources of our material. We shall 

 endeavour to comprise the whole of the species of one genus 

 within the compass of each paper, both as a means of comparison 

 inter se, and with the view of convenient subdivision of the 

 subject. Unless otherwise stated, the figured specimens are all 

 taken from the collection of one of us. 



We commence with the family Proetidae. 



Family PROETID.E. 



Our knowledge of the Silurian Proetidse of Australia is com- 

 prised in four descriptions of species by Sir F. McCoy, the late 

 Messrs. de Koninck and Ratte, and one of us. The first-named 

 naturalist describedf from the Wenlock shale of Broadhurst Creek, 



* Proc. Linn. Soc. N. S. Wales, 1890, v. (2), Pt. 3, p. 501. 

 t Prod. Pal. Vict., Dec. m., 1876, p. 17, t. 22, f. 10, 10a. 



