486 



THE SILURIAN TRILOBITES OF NEW SOUTH WALES, 



WITH REFERENCES TO THOSE OF OTHER 



PARTS OF AUSTRALIA. 



By R. Etheridge, Junr. — Curator of the Australian Museum 

 — AND John Mitchell, Public School, Narellan. 



Part III. 

 The PHACOPID.E. 



(Plates XXXVIII. -XL.) 



The family of the Phacopidae is one of the most important to 

 be met with in our Lower Palaeozoic rocks, both on account of 

 the wide distribution of its members geographically — being met 

 with in the Silurian rocks of both N.S. Wales, Victoria, and Tas- 

 mania — and their close connection with those of similar deposits 

 in the Old World. 



The literature of the family is very limited, and is confined to 

 the description by Sir F. McCoy of species referred* by him to the 

 following : — 



L Odontochile caudatns, Briin., sp. 



2. Portlockia fecundus, Barr., sp. 



and by Mr. A. F. Foerstef to — 



3. Phacops serfritus, Foerste. 



The horizons yielding these fossils are : — 



a. Olive mudstones of Broadhurst's Creek, near Kilmore, Vic- 



toria — No. 1. 



b. Arenaceous beds of Yerring, Upper Yarra, Victoria — No. 2. 



c. Olive-brown mudstones of the Bowning District, N.S. 



Wales— No. 3. 



* Prod, Pal. Vict. 1876, Dec. iii. pp. 13-16. 

 t Bull. Sci. Lab. Denison Univ. 1888, iii. 



