804 CARBONIFEROUS AND SILURIAN FOSSILS FROM CENTRAL N.S.W. 



across the creek at Bevan's. The matrix is a fine-grained sand- 

 stone stained with iron. The moulds left by the removal of the 

 original shells are again filled in, and the casts can be easily 

 separated from the enclosing rock. I am once more indebted to 

 Mr. Etheridge for examining some specimens sent to the Depart- 

 ment of Mines. The following were recognised : — Rhynchonella 

 Wilsoni, var. Davidsoni, McCoy ; Orthis sp. 



The first-named shell is another characteristic form from the 

 Wenlock limestone of England. I can find no record of its 

 occurring elsewhere in New South Wales. Prof. M'Coy (Prog. 

 Rept. No. IV., p. 155) makes mention of it in a tabular list of 

 Victorian fossils, with the remark, "limited to the Upper Silurian." 



At Balowra, fourteen miles south-east of Nymagee, about a 

 square mile of limestone is exposed, on the road to Nangeribone. 

 In some places the stone seems entirely composed of indeterminable 

 casts of Crinoidal stems ; a limestone with Crinoidal casts is also 

 found twenty-five miles to the east of the Rookery beds already 

 referred to. 



The little that is yet known of the rocks and fossils enumerated, 

 the nature of the country, the scarcity of any sections of strata, 

 and the difficulty of even getting together the slender materials for 

 the above observations, may give these notes some little value. 



Note. — Since this paper was written, the Annual Report of the 

 Department of Mines, New South Wales, for the year 1887, has 

 been published. On p. 166, Mr. Etheridge, Palaeontologist to the 

 Geological Survey, records the following additional species from 

 the Rookery Limestones, from specimens collected by Mr. W. 

 Anderson and myself : — Beyrichia sp. ; Fenestella sp. ; Heliolites 

 sp. ; Chonetes striatella, Dalman ; Spirifera crispa, Linn. ; Atrypa 

 reticularis, Linn. ; Fentamerus sp. ; and Rhynchonella Wilsoniy 

 Sby. 



