IX 
UTHOR S 
f 
REFACE. 
The material employed in t lie picsent number of the “ Monograph of the 
Silurian and Devonian Coials of New South Wales,” forming Part II of that 
Avork, and comprising the genus Try plasma, is derived chiefly from the 
collections of the Australian Museum, and the Mining and Geological 
Museum, attached to the Department of Mines, Sydney. Specimens in the 
cabinets of the Geological Department, University of Sydney, and the 
Geological Class-room at the Technical College, Ultimo, have also been made 
use of. 
The specimens in the Mining and Geological Museum and the 
Australian Museum we oavc mainly to the untiring efforts of Mr. Charles 
Cullen, late Collector to the Geological Survey, and Mr. A. J. Shearsby, late of 
the Australian Joint Stock Banking Company, at Yass, respectively, and 
were placed at my disposal by Mr. E. E. Pittman, A.R.S.M., Under Secretary 
for Mines and Agriculture, on the one hand, and the Trustees of the Australian 
Museum on the other. The University corals were chiefly collected by the 
late Mr. Charles Jenkins, L.S., of Yass, and my thanks are tendered to 
Prof. T. W. E. David, B.A., for the use of them, and to Mr. C. A. Siissmilch, 
Eecturer on Geology, Technical College, for the loan of those in his teaching 
collection, collected by himself. 
As in all my work of late years, I have been cordially assisted by 
Mr. W. S. Dun, Palaeontologist to the Geological Survey. 
R, ETHERIDGE, June. 
Sydney, May, 1906. 
B 
