I.-INTRODUCTION. 
The Possils described in tlie present Monograph are those from the marine 
beds of the Carboniferous and Permo-Carboniferous rocks of N. S. Wales, the 
former lying below and separated by an unconformity from the latter, which 
are intercalated with the prodnctiye Coal-Measures. The distribiiiion and 
general features of these strata will be described and their relations discussed 
in a forthcoming MemoiP by Mr. T. W, Edgeworth David, B.A. ; but, with 
the view of rendering the stratigraphical value of the fossils in question as 
apparent as possible, a generalised classification of the above rocks will be 
found a few pages on. The Invertebrate Pala3ontology of the beds lying im- 
conformably above the productive Coal-Measures has already been published.^ 
Pour systematic descriptions of New South Wales fossils, coming 
within the scope of the present work, have already appeared, by Messju, 
Morris and Lonsdale, M‘Coy, Dana, and De Koninck, respectively. To tne 
late Prof. John Morris and William Lonsdale belongs the honour of first 
systematically describing the Permo-Carboniferous and Coal-Measure fossils 
of New South Wales — those collected by the veteran explorer of Tasmania 
and Gippsland, Count Paul E. de Strzelecki, &c., who in 1S45 published his 
“Physical Description of N. S. Wales,”^ a work which may be described as 
the stepping-stone to Australian Geology. Prof. M‘Coy’s Memoir, published 
in the year 1847,^ was a description of the earliest collections of the late 
llev. W. B. Clarke, M.A., P.R.S., and generally bore out in a marked degree 
the conclusions arrived at by Morris. The third collection described was that 
made by the venerable Prof. James Dwight Dana, when acting as Naturalist 
and Geologist to the United States Exploring Expedition under Commander 
Charles Wilkes, U.S.N., between the years 1838-1842. The fossils in 
question are described in the magnificent volume of the expeditionary series 
devoted to its geological results.® The last series of organic remains 
referred to were described by the late Prof. Guillaume Laurient de Koninck, 
M.D., &c., in the “Memoiresde 1’ Academic Boyale de Belgique”®; and again 
' Geology of the Maitland District, with special reference to the Coal-Measures, 4to. (in preparation). 
^ “ The Invertebrate Fauna of the Hawkesbury-Wianainatta Series, &c.,” pp. 21, 2 plates, Mem. Geol. 
Survey, N. S. Wales, Pal. Series, No. 1, (4to. Sydney, 1888). By R. Etheridge, jun. 
2 Physical Description of New South Wales and Van Diemen’s Land, accompanied by a Geological map, 
sections, and diagrams, and Figures of the Organic Remains, pp. 4G2, plates, &c. (8vo. London, 1845). By P. 
E. de Strzelecki. 
^ “ On the Fossil Botany and Zoology of the Rocks associated with the Coal of Australia,” Ann. Mag. Nat. 
Hist., 1847, XX, pp. 145-157, 226-2.36, 298-312, Pis. 9-17. 
® United States Exploring Expedition during the years 1838, 1839, 1840, 1841, 1842, under the Command of 
('harles Wilkes, U..S.N., Vol. X, Geology, by J. D. Dana, jip. 756, Atlas, Pis. 21 (4to. and folio, Philadelphia, 1849.) 
® “Recherches sur les Fossiles pakozoiques de la Nouvelles Galles du Sud (Australie),” pp. 373 and Atlas. 
M4m. Acad. R. Belgique (8vo. and 4to., Bruxelles, 1876-77). 
