PREFACE, — 
and the date, then follow within brackets one or more references 
to descriptions of the genus in question, by its author or other 
writers as the case may be; but it is to be universally under- 
stood that the first reference after a genus is that of its original 
description or enunciation, so far as my own researches have 
enabled me to ascertain. Here and there a few synonyms 
are given, and always the order or family to which the genus 
belongs. 
The references to the species are of two kinds; first, those 
to works in which a detailed description or figure is to be 
found, denoted by an * placed before them; secondly, those 
in which a passing reference only is made to the species, such 
for instance as the announcement of the first discovery of it 
in Australian rocks, or of a new locality. When a species is 
common both to the strata of Australia and those of any other 
country I have invariably given quotations showing its syn- 
onymy and history previous to its discovery in the former. 
Unless denoted by the sign ! placed after it, every reference 
has been personally verified and referred to; any errors there- 
fore which may be found are my own, and have arisen during 
transcription, or are typographical. 
The abbreviations used are those usually adopted in works 
of reference, but in case they should not at once be apparent 
to the reader, I have given a list of all the Works, Papers, 
and Reports used and consulted in the compilation, arranged 
alphabetically under the authors’ names, so that the full title of 
almost every quotation can at once be seen. 
In the locality column the respective Colonies in which 
the places mentioned are situated, are indicated by an ab- 
breviation in italics: thus, V. S. Wales (= New South Wales), 
Vict. (= Victoria, formerly Australia Felix), S A. (=South 
Australia), W. A. (= Western Australia), Qu. (= Queensland), 
Tas. (= Tasmania). 
It affords me great pleasure to offer my sincere thanks 
to those gentlemen who have rendered me assistance. To the 
father of Australian Geology, the late Rev. W. B. Clarke, F.R.S., 
I am indebted for information on many points connected with 
Colonial Geology, and the general interest he took in my work, 
Similarly, I am under obligations to Messrs R, B. Smyth and 
'N. Taylor (Melbourne), C. S. Wilkinson (Sydney), R. M. John- 
