PREFACE. vii 



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, iV. 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- 



