284 Transactions of the South African Philosophical Society. 



Mr. Walcot Gibson, of the Geological Survey of England, and Mr. 

 J. V. Zelizko, of the Kaiserlich-Konigliche Geologische Keichsanstalt, 

 Vienna, have very kindly given their services, and it is almost impossible 

 to say how much this catalogue owes to them for the time which they 

 have spent, and the immense pains which they have taken in verifying 

 references and in adding to the number of them. 



To the compilers of the earlier book-lists and bibliographies, and to 

 the custodians of the libraries which I have been allowed to use, my 

 thanks are also due. 



The abbreviations used are, in most cases, those adopted for the 

 International Catalogue of Scientific Literature. 



M. WILMAN. 



Cape Town, 



December, 1904. 



