CENSUS OF FORAMINIFERA. 349 



Many years ago small samples of material from the Lower Tertiaries 

 were examined for foraminifera by the Rev. Tenison Woods, 

 Messrs. Parker and Jones, and Dr. H. B. Brady, particulars of 

 which will he found in the sequel. About ten years ago the 

 author commenced a systematic examination of the microzoal 

 Tocks of this continent, with the result that the list of kno-wn 

 species of foraminifera in the fossil condition has been greatly 

 increased and many interesting facts bearing upon the distribution 

 of this order in relation to space and time have been collated. 



The Held of investigation in this department of research is a very 

 wide one, and the methods of observation, demanded by the 

 minuteness of the objects, necessarily slow and tedious. Added to 

 these difficulties is the serious disadvantage of being widely 

 separated from co-workers in the same departments of study and 

 the inaccessibility to works of reference, which is one of the 

 greatest drawbacks to original workers in these colonies. I have 

 to express my grateful acknowledgments to the late Dr. H. B. 

 Brady, F.R.S., Monsieur C. Schlumberger (of Paris), C. D, 

 Sherborn, Esq., F.G.S., F. Chapman, Esq., and others for valuable 

 assistance given in the determination of new and doubtful forms ; 

 also to Professor R. Tate, F.G S., Jas. W. Jones, Esq. (Conservator 

 of Water), John Dennant. Esq., F.G.S., R. Etheridge, jun., Esq. 

 (Government Palajontologist, New South Wales), H. P. Woodward, 

 Esq., F.G.S. (Government Geologist, Western Australia), and many 

 others who have placed geological material at my disposal. 



The classification and nomenclature adopted in the present paper 

 are in the main the same as those laid down by Dr. H. B. Brady, 

 in his descriptions of " The Reticularian Rhizopoda of the 

 Challenger Expedition," modified only in a few instances where 

 later researches demand it. 



The letters in the columns indicate the relative number of 

 individuals observed whilst searching the material, and have the 

 following values : — V R, very rare ; R, rare ; R S, rather scarce ;' 

 M C, moderately common ; C, common ; Y C, very comm.on ; X, 

 indicates occurrences when the relative numbers of the species is 

 ■unknown. 



POST-TERTIARY. 



Material obtained from elevated sea bed bordering the coast. 

 The Post-Tertiary beds at Port Adelaide are divided into two 

 strongly- marked divisions — an upper bed of bluish sandy clay 

 Avith shells, and a lower bed of white calcareous sand very full of 

 organic remains. The foraminifera specified below were obtained 

 from the upper bed exposed in the banks of creeks on the Port 

 Adelaide flats. The lower bed has not yet been examined for 

 foraminifera, but large numbers of Orbitolites complanata^ Lamk., 

 can be easily distinguished in it by the naked eye. 



