I INTRODUCTO RY R E MARKS. 
About four years ago we were favoured with the request by Mr. Edward 
E. Pittman, A.R.S.M., Government Geologist of New South Wales, and 
Prof. T. W. Edgeworth David, B.A., E.R.S., to undertake the investigation 
of the fossiliferous limestones of Poholhin and other localities in New 
South Wales, with a view to describing their foraminiferal contents. To 
this request we acceded, and in the prosecution of the work we Avere 
kindly assisted hy Prof. David, who sent us a collection of thirty-three thin 
sections of the Pokolbin foraminiferal rock, and also some typical specimens 
of the Pokolbin limestone for the purpose of slicing, as Avell as some 
decomposed material for washing, in order to separate any specimens which 
might perchance have broken free from the matrix. 
The disintegrated material first sent to us, when washed, yielded very 
little in the Avay of isolated foraminiferal tests ; but within the last year or 
so, Professor David and Mr. W. S. Dun, of the Department of Mines, Sydney, 
have kindly made further efforts to secure suitable material for this purpose. 
Some of the samples from Pokolbin and Wollong sent us by the above- 
mentioned gentlemen, have afforded us a fair number of highly interesting 
forms. These have been of great value in correcting our determinations of 
the Eoraminifera seen in the thin slices of the limestone. 
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