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THE CARBONIFEROUS TRTL0RTTE8 OF AUSTRALIA. 



By John Mitchell, late Principal, Technical College at 

 Newcastle, New South Wales. 



(Plates xlvi.-liii.) 



Introduction. 

 For many years, m\' collection has contained a number of 

 Carboniferous Trilobites new to science. When the opportunity 

 of describing tliem presented itself, my first intention was to 

 confine myself to these specimens. On subsequent consideration, 

 it occurred to me that palaeontoloi^ical knowledge would be 

 increased by extending the scope of my paper so as to embrace 

 all previous work on the Carboniferous Trilobita of Australia, 

 to describe all new forms that might be available from other 

 sources, and review, redescribe, and redetermine, where it might 

 seem necessary, those species referred to by previous authors. 

 It will be found, in the course of this paper, that, in a number 

 of instances, my views are widely divergent from those of pre- 

 vious authors; and, while regretting this divergence, it has not 

 arisen through rashness or want of reflection on my part; and I 

 may candidly affirm that my inability to reconcile the deter- 

 minations of previous authors with my own, in some cases, was 

 the only unpleasant part of the work expended on this paper. 

 My aim is to clear the literature on the Australian Carboniferous 

 Trilobita, to date, of errors which have undoubtedly become in- 

 corporated therein. This aim is one not likely to be fully 

 realised, but it will be my endeavour at least to lessen them, 

 and, if I succeed in doing this, I shall be satisfied. That the 

 present paper is free from errors is not one of my expectations, 

 for with reference to my conclusions in respect to F. woodivardi, 

 I am not by any means satisfied; and I shall await with some 

 anxiety, the discovery of better petrifactions of the remains of 

 this species, to make certain what its complete form actually 



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