437 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 33
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