LOWER CRETACEOUS FOSSILS from the SOURCES of 



the BARCOO, WARD and NIVE RIVERS SOUTH 



CENTRAL QUEENSLAND 



Part II. 1 — Cephalopoda. 



By R. Etheridoe, Junr., Curator. 



(Plates xxx.-xlix., and Fig. 8.) 



I. — Introduction. 



The "Ammonites" proper contained in Mr. H. W. Blomfield's 

 collection are few in number, and will l>e noticed in a later part of 

 this Memoir. The following descriptions of the " Crioceri " are 

 offered with a considerable amount of diffidence, and to arrive at 

 these results I found it imperative to undertake a general review 

 of our Cretaceous forms hitherto associated with the names 

 Crioceras and Ancyloceras; the outcome of this work, extending 

 over many months, is to my mind, I regret to say, anything but 

 satisfactory. This arises from two primary causes, the frag- 

 mentary state in which the fossils are frequently found, ami the 

 difficulty experienced in grouping such portions, from many and 

 widely separated localities, in well defined species. A secondary 

 cause is due to the fact that many of the hitherto described tonus 

 are based on portions of shells onlv, and in two instances at least 

 the descriptions are so inadequate that recognition of the species 

 is practically reduced to guess work. In no instance is this more 

 apparent than in that of Cr iocer as austral e, Moore, the Australian 

 type of the group. 



To render my investigations as complete as possible, I assembled 

 all the specimens of the above two genera within my reach, and 

 drew upon the following collections, as well as our own : — The 

 Mining and Geological, and Macleay Museums, S} 7 dney; National 

 Museum, Melbourne : Geological Survey, and Queensland 

 Museums, Brisbane ; Geological Survey Collection, Adelaide ; and 

 the Sweet Collection, Melbourne. For the loan of specimens from 



1 Part i.— See Austr. Mus. Rec vi., 5, 1907, p. 317. 

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