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. 11
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