144 RECORDS OF THE AUSTRALIAN MUSEUM. 



zone absent ; flanks so very little rounded as to appear almost 

 Hat; section longitudinally and obtusely triangular (or longi- 

 tudinally deltoid). Cost* single, obtuse, broadening forwards, 

 straight on the venter, curved slightly forwards on the dorsum, 

 and simply oblique, or very slightly sigmoidal on the Hanks ; 

 intercostal valleys delicately lined to correspond with the costse. 



Obs. — Three disunited portions of whorls are referred to 

 under this name, two of which may belong to the same individual 

 specimen. Three characters combined serve to distinguish these, 

 viz., the narrow venter, comparatively flat flanks, and the absence 

 of tubercles. In the second of these features there is a general 

 agreement with C. axonoitles, but the tubercles of the hitter are 

 wanting. The three specimens are to some extent exfoliated, but 

 I hardly think this would have obliterated all trace of tubercles, 

 had the latter ever existed. The cost* agree with those of the 

 median and older conditions of C jackii. The flat, or almost 

 straight- walled flanks assist materially in giving rise to the 

 longitudinally deltoid outline of the transverse section of the 

 walls, which is entirely unlike that of C. jackii. Pending the 

 acquisition of more perfect material, the claim of these disunited 

 portions to specific rank can only be regarded as tentative. 



Loc. — Liud River, a branch of the Mitchell River, Cape York 

 Peninsula [G.S.Q.; and A.M. (IF. Cope)].- 7 » 



Criocekas, sp. 



(Plate xxxviii., figs. 1, 2.) 



Obs. — This fragment is figured for future reference. It consists 

 of portion of one whorl only, long-oval in transverse section, with 

 a narrow rounded venter, a flat dorsum, exhibiting hardly any 

 trace of an impressed zone, and absolutely flat flanks. The costa? 

 are obtuse (although not large), particularly on the venter, which 

 they cross without i curvature, but on the dorsum are faintly 

 inflected forwards, whilst on the flanks these ribs are slightly 



' 27 Xf7rr6j, thin. 



- 7a The abbreviations used in this and following localities are as follows:— 

 A.M. = Australian Museum Collection, Sydney. 

 Q.M. =Queensland Museum Collection, Brisbane. 

 G.S.Q. —Geological Survey of Queensland Collection, Brisbane. 

 <..S.=»G. Sweet Collection, Melbourne. 

 U.S.---- Macleay Museum, University of Sydney. 

 M.G.M. Mining and Geological Museum, Sydney. 

 X.M.M. — National Museum, Melbourne. 

 G.S.S.A.=Geological Survey S. Australia Collection, Adelaide. 



