Tertiary.) PALZONTOLOGY OF VICTORIA. [ Mollusca. 
projection at each end of the shell, as well as the strong reflexion of 
the channels, also induce me to place the present fossil in Cyprea. 
The fine specimen figured was found by a shepherd of Angus 
Cameron, Esq., and was presented by Lindsay Clarke, Esq. 
In blue Oligocene clay of Muddy Creek, ten miles south of 
Hamilton. Rare in Oligocene clay of Mornington, near Mount 
Eliza. 
EXPLANATION OF FIGURES. 
Plate XV.—Dorsal view, natural size. Plate XVI.—Fig. 2, end view of same specimen, 
natural size. Plates XVII. and X VIII.—Fig. 1, side view, natural size. 
Prate XVI., Fra. 1; Puates XVII. anp XVIII., Fie. 2. 
CYPRAA (ARICIA) GASTROPLAX (McCoy). 
Drscripr1on.—Ovate; back very gibbous, moderately attenuated in front, 
rounded posteriorly. Spire small, blunt, of two volutions; aperture narrow, arched, 
set with large prominent teeth on each side. Base flattened and dilated from each 
side into a very large flat thin circular disc, with a semi-cylindrical channel in front 
and behind, not extending beyond the circular outline of the ventral disc. Whole 
surface highly polished; one or two faint concentric undulations, and more numerous 
faint radiating ones on the gastric disc. Length and width of the ventral disc, 4 
inches 8 lines; greatest width of body whorl (without disc), 2 inches; length of body 
whorl, 25 inches ; height, 1 inch 6 lines; diameter of spiral suture, 5 lines; thickness 
of flange, about 14 to 2 lines. 
The enormously extended circular thin flange into which the 
base is extended renders this cowry totally unlike any previously 
known living or fossil species. 
Rather rare in the Oligocene Tertiary limestone of the tract 
between Mount Eliza and Mount Martha, on the shores of Hobson’s 
Bay. 
EXPLANATION OF FIGURES. 
Plate XVI.—Fig. 1, profile view, natural size, showing the elevation of the back and form 
of the anterior and posterior canals. Fig. 1a, oblique end view, showing the spire, posterior canal, 
and extension of gastric plate. Plates XVII. and X VIJI.—Fig. 2, view of under side, showing 
circular outline of gastric disc, posterior canal, with the form of the aperture and outer and 
inner teeth. Fig. 2a, dorsal view of same specimen, All the figures natural size. 
Freperick McCoy. 
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