Tertiary. | PALZONTOLOGY OF VICTORIA. [ Mollusca. 
the little bounding ridges or wrinkles being destitute of all order 
in some specimens, but showing indistinct transverse ridges towards 
the posterior end in others. The form is more globular than any 
of the allied Cypree of the Australian Tertiary rocks. In young 
individuals the canals are still shorter, the spire more prominent, and 
the teeth fewer in number. In some old specimens the thickening 
of the base leaves a definite thickened marginal boundary from the 
surface of the sides. 
The species is not nearly allied to any living or extinct form 
with which I am acquainted. 
Abundant in the bluish Oligocene Tertiary clays and limestones 
of Mornington, near the foot ae Mount Eliza and Mount Martha. 
EXPLANATION OF FIGURES. 
Plate XLIX.—Fig. 3, side view of average specimen, natural size. Fig. 3a, dorsal view of 
same specimen. Fig. 36, basal view of same specimen. Fig. 3c, posterior end view of same 
specimen. Fig. 3d, magnified view of portion of surface. Fig. 4, dorsal view of younger speci- 
men, natural size, showing shorter canals. Fig. 4a, basal view of same specimen showing 
fewer teeth. 
Freperick McCoy. 
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