Tertiary.'] PALEONTOLOGY OF VICTOEIA. IMollusca. 



Fragments have been found indicating a diameter of about 6 

 inches, but the majority of specimens found are under 2 inches. 



Not uncommon in the OHgocene Tertiary clays of Mornington, 

 near ]\Iount EHza and Mount Martha. In similar deposits at Point 

 Addis. In similar strata at A'" 9, 3 miles west of the mouth of the 

 Gelliljrand River. Common, of large size, at A* 22, in Miocene 

 junction beds at Bird-Rock Point, near mouth of Sjjring Creek, 

 15 miles S. of Geelong. Excessively rare in Lower Pliocene iron- 

 stones of Flemington, and equally rare in yellow sandy beds at 

 Mordialloc. 



Explanation op Figures. 



Plate XXIV. — Fig. 1, intei-nal cast showing chambers of only specimen found in the hard 

 ferruginous Lower Pliocene beds of Flemington, natural size. Fig. 2, small perfect specimen 

 from the lUigocene Tertiary beds near Mount Martha, natural size, front view of variety with 

 rather wider periphery than usual. Fig. 2a, side view of same specimen. Fig. 3, larger specimen 

 of ordinary compression of sides, from near mouth of Gellibrand Kiver ; the siphon is seen 

 toucliing the inner edge ; the two lateral pits are produced by the two lateral lobes of the septa. 

 Fig. 3a, side view of same specimen. Fig. 4, portion of larger specimen from Oligocene Tertiary 

 near Mount Martlia. Fig. 4a, front view of same specimen, showing with fractured edges of the 

 septa, the very large shelly funnel-shaped invaginated siphon, natural size. Fig. 5, still larger 

 specimen, natural size, from the Junction Miocene beds of Bird Rock, south of Geelong. 



Frederick McCoy, 



[22] 



