333 



apex small, oblique, circiriately coiled ; bocly-whorl regularly 

 flatly convex, concentrically lamellose-riclo'ed ; septum with a 

 concave edge. 



Dimensions. — Diameters, 27 and 25; height, 11. 



Localities. — Miocene : Gippsland Lakes (common) ! ; Hallett's 

 Cove ! . 



Differs from C. unduJata, by its less excentric apex and less 

 ventricose whorls. 



Subgenus Calyptropis, Tate. 



Ref.—^voc. Roy. Soc, N.S. Wales, vol. XXVII., p. 181, 1893. 

 " Shell like CaljUraea, but umbilicated, and with a columella- 

 insinuosity at the uml)ilical border. 



6. Calyptropsis araehnoideus, ^pec. nor. Pi. vii., fig. 9. 



Shell thin, orbicular in basal outline ; spire depressed, apex 

 submarginal, of rapidly increasing, ventricose whorls ; surface 

 ornamented with acute raised concentric threads and distant 

 similar spiral threads ; the interspaces with close, raised strite ; 

 septum slightly ecurved medially, slightly concave, faintly radiately 

 ridged. 



Dimensions. — ^Diameters, 12*5 and 10*5 ; height, 4 •25. 



Localities. — Eocene : Aldinga Cliffs and Adelaide-bore (very 

 rare. 



7. Calyptropsis turbinata, Teii.-Woo(U. 



Trochita turbinata, Ten. -Woods, Proc. Lin. Soc, N.S. Wales, 

 vol IIL, p. 238, pi. 21, fig. 1, 1879. 



Shell thin, suborbicular in basal outline, turbinately depressed ; 

 wdiorls two and a-half, rapidly increasing, somewhat flattened 

 posteriorly, apex exsert; surface slightly corrugated concentrically, 

 and coincidently finely lined ; spirally distantly lined, faintly 

 ridged on posterior area of body-whorl ; septum deeply sunk, 

 radiately sulcate ; umbilicus narrow. 



Dimensions. — Diameters, 11 and 10; height, 4*5. 



Localities. — Eocene: Muddy Creek (lenison-Woods .') : Bird- 

 rock Bluff, near Geelong !. 



8. Calyptropsis umbilieata, John-^ton. 



Crepidula umhilicata, R. M. Johnston, Proc. Koy. Soc. Tas- 

 mania for 1884, p. 232 (two figs.), 1885 : id., " Geol. Tasmania, 

 t. 32, fig. 10, 1888. 



Shell rather thin, oval in basal outline ; body-whorl depressed, 

 flatly convex, more rapidly sloping from the periphery to the 

 margins ; apex posterior, oblique, submarginal, slightly elevated ; 

 whorls two and a-half of very rapid increase ; surface somewhat 

 rugose with a few distant spiral ridges crossed by lamellae of 



