NEWTON : OPALIZED SHELLS OF NEW SOUTH WALES. 235 



FIG. CORBICULA CORRUGATA, Tate, sp. 



15. Left lateral aspect, exhibiting well-marked dorsal slopes and equidistant 



concentric growth-bands. The opalescent characters of this specimen 

 are particularly fine. 



16. Dorsal view of same. 



Loc. White Cliffs. British Museum (Min. Dept., 76806). 



CYRENOPSIS (?) ELONGATA, n.sp. 



17. Left lateral view, showing subtrigonal contour and the short vertical 



striations crossing the concentric growth-lines. 



18. Ventral aspect of same, exhibiting considerable anterior convexity. 

 Loc. White Cliffs. Eev. F. St. J. Thackeray Coll. 



Maccoyella barklyi, Moore, sp. 



19. External aspect of a left valve displaying the equidistant radial costae 



crossing the closely arranged concentric striations. 

 Loc. White Cliffs. British Museum (Geol. Dept., L. 21272). 



EUSPIRA VARLABiLis, Moore, sp. 



20. Front aspect, showing small elongate perforation and ovate aperture. 



22. Summit surface of same specimen, containing sculpture ridges on the 



penultimate whorl. 

 Loc. White Cliffs. British Museum (Min. Dept., tWr)- 



21. Front view of a larger example which has been polished by the lapidary. 

 Loc. White Cliffs. British Museum (Geol. Dept., G. 19602). 



23. Sculpture striations, magnified, as seen on well-preserved test of another 



specimen. 

 Loc. White Cliff's. Kev. F. St. J. Thackeray Coll. 



