Hurron—TZkhe Pliocene Mollusca of New Zealand. 71 
Genus MONODONTA. 
Key to the species. 
Whorls with distant spiral groove... ae ... MW. aethiops. 
A smooth, or with smooth spiral ribs ... ... MW. melanoloma. 
2 with three strong nodulose spiral ribs . MM. lugubris. 
Monoponta zTHI0PS, Gmelin; Zvochus zealandicus, Quoy and Gaimard, l.c. ILI. p. 257, 
pl. txiv. figs. 12-15. 
Locality.—W anganul. 
Mownoponta meLANotoma, Menke, Moll. Nove Hollandiz, No. 50, p. 14. 
Locahty.—Wanganui. 
Monoponta Lucusris, Gmel.; Zvochus congulatus, Quoy and Gaimard, l.c. IIT. p. 259, 
pl. txiv. figs. 16-20. 
Locality.—W anganui. 
Genus CYCLOSTREMA. 
CycLostreMA oBLiquata, Hutton, Trans. N.Z. Inst. Vol. XVIII. p. 335. 
Shell large, spiral, depressed, smooth (?), with a spiral groove above the 
periphery. Whorls 4, increasing rather rapidly. Suture deep. Umbilicus 
wide, Aperture oval, very oblique; peristome continuous, sharp. Greatest 
diameter 20mim.; least diameter 16mm.; height 16mm. 
Locality.—Wanganui. A single specimen. 
Genus SCISSURELLA. 
ScissuRELLA MANTELLI, Woodward, Pro. Zool. Soc. 1859, p. 202, pl. xiv1.; Tryon, 
le. XII. pl. ivi. fig. 12. 
Locality.—Petane. 
