Hurron—7ke Plocene Mollusca of New Zealand. 57 
Genus ACLIS. 
Actus costeLLaTa, Hutton, Trans. N.Z. Inst. Vol. XVII. p. 319. 
(Plate vir. fig. 47.) 
Shell minute, subulate. Whorls 6, rounded, the first two smooth and 
polished, the rest spirally grooved. Whorls with the two posterior spiral grooves 
deeper and broader than the others, and the rib between them higher ; crossed 
by delicate longitudinal plications ; base of the body whorl very finely spirally 
grooved. Suture well marked. Aperture ovate, less than half the length of 
the shell ; columella arched ; umbilicus covered. Length 3mm. 
Locahity.—W anganui. 
Genus ODOSTOMIA. 
Key to the species. 
Whorls longitudinally plicated (Parthenta)  ... .. O. rugata. 
Whorls spirally grooved (Pyrvamis) — ... ane ron On fasccata: 
Whorls not ornamented. 
Shell not polished... os ie sae ma Odaeted: 
,, polished, whorls 10. ... Sas af . O. georgiana. 
fs 3 4 IW Wee Baik ee -. O. sheroffit. 
Opostomia Lacrna, Angas, Pro. Zool. Soc. 1867, p. 112, pl. xm. fig. 11 (not of Linn.) 
(Plate vit. fig. 48.) 
Locality.—Wanganui, Petane, Matapiro. 
Opostomia GEorGIANA, Hutton, Trans. N.Z. Inst. Vol. XVII. p. 319. 
(Plate vir. fig. 49.) 
Shell rather elongated, polished. Whorls 10, flattened, irregularly longitu- 
dinally marked, but not plicated; body whorl very obtusely keeled. Suture 
impressed. Aperture oval, pointed behind; columella with a single deep, 
posterior, oblique fold, nearly or quite covering the umbilicus. Length 15mm. 
Locality.—W anganui, Petane. 
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