early whorls periphery is apparently subangled, but becomes convex later; each whorl clasps the one above rather closely but leaves margining sutural cord prominent; these two facts render the suture subcanaliculate. Spire high, about twice height of aperture, outlines pupiform. Aperture ovate, laterally compressed, decidedly oblique. Outer lip broken, but apparently thin and sharp; peristome nearly continuous. Columella very oblique. Inner lip very slightly reflected, spread as a callus over columella and parietal wall. Height, 3·7 mm.; diameter, 1·4 mm.; height of aperture, 1·2 mm. Holotype, from Maraekakaho Creek (three miles above junction with Ngaruroro River, Geol. Surv. loc. 1102; horizon Nukumaruian), in the collection of the New Zealand Geological Survey. Collected by Mr. J. Marwick. Also one paratype from Nukumaru, in the author's collection, collected by Mr. R. S. Allan. Paratype reproduces sculpture of holotype exactly except that second-lowest rib on base is unduly accentuated, forming almost a blunt carina, and faint traces of longitudinal ribs are present. The species is related to E. semisulcata (Hutt.), but has far more numerous and more persistent spirals, and a taller and thinner shell; it is still closer to the following species, which, from Hutton's description seems to be well distinguished by its stronger axial ribs, relatively greater width, and lack of spiral ornament on base. Estea rugosa (Hutt.). Only one juvenile specimen of this species has been available for examination, so that it is not generically placed with absolute confidence, but the figure and description seem fairly definitely to indicate this genus. The species combines the types of sculpture shown by E. impessa (Hutt.) and E. polysulcata Finlay. Locality: Petane, Nukumaru. Estea impressa (Hutt.). Characterized by the stout sloping axial riblets on the lower whorls, the infrasutural groove, and the minute size of the shell. Related to such Australian forms as E. kerskawi Ten.-Woods. Localities: Castlecliff, Petane, Waikopiro, Nukumaru. The Recent E. minor (Sut.)—which Suter reduced to a variety of E. zosterophila (Webster), but which is certainly worthy of specific rank—is a totally unsculptured relative of this species. Estea semisulcata (Hutt.). Distinguished by having about 4 spiral cords, with linear interstices, on the last 1·½ whorls only; otherwise very similar to E. zosterophila (Webster), to which it bears somewhat the same relation as E. impressa does to E. minor. Localities: Castlecliff, Nukumaru. Estea zosterophila (Webster). Locality: Castlecliff (fide Suter, Man. Moll., p. 211). This record needs confirmation; it probably is based on a worn E. impressa (Hutt.).