Evelynella doliella n.sp. (Fig. 13.) Shell small, conic, of 5 ½ post-nuclear whorls, spire three times height of aperture, its outlines convex. Whorls flat, margined by a swollen band behind, causing spire to appear staged. Protoconch heterostrophic, helicoid; nucleus about one-half hidden in first adult volution. Sculpture of two microscopic incised spiral lines, one immediately anterior to swollen subsutural margin, the other slightly posterior to suture; growth-lines microscopic, densely packed together. Body-whorl not long, sub-angled, flat above periphery; base lightly convex. Aperture rhomboidal, broadly rounded in front, angled behind; columella set vertically, considerably arcuate; columella-fold posterior, prominent, horizontal; outer lip thin, straight, a number of lirations within. Height, 4·0 mm.; width, 1·5 mm. (holotype). Locality:—Clifden, Southland, band 6C and left side of Waiau River, bed C = base of band 7 on right side (type). Hutchinsonian. Type in Auckland Museum (ex writer's collection). Distinct from marginalis in having a higher and staged spire, whorls tumid posteriorly, angulated body-whorl and weaker plait. Evelynella kaawa n.sp. (Fig. 12.) Shell small, stumpy, of 4 ½ post-nuclear whorls, height of spire about 1 ¾ times that of aperture, its outlines straight to lightly convex. Whorls flat; suture narrowly but distinctly cut in. Protoconch of low helicoid coiling, its lateral nucleus a little less than one-half immersed. Subsutural border very lightly swollen; suture margined on each side by an incised spiral line; growth-lines straight, vertical. Height of body-whorl slightly over one-half that of shell; periphery sub-angled; base lightly convex. Aperture pyriform; columella fairly heavy, arcuate, set vertically; plait strong, situated slightly below insertion; inner lip turned in to suture at posterior of aperture; lirations weak, four or five in number, situated some distance in from edge of lip. Height, 2·5 mm.; width, 1·3 mm. Locality: Kaawa Creek (Waitotaran). Type in writer's collection. Nearest to E. doliella, but has border less swollen and is less attenuate. Genus Obex nov. Type: Odostomia denselirata Suter. This name has been provided for Odostomia denselirata Suter and a new species from Kaawa Creek, which are distinct from all other Odostomids in that their spiral sculpture consists of dense, regular, microscopic, distinctly raised threads (not striae) over the whole surface of the shell. The protoconch is heterostrophic and of low helicoid coiling.