visible under hand-lens and of the order of intensity typical of Strioturbonilla amongst Turbonillids. Body-whorl half height of shell, high, evenly convex throughout in one broad sweep, the periphery much more widely rounded than usual in Odostomia, and the base long and slowly retreating to axis of shell; aperture narrowly subovate, sharply angled behind, rounded (not widely) in front; columella set vertically, distinctly arcuate, a broad low swelling just below its insertion; inner lip long, apparently not callused; outer lip thin, straight. Height, 4·5 mm; width, 1·5 mm. (holotype). Localities:—Orewa Beach, 20 miles north of Auckland (type); Takapuna Beach, Auckland; Oneroa, Waiheke Island. Type in writer's collection. The general build of this species, especially its long body-whorl of evenly convex outline, and its channelled suture, and the long narrow aperture with ill-differentiated plait, are important separative features. Striodostomia waikaia n.sp. (Fig. 15.) Shell of moderate size, considerably elevated, narrow. Apex and earlier post-nuclear whorls decollated, only the last three whorls remaining. Height of whorl greater than width, lightly and evenly convex, closely tabulated (almost channelled) at summits; suture distinct and greatly impressed. Spiral sculpture of faint microscopic striae, visible only in a good light here and there. Body-whorl long, flatly convex above; periphery low and bulging; base full, convex; aperture filled with hard matrix, fairly narrowly subovate, angled behind, rounded in front; columella set vertically, arcuate, its fold not in evidence; outer lip broken back; inner lip narrowly and lightly callused. Dimensions of body-whorl: height, 3·1 mm.; width, 2·6 mm. Locality: Waikaia (Ototaran). Type (unique) in Auckland Museum (ex Finlay collection). Waikaia can be distinguished from orewa by its weaker plait, higher and narrower body-whorl, and much fainter spirals. Striodostomia kaawa n.sp. (Fig. 14) Shell quite small, elevated, height of spire over twice that of aperture, outlines of spire lightly convex. Post-nuclear whorls five in number, flattish, cut in to suture; suture distinct, slightly channelled. Protoconch small, heterostrophic, typical of the genus. Spiral sculpture similar to that of the genotype. Height of body-whorl less than one-third that of shell, periphery low down. Aperture rather narrow; columella short, very arcuate, with a strong fold at insertion; inner lip thin, sharp, very faintly convex. Height, 2·8 mm.; width, 0·9 mm. Locality: Kaawa Creek (Waitotaran). Type in writer's collection. Distinguishable by much smaller size and distinct fold on columella. This is the species referred to as “n.gen. B n.sp.” in the list of Pyramidellids from Kaawa Creek (Trans. Roy. Soc. N.Z., vol. 66, p. 112, 1937). Very much better material has since been collected.