spirally furrowed in region of columella; aperture subovate, drawn down and inwards towards axis of shell; columella set vertically, arcuate, its fold below insertion, strong and prominent; basal lip a little expanded; inner lip callused; outer lip broken back. Height, 9·0 mm.; width, 3·5 mm. (holotype). Locality: Blue Cliffs, Otaio River, South Canterbury (Hutchinsonian). Type in writer's collection. A. alexanderi has not the concave outline to spire, which is not so sharpened posteriorly, and possesses whorls rather more convex and narrowly tabulated at summits, so that the spire is somewhat staged and the sutures much more distinct. A. pittensis is a smaller and stouter species with heavy and less exsert protoconch, stronger and more regular growth-lines, and with spire, shape of whorl and suture similar to those of alexanderi. With the exception of the protoconch, similar characters separate georgiana from this Blue Cliffs species. Genus Evelynella nov. Type: Evelynella venustas n.sp. Herein are placed Odostomia-like shells having lirations on the internal side of the outer lip and an embryo of helicoid coiling. In New Zealand the group is not represented in the Recent fauna, but is conspicuous in the Upper Oligocene (Hutchinsonian) and in the Lower Miocene (Awamoan). Two species occur in the Lower Pliocene beds at Kaawa Creek (Waitotaran). There is a peculiar look about these shells due to the form of the body-whorl and aperture (particularly the rather disproportionate width of the former), which frequently enables one to pick this genus before inspecting the lip for lirations. Evelynella venustas n.sp. (Fig. 19.) Shell very small, conic, of about 4 ½ post-nuclear volutions, last whorl disproportionately swollen and less than one-half height of shell; outlines of spire straight to very lightly convex. Whorls very flatly and evenly convex, not or only very slightly shouldered; suture moderately impressed. Protoconch heterostrophic, of about 1 ½ volutions coiled in a helicoid spiral; nucleus one-half immersed. Sculpture of one incised spiral line a little posterior to suture and passing out over periphery of body-whorl and marking a slight angulation on whorls; growth-lines microscopic and densely packed together. Body-whorl of adults disproportionately inflated, the angulation practically absent; periphery broadly and evenly rounded; base convex. Aperture pyriform; columella vertical, arcuate, its plait posterior, pronounced, horizontal; umbilical chink present in some specimens; outer lip thin, straight, with a number of lirations some distance within. Height, 3·1 mm.; width, 1·2 mm. (holotype). Localities:—North Otago Awamoan horizons: shell-bed. Target Gully, Oamaru; Awamoa Creek, Oamaru; Pukeuri, near Oamaru. South Canterbury Awamoan horizons: White Rock River; Sutherlands, Tengawai River; Opihi River, three miles above its confluence with Tengawai River; Holme Station, Pareora Gorge. Also from