Notosetia prisca n. sp. (Fig. 9.) Shell minute, ovate, body-whorl large in proportion to rest of shell. Sculpture of faint growth-lines; at somewhat regular distances some appear more prominent, but are not raised; a faint furrow emerges from suture on body-whorl and marks periphery. Spire very little higher than aperture. Protoconch of 1·½ smooth and polished whorls, marked off by a groove from whorls proper, of which there are 3, lightly convex, body-whorl very slightly subangled for a short distance in front of suture, which is deep and channelled. Aperture oval, oblique, angled above. Peristome discontinuous, outer lip with prominent varix behind, but sharp edge; slightly effuse basally, and angulated medially. Columella short, arcuate, rounded. Inner lip distinctly callous but not covering the narrow elongated umbilical chink. Height, 1·5 mm.; diameter, 0·9 mm.; height of aperture, 0·7 mm. Type and several paratypes, from Pourakino, Riverton (Awamoan ?), in the author's collection. Very close to N. vulgaris (Webster); separable only by its consistently smaller size and more tightly clasping spire-whorls. The Recent species has not been found fossil, and it is curious to find a form so closely similar in beds of at least Awamoan age. The outer lip of the holotype is rather more rounded than in the other specimens, most of which have a prominent angulation at about the middle. The holotype, too, on account of its fine preservation, is almost the only specimen that shows the axial markings and median furrow. Subsp. paroeca n. subsp. Differs from the species only in slightly higher spire and more regularly curved outer lip, which slants downwards from suture without any medial angulation. Both adult specimens show these differences, but otherwise are so like N. prisca that full specific rank does not seem justified. Height, 1·4 mm.; diameter, 0·8 mm.; height of aperture, 0·6 mm. Type and two paratypes, from Clifden, Southland (bands 6A and 6C Ototaran ?), in the author's collection. Notosetia sp. In the author's collection is a single worn specimen of a species from the Kakanui tuffs which somewhat resembles N. micans (Webster). Apart from the foregoing species, it is the only one of this genus yet known from pre-Pliocene beds in New Zealand; it is certainly new, but description is withheld till better specimens are obtained. Notosetia sp. cf. subflavescens Iredale. Rissoa atomus Suter; not of Smith (Iredale, 1915). Specimens of a shell very close to, if not identical with, this species are not uncommon at Castlecliff; they are rather variable, the body-whorl being often subangled with traces of microscopic spirals on some specimens. They agree with the diagnosis in every point except that of translucent test; opacity may be due to fossilization, but in the absence of authentic specimens of the Recent form identification is deferred. Notosetia is the most difficult and unsatisfactory genus in the New Zealand Rissoidae. The name Notosetia pupa nov. is suggested in place of Rissoa lubrica Suter, 1898; preoccupied by R. lubrica Verrill, 1885.