Hurron—7he Plhocene Mollusca of New Zealand. 65 
15 ina whorl. Spirals—a posterior one near the angle and two anterior ones 
with a smooth band between them. On the body whorl about 7 spirals in front 
of the smooth band, and the longitudinals become obsolete. Suture impressed. 
Aperture roundly ovate, peritreme continuous. Length 3mm, 
Localty.—Wanganui, Petane. 
Rissoa Rucosa, Hutton, Trans. N.Z. Inst. Vol. XVII. p. 321. 
(Plate vin. fig. 66.) 
fo) 
Shell robust, pupiform, roughish. Whorls 6 or 7, the first 14 polished, the 
others of the spire longitudinally plicated, with one spiral rib and a sulcus behind, 
and two in front of the plications ; plications more or less nodulose. Body 
whorl sometimes not longitudinally plicated, the posterior half with about 8 
spiral ribs, the anterior half smooth. Aperture broadly ovate, the peritreme 
continuous and rather patulous. Length 4mm. 
Localty.—Petane. 
Rissoa annutata, Hutton, N.Z. Journal of Science, Vol. II. p. 173. 
(Plate vit. fig. 67.) 
Shell minute, ovate, smooth. Whorls 5, slightly rounded, the suture well 
marked. Aperture rounded, the peritreme continuous in the adult. Length 
2mm. 
Locahty.—Wanganui, Petane. 
This is really a Azssozza, but, as the operculum is never preserved, it is 
better to consider it here as a species of Azssoa. 
Rissoa EMARGINATA, Hutton, Trans. N.Z. Inst. Vol. XVII. p. 320. 
(Plate vim. fig. 68.) 
Shell minute, ovato-conical, smooth, polished, very delicately spirally striated. 
Whorls 6, flattened, the two first very small and smooth. Suture obscure. 
Aperture ovate, the peritreme continuous; slightly notched anteriorly. Length 
2mm. 
Locality.—Wanganui, Petane. 
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