30 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



angled above. Peristome continuous in adult specimens, thin on the 

 parietal wall, slightly thickened, sharp. Columella short, subvertical ; 

 the inner lip slightly expanded and giving rise to a narrow chink. 

 Operculum unknown. Diam. '9, height r6mm. ; diam. 1, height 

 1-5 mm. 



Hah. — Titahi Bay, Cook Strait ; found in sand (Miss M. Mestayer). 



The nearly allied R. rosea, Hutton, is larger, more solid, and 

 opaque, uniformly pink ; the outlines of the spire are straight, and the 

 whorls flat. Type in my collection. 



23. RissoA (Setia) atomus, n.sp. PI. II, Pig. 27. 



Shell minute, globular, rimate, smooth, translucent, polished. The 

 only sculpture consists of mici'oscopic growth-lines. Colour light 

 yellow. Spire short, with a blunt apex, very little higher than the 

 aperture ; outlines convex. Protoconch small, depressed, flatly convex. 

 Whorls 3, convex, rapidly increasing, the last volution occupying 

 about four- fifths of the whole height ; base rounded. Suture deep, 

 sometimes deeply channelled on approaching the mouth. Aperture 

 roundly ovate, angled above. Peristome continuous, very little callus, 

 edge rather blunt. Columella subvertical, slightly arcuate ; inner lip 

 a little reflexed, and producing an umbilical chink. Operculum un- 

 known. Diam. 1, height 1'25 mm. 



Hah. — Near the Bounty Islands, in 50 fathoms (Capt. BoUons). 



Nearly allied to R. micans, Webster, which, however, has 3J to 4 

 whorls and is much less globose, specimens from Hauraki Gulf 

 measuring 1"1 by 1"5 mm. Type in my collection. 



24. EissoA (Setia) vekecunda, n.sp. PI. II, Fig. 28. 



Shell minute, ovate, rimate, solid, slightly shining, smooth. There 

 is no sculpture except fine growth-lines. Colour very light horny ; 

 dead shells are cretaceous. Spire conical, very little higher than the 

 aperture ; outlines slightly convex. Protoconch small, papillate, of 

 one and half smooth and convex whorls. Whorls 4, the last high, 

 lightly rounded ; base convex. Suture impressed. Aperture oblique, 

 oval, angled above. Peristome continuous, thickened, with a blunt 

 edge. Columella short, arcuate ; inner lip slightly reflexed, forming 

 a narrow umbilical chink. Diam. 1-25, height 2 mm. 



Hah. — Near the Snares Islands, in 50 fathoms, type, and Queen 

 Charlotte Sound, in 16 fathoms (Captain Bollons). Type in my 

 collection. 



25. RissoA (Setia) poecellana, n.sp. PI. II, Fig. 29. 



Shell minute, ovate, rimate, smooth, translucent white, whorls faintly 

 shouldered. Sculpture consisting of fine growth-lines, crossed by a few 

 microscopic spiral striae upon the base. Colour white. Spire conical, 

 faintly gradate, one and a half times the height of the aperture ; out- 

 lines but little convex. Protoconch small, globose. Whorls 4^, convex, 

 slightly shouldered, the last large ; base rounded. Suture not deep. 

 Aperture ovately rotund, angled above. Peristome discontinuous, 

 rather sharp. Columella vertical, arcuate; inner lip not expanded. 



