I92 DISCOVERY REPORTS 



Genus Haurakiopsis, n.gen. 



Type : Haurakiopsis pellucida, n.sp. 



This genus is provided for shells of the general facies of Haurakia, having blunt 

 oblique axials, subsidiary spiral sculpture and a sutural thread, but with a distinctly 

 striated protoconch. A second species is Oliver's Kermadec Island H. kermadecensis 

 (1915, p. 518). Typical Haurakia have a smooth protoconch. 



Haurakiopsis pellucida, n.sp. (Plate LII, fig. 5). 



Shell minute, very thin, translucent, sculptured with distant short blunt oblique 

 axials which do not reach the sutures, and close microscopic spiral striae. Whorls five, 

 including a protoconch of 1^ whorls ; tip smooth, remaining whorl sculptured with four 

 fine but distinct spiral striations. The suture is margined above by a narrow thread 

 which extends beyond the aperture and encircles the base. The axials number thirteen 

 on the penultimate and ten on the body whorl. Spire slightly greater than height of 

 aperture. Aperture subcircular. Peristome thin, connected across parietal wall by a light 

 callus. Outer lip slightly sinuous. Basal lip shallowly notched. Columella vertical, 

 slightly arcuate. There is a linear chink between the columella and a broad low fasciolar 

 bulge. Ground colour pale horn, semi-transparent, with the axials standing out in 

 opaque relief. 



Height i-6 mm.; diameter i-i mm. (Holotype). 



Habitat: Off Three Kings Islands, Sts. 933, 934, 92 m. 



This new species superficially resembles Haurakia hamiltoni but differs in having a 

 striated protoconch, fewer and shorter axials, and a less prominent sutural ridge. 



Genus Austronoba, Powell, 1927 

 Type (original designation) : Rissoa candidissima, Webster 



Austronoba iredalei, n.sp. (Plate LII, fig. 12). 



Shell minute, thin, white, semi-transparent, imperforate; sculptured with distant 

 oblique rounded axials and closely spaced spiral lirations. Whorls five, including a 

 typical large dome-shaped protoconch of two smooth whorls. Axial ribs thirteen in 

 number on the penultimate and fifteen on the body whorl ; strongly developed on spire 

 whorls but becoming obsolete towards the periphery of the body whorl, and entirely 

 absent from the base. Spiral lirations with linear interspaces, and numbering fifteen on 

 the penultimate and twenty-three on the body whorl and base. There is a moderately 

 wide smooth subsutural band. Spire slightly taller than height of aperture. Outline of 

 whorls strongly convex. Aperture oblique-oval ; peristome thin, continuous ; outer lip 

 inclined forwards basally and with a broad shallow sinus towards the suture. 



Height 2 mm.; diameter 1-2 mm. (Holotype). 



Habitat: Off Three Kings Islands, St. 933, 260 m. 



