GASTEROPODA 209 



Family EPITONIIDAE 

 Genus Aclis, Loven, 1846 

 Type : Aclis supranitida, Wood 

 Aclis maoria, n.sp. (Plate LVI, fig. 12). 



Shell very small, turreted, elongate, white, sculptured with sharp spiral keels. Whorls 

 *]\, including a globular smooth protoconch of two whorls. Spire about three times 

 height of aperture. Spire whorls with two prominent keels, increasing to three by the 

 penultimate. There is a fairly prominent supra-sutural spiral as well, and this almost 

 equals the strength of the keels on the body whorl. The base is smooth, almost flat, and 

 is separated from a deep crescentic umbilical cavity by a sharp ridge. Aperture quad- 

 rate. Peristome discontinuous. Outer lip thin and sharp. Pillar arcuate and slightly 

 reflected over the umbilicus. 



Height 3-4 mm.; diameter i-6 mm. (Holotype). 



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



Allied species are Hutton's Turritella (Eglisia) planostoma (1885, Trans. N.Z. Inst., 

 xvii, p. 320) from the Pliocene of Wanganui and my terebra (1930, Trans. N.Z. Inst., 

 LX, p. 538) which I incorrectly ascribed to Icuncula. 



Family ARCHITECTONICIDAE 

 Genus Zerotula, Finlay, 1926 

 Type (original designation) : Discohelix hedleyi, Mestayer 

 Zerotula triangulata, n.sp. (Plate LIV, figs. 15, 16). 



Shell minute, discoidal, thin, semi-transparent, glossy, spire and base concave; sur- 

 face smooth except for faint somewhat irregular axial growth lines. There are three 

 moderately strong spiral keels which render angulate the otherwise almost uniformly 

 convex whorls. The keels are equidistant in spacing, the middle one at the periphery, the 

 other two on the spire and the base respectively midway between periphery and suture. 

 Whorls 2§, protoconch minute, smooth, inrolled. Aperture circular. Peristome thin, 

 continuous, adnate to parietal callus for a very short space. The latter half of the body 

 whorl inclines slightly upwards, which results in the concave spire being slightly deeper 

 than the corresponding umbilical cavity. 



Height 0-55 mm.; major diameter i-i mm. (Holotype). 



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



This species differs from the genotype in having the whorls circular, not squarish, in 

 section. Both species have somewhat similar tricarinate sculpture. 



Zerotula crenulata, n.sp. (Plate LIV, figs. 6, 7). 



Shell minute, discoidal, moderately solid, opaque, white, spire and base slightly con- 

 cave; surface dull, sculptured with numerous rounded radial threads, having inter 



