GASTEROPODA 199 



Height 1-5 mm.; diameter 0-5 mm. (Holotype). 



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



This, the second known species of the genus, differs from the Tasmanian genotype 

 in having the upper and lower keels obsolete from the protoconch and only the middle 

 one remaining. The post-nuclear characters, however, are almost identical, the axials 

 being finer and more numerous and the whorls higher. 



Iredale (1924, Proc. Linn. Soc. N.S.W., xlix, p. 244), in proposing the genus, wrote 

 that it was a very peculiar form without any known close relations and certainly not re- 

 ferable to the Rissoidae. However, Iredale does not indicate to which family he con- 

 siders the species really belongs, so I prefer to leave it in the Rissoidae, particularly as 

 Coenaciilum appears not very dissimilar from Awanuia, a new genus which I proposed in 

 1927 {Trans. N.Z. Inst., lvii, p. 538) and referred to the vicinity of Merelina in the 

 Rissoidae. 



Genus Manawatawhia, n.gen. 



Type: Manawatawhia analoga, n.sp. 



This genus resembles Rissoina in general features but differs in having a carinate 

 protoconch and a simple, not channelled, basal lip. It is evidently much nearer to 

 Anabathron, which has a similar protoconch and apertural features, but different type 

 of sculpture. The simple axials of Manawatazvhia, without spirals of any sort, are so 

 opposed to the strong spiral keels, plus dense axial foliations of Anabathron, that the 

 above-proposed genus is considered necessary for this species alone. 



Manawatawhia analoga, n.sp. (Plate LII, fig. 14). 



Shell minute, fairly solid, white, elongate-cylindrical, sculptured with strong vertical 

 costae. Whorls 5f, plus a comparatively large blunt tricarinate protoconch of if whorls, 

 apex inrolled leaving a tiny apical cavity. Spire tall, z\ times height of aperture, with 

 outlines evenly and moderately convex. The axial costae number fourteen on the last 

 whorl ; they finish at the suture, the base being smooth, and the interspaces are about 

 1 \ times the width of the costae. Aperture D-shaped, the flat parietal side lying at 

 about 45 to the axis of the shell. Outer lip strengthened on the outside by a massive 

 varix. In profile the aperture is inclined forwards basally. Parietal callus long and 

 straight with a slight bulge or fold towards the base of the pillar. Peristome continuous 

 and not channelled. 



Height i-8 mm. ; diameter 0-7 mm. (Holotype). 



Habitat: Off Three Kings Islands, Sts. 933, 934, 260 m. 



Genus Notosetia, Iredale, 1915 

 Type (original designation) : Barleeia neozelanica, Suter 

 Notosetia subgradata, n.sp. (Plate LIII, fig. 10). 



Shell very small, ovate, rather thin, white. Whorls 3f, including a relatively large 

 dome-shaped protoconch of \\ smooth whorls. Spire strongly gradate, a little less than 



