2I 6 DISCOVERY REPORTS 



This species stands nearest to M. pygmaea, Sowerby, but differs in having a much 

 shorter and more obtuse spire, and a body whorl that is much inflated above but tapers 

 considerably below. 



Marginella (Glabella) manawatawhia, n.sp. (Plate LV, fig. 4). 



Shell small, solid, dull white, smooth volutiform. Spire about one-third height of 

 aperture, rather sharply conic. Body whorl inflated above and considerably tapered 

 below. Whorls four, including a comparatively small smooth low dome-shaped proto- 

 conch of one whorl. Aperture long and narrow, with parallel sides, deeply notched 

 above and broadly but shallowly notched below. Outer lip straight, thickened by a 

 heavy smooth varix which is finely denticulate along its inner margin. Columella with 

 four equidistant oblique plaits. 



Height 5-9 mm.; diameter 3-2 mm. (Holotype). 



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



This species also resembles pygmaea but has a slightly higher spire, more tapered 

 body whorl, parallel-sided aperture, and distinct denticles along the inside of the 

 outer lip. 



Marginella (Glabella) pygmaeiformis, n.sp. (Plate LV, fig. 3). 



Shell small, solid, white, glossy, volutiform. Spire about one-sixth height of aperture. 

 Whorls three, including a small dome-shaped smooth protoconch of one whorl. Aper- 

 ture long and narrow with parallel sides, channelled above and broadly but shallowly 

 notched below. Outer lip straight, thickened by a heavy smooth varix which is finely 

 denticulate along its inner margin. The labial callus spreads above right to the suture. 

 Columella with four equidistant oblique plaits. 



Height 4-8 mm. ; diameter 3 mm. (Holotype). 



Habitat: Off Three Kings Islands, St. 934, 92 m. 



This species has a similar spire and the general proportions of pygmaea, but differs in 

 having a more narrowly tapered base and parallel-sided aperture with denticles along 

 its inner edge, as in the preceding species. 



Subgenus Serrata, Jousseaume, 1875 

 Type (by tautonomy) : Marginella serrata, Gaskoin 

 Marginella (Serrata) subamoena, n.sp. (Plate LV, fig. 6). 



Shell small, white, glossy, broadly ovate-biconic. Spire broadly and bluntly conical, 

 less than half height of aperture. Whorls 3A including broad flattened dome-shaped 

 protoconch of about one whorl. Body whorl tumid above but tapered rapidly below to 

 almost the size of the protoconch. Aperture long, rather narrow with subparallel sides, 

 slightly channelled both above and below but not notched. Outer lip smooth, slightly 

 thickened, broadly arcuate. Columella with four equidistant oblique plaits. 



Height 3-8 mm.; diameter 2-5 mm. (Holotype). 



Habitat: Off Three Kings Islands, St. 932, 185 m. 



