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Genus Syrnola A. Adams, 1860.
Type: Syrnola gracillima A. Adams.
Syrnola wallacei n. sp. (Fig. 54.)
Shell small, elongate, conic; spire about 4 times height of aperture. Whorls nine, flat to slightly convex on spire, body-whorl rounded at periphery, base slightly convex, sloping inwards at about 45°. Protoconch heterostrophic, paucispiral, with large nucleus. Suture channelled. Surface smooth and shining with merest suggestion of axial ribs; body-whorl with one or two very weak spiral threads on line of suture which is below periphery. Aperture oval. Outer lip sinuous, convex below. Columella with strong sharp fold high up.
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Holotype in collection of N.Z. Geological Survey.
Height, 4.75 mm.; diameter, 1.4 mm.
Differs from S. semiconcava Marsh, and Murd. and S. menda Finlay in more convex outline of whorl and deeper suture, and from S. lurida Suter and S. tenuiplicata Murd. and Sut. in much shorter body-whorl and stronger columellar fold.
Syrnola aclyformis n. sp. (Fig. 55.)
Shell small, elongate, conic; spire four times height of aperture. Whorls nine, flat, increasing very gradually; body-whorl broadly rounded at periphery. Protoconch heterostrophic, narrow and high. Suture scarcely indenting outline. Surface smooth, shining, with faint growth-lines sloping obliquely forward. Aperture incomplete in the single specimen; but columella with strong fold.
Height, 5.1 mm.; diameter, 1.4 mm.
Distinguished from other described species in New Zealand by the shallow suture, and consequent straight outline.