336 GASTROPODA. [Pectinibranchia. 



Colour white, slightly yellowish. Spire conic, a little higher than 

 the aperture ; outlines but faintly convex. Protoconch heterostrophe, 

 oblique, of 1 smooth and convex whorl. Whorls 4, regularly in- 

 creasing, flatly rounded ; base moderately convex. Suture impressed. 

 Aperture a little oblique, oval, angled above, narrowly effuse below. 

 Outer lip thin and sharp. Columella vertical, arcuate, with a small 

 plait above, which is deep within the aperture. Inner lip extending 

 a little beyond the columella, with a sharp edge, slightly broadening 

 below ; not spreading over the parietal wall. Operculum normal. 



Diameter, 1-6 mm. ; height, 3 mm. 



Animal unknown. 



Type in my collection. 



Hob. Te Onepoto Bay, near Lyttelton, type (T. Iredale) ; Queen 

 Charlotte Sound, in 16 fathoms (Captain Bollons). 



4. Odostomia denselirata, Suter, 1908. Plate 16, fig. 17. 



Odostomia denselirata, Suter, T.N.Z.L, xl, 1907 (1908), 364, pi. 28, f. 9. 



Shell minute, elongately oval, thin, semitransparent, slightly 

 shining, imperforate. Sculpture : The protoconch and the succeed- 

 ing whorl smooth, the others microscopically densely and distinctly 

 spirally striate ; growth-lines fine, vertical, and somewhat flexuous. 

 Colour white. Spire conical, very little higher than the aperture ; 

 outlines moderately convex. Protoconch heterostrophe, of 2 whorls, 

 smooth, polished, convex, nucleus lateral. Whorls 5, regularly in- 

 creasing, flatly convex ; base flat. Suture impressed. Aperture sub- 

 vertical, ovate, high, angled above, narrowed and produced below. 

 Outer lip regularly convex, thin and sharp. Columella vertical, arcuate, 

 with a small plait above. Inner lip extending very little beyond the 

 pillar, but broadening towards the base. Operculum unknown. 



Diameter, 1-25 mm. ; height, 2-5 mm. 



Animal unknown. 



Type in my collection. 



Hob. Near Little Barrier Island, in 20 fathoms, type (R. H. 

 Shakespear). 



5. Odostomia dolichostoma, Suter, 1908. Plate 16, fig. 18. 



Odostomia dolichostoma, Suter, T.N.Z.L, xl, 1907 (1908), 365, pi. 29, f. 11. 

 Shell small, ovate, imperforate, faintly shining, opaque. Sculpture 

 consisting of a few indistinct and distant spiral striae on the body- 

 whorl ; growth-lines rather strong, oblique. Colour yellowish-white. 

 Epidermis horny, very thin, easily wearing off. Spire conic, somewhat 

 scalar, about the same height as the aperture ; outlines almost straight. 

 Protoconch of 1 smooth and polished whorl, heterostrophe, oblique. 

 Whorls 4, the last very high, flatly convex, projecting out of the suture, 

 base faintly rounded. Suture deep. Aperture vertical, pyriform, high, 

 sharply angled above, broadly rounded and effuse below. Outer lip 



