364 Transactions. 



Remarks. — Prom 0. proximo this species is distinguished 

 by being imperforate, having very faint or no spiral sculpture, 

 the suture margined, and only 5 whorls ; from 0. marginata 

 by the same characters, except the margined suture, and the 

 body-whorl not being angled. 



7. Odostomia (s. str.) inornata, n. sp. Plate XXVIII, fig. 8. 

 Shell small, subulate, imperforate, fairly solid, lightly 



polished, smooth. Sculpture consisting of straight and fine 

 growth-lines only. Colour white. Spire broadly subulate, 

 twice the height of the aperture ; outlines straight. Proto- 

 conch heterostrophe, oblique, globular, of 1 whorl, smooth. 

 Whorls 6, regularly increasing, the last rather high, but slightly 

 convex, body- whorl sometimes faintly angled at the periphery ; 

 base flat. Suture impressed, narrowly and rather indistinctly 

 margined below. Aperture subvertical, narrowly pyriform, 

 rounded and produced below. Outer lip slightly convex, 

 sharp. Columella somewhat oblique, arcuate, with a distinct 

 oblique and deeply placed plait above ; inner lip narrow above, 

 but broadening toward the base, spread as a thin callus over 

 the parietal wall. Sometimes there is a narrow umbilical chink 

 present. 



Diameter, 2*5 mm. ; height, 6-1 mm. 



Type in my collection. 



Hab. — Near the Snares (type) and Bounty Islands, in 

 50 fathoms (Captain Bollons). 



Remarks. — This species is apparently nearly allied to 0. 

 hyphala, Wats., but the whorls are not slightly scalar, the suture 

 is less deep, the columella!' plait stronger. &c. 



8. Odostomia (s. str.) denselirata, n. sp. Plate XXVIII, fig. 9. 



Shell minute, elongately oval, thin, semitransparent, slightly 

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

 ceeding 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. Proto- 

 conch heterostrophe, of '1 whorls, smooth, polished, convex, 

 nucleus lateral. Whorls 5, regularly increasing, flatly convex; 

 base flat. Suture impressed. Aperture subvertical, ovate, high, 

 angled above, narrowed and produced below. Outer lip regu- 

 lar! y 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. 



Diameter, L*25mm. ; height, 2*5 mm. 



Type in my collection. 



