Odostomia.] GASTROPODA. 341 



13. Odostomia takapunaensis, Suter, 1908. Plate 17, fig. 2. 



Odostomia takapunaensis, Suter, T.N.Z.I., xl, 1907 (1908), 305, pi. 28, f. 10. 



Shell small, conical, narrowly umbilicate, smooth, fairly solid, 

 shining. There is no sculpture. Colour white. Spire conic, about 

 twice the height of the aperture ; outlines straight. Protoconch 

 heterostrophe, of 2 oblique whorls, nucleus lateral. Whorls 7, regu- 

 larly increasing, flatly convex, the last angularly rounded at the 

 periphery ; base flat. Suture impressed. Aperture subvertical, oval, 

 broadly angled above, effuse below. Outer Up slightly arcuate, sharp. 

 Columella subvertical, arcuate, with a distinct oblique plait above. 

 Inner lip narrow, broadening a little below, thin over the parietal 

 wall. Umbilicus narrow, but very distinct and quite open. Oper- 

 culum unknown. 



Diameter, 2*2 mm. ; height, 4 mm. 



Animal unknown. 



Type in my collection. 



Hab. Takapuna Reef, in sand ; type (H. S.). 



14. Odostomia taumakiensis, Suter, 1908. Plate 17, fig. 3. 



Odostomia taumakiensis, Suter, T.N.Z.I., xl, 1907 (1908), 363, pi. 28, f. 7. 



Shell very small, elongately ovate, imperforate, smooth and 

 polished, thin, translucent. Sculpture consisting occasionally of a 

 few microscopic indistinct spiral striae on the body- whorl, but very 

 often absent ; growth-lines fine, oblique. Colour white. Spire ele- 

 vated conic, about 1J times the height of the aperture ; outlines 

 somewhat convex. Protoconch minute, heterostrophe, but slightly 

 tilted, of 1 smooth whorl, globular. Whorls 5, regularly increasing, 

 lightly convex ; base flatly rounded. Suture impressed, margined 

 below by a rather broad band. Aperture subvertical, oval, angled 

 above, rounded and effuse below. Outer lip thin and sharp. Colu- 

 mella slightly oblique, arcuate, with a deeply situated and not very 

 prominent plait above. Inner lip but slightly expanded, forming a 

 very thin and shining layer on the parietal wall. Operculum un- 

 known. 



Diameter, 1-5 mm. ; height, 3-2 mm. 



Animal unknown. 



Type in my collection. 



Hab. Taumaki Island, west coast of the South Island, in 10 

 fathoms (type) ; near the Snares and Bounty Islands, in 50 fathoms 

 (Captain Bollons). 



Remarks. From 0. Murdochi this species is distinguished by being 

 imperforate, having very faint or no spiral sculpture, the suture 

 margined, and only 5 whorls ; from 0. stygia by the same cha- 

 racters, except the margined suture, and the body- whorl not being 

 augled. 



