Odostomia.] GASTROPODA. 343 



ture ; outlines straight. Protoconch small, heterostrophe, of 1 upright 

 whorl, smooth and shining. Whorls 6, regularly increasing, flatly 

 convex, somewhat contracted below at the suture, and slightly pro- 

 jecting above out from the suture ; base flat. Suture deep, narrowly 

 margined below. Aperture oblique, pyriform, slightly and broadly 

 effuse below. Outer lip thin and sharp. Columella vertical, strongly 

 arcuate, with a moderate plait above, situate rather deep within the 

 aperture. Inner lip very narrow, spreading as a very thin callous 

 layer over the parietal wall. Umbilical fissure narrow. Operculuw 

 unknown. 



Diameter, 1-9 mm. ; height, 3-8 mm. 



Animal unknown. 



Type in my collection. 



Hob. Five miles south of Cuvier Island, in 38 fathoms, type 

 (Captain Bollons). 



17. Odostomia impolita, Hutton, 1873. Plate 17, fig. 6. 



Rissoa impolita, Hutt., C.M.M., 29 ; J. de Conch., 1878, 28 ; P.L.S. N.S.W., 

 ix, 941. Barleeia impolita, Hutt., M.N.Z.M., 81 ; Suter, P. Mai. S., iii, 7. 

 Odontostoma impolita, Hutt., Index, 74. Odostomia impolita, Hutt. ' 

 Murdoch, T.N.Z.I., xxxvii, 226, pi. 8, f. 18. 



Shell very small, ovato-conic, solid, slightly polished, imperforate. 

 Sculpture consisting of numerous flat and rather broad spiral threads, 

 with much narrower interspaces ; growth-lines oblique and very fine. 

 Colour white, with a yellowish tinge, more distinct on the upper whorls. 

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

 straight. Protoconch minute, slightly heterostrophe, of 1 smooth whorl. 

 Whorls 5, regularly increasing, slightly convex ; base flattish. Suture 

 linear, not much impressed, margined below by one of the spirals. 

 Aperture subvertical, oval, angled above and effuse below. Outer 

 lip moderately convex, fairly strong and sharp. Columella vertical, 

 with a small plait above, concave below. Inner lip sometimes broadly 

 expanded beyond the pillar, and produced below to a point. Operculum 

 brown, horny. 



Diameter, 1-5 mm. ; height, 2-5 mm. (type, of 4 whorls). Dia- 

 meter, 2-2 mm. ; height, 4-2 mm. (specimen of 5 whorls). 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hob. Stewart Island (type) ; Foveaux Strait, in 15 fathoms : 

 Taumaki Island, west coast of the South Island, in 10 fathoms (Captain 

 Bollons) ; Banks Peninsula (Iredale). 



18. Odostomia liricincta, Suter, 1908. Plate 17, fig. 7. 



Odostomia (Evalea) liricincta, Suter, T.N.Z.I., xl, 1907 (1908), 367, pi. 29, 

 f. 16. 



Shell very small, elongate-oval, imperforate, spirally lirate, slightly 

 shining. Sculpture consisting of unequal flat spiral lirse, absent on 



