Odostomia.] GASTROPODA. 337 



regularly arched, a little thickened inside, sharp. Columella sub- 

 vertical, arcuate, with a feeble plait above, placed rather deep within. 

 Inner lip spreading a little beyond the pillar, having a sharp outer 

 edge, broadening towards the base, and extending as a very thin 

 glaze over the parietal wall. Operculum horny, inner margin very 

 little indented. 



Diameter, 2-1 mm. ; height, 4-2 mm. 



Animal unknown. 



Type in my collection. 



Hab. Cheltenham Beach, near Auckland, type (H. S.). 



6. Odostomia hyphala, Watson, 1886. Plate 16, fig. 19. 



Odostomia hyphala, Watson, Chall. Rep., xv, 483, pi. 31, f. 2. 



Shell strougish, oblong, broadly conical, very slightly scalar and 

 subumbilicate, white, with a small upturned but not sinistral tip, 

 flat-sided conical whorls, a slightly impressed suture, a rounded shortly 

 produced base, and a largish oblong almost direct mouth. Sculpture 

 none but flexuous strongish unequal lines of growth. Colour trans- 

 lucent white, with a rather dull surface. Spire conical, broad, nearly 

 twice the height of the aperture. Apex eroded, but apparently con- 

 tracting rather suddenly to a small tip, which is slightly turned over 

 on one side. Whorls 7, of rapid but regular increase ; they are broad, 

 but not high ; each has a slight contraction at the bottom, and above 

 this is faintly convex and then flat-sided ; at the top of the shell they 

 project very slightly and sharply out of the suture ; the last is round, 

 with a shortly produced base. Suture strongish from the contraction 

 above it and the slight projection of the whorl below. Aperture rather 

 large, oblong, pointed above and at the front of the pillar. Outer Up 

 thin, patulous at the base, and slightly guttered at the point of the 

 pillar. Columella arcuate, with a very slight plait, which is oblique, 

 lies deep within the mouth and close to the top of the columella. Inner 

 lip a mere gloss on the body, from which it runs on continuously into 

 the columella ; here it is very thin and patulous, concealing the um- 

 bilicus. (Watson.) 



Diameter, 3 mm. ; height, 6-25 mm. Aperture breadth, 1-75 mm. ; 

 height, 2-5 mm. 



Animal unknown. 



Type in the British Museum. 



Hab. Challenger Station 169, north-east from the East Cape, in 

 700 fathoms (type). 



7. Odostomia fastigiata, Suter, 1907. Plate 16, fig. 20. 



Odo-stomia fastigiata, Suter, T.N.Z.I., xxxix, 1900 (1907), 255, pi. 9, f. 3. 



Shell small, subcylindrically acuminate, imperforate, smooth, with 

 a distinct columellar plait. There is no sculpture except distinct 



