Suter. — Neiv Species of Netu Zealand Mollusca. 371 



axially striate. Whorls 6 to 7, the last high, concave on the 

 shoulder, convex below it ; base contracted. Suture not deep, 

 undulating. Aperture somewhat oblique, narrowly channelled 

 above, with an oblique narrowly open and slightly recurved 

 canal below, its base notched. Outer lip thick, with a distinct 

 varix outside, callous and denticulate within. Columella ver- 

 tical, concave, with transverse ridges over the whole length ; 

 inner lip narrow, spreading over the concave parietal wall, 

 which bears a tubercle above ; narrowed below to a point. 

 Some specimens have a distinct depression between the fasciole 

 and the edge of the canal. Operculum unknown. 



Diameter, 14 mm. ; height, 26 mm. Type specimen. 



Type in the Dominion Museum, Wellington. 



Hah. — East Cape Lighthouse, type ; Foveaux Strait. 



Remarks. — This species is very variable in size; my largest 

 specimen, of 7 whorls, measures 17 mm. by 32 mm., the smallest 

 also of 7 whorls, 10-5 mm. by 21 mm., but numerous inter- 

 mediate forms occur. 



21. Tritonidea (s. str.) colensoi, n. sp. Plate XXX, fig. 6. 



Shell small, ovate, solid, distinctly broadly spirally Urate, 

 and more or less distinctly axially costate on the spire- whorls. 

 Sculpture consisting of broad and flattish spiral lira?, 3 on the 

 penultimate, 9 to 10 on the body whorl, the interstices narrow, 

 linear ; they are crossed on the spire- whorls by flatly rounded 

 axial ribs, about 12 on a whorl, which usually cut up the spirals 

 into squarish nodules. Colour white, the spiral grooves pur- 

 plish-brown, a few longitudinal narrow light-brown bands 

 passing over the body-whorl and across the interstices of the 

 axial ribs ; aperture purple within, outer lip and columella 

 white. Spire short, conic, about the same height as the aper- 

 ture ; outlines faintly convex. Protoconch very small, convex, 

 of 1| smooth whorls. Whorls 5, the last high, flattish ; base 

 lightly contracted. Suture not deep, uneven. Aperture some- 

 what oblique, narrowly channelled above, produced below into 

 a short oblique and narrowly open canal, its base notched. 

 Outer lip very thick, with a blunt edge and a broad varix on 

 the outside ; inside callous, denticulate-lirate. Columella ver- 

 tical, lightly concave, with several ridges at its base ; inner 

 lip narrow, not distinctly bounded, extending over the concave 

 parietal wall, which has one or two tubercular plaits above ; at 

 the base the lip is narrowed towards the canal. Operculum 

 unknown. 



Diameter, 10 mm. ; height, 18 mm. 



Type in the Dominion Museum, Wellington. 



Hah. — East Cape Lighthouse. 



