Triphora.} GASTROPODA. 257 



Wkorls about 11, regularly increasing, almost flat. Suture not much 

 impressed. Aperture broadly oval, vertical, angled above, produced 

 below into a short, slightly recurved, and narrowly open canal, its 

 base not emarginate. Outer lip sharp, sinuated by the spiral sculp- 

 ture, with a shallow sutural sinus. Columella short, perpendicular, 

 bent ofi and drawn out to a point upon the inner margin of the canal. 

 Operculum unknown. 



Diameter, 1-5 mm. ; height, 5-25 mm. (one of the types with 11 

 whorls). 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hob. Stewart Island, in 30 fathoms (type) ; Whangaroa Harbour 

 (C. Traill) ; Bounty and Snares Islands, in 50 fathoms (Captain 

 Bollons) ; Whangarei Heads (C. Cooper). 



Remarks. The specific name minima being preoccupied in Triphora 

 by Pease, 1870, I changed it to T. Huttoni. The nearly allied Aus- 

 tralian T. Angasi, Crosse, has a much more prominent axial sculpture, 

 the cinguli are gemmate, and the base has 2 keels. T. Kesteveni, 

 Hedley, from Sydney Harbour, is another nearly related form. 



i. Triphora infelix, Webster, 1906. Plate 15, fig. 3. 



Triphora infelix, Webster, T.N.Z.L, xxxviii, 1905 (1906), 307, pi. 38, f. 6, 6. 

 Triforis gemmulata, Adams and Reeve : von Martens, Grit. List, 1893. 

 Triphoris yemmulalus, Ad. & Rve. : Hutton, M.N.Z.M., 75 ; P.L.S. 

 N.S.W., ix, 937, Index, 76, not of Adams and Reeve. 



Shell small, subulate, rather fragile. Sculpture : The 5-whorled 

 protoconch has the nucleus smooth, the other whorls acutely angled 

 and axially microscopically striated ; the next four whorls have 2 keels ; 

 on the ninth or tenth whorl a third keel is introduced between the 

 other two, which at first is more slender than the others, but gradually 

 increases in width ; these are crossed by 18 to 20 axial riblets, mostly 

 slightly oblique, the crossing - points raised into roundish not very 

 prominent gemmules ; the last whorl with a smooth suprasutural 

 keel, at which the axial sculpture stops, and 2 keels upon the base. 

 Colour white. Spire very high ; outlines almost straight. Proto- 

 conch conic, nucleus small, globose. Whorls 15 to 18, regularly in- 

 creasing, flat; base slightly concave. Suture impressed, sometimes 

 margined above by a fine thread. Aperture subquadrate, produced 

 below into a short and open canal, slightly bent to the right, with an 

 emarginate base. Outer Up thin and sharp, sinuated, with a distinct 

 sutural notch. Basal lip straight, nearly horizontal. Columella short, 

 vertical, straight, terminating in a point at the margin of the canal. 

 Operculum unknown. 



Diameter, 1-5 mm. ; height, 6 mm. (type, with 15 whorls). Dia- 

 meter, 2-2 mm. ; height, 8-8 mm. (with 18 whorls, from Stewart Island). 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



9 Moll. N.Z. 



