Suter. — Nav Species of Neio Zealand Mollusca. 363 



spaced nearly straight growth-lines, crossed by fine, some- 

 times very indistinct, spiral striae. Colour white, occasionally 

 tinged with yellowish or pink. Spire conic, about 1^ times 

 the height of the aperture ; outlines straight. Protoconch 

 very small, heterostrophe, of 1 smooth whorl. Whorls 8*in 

 quite adult examples, but the shells usually obtained have 6 

 whorls ; they increase regularly, are flatly convex, and the last 

 whorl is usually distinctly angled at the periphery, but some- 

 times rounded. Suture impressed, submargined below. Outer 

 lip sharp, slightly convex ; basal lip acutely convex and ex- 

 panded. Columella oblique, with a prominent oblique plait 

 above, concave below ; inner lip broadly reflected below, spread- 

 ing as a very thin callus over the parietal wall. Base with a 

 distinct umbilical fissure. 



Diameter, 3-5 mm. ; height, 7-5 mm. Specimen of 8 whorls. 



Diameter, 3 mm. ; height, 5 mm. Specimen of 6 whorls. 



Type in the Dominion Museum, Wellington. 



Hah. — Stewart Island, type ; Lyttelton Harbour, in 2 fathoms 

 (H. S.) ; Akaroa Harbour, in 6 fathoms (H. S.) ; Blind Bay ; 

 Narrow Neck Reef, Devonport (H. S.) ; near Channel Island, 

 Hauraki Gulf, in 25 fathoms. 



Fossil in the Pliocene. 



Remarks. — The Australian 0. angasi, Tryon (= 0. lactea, 

 Angas), is a much more slender, subulate species, which has 

 the body-whorl rounded, never angled. 



6. Odostomia (s. str.) taumakiensis, n. sp. Plate XXVIII, fig. 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 elevated - conic, about 1| 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 sub vertical, oval, angled above, rounded and 

 effuse below. Outer lip thin and sharp. Columella 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. 



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



Type in my collection. 



Rah. — Near Taumaki Island, west coast of the South Island, 

 in 10 fathoms, type ; near the Snares and Bounty Islands, in 

 50 fathoms (Captain Bollons). 



