Odostomia.] GASTROPODA. 335 



with a feeble and deep-seated plait above. Inner lip narrow. Um- 

 bilical chink very small. Operculum unknown. 



Diameter, 14mm.; height, 2-7 mm. 



Animal unknown. 



Type in my collection. 



Hab. --Port Pegasus, Stewart Island, in 18 fathoms (Captain 

 Bollons). 



Remark. The only shell at my disposal is hardly adult. 



2. Odostomia bembix, Suter, 1908. Plate 16, fig. 15. 



Odostomia lactea, Angas : Hutton, C.M.M., 22 ; J. de Conch., 1878, 24 ; 

 M.N.Z.M., 73 ; P.L.S. N.S.W., ix, 935 ; Plioc. M., 57, pi. 7, f. 48, not 

 of Angas nor of Dunker. 0. Anyasi, Tryon, Index, 74, not of Tryon. 

 0. bembix, Suter, T.N.Z.I., xl, 1907 (1908), 362, pi. 28, f. 6. 



Shell small, ovato-conic, subperforate, slightly polished, sub- 

 diaphanous, fairly solid. Sculpture consisting of irregularly spaced 

 nearly straight growth-lines, crossed by fine, sometimes very indis- 

 tinct, 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 

 sometimes rounded. Suture impressed, submargined below. Aper- 

 ture ovate, angled above, strongly effuse below. Outer lip sharp, 

 slightly convex. Basal lip acutely convex and expanded. Columella 

 oblique, with a prominent oblique plait above, concave below. Inner 

 lip broadly reflected below, spreading as a very thin callus over the 

 parietal wall. Base with a distinct umbilical fissure. Operculum un- 

 known. 



Diameter, 3-5 mm. ; height, 7-5 mm. (type, of 8 whorls). Diameter. 

 3 mm. ; height, 5 mm. (specimen of 6 whorls). 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hab. Stewart Island (type) ; Lyttelton Harbour, in 2 fathoms 

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

 Neck Reef, Takapuna (H. S.) ; near Channel Island, in 25 fathoms. 



Remark. The Australian 0. Angasi, Tryon (= lactea, Ang.) is 

 a much more slender, subulate species, which has the body-whorl 

 rounded, never angled. 



Fossil in the Pliocene. 



3. Odostomia cryptodon, Suter, 1908. Plate 16, fig. 16. 



Odostomia cryptodon, Suter, T.N.Z.I., xl, 1907 (1908), 365, pi. 29, f. 12. 



Shell very small, ovate, fairly solid, imperforate, smooth, slightly 

 shining. There is no sculpture, except fine oblique growth-lines. 



