Rissoa.'] GASTROPODA. 213 



Diameter, 1-1 mm. ; height, 1-6 mm. 

 Animal unknown. 

 Type in my collection. 



Hob. Lyall Bay, type (Miss Mestayer) ; near Taumaki Island, 

 west coast of the South Island, in 10 fathoms (Captain Bollons). 



22. Rissoa leptalea, Murdoch, 1905. Plate 12, fig. 22. 



Rissoa leptalea, Murdoch, T.N.Z.I.. xxxvii. 1904 (1905), 228, pi. 8, f. 23. 24. 



Shell minute, slender, smooth, sublimate, rather fragile, shining, 

 and semitransparent. Sculpture consisting of microscopic growth-lines 

 only. Colour white. Spire subcylindrical, nearly twice the height of 

 the aperture ; outlines rather convex. Protoconch minute. Whorls 5 

 having a somewhat loosely coiled, and those of the spire swollen, ap- 

 pearance. Suture impressed and lightly margined. Aperture oval- 

 rotund. Peristome continuous, broadly expanded. Columella short, 

 broad, and also expanded. Operculum unknown. 



Diameter, 0-66 mm. ; height, 1-94 mm. 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hob. -Whangaroa Harbour, type (C. Traill). 



23. Rissoa lubrica, Suter, 1898. Plate 12, fig. 23. 



Rissoa lubrica, Suter, P. Mai. S., iii, 5, f. 3 in text ; viii, 29, pi. 2, f. 24. 



Shell minute, elongately oval, pupiform, imperforate, semitrans- 

 parent, shining. Sculpture consisting of very fine and close micro- 

 scopic lirse, crossed by fine oblique growth-lines. Colour white. Spire 

 elevated, narrowly conical, twice the height of the aperture ; out- 

 lines slightly convex. Protoconch small, dome-shaped, microscopically 

 finely spirally striate, of 1^ convex whorls. Whorls 4 to 5, rather 

 rapidly increasing, lightly convex ; base rounded. Suture not much 

 impressed, margined below by a narrow band. Aperture subvertical, 

 oval. Peristome continuous, somewhat thickened. Basal lip slightly 

 expanded. Columella short, arcuate. Inner lip distinctly a little re- 

 flexed. Operculum unknown. 



Diameter, 0-6 mm. ; height, 1-75 mm. (type). Diameter, 0-8 mm. ; 

 height, 1-7 mm. (Bounty Island specimen). 



Animal unknown. 



Type in the Canterbury Museum, Christchurch. 



Hab. Foveaux Strait, in 15 fathoms (type) ; near the Bounty 

 Islands, in 50 fathoms (Captain Bollons). 



Remarks. This species has much the appearance of E. fumata, 

 Sut., and R. leptalea, Murd., but both are somewhat higher. The 

 former is much more prominently spirally lirate and the suture is not 

 margined, while the latter is quite smooth. It is a very rare shell, 

 only two specimens being known. 



