18 SUBANTARCnC ISLANDS OP NEW ZEALAND. [Mollwsca. 



Rissoa (Setia) micans, Webster, 1905, 

 Rissoa micans, Webster, T.N.Z.I., xxxvii, 1904 (1905), p. 277, pi. ix, fig. 4. 

 Hab. — Near the Snares Islands, in 50 fathoms (Captain J. BoUons). 

 Also Cook Strait and Hauraki Gulf. 



Rissoa (Setia) atomus, Suter, 1908. 



Rissoa atomus, Suter, P. Mai. S., viii, 1908, p. 30, pi. ii, fig. 27. 



Hnh. — Near the Bounty Islands, in 50 fathoms (Captain J. Bollons). 



Rissoa (Setia) verecunda, Suter, 1908. 

 Rissoa verecunda, Suter, P. Mai. S., viii, 1908, p. 30, pi. ii, fig. 28. 

 Hnh. — Snares Islands, in 50 fathoms (Captain J. Bollons). 

 Also Queen Charlotte Sound. 



Rissoa (Setia) porcellana, Suter, 1908. 

 Rissoa forcdlann, Suter, P. Mai. S., viii, 1908, p. 30, pi. ii, fig. 29. 



Hnh. — Snares Islands, in 50 fathoms (Captain J. Bollons). 

 Also Dusky Sound and off Otago Heads. 



Genus Anabathron, Frauenfeld, 1867. 

 Distribution. — Australasia. 



Anabathron gradatum, Suter, 1908. 



Anabathron gradatum, Suter, P. Mai. S., viii, 1908, p. 32, pi. iii, fig. 33. 

 Hab. — Snares Islands, in 50 fathoms (Captain J. Bollons). 



Genus Rissoina, d'Orbigny, 1840. 

 Distribution. — World-wide. 



Rissoina (Eatoniella) chiltoni, n. sp. (Plate I, fig. 2.) 



Shell minute, elongated conic, imperforate, rather solid, smooth, black. There 

 is no sculpture ; the surface in most specimens much corroded. Colour black, 

 peristome white, interior of aperture bluish-black. Spire conic, obtuse ; its height 

 about \\ that of the aperture ; outlines straight. Protoconch somewhat globular. 

 Whorls 5, regularly increasing, very lightly convex ; base rounded. Suture not 

 much impressed. Aperture subvertical, oval, angled above. Peristome continuous, 

 simple, straight and sharp, very little callous inside. Columella short, arcuate ; 

 inner lip slightly expanded towards the very slight umbilical depression. Operculum 

 horny, rather thin, with an oblique claviform inner process. 



Wameter, 1*5 mm. ; height, 2-7 mm. 



Dentition : Central tooth rhomboidal, with 5 denticles, the mesial larger than 

 the others. Lateral tooth elongated, with a broad short reflection, and 5 small 



