18 SUBANTARCTIC ISLANDS OF NEW ZEALAND. [Mullu 



Rissoa (Setia) micans, Webster, 1905. 

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

 Hdh. — Near the Snares Islands, in 50 fathoms (Captain J. Bollons). 

 Also Cook Strait and Plauraki Gulf. 



Rissoa (Setia) atomus, Sutcr, 1908. 

 Rissoa atomus, Suter, P. Mai. S., viii, 1908. j). 30. ]>1. ii, fig. 27. 



Hah. — 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. 

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

 Also Queen Charlotte Sound. 



Rissoa (Setia) porcellana, Suter, 1908. 

 Rissoa porcellana, Suter, P. Mai. S., viii, 1908, p. 30, j)I. ii, fig. 29. 

 Hctb. — Snares Islands, in 50 fathoms (Captain J. I^dllons). 

 Also Dusky Sound and ofl: Otago Heads. 



Genus Anabathron, Frauenfeld, 1S67. 

 Distribution. — Australasia. 



Anabathron gradatum, Suter, 1908. 

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

 Hah. — 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 H that of the apei-ture ; 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. ( )]ier(ulum 

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



Diameter, 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 



