190 DISCOVERY REPORTS 



Height i-6 mm.; diameter 1-5 mm. (Holotype). 

 Habitat: Off Three Kings Islands, St. 933, 260 m. 



This species resembles Fossarus brumalis, Hedley, 1907 (Proc. Linn. Soc. N.S.W., 

 xxxii, p. 502), from 17 to 20 fathoms off Hope Islands, Queensland. 



Fossarus maoria, n.sp. (Plate XLIX, figs. 8, 9). 



Shell small, thin, auriform, white, keeled and widely umbilicate. Whorls z\, very 

 rapidly increasing, including a small smooth protoconch of one whorl, obliquely tilted, 

 the apex immersed. Spire less than half height of aperture. Sculpture consisting of a 

 few equispaced rather sharp-crested prominent spiral keels, three on the spire whorl 

 and seven on the body whorl. The lower four keels do not encroach far over the base, 

 the major portion of which is a wide gentle concavity leading to the actual umbilicus 

 which is deep and about one-eighth the diameter of the shell. There is no axial sculpture 

 apart from rather distant and somewhat irregular growth lines which show most pro- 

 minently in the basal concavity leading to the umbilicus. Aperture oblique, rhom- 

 boidal. Peristome thin, discontinuous. Inner lip deeply concave but somewhat 

 flattened medially. 



Height 1-5 mm.; diameter 2 mm. (Holotype). 



Habitat: Off Three Kings Islands, St. 933, 260 m. 



This resembles the above species but is much more depressed and widely umbilicate. 



Family RISSOIDAE 

 Genus Haurakia, Iredale, 191 5 

 Type (original designation) : Rissoa hamiltoni, Suter, 1 898 

 Haurakia finlayi, n.sp. (Plate LII, fig. 1). 



Shell small, elongate-conic, white, rather thin and semi-transparent. Whorls five, 

 including a bluntly rounded protoconch of two smooth glossy whorls. Post-nuclear 

 whorls with flatly convex sides and sculptured with regular broad axial plications, about 

 twice their width apart. There are sixteen axials on the penultimate and twenty-one on 

 the body whorl, and they stop suddenly at the periphery of the body whorl where there is 

 a very weak spiral thread which proceeds from immediately above the suture. Base 

 smooth, flattish. Spire about i| times height of aperture. Aperture ovate. Peristome 

 continuous across parietal wall, slightly thickened externally. There is no umbilical 

 chink. 



Height 2-9 mm.; diameter i-6mm. (Holotype). 



Habitat: Off Three Kings Islands, St. 933, 260 m. 



Related to the southern New Zealand H. huttoni (Suter) rather than to the littoral 

 genotype. In the genotype the axials terminate suddenly at a strong peripheral keel, 

 but in the huttoni group (there are a number of undescribed species) the axials diminish 

 but do not abruptly terminate at a very feeble peripheral thread. 



