2o8 DISCOVERY REPORTS 



of one whorl. Post-nuclear sculpture of dense microscopic spiral striae, crossed by 

 regular closely spaced axial growth lines. Aperture oval, extremely large, occupying 

 more than two-thirds the base. Outer lip thin and sharp. Inner lip sinuous, kinked at 

 about half the height of the aperture and from there broadly spreading, the outer edge 

 forming the parietal callus margin and the inner the broad spiral columella. Internal 

 crepidulid-like shelf set deeply within the aperture. Spire about one-third height of 

 aperture. 



Height 0-9 mm.; diameter 0-9 mm. (Holotype). 



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



This is the second species of the genus, and it differs from the genotype in being much 

 more globose, and in having a less twisted columella and a taller spire. 



Family AMPHIPERATIDAE 



Genus Pedicularia, Swainson, 1840 



Type (by monotypy) : Pedicularia sicula, Swainson 



Pedicularia maoria, n.sp. (Plate LIV, figs. 13, 14). 



Shell small, ovate, but no doubt variable in outline according to the shape of the 

 organism upon which it is commensal. Sculptured with about sixty-six fine, rounded, 

 spiral threads, with interspaces of equal width, or varying to 1 \ times the width of the 

 threads. The whole is crossed by fairly numerous flexuous concentric growth ridges. 

 Apical whorls bluntly conical, immersed upon the underside by the body whorl. The 

 tip is smooth, low, dome-shaped, and the remaining spire whorls (approximately two) 

 are sculptured with about six closely spaced spiral ridges which are cut up into square 

 granules by deeply incised axial grooves. Aperture oblong, extremities broadly notched, 

 peristome entire, thin; inner lip as a raised attenuated callus, which is spirally ridged on 

 the outside, the ridges being considerably coarser than, and often slightly oblique to the 

 normal spiral sculpture of the body whorl ; outer lip thin, similarly raised. Columella 

 expanded medially, slightly convex, without denticles but with a distinct anterior notch. 

 Posteriorly the columella is bordered by a weak canal. Colour uniformly pale buff. 



Length 4-9 mm. ; breadth 2-5 mm. ; thickness 1-9 mm. (Holotype). 



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



The only specimens are empty shells, so the nature of the host is unknown. Judging 

 by the compressed aperture of the shell the host is in all probability a branching 

 bryozoan of small diameter. 



This adds a genus and family to the New Zealand fauna. The Australian species, 

 P. stylasteris, Hedley, 1903, from off Wollongong, in 49-50 fathoms, New South Wales, 

 differs from the New Zealand species in having a denticulate columella and an apex 

 almost completely buried. 



