GASTEROPODA 189 



situated at about the anterior third. Height almost two-thirds the length ; anterior slope 

 straight, posterior slope broadly rounded. There is no sculpture apart from irregular 

 concentric growth lines. Margin sharp and smooth, convex at the sides and slightly 

 concave at the ends. Interior white, smooth, showing horseshoe-shaped muscular 

 impression. 



Length 3-1 mm.; breadth 1-9 mm.; height i-8 mm. (Holotype). 



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



This species is most nearly allied to T. compressa (Suter, 1908), from which it differs 

 in being not nearly so compressed and in having the nucleus less erect. 



Tectisumen finlayi, n.sp. (Plate XLIX, figs. 6, 7). 



Shell small, thin, white, slightly compressed, conical, ends rounded and slightly 

 upcurved. Nucleus a tiny smooth rounded point, inclined slightly forwards and situated 

 at about the middle. Height about half the length, anterior slope straight, posterior 

 slope slightly convex. There is no sculpture apart from irregular concentric growth 

 lines. Margin sharp and smooth, convex at the sides and slightly concave at the ends. 

 Interior white, smooth, the horseshoe muscular impression clearly shown. 



Length 37 mm.; breadth 2-45 mm.; height 1-65 mm. (Holotype). 



Habitat: Off Three Kings Islands, St. 934, 92 m. 



This species is allied to both compressa and subcompressa but differs from them in 

 being very little compressed and in having the nucleus central. 



Finlay (1926, Trans. N.Z. Inst., lvii, p. 375) has mentioned the presence of a new 

 species of Tectisumen from this area. 



Family FOSSARIDAE 



Genus Fossarus, Philippi, 1841 



Type (monotypy): Fossarus adansonii, Phil., new name for Le Fossar of Adanson 



= ? Turbo ambiguus, L. 



Fossarus aupouria, n.sp. (Plate XLIX, fig. 12). 



Shell small, thin, subglobose, white, keeled and widely umbilicate. Whorls 3I, 

 rapidly increasing and loosely coiled, including a small smooth protoconch of one 

 whorl, obliquely tilted, the apex immersed. Spire a little less than height of aperture. 

 Sculpture consisting of a few equispaced rather sharp-crested prominent spiral keels, 

 three on the spire whorls and eight on the body whorl, the fourth being at the suture and 

 the remaining four on the base, the last one being at the edge of the umbilicus, which is 

 deep and funnel-shaped, varying from about one-sixth to one-seventh the diameter of 

 the shell. The distance from the suture to the first spiral keel is twice that of the inter- 

 carinate spaces, resulting in a broad flattened shoulder. There is no axial sculpture apart 

 from faint growth lines. Aperture oblique subcircular. Peristome thin, adnate to 

 parietal wall for a very short space. 



