GASTEROPODA 219 



with four flattened spiral cords with linear interstices, penultimate with five. Body 

 whorl with nineteen spiral cords, six of which are on the fasciole ; these being narrower. 

 All post-nuclear whorls crossed by moderately strong axial folds, eighteen per whorl, 

 which become obsolete over the base. Aperture narrow, with parallel sides, and a broad 

 open canal below. Outer lip thin, not variced. Inner lip defined as a fairly broad slightly 

 sunken glaze. Columella with two rudimentary plaits. 



Height 5-6 mm. ; diameter 3-1 mm. (Holotype). 



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



This species resembles Mitrithara proles, Hedley (1922, Rec. Aust. Mas., xin, 

 No. 6, p. 236) from 80 fathoms off Narrabeen, New South Wales. 



Family RETUSIDAE 



Genus Retusa, Brown, 1827 



Type (fide Iredale, 1915 and Woodring, 1928): Bulla obtusa, Montagu (= ? plicata, Brown = 

 ? discors, Brown = ? Voluta alba, Kanmacher) 



Retusa aupouria, n.sp. (Plate LV, fig. 7). 



Shell small, ovate-cylindrical, thin, smooth, semi-transparent, glossy, white. Spire 

 deeply sunken, the outer edge of the concavity being defined by a sharp rim. Sides 

 broadly and evenly convex, the last whorl forming the entire height of the shell. Aper- 

 ture as high as the shell, very narrow above, but broadened out below owing to the 

 contraction of the inner lip towards the columella. Inner lip spread as a thin callus over 

 the parietal wall. Columella short, vertical, thickened, with a slight medial twist. 



Height 5-6 mm. ; diameter 2-8 mm. 



Height 5-1 mm.; diameter 2-65 mm. (Holotype). 



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



This species appears to be closely allied to Watson's Utriculus (Tornatina) pachys 

 (Challenger Rep., Zool., xv, p. 660, pi. 49, fig. 8) but is considerably less inflated. Watson's 

 species has the dimensions: height 575 mm., diameter 3-5 mm., compared with height 

 5-6 mm., diameter 2-8 mm. for the shell from Three Kings Islands. Tornatina murdochi, 

 Suter, 1915 (= Cylichna simplex, Murd. and Suter, 1906), from no fathoms off the 

 Great Barrier Island, is still more cylindrical, has the sunken spire concavity smaller, and 

 faint spiral sculpture. 



Class AMPHINEURA 



Family LEPIDOPLEURIDAE 

 Genus Parachiton, Thiele, 1909 

 Type (by monotypy) : Lepidopleurus (Parachiton) acuminatus, Thiele 

 Parachiton textilis, n.sp. (Plate XLVIII, figs. 4, 5, 6). 



Median valves narrow, not beaked, round-backed and high arched, lateral areas very 

 slightly raised ; the sculpture of fine, regular quincuncial punctation, central areas with 



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