GASTEROPODA 211 



Family EULIMIDAE 



Genus Balcis, Leach, 1847 



( = Eulima, Auct.) 

 Type (Winckworth, 1934): Balcis montagui=B. alba (da Costa) 



Balcis bollonsi, n.sp. (Plate LIV, figs. 11, 12). 



Shell small, smooth, white, very slender, tapering to a small globular protoconch, not 

 clearly marked from later whorls. Whorls seven. Spire z\ times height of aperture, 

 outline of whorls perfectly straight; suture barely distinguishable. The spire has a 

 fairly considerable double or spiral twist. Aperture narrowly pyriform. Outer lip thin 

 and slightly retractive towards suture. 



Height 2-8 mm. ; diameter 07 mm. 



Habitat: North of the North Cape, New Zealand, in 75 fathoms (dredged by the late 

 Captain J. Bollons). 



Holotype: In writer's collection, Auckland Museum. 



Balcis aupouria, n.sp. (Plate LIV, fig. 10). 



Shell small, smooth, translucent, white, highly polished, allied to the last species but 

 not nearly so slender, nor is the spire so twisted. Whorls seven, including a rather blunt 

 dome-shaped protoconch. Aperture narrowly pyriform. Outer lip strongly convex 

 medially, in profile. 



Height 375 mm. ; diameter 1-2 mm. 



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



Family MITRIDAE 



Genus Egestas, Finlay, 1926 



Type (original designation) : Vexillum waitei, Suter 



Egestas dissimilis, n.sp. (Plate LV, fig. 8). 



Shell small, moderately solid, ovoid-biconic, white; spire a little less than height of 

 aperture. Whorls 3I, including a large dome-shaped smooth protoconch of ih whorls, 

 the tip tilted and immersed. Sculpture of numerous weak axial folds and subobsolete 

 fine spiral threads, about eight of which can be seen with difficulty on and immediately 

 above the fasciole and neck. The axials number about twenty-two on the last whorl. 

 Aperture small, narrow. Outer lip thin, sharp and evenly arcuate. Canal open, very 

 short and weakly notched. Parietal wall not excavated, bearing medially three strong 

 oblique plaits. Fasciole very weakly defined. 



Height 2-8 mm.; diameter 1-45 mm. (Holotype). 



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



This species is not a typical Egestas but may be placed here provisionally for want of 

 a better location. It agrees with the genus in having three columellar plaits, and the 

 protoconch is similar, but the style of sculpture and short canal are not typical. 



