506 MOLLUSCA OF MAST HEAD REEF, QUEENSLAND, II., 



narrower, gradate; the earlier together forming a tall and slender 

 column. No sculpture. Umbilicus wide and deep. Aperture 

 semilunate, lip expanded, columellar margin broadly reflected. 

 Height 2-15 mm.; breadth 1-65 mm. 



Three specimens from 17-20 fathoms. I again met with this 

 species in 5-10 fathoms off the Hope Islands. 



EULIMELLA COLUMNA, n.Sp. 



(Plate xviii., fig. 31.) 



Shell minute, long and slender, turreted, terminating obtusely. 

 Whorls seven, plus an inclined heterostrophe protoconch, angled 

 at the periphery, slowly increasing. Colour translucent white. 

 Sculpture: above the angle are no spirals, at and below- it 

 numerous spiral grooves, finer and crowded at the angle, deeper 

 and wider spaced below it. Across these and the smooth belt 

 between the angle and suture run fine flexuous growth-lines. 

 Base rounded, imperforate. Aperture pyriform, outer lip sharp, 

 columella expanded. Height 2-3 mm.; breadth 0-75 mm. 



Numerous specimens from 17-26 fathoms. This species also 

 occurred in 5-10 fathoms off the Hope Islands. 



This is most nearly related to E. anabathro7i Hedley,* from 

 which it is distinguished by the spiral grooves, which appear as 

 opaque lines on a translucent ground. 



Omalaxis radiata, n.sp. 



(Plate XX., figs.53, 54, 55.) 



Shell minute, thin, discoid al, angled above and below; spire 

 slightly raised, umbilicus broad and deep. Colour w^iite. Whorls 

 three, subquadrate in section, last finally detached. Protoconch 

 of one tilted and unsculptured whorl ending in a varix. Sculp- 

 ture: fine, close, lamellate, radial ribs, about 52 on last whorl, 

 crossing the upper and lower angles these thicken and project 



These Proceedings, xxx. 1906, p. 524, pl.xxxiii., figs. 39, 40. 



