BY C. HEDLEY. 491 



broadening distally, with a large blunt tubercle on its outer 

 edge. Above this is a narrow but deep axial groove. Height 

 4-5 mm.; major diameter 3*75 mm.; minor diameter 3-35 mm. 



Several specimens from 17-20 fathoms. A broken specimen 

 occurred to me off the Hope Islands. 



This seems to be a close ally of C. deception Smith,* from 

 W. Australia, Port Darwin and Albany Island His drawing is 

 too indistinct to use except as a silhouette, but it indicates that 

 the whorls are more angled above and below than in the Mast 

 Head shell. Presuming that the latter are adult, the species is 

 smaller with fewer whorls. A more distant relation is Callios- 

 toma spimdosiwi Tate.f 



Alcyna australis, n.sp. 

 (Plate xviii., fig.29.) 



Shell small, broadly conical. Whorls four and a half, rounded, 

 rapidly increasing. Colour: adult whorls dull white, protoconch 

 dark purple. Sculpture: the base is ornamented with spaced 

 spiral grooves; these occur, but fainter, on the penultimate whorl. 

 The protoconch, embracing two and a half whorls, is more 

 strongly spirally furrowed. Aperture large, round; into it 

 projects from the columella a prominent tooth-like tubercle. 

 Height 25 mm.; breadth 1-45 mm. 



A single rather worn specimen from 17-20 fathoms is the first 

 representative of the genus to be reported from Australia. The 

 contrast in colour and sculpture between the apical and succeeding 

 whorls distinguishes this species. 



ASTRALIUM AUREOLUM, n.sp. 



(Plate xxi., figs.56, 57, 58.) 



Shell large, massive, conical, imperforate; spire elevate, later 

 whorls becoming subscalar. Whorls seven. Colour a uniform 



'■' Smith, Proc. Malacol. Soc. lii. 1899, p. 312, fig.5, and Zool. Coll. Alert, 

 1884, p.72. 

 tTate, Trans. Roy. Soc. S.A. xvii. p. 195, PI. i. fig. 7. 



