BY C. HEDLEY. 497 



of the remainder. Colour white, pink on the summit and round 

 the mouth. Sculpture: the first whorl is acutely angled at the 

 shoulder; from that angle is evolved a strong projecting peri- 

 pheral keel descending and enlarging till it merges in the varix. 

 The base carries a lesser keel, reappearing as a thread above the 

 suture of the last whorl. Fine microscopic spiral striae overrun 

 the whole surface. Aperture obliquely oval, surrounded by a 

 broad and thick varix. Height r95mm.; breadth 085 mm. 



Numerous specimens dredged in 17-20 fathoms. 



From A. contabidatum the novelty is clearly distinguished by 

 colour, greater bulk, and the massive spiral keel. 



ScALiOLA BELLA A. Adams. 



A. Adams, Ann. Mag. Nat. Hist. (3) vi. 1860, p.l20; Watson, 

 Chall. Rep. Zool. xv. 1886, p.623. 



This species occurred with, but in less abundance than, S. 

 arenosa and S. caledonica. On revising the group with m@re 

 material and knowledge, I would now withdraw my S. lajjillifera^ 

 from the Ellice Islands, as a synonym of S. hella. I have also 

 obtained this species at Green Island near Cairns, and off the 

 Hope Islands. 



RiSSOINA KESTEVENI, n.sp. 



(Plate xvii., fig. 25.) 



Shell small, massive, ovate. Whorls five, gradate. Colour 

 white. Sculpture : the first two whorls smooth, prominent; 

 widely spaced arcuate radial ribs, numbering 17 on the last 

 whorl, ascend the spire continuously and obliquely, rise into 

 nodules on the shoulder and descend tapering in a sigmoid 

 flexure on the base. A double peripheral girdle breaks the ribs 

 into beads; midway down the base another spiral chain of beads 

 occurs. A secondary microscopic sculpture of fine, distant, spiral 

 threads overruns the whole surface. Aperture ovate, a little 

 effuse anteriorly. Height 3*25 mm.; breadth 2*25 mm. 



Hedley, Mem. Austr. Mus. ill. 1899, p. 41 5, fig. 8 



