MOIiLTTSCA OV THE ' CHALLENGER ' EXPEDITION. 327 



1. UtEICXTLUS (ToeNATINA) LEPTEKES, n. Sp. (XeTTTrjuijs, 



fine-pointed.) 



St. 185 h. August 31, 1874. Lat. 11° 38' 15" S., long. 143° 

 59' 38" E. Eain Island, Cape Tork, N. Australia. 155 fms. 

 Sand, shells. 



Shell. — Eather small, thin, oblong, cylindrical, rounded on the 

 shoulder, very fine-pointed, with sinistral upturned apex^, narrowed 

 in front, spirally striate, with long, narrow, slowly widening 

 mouth. Sculpture. Longitudinals — the lines of growth are very 

 slight and regular. Spirals — ^the whole surface is scored with 

 sharp-cut fine furrows, which are about half the width of the 

 interstices ; round the top of the whorls runs a slight but sharp- 

 edged axial keel. Colour almost hyaline white from the extreme 

 thinness of the shell. Mouth a little shorter than the shell, very 

 elongately and slightly curvedly pear-shaped, rather narrow above 

 and there channelled. Whorls 3, besides 1| in the sinistral 

 embryonic apex. Outer lip very gently curved ; its edge-line 

 retreats very much above and in front. Top : there is a very 

 short scalar spire, in which the first regular whorl is elevated and 

 is truncately conical, the second hardly shows above the third ; 

 ia the middle rises the small sinistral, more than' half-turned-over 

 apex ; the sutural canaliculation is a shallow rounded furrow, 

 with a sharp-edged external border carinating the whorls. Inner 

 lip : there is a thin but distinct labial pad ; the curve of the body 

 is convex, and contracts slowly from the top of the mouth to the 

 front, which is not truncated : the pillar is long, oblique, with a 

 small reverted lip and a very slight long-twisted tooth, behind 

 which is a feeble furrow, caused by an impression made in the 

 shell. L. 0-14. B. 0-06. B. of mouth at same place, 0-02. 



This species diflers from Z7. acroieles, Wats., in its narrower form 

 and thinner texture, in its sculpture, in its larger mouth, in its 

 spire, its sutural canaliculation, and its apex, which is more 

 prominent. 



2. UtEICULTJS (ToENATINA) ACEOBELES, n. sp. (aKpojSeXr'is, 



ending in a point.) 



Shell. — Bather small, spirally scored, oval, subcylindrical, 

 bluntly rounded in front, with a low subscalar spire crowned 

 with a minute prominent sinistral apex turned up on its side. 

 Sculpture. Longitudinals — there are faiut growth-furrows drawn 

 at the top into short very oblique folds. Spirals — the whole 



