REPORT ON THE GASTEROPODA. 657 



elevated and is truncately conical, the second hardly shows above the third ; in the 

 middle rises the small sinistral, more than half -turned-over apex ; the sutural canalicula- 

 tion is a shallow rounded furrow, with a sharp-edged external border carinating the 

 whorls. Inner Up : 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 trun- 

 cated ; 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. H. 0'14 

 in. B. O'OO. Mouth, breadth at same place, - 02. 



This species differs from Utriculus acrobeles, Watson, 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. 



15. Utriculus (Tomatina) acrobeles? Watson (PI. XLIX. fig. 4). 



Utriculus (Tomatina) acrobeles, Watson, Prelim. Report, pt. 20, Journ. Linn. Soc. Lond., voL xvii. 



p. 327. 



Station 186. September 8, 1874. Lat. 10° 30' S., long. 142° 18' E. Wednesday 

 Island, Cape York, North-east Australia. 8 fathoms. Coral mud. 



Shell. — Eather 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 faint growth-furrows^drawn at the top into 

 short very oblique folds. Spirals — the whole surface is scored with fine furrows, which 

 are remote above but closer in front, where the intervening surface is rounded ; a rounded 

 keel lies below the suture. Colour translucent white. Mouth markedly shorter than the 

 shell, straightish, clavate to pear-shaped, narrow and channelled above. Whorls 4, 

 exclusive of 1^ of the apex which is sinistral. Outer lip straight, very slightly 

 appressed above, where it is separated from the body by the slight shallow sutural canal. 

 Top: there is a short distinct subscalar spire, in which the first regular whorl hardly 

 shows, but which is crowned with the small sinistral half-turned-over apex. Inner lip : 

 there is a thin but distinct labial pad ; the curve of the body is nearly straight, but is 

 convex in front ; the pillar is very oblique, broad, flat and patulous, with a very broad, 

 scarcely twisted tooth, which is longitudinally furrowed so as almost to be double : in 

 front of this tooth the pillar is truncated at its junction, with the outer lip. H. 0*13 in. 

 B. 0'055. Mouth, breadth at same place, 0'014. 



This species differs from Utriculus avenarius, Watson, in the shape of the shell and of the spire, 

 and in the apex and pillar. Utriculus canaliculatus (Say), is much stumpier, and has a lower spire. 

 The upturned apex is like that of Odostomia lactca (Linne). 



1 a.x.oofiihr,s, ending in a point. 



(ZOOL. CHALL. EXP. — PART XLII. 1885.) Tt 83 



