REPORT ON THE GASTEROPODA. G69 



12. Cylichna labiata, Watson (PL L. fig. 4). 



Cylichna labiata, "Watson, Prelim. Report, pt. 19, Journ. Linn. Soc. Lond., vol. xvii. p. 324. 

 October G, 1874. Aniboina. 15 to 25 fathoms. 



Shell. — Small, strong, oval, obliquely truncate above, where the apex is impressed, 

 bluntly pointed in front, obscurely angulated above the middle, umbilicate, finely and 

 closely striate, with a thickened lip posteriorly produced. Sculpture: Longitudinals — 

 there are fine, straight, hair-like unequal lines of growth. Spirals — there are fine spiral 

 lines, which at the top and bottom of the shell are a little strong and remote, but in all 

 the centre part are very faint and crowded, and above the middle, where a very blunt 

 angulation occurs, they are nearly invisible. Colour translucent white, with a tinge of 

 brown, which on the outer lip and base is ochreous. Mouth long, curved, narrow, a little 

 enlarged in front. Outer Up rises perpendicularly from the outer edge of the impressed 

 apex, is produced posteriorly, where it bends in toward the apex, and is patulous and 

 almost emarginate ; its direction and edge line are both somewhat flexuous ; in front it is 

 contracted in towards the pillar, forming at the point of the base a narrow, patulous, but 

 not emarginate, gutter ; the edge is sharp, but is strengthened a little way within by a 

 small longitudinal rib, which is of a ruddy white colour. Top obliquely truncate, small, 

 with a blunt keel round the edge of the minute, shallow, conical depression, which is half 

 choked by the outer lip. Inner lip : a very thin glaze extends across the gibbously and 

 convexly curved body ; there is a slight angle at the top of the pillar, which is direct, a 

 little oblique, hardly patulous, scarcely twisted, very narrow, most feebly toothed and 

 truncate in front; behind the sharp edge is a small but deep umbilicus. H. O'lG in. 

 B. 0*09. Mouth, breadth at same place, 0"01. 



This is a very peculiar form, extremely like an Ovida both in shape and in the thickness of the 

 outer lip, the edge of which, however, is sharp. 



13. Cylichna {Volvula) pauper cula, Watson (PI. L. fig. 5). 



Cylichna (Volvula) paupercula, Watson, Prelim. Report, pt. 19, Journ. Linn. Soc. Lond., vol. xvii. 



p. 325. 



Station 24. March 25, 1873. Lat. 18° 38' 30" N., long. 65° 5' 30" W. North of 

 Culebra Island, West Indies. 390 fathoms. Pteropod ooze. 



Shell. — Small, cylindrically oblong, with a short, blunt, but pointed top, white, faintly 

 spiralled. Sculpture : Longitudinals — there are fine close-set lines of growth. Spirals — 

 the whole shell is scored with fine, shallow, remote, scarcely fretted furrows. Colour 

 ivory-white. Mouth arched, narrow above and throughout the greater part of its length, 

 but widening in front, where the body of the shell contracts on the base ; above, it rises 



