248 EEV. E. BOOG WATSON ON THE 



whorls and a somewhat impressed suture. Sculpture. Longitu- 

 dinals — there are a few very minute and faint lines of growth. 

 Spirals — there are a few irregular and very slight transverse 

 angiilations, which are connected with a very subdued and almost 

 invisible malleated surface, which may be seen in a changing 

 lighb. Colour white, probably transparent in fresh specimens ; 

 the surface, which is glassy, is very smooth. Spire conical, but 

 not quite regularly so, being slightly convex in the middle and 

 very faintly concave above and below. Apex, for the genus and 

 relatively to size, blunt, almost slightly tumid, round, but with 

 the faintest conceivable prominence on one side of the extreme 

 tip. Whorls 9, of regular increase, though the last is a little dis- 

 proportionally large, well rounded; the last, which is slightly 

 tumid, has a very faint trace of angulation below the suture and 

 at the edge of the base, which is flatly rounded and projecting, 

 with a slightly thickened and angulated carination round the 

 umbilicus. Suture linear, impressed, and very slightly oblique. 

 Mouth oval, bluntly angulated above, effuse on the base and 

 slightly so on the outer lip. Outer lip is slightly pinched in at 

 its union with the body ; from this point it runs out to the right 

 with a free curve, but, speedily turning to the left, its course is 

 straight, and here it is prominent, and it becomes increasingly 

 patulous as it curves quickly round to join the pillar. Pillar is 

 not at all oblique, but is slightly concave. Inner lip crosses the 

 body on a thin but sharply-edged pad ; it is thin, sharp, and 

 scarcely patulous on the front of the pillar. Umbilicus : there is 

 a small funnel-shaped trough between the pillar-lip and the an- 

 gulated edge of the base, but this contracts immediately to a 

 mere chink. H. 0153. B. 0-053. Penultimate whorl, height 

 0026. Mouth, height 0-039, breadth 0'03. 



This species is like A. Walleri, Jeffr., but certainly distinct; 

 the shell is broader, the whorls, which are fewer (9 instead of 

 11), are rounder, being less flattened, constricted above and less 

 bulgy below, the spire, which is less regularly conical, is not so 

 attenuated, the apex is not nearly so fine, and the surface of the 

 shell is smoother, the longitudinals being less visible, while the 

 malleated structure, which also exists in A. Walleri, is here even 

 less visible. 



Fenella, A. Ad. 



I have put this genus here rather for convenience than from 



