REPORT ON THE GASTEROPODA. 549 



Shell. — Small, broadish, conical, pointed, thin, brownish grey, with white and brown 

 spots, whorls carinated, semi-imbricated, corrugated longitudinally, not reticulated, tuber- 

 cled, variced. Sculpture: Longitudinals — there are on the penultimate whorl 13 depressed 

 rounded, slightly oblique ribs or corrugations, parted by furrows, shallow, rounded, and 

 narrower than the ribs. These ribs diminish in number upwards on the spire, down 

 which they run from whorl to whorl, with a slight oblique twist from left to right. On 

 the last whorl one of these is strengthened into a feeble varix, but the rest become in- 

 creasingly inconspicuous, and at last scarcely recognisable ; on the base they are still 

 traceable as faint corrugations. Spirals — each whorl, at about one-fourth of its height 

 from the suture, projects in an angular carination, which carries a small, but distinct 

 rounded thread, rising; into transverse tubercles where it crosses the longitudinal corruwa- 

 tions. Above this carinal thread there are four very small flat spiral threads, equal, and 

 equally parted by three small furrows, in each of which lies a minute spiral thread. The 

 furrow which separates the lowest of these four spirals from the carinal thread is plain, 

 having no minute spiral in it. Below the carinal angulation the whorls are constricted. 

 Within this constriction there are on each whorl two small alternating furrows and 

 threads, then a comparatively broad and deep furrow, below which a small spiral thread 

 lies immediately at the suture, but above it. It is this supra-sutural thread which forms 

 the edge of the base, and is there nearly as strong as the carinal thread. Its inner side 

 is defined by a strongish farrow, within which the whole base to the point of the pillar is 

 covered with small alternating threads and furrows, in number about 9, of which the first 

 and the fifth thread are a little stronger than the rest. Besides these, the whole surface 

 is microscopically covered with sharpish spirals and slight lines of growth. These last 

 are very distinct toward the point of the pillar. Colour brownish grey, with porcel- 

 lanous white spots where the spirals cross the corrugations, and with a good deal of 

 suffused ruddy brown, especially on the base and about the suture ; the edge of the pillar 

 is deeply tinged with this colour. Spire pointed, conical, with straight profile lines, 

 angulated by the pagoda-like projections of the whorls at the carina, and their con- 

 strictions below this into the suture. Apex small and rounded. Whorls 11, of very 

 gradual and regular increase, straight on the side, contracted upwards into the suture, and 

 overhung by the projection of the preceding whorl above. The base is conical and very 

 slightly concave. Suture invisible, though its situation is strongly defined by the supra- 

 sutural furrows. Mouth rather large, oval, bluntly pointed at the upper outer corner, and 

 with a small open canal beyond the point of the pillar. Outer lip thin, corrugated, 

 slightly expanded above, extremely patulous and projecting on the whole base, slightly 

 pinched in at the side of the canal, advancing markedly beyond the point of the pillar, 

 with a patulous and very slightly reverted sharp edge round the canal. Pillar straight, 

 prominent, rounded, not short, but not projecting so far as the outer lip ; its edge is 

 finely rounded, but not sharp ; its point is cut off quite straight, transversely, and is 



