118 EEV. K. BOOG WATSON ON THE 



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 the situation 

 is strongly denned by the suprasutural 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 

 rounded. Inner lip a thin glaze on the body, but with a dis- 

 tinct edge, which is slightly thickened toward the point of the 

 pillar. H. 0-21. B. 0-084. Penultimate whorl, height 0035. 

 Mouth, length 0-06, breadth 0'047. 



The peculiar semi-imbricated growth of the whorls in this 

 species recalls somewhat the curious C. dubium, Sow. ; but the 

 species differ obviously in size, form, and sculpture. 



18. Cerithium (Bittittm) ctlindeicum, n. sp. 



April 17-18, 1874. Port Jackson, Sydney. 2-10 fms. 



Shell. — Small, high, narrow, pointed, cylindrically conical, reti- 

 culate, tubercled, strong, dark brown. Sculpture. Longitudinals — 

 there are on the last wdiorl about 25 narrow, posteriorly convex, 

 curved riblets, which cannot be followed from whorl to whorl 

 down the spire, and which hardly appear on the base amidst the 

 strong curved lines of growth found there. These riblets are 

 parted by squarish furrows about as broad as themselves. Spirals 

 — there are on each whorl three pretty equal, squarish, not much 

 prominent, spiral threads, which become prominent themselves 

 and give prominence to the longitudinals by expanding into 

 round-topped tubercles as they cross the riblets ; they are parted 

 by furrows, which are of about the same breadth as themselves ; 

 the sutural furrow is slightly deeper and broader than the others. 

 The edge of the base is squarish, and is denned by a narrow 

 sharpish-edged spiral thread. The base, which is flatly conical, 

 is plain but for the lines of growth ; the pillar is denned by a 

 minute, sharpish spiral thread, which runs round its base and 

 meets the slit of the canal. Besides these the whole surface of 



