426 BEV. B. BOOG WATSON ON THE 



the whorls contract gradually downwards till just at the lower 

 suture, where there is a very slight sudden constriction. The last 

 whorl is small, contracting from the keel, with a pinch in toward 

 the point at the base, which is produced into a narrow, slightly 

 elongated, triangular snout. Suture : there is a small narrow de- 

 pression in the bottom of the open constriction of the whorls. 

 Mouth oblique, narrow, pear-shaped, slightly angulated above, 

 and produced below into a narrow canal. Outer lip thin and 

 sharp, but strengthened by a remote, rather prominent though 

 narrow labral varix : it is only slightly curved on the pro- 

 file of the shell ; but the lip-edge advances in a very high pro- 

 minent shoulder, between which and the body lies the narrow, 

 rounded, gutter-like sinus, with a prominent reverted outer edge 

 all round. Inner lip slightly thickened above ; it is thin on the 

 body, but is thicker again on the pillar, on which it advances very 

 direct, with a slightly raised edge, but does not reach the point of 

 the shell, the pillar being cut off with a long, oblique, narrow, 

 twisted edge, which advances along the side of the canal beyond 

 the thin callus of the pillar. H. 0*57. B. 0*21. Penultimate 

 whorl, height 0-09. Mouth, height 025, breadth 0*8. 



This species considerably resembles P. amosna, E. Sra., from 

 New Zealand ; but that species has not so scalar a spire, its base 

 and canal are longer, and its apex is blunt. 



28. Pleubotoma (Deillia) stebeha, n. sp. (areppos, solid.) 



Sept. 8, 1874. Flinders Passage, off Cape York, Torres Strait. 

 7 fms. 



Sept. 8, 1874. Cape York, off Albany Island. 3-12 fms. 



Shell. — Very strong, high, narrow, conical, with a subcorneal 

 base, strongish, rather crowded ribs, and small spiral threads, varie- 

 gated in colour. Sculpture. Longitudinals — the whorls are crossed 

 by rather straight ribs, which are rather strong than high ; they 

 extend to the base, but not to the snout ; they are dislocated at 

 the top, and are not continuous from whorl to whorl : there are 

 about twelve on the last two whorls ; but they diminish rapidly in 

 number up the spire : every here and there one becomes some- 

 what varicose ; on the base they become flexuous, and tend to 

 bifurcate ; they are parted by narrow and shallow furrows : the 

 lines of growth are fine and crowded, but on the top of the ribs 

 they tend to cut the surface into coarsish tubercles. Spirals — 

 below the suture is a broadish but superficial constriction, which is 



