REPORT ON THE GASTEROPODA. 471 



regular curve into the superior suture. The first 6 or 7 whorls are markedly smaller 

 than those which follow. The base is round and rather prominent. Suture fine, but 

 strongly marked by the contraction above and below. Mouth rather small, round. Outer 

 Up slightly advancing on the edge of the base, somewhat open, very slightly angulated at 

 the lower outer corner, a very little flattened on the base, patulous, and a little angulated 

 at the point of the pillar. Inner lip crosses the body and coils round the base of the 

 pillar as a very thin glaze. Pillar a little oblique, curved, patulous, sharp, and with a 

 distinct twist on the edge. Epidermis very distinct, thin, membranaceous, and marked 

 with the fine generic spiral lines ; it is very caducous. In drying it seems to have risen 

 through contraction, so as to remain attached to the summit of the spirals, while it 

 stretches across the intervening furrows. Operculum small, darkish brown, of very many 

 flanged whorls. H. 0*8 in. B. 0*25, least 0'21. Penultimate whorl, height (P12. 

 Mouth, height 0'18, breadth 0-15. 



This species is very like our British Turritella tercbra, Linne, but is stumpier in form, smaller, 

 with a much more impressed suture, and fewer spiral threads. Than Turritclla hookcri, Reeve, 

 Antarctic Expedition, this is also much stumpier, the apex is rounder and blunter, and the suture is 

 deeper. Than Turritclla, pagoda, Reeve, from which it also differs in form and suture, it is distin- 

 guished by a finer apex, and in that the second spiral thread is much weaker than in the Challenger 

 species. Than Turritclla Icnysnacnsis, Krauss, it differs in being stumpier, with a finer drawn and 

 yet at last abrupter apex. It extremely resembles Turritclla duplicata, Linne, but in form is stumpier, 

 and the spiral threads are fewer. Tiirritella triplicata, Broc, has also more strong, and very many 

 more fine, spirals. 



11. Turritella deliciosa, Watson (Plate XXIX. fig. 3). 



Turritella deliciosa, Watson, Prelim. Report, pt. 6, Journ. Linn. Soc. Lond., vol. xv. p. 226. 



Station 185b. August 31, 1874. Lat. 11° 38' 15" S., long. 143° 59' 38" E. Raine 

 Island, Cape York, North Australia. 155 fathoms. Coral sand. 



Shell. — Conical, porcellanous glossy white, with bicarinated contracted whorls and 

 impressed suture, rounded base, blunt rounded and slightly tumid apex. Sculpture : 

 Longitudinals — there are very many, irregular, close-set, fine, strongly curved lines of 

 growth, which preserve the curve of the labial sinus. Spirals — each whorl is carinated 

 by two strong, broad, rounded threads, of which the lower lies about one-fourth of the 

 height of the whorl above the inferior suture, while the upper is slightly nearer the 

 superior suture. Close above each is a minute thread which is like the shadow of the 

 others. Between the two keels the surface of the whorl is impressed by a broad, shallow, 

 rounded furrow, in the bottom of which is a spiral thread intermediate in strength 

 between the keels and their shadows. On the base there are about nine small spiral 

 threads, the innermost of which are feebler than the rest ; they are parted by slight shal- 



