476 THE VOYAGE OF H.M.S. CHALLENGER. 



follow; all the earlier whorls are distinctly convex. Suture fine, but distinct. Mouth 

 rather small, almost square, but a little higher than it is broad. Outer lip very straight, 

 roundly angulated below, patulous and almost canaliculate at the pillar-point ; it advances 

 a good deal at its junction with the preceding whorl, from which point it retreats so as to 

 form a very deep and narrow sinus, the upper edge of which lies along the upper carina, 

 and whose apex occupies the depression between the upper and lower carina. The lower 

 edge of this sinus advances in a line much more oblique than its upper edge, which is 

 almost parallel to the suture ; it is the deep curve of this sinus which bends the lines of 

 growth into so strong a curve as they cross the whorls. Inner Up is spread across the 

 body as a thin glaze ; it thickens a little toward the base of the pillar, round and behind 

 which it spreads, so as to leave a minute umbilical pore. Pillar is very straight in the 

 line of the axis, but is bent backwards more than is usual in the genus ; its edge is narrow, 

 rounded above, with a brilliant milky glaze, slightly reverted and sharp below, and ending 

 in a fine point. H. L25 in. B. 0-4, least 0*38. Penultimate whorl, height 0'18. 

 Mouth, height 0*28, breadth 0*22. 



This resembles the Turritella sinuata, Eeeve ; but in that the apex is much finer, the earlier 

 sutures much shallower, and the whorls of much slower increase. It is extremely like some specimens 

 in the British Museum, on a tablet numbered " 906. Bass Strait," and on the back of ^which there is 

 written " 45 fms., coarse sand and dead shells ; " but they are, I think, distinct. In many respects 

 it recalls the well-known Mediterranean and Atlantic species Turritella triplicata, Broc. ; but it is a 

 smaller and more delicate species than that, and the finer spiral sculpture is very much more delicate 

 and irregular. 



15. Turritella accisa, Watson (PI. XXX. fig. 4). 



Turritella accisa, Watson, Prelim. Report, pt. 6, Journ. Linn. Soc. Lond., voL xv. p. 220. ] 



Station 162. April 2, 1874. Lat. 39° 10' 30" S., long. 146° 37' E. Off East Mon- 

 cceur Island, Bass Strait. 38 to 40 fathoms. Sand and shells. 



Shell. — Subulate, a very little contracted at the edge of the flattish and little conical 

 base, thinnish, speckled, with a strongly furrowed suture, on the lip a deep sharp sinus. 

 Sculpture : The surface is closely covered with very fine sharp scratches on 

 the highly curved lines of growth, which are specially crisp on the base, 

 where they are flexuous and unbroken. Spirals — there are on the last whorl 

 two keels, one near (about 0'04 in. from) the top, the other a little fur- 



La,bral sinus of v ' i 



TurrUeiia accisa, ther (about 0"05 in.) from the bottom of the whorl : both are blunt roundly 

 swollen bands defined by the sutural contraction, but the upper one is 

 slightly the sharper ; the under one is the stronger and better defined, the sutural 

 contraction below it being more abrupt instead of presenting the mere sloping shoulder 

 which lies between the upper band and the suture. Between these two carinations the 

 slightly impressed surface is scored by several threads and furrows, of which sometimes 



