238 THE VOYAGE OF H.M.S. CHALLENGER 



projects ; a little way below the suture the edge is drawn back, so as to form a very slight 

 open false sinus. Inner lip : there is a thin glaze on the body where the line is very 

 straight, as it is also down the pillar, where the glaze (without teeth) forms a thickish 

 prominent border ; this border is early cut off on the sharp oblique twisted edge of 

 the pillar in front ; the pillar is short and straight, with a slightly bent-over point. 

 H. 0*4 in. B. 0-15. Penultimate whorl, height 0-08. Mouth, height - 13, breadth 0-07. 



The variety subacta has less developed and less regular ribs, is a little longer and smaller, and has 

 a very slightly larger apex. 



This species is closely connected with the group represented on our coasts by Columbclla haliceeti, 

 Jeffr., and of which Binney, in his edition of Gould's Moll, of Massachusetts, gives several species. 

 It is, however, very markedly different from all of these. 



11. Columbella (Pyrene) stricta, Watson (PI. XIII. fig. 3). 



Columbella {Pyrene) stricta, Watson, Prelim. Report, pt. 12, Journ. Linn. Soc. Lond., vol. xvi. p. 340. 



Station 24. March 25, 1873. Lat. 18° 38' 30" N v long. 65° 5' 30" W. Off Culebra 

 Island, West Indies. 390 fathoms. Pteropod ooze. 



SJiell. — Small, short, and dumpy, with a rather high, scalar, blunt spire, a short but 

 broadish last whorl, a very contracted base, and a small slightly reverted snout ; the 

 whorls are longitudinally chamfered, have a small keel round the top, and rather broad 

 spiral threads. Sculpture: Longitudinals — there are on the last whorl about 12 low, 

 ridge-shaped, straight ribs, which are not continuous from whorl to whorl, but increase 

 rapidly in number up the spire ; they are parted by furrows about three times their 

 width ; the last one, which is remote from the edge of the lip, is varicose ; they become 

 obsolete towards the point of the base. Spirals — below the suture are two well-marked 

 furrows interrupted by the ribs and parted by a strongish thread, which forms a keel, and 

 rises on the ribs into little tubercles : below this the whorls are more or less obsoletely 

 scored by broad flat threads ; these on the base and pillar are very distinct, though narrow, 

 and are parted by broad, shallow, square-cut furrows. Colour: smooth, porcellanous 

 white. Spire rather high, scalar, conical. Apex a blunt, round, smooth, glossy dome of 

 \\ embryonic whorls, whose tip is both immersed and flattened down, with a scarcely 

 perceptible suture. Whorls 6, cylindrical, scarcely convex, angulated and flatly shouldered 

 at the top ; the last is short, slightly tumid, with a rapidly contracted base, from which 

 projects the short, broad, conical, abruptly truncated snout. Suture angular and well 

 marked by the projection of the shoulder below it. Mouth small, short, but broadish, 

 angulated above, obliquely prolonged below into the square, open, slightly reverted canal. 

 Outer lip contracted and very slightly curved above, very patulous where the bend comes, 

 and below this direct and oblique ; it has about 10 small teeth within, of which the highest 

 is remote from the top, and is larger than the others ; just at this point is a slight open 



