REPORT ON THE GASTEROPODA. 321 



quite died out, and even the angulation of the whorl tends to disappear. There are faint 

 traces of microscopic spirals over the whole shell, rather in the texture than on the sur- 

 face ; these are rather more distinct below the suture ; and in the sinus-area there are 

 two faint impressed lines. Colour polished ivory-white. Spire high, narrow, conical. 

 Apex: the 2^ embryonic whorls are cylindrical, quite smooth, and have the extreme 

 point very much flattened down on one side so as to make a perfectly rounded tip. 

 Whorls 11^ in all; they are rather short, and of very regular increase, slightly convex, 

 but not contracted either above or below ; the last is very slightly tumid with a rounded 

 base, contracting very rapidly to a short broad snout, which is abruptly truncated at the 

 point. Suture rather oblique, fine, regular, defined by a slight impression : it rises a very 

 little at the mouth. Mouth pear-shaped, small, narrow, little contracted in front. Outer 

 lip somewhat thickened, with a small reverted edge in the sinus and at the point of the 

 canal, but sharp and a little contracted in all the rest of its extent ; it leaves the body at 

 a slightly acute angle, and retreats at once obliquely, but very shortly, to form the 

 narrow rounded sinus, from which, almost parallel to the line of the suture {i.e., with 

 a very slight oblique direction forwards), it sweeps far out in a great convex-edged 

 wing, retreating again a little to the edge of the very short canal, where it turns 

 slightly and obliquely forwards ; the point of the canal is open, and cut off obliquely 

 from the right forwards to the point of the pillar. Inner lip : a thin porcellanous glaze, 

 a little thickened at the top, spreads narrowly on the body, which is a good deal exca- 

 vated ; the pillar is straight, short, conical, very little truncated, with a slightly twisted 

 and sharpish edge, and a pretty solid though fine point at the extreme front of the shell. 

 H. 0-65 in. B. 0-23. Penultimate whorl, height 0*1. Mouth, height 0'22; breadth O'l. 



In style of ornamentation this singularly beautiful species somewhat resembles Plcurotoma syn- 

 genes, Wats. ; but the differences are so obvious as not to need mention. I do not know any species 

 with which to compare it. Plcurotoma modiolus, Jan (Fusus) = Plcurotoma carinata, Biv. has some 

 resemblance; but that is a coarser and broader shell, and has the mouth much larger. 



51. Plcurotoma (Typhlomangelia) lincta, Watson (PI. XXII. fig. 11). 



Pleurotoma (Rhaphitoma) lincta, "Watson, Prelim. Report, pt. 9, Journ. Linn. Soc. Lond., vol. xv. 



p. 442. 



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

 Island, West Indies. 390 fathoms. Pteropod ooze. 



Shell. — High, narrow, conical, with a blunt round apex, and a short and very con- 

 tracted base, ribbed, polished ivory-white. Sculpture: Longitudinals — there are on the 

 last whorl 11, on the first 9, very short ribs (or elongated tubercles) which do not extend 

 to either suture ; they are rounded on the top, are parted by broad rounded furrows, and 



(ZOOL. CHALL. EXP. PART XLII. 1885.) Tt 41 



