EEPOET ON THE GASTEROPODA. 329 



This singularly beautiful species is a form very difficult to connect with any of the groups of 

 Plmrotoma. Its texture connects it with Clavus, to some of the less characteristic forms of which 

 it approaches pretty closely, but it has neither the apex nor the thickened labium of the Drillias. 

 Though I have put it with the Perronas, it does not really belong to that group, its sinus being 

 far too near the suture. Compared, as regards its form, with Plmrotoma sacra, Reeve, which in a 

 superficial way it resembles, it has no approach to an umbilical chink ; the body is broader, the base 

 more contracted, the spire more regularly conical and not at all convex ; the individual whorls are 

 much shorter, the sinus much shallower ; the colour is pure white, not brown-banded ; and the 

 sculpture is deeper and less superficial. 



59. Pleurotoma (TJiesbia) eritima, 1 Watson (PI. XXIII. fig. 2). 



Pleurotoma (TJiesbia) eritima, Watson, Prelim. Eeport, pt. 9, Journ. Linn. Soc. Lond., vol. xv. 



p. 443. 



Station 135c. October 17, 1873. Off Nightingale Island, Tristan da Cunha. 100 to 

 150 fathoms. 



Shell. — Very small, but hardly thin, oblong, spirally striated, with a long body-whorl, 

 a rather high conical spire, a blunt round-pointed apex, and a short broad truncated snout. 

 Sculpture: Longitudinals — there are exceedingly faint scratches in the lines of growth. 

 Spirals — the whole surface is scored with fine narrow impressed furrows, which are about 

 half the width of the raised interstices. Colour uniform pellucid ruddy brown, becoming 

 paler towards the point of the snout. Spire rather high, but not small, conical, but with 

 convex profile-lines. Apex : 2 ^ embryonic whorls, which rise in a conically globose form to 

 a blunt rounded point with the very small tip, which is immersed and bent down on one 

 side. Whorls 5, slightly convex, rather short and broad except the last, which is long 

 and narrow, having a produced, broad, and conical base, ending in a broad undefined 

 snout. Suture very slightly impressed in consequence of a faint swelling of the superior 

 and inferior whorls. Mouth oblong, pointed above, and broadly truncate below, at the 

 end of the scarcely contracted canal. Outer lip, which is a little contracted above and a 

 little patulous below, is a flat curve in both its planes ; the edge projects into a small 

 high-placed shoulder, between which and the body lies the shallow, open, rounded sinus, 

 with a very minute, short, triangular shelf above it. Inner lip : there is a thin narrow 

 glaze on the body and pillar ; at the junction of these two there is a very slight concave 

 curve ; otherwise the line is very direct and is slightly oblique ; the glaze does not extend 

 quite to the point of the pillar, which is scarcely twisted or truncated. H. 0'12 in. 

 B. 0-049. Penultimate whorl, height 0'03. Mouth, height 0-06, breadth 0-024. 



1 tPiri/iOf, very precious. 



(ZOOL. CHALL. EXP. — PART XLII. — 1S85.) , Tt 42 



