REPORT ON THE GASTEROPODA. 313 



all ; they are short, broad, of slow increase, with a rather long sloping shoulder and a 

 sharp carinated angle, below which they are cylindrical, with a very slight contraction to 

 the suture ; the last is broadest at the keel, and from this point convexly contracted to 

 the rather short, broadish, conical snout. Suture linear, but well marked by the contrac- 

 tion of the whorls. Mouth rather large, rhomboidally pear-shaped, with three angles 

 above, and prolonged below into a wide open canal. Outer lip thin, angulated, recti- 

 linear above to the keel, flatly curved below ; on leaving the body it at once retreats, 

 forming in the shoulder a shallow, open, rounded sinus ; below the angle it advances very 

 little ; and at the snout its retreat is slight. Inner lip : there is a thin narrow glaze on 

 the body and pillar ; at the base of the pillar is a slight rounded angle : the pillar is short, 

 conical, and straight ; its point is very slight truncate, with a narrow, rounded, but 

 scarcely twisted edge. H. 0"24 in. B. 0'117. Penultimate whorl, height 0"04. Mouth, 

 height 0-12, breadth 0-06. 



This shell may very likely be immature. The external lip in Pleurotoma is generally so thin 

 that it is difficult to determine from it when the shell is full-grown. 



44. Pleurotoma (Bela) phceacra, 1 Watson (PI. XXI. fig. 5). 



Pleurotoma (Drillia) phceacra, Watson, Prelim. Report, pt. 9, Journ. Linn. Soc. Lond., voL xv. p. 423. 



Station 122. September 10, 1873. Lat. 9° 5' S., long. 34° 50' W. Off Pernam- 

 buco. 350 fathoms. Red mud. 



Shell. — High, conical, angulated, tubcrcled, thin, polished, glassy, with a blunt, dun 

 apex, a contracted base, and a longish pillar. Sculpture : Longitudinals — there is no 

 other longitudinal sculpture than the fine scratch-like lines of growth. Spirals — toward 

 the bottom of each whorl is a row of about twelve round, blunt-tipped, rather prominent 

 tubercles, which form an angulated keel where otherwise there is no carination ; there is 

 also a slight blunt keel round the base : the surface is covered with very obsolete, 

 rounded, flat threads. Colour polished glassy white, with a hyaline dun apex. Spire 

 high, rather narrow, conical ; its profile-lines little interrupted by the carinal tubercles. 

 Apex : there are about two glossy, dun-coloured, globose, embryonic whorls ; the extreme 

 tip is rounded and slightly bent down on one side. Whorls 6, short, and of slow growth, 

 with a longish, drooping, somewhat concave shoulder, angulated below the middle by the 

 row of tubercles, and slightly contracted into the inferior suture. The base, which is a 

 good deal contracted, is conical, and runs out into a fine longish snout. Mouth club- 

 shaped, being somewhat pointedly rhomboidal above, with a longish canal below. Outer 

 lip thin, with a pretty regular convex curve, which is flattened at the summit, and 

 prolonged in a straightish line at the canal ; on leaving the body it retreats at once, 

 leaving a very small shelf above the sinus, which is shaped like an open U with 



1 pa/axcof, dun-tipped. 



(zOOh. CHALL. EXP. — FART XLII. 1SS5.) Tt 40 



