436 BEV. E. BOOG WATSON ON THE 



shoulder they are straight, with only a slight curve on the base ; 

 they die out on the snout ; they are narrow and rounded, and are 

 parted by rounded furrows of three times their breadth : the 

 whole surface is also fretted with sharp minute lines of growth. 

 Spirals — there is a straight, slightly drooping shoulder below the 

 suture ; this ends above the middle of the whorl in a distinct an- 

 gulation defined by a fine thread, which rises into small, sharp, 

 rounded tubercles as it crosses the ribs. On the penultimate 

 whorl a finer thread begins to appear in the inferior suture, but 

 gradually rises above it ; it is from this lower spiral that the con- 

 traction of the base begins : on the base are 3 or 4 finer spirals 

 parted by spaces about four times their width ; then follow several 

 weaker crowded spirals, then one stronger and more prominent ; 

 all these rise into small tubercles on crossing the ribs : beyond 

 the end of the ribs, on the snout, are some 6 fine distinct threads. 

 The whole surface between these is closely covered with very fine 

 spiral threads, which on all the longitudinal lines of growth are 

 beset with most orderly and regular microscopic blunt prickles, 

 which give the coral-like aspect to the surface. Co lour white ; the 

 tip alone is smooth. Spire conical, scalar. Apex consists of 4 

 embryonic whorls, which are bluntly conical, depressed, rounded, 

 ribbed, with a distinct suture, and rise to a minute tip (crushed). 

 Whorls 8 in all, broad and short, of regular increase, sharply 

 keeled at the shoulder-spiral, and from this very slightly contracted, 

 but altogether angular, not curved : the last whorl is small, but 

 attenuated, not constricted, is scarcely convex on the base, and is 

 produced into a short, vagtiely defined, and very obliquely pointed 

 snout. Suture very slight, but defined by the angulation at which 

 the whorls meet. Mouth small, narrow, slightly pear-shaped, very 

 little oblique, bluntly triangular above, and prolonged into the 

 short, open, scarcely narrowed canal below. Outer lip flat at the 

 shoulder, angulated at the keel, scarcely convex below this ; the 

 edge projects as a thin sharp lamina beyond the last longitudinal 

 rib, which serves as a varix from the point of the shell to the keel ; 

 the edge is hardly convex, and scarcely forms a shoulder above, the 

 sinus being merely a small rounded hollow. Inner lip : the glaze 

 is exceptionally narrow and short ; the curve of the lip is a very 

 little concave at the base of the pillar, which is rather longer and 

 narrower than one would expect, and which is cut off in front with 

 a long, slightly oblique, bluntly rounded, twisted edge. H. 0"32. 

 B. 0-13. Penultimate whorl, height G"08. Mouth, height 016, 

 breadth 0-06. 



