420 BEV. K. BOOG WATSON ON THE 



twenty-seven on the last whorl ; but they diminish rapidly up the 

 spire. The base of the last whorl is defined by a small rounded 

 thread, which forms a feeble keel ; it lies quite below the origin of 

 the outer lip. A little remotely below it lie two or three others, 

 rather weaker, but prominent, widely parted, rounded threads, 

 with four or five similar ones on the snout, of which the last one 

 or two are stronger than the others. Colour polished porcellaneous 

 white. Spire scalar and stumpily conical, with its profile-lines 

 much interrupted by the constriction of the sutures. Apex con- 

 sists of two embryonic whorls ; it is large and dome-shaped, 

 haviDg the extreme tip quite immersed and the suture almost sup- 

 pressed. Whorls 5 J in all (but the specimen is immature); they 

 are short and broad, of rather rapid increase, with a broad hori- 

 zontal shoulder and a sharp carinated angle, below which they 

 are cylindrical with a slight contraction to the lower suture ; the 

 last is broadest at the keel, a little contracted below this point, 

 tumid on the base, drawn in at the pillar, with a small, short 

 sharp-pointed snout. Suture very strong and distinct, from the 

 concave curve of the whorl above it and the horizontal tabulation 

 of the collar below. Mouth largish, angularly pear-shaped. 

 Outer lip thin, angulated, straight and horizontal above, convex 

 and patulous below the angle, drawn in at the snout; it re- 

 treats at once on leaving the body to form the rather deep, 

 narrow, rounded sinus which occupies the shoulder ; below this 

 it descends very little, but runs out into a very convex curved 

 edge, whose prominence is greatly increased by the rapidity and 

 extent of the retreat of the lip-edge at the snout. Inner lip is 

 narrowly excavated in the substance of the shell on the body 

 and down the pillar ; it has a convex contour across the body, at 

 the junction of which and the pillar is a strong but rounded 

 angle ; the pillar is short, strong, conical, obliquely truncated 

 in front, with a sharp, rounded, twisted edge. H. 025. B. - 16. 

 Penultimate whorl, height - 04. Mouth, height - 14, breadth 

 0-09. 



The largest specimen of this species seems somewhat imma- 

 ture. 



23. Plburotoma (Dbilma) ttla, n. sp. (ovXos, crisp.) 

 St. 169. July 10, 1874. Lat. 37° 34' S., long. 179° 22' E. 

 N.E. from New Zealand. 700 fms. Grey ooze. Bottom tem- 

 perature 40°. 



