214 



tion to the before-mentioned lobe which forms a curious anterior 

 sinus. Canal short, rather wide. Length 31 ; width ii millini 



Hab. : — Cape iNatal bearing N. by E. ; distant 24 miles ; 

 depth, 440 fathoms. Bottom, mud. Also (dead shells) Buffalo 

 River, bearing North ; distant, 15 miles; depth, 310 fathoms. 



This remarkable shell is characterised by the double keel 

 of the anterior angle becoming merged towards the finish 

 of the last whorl, so as to form an almost tube-like process pro- 

 jecting from the aperture. This is present in all the adult speci- 

 mens I have seen, but it varies in length and position, in some 

 cases lying further back, and terminating before quite reaching 

 the edge of the aperture. The shell bears some resemblance 

 to Plciirotovia congener, Smith (Annals and Magazine of Natural 

 History, 1894, Vol. IV., page 160, plate III., figs. 4 and 5), some 

 specimens of which show indications of the above-mentioned 

 character, but irregularly and in a less marked degree, so that it 

 is not mentioned in Smith's description. The two species are 

 however no doubt specifically distinct. 



Pleurotoma (Drillia) FOSSATA (Plate III., fig. 5). Shell 

 fusiform, acuminated at both ends, pale fulvous, obscurely spot- 

 ted with brown, here and there tinged with light purple, and 

 coloured anteriorly with a purplish band. Spire acute, gradate ly 

 turreted ; whorls 8, the first two smooth, rounded, forming a 

 papillary apex, the third angular and ribbed below the angle, 

 the rest deeply concave at the top, the concavity being bordered 

 by a sharp erect keel, below which the whorls are slightly con- 

 vex, with short very oblique plicae, and about 5 spiral liras which 

 are sharply angular at the top and slopingly compressed on the 

 under side. Last whorl about equal in length to the spire, 

 slightly convex above, and tapering to the base ; the oblique 

 plicae against the keel become almost obsolete on the latter half 

 of the whorl, while the spiral lirag numbering about 22 

 are quite as deep and broad as those on the upper whorls. Aper- 

 ture oblong, moderately wide, without any definite anterior 

 canal ; outer lip thin, with rather a broad sinus at the juncture of 

 the whorl. 



Length 22 ; width 7 millim. 



Hab. : — Cape Vidal (Natal) bearing N.N.E., \ N. ; distant gi 

 iniles ; depth, 80 to 100 fathoms. Bottom, rock. 



A shell of a very distinct character, quite unlike any other 

 known species. The sharp erect keel at the top of the whorls, 

 the broad channel between this and the suture, and the numer- 

 ous curiously sloping spira liras throughout, are its chief char- 

 acteristics. 



Pleurotoma (Drillia) scitecostata (Plate IV., fig. 10). 

 Shell fusiform, acuminated at both ends, light brown colour with- 



