2[6 



cave, with a rounded slightly tubercular ridge just below the 

 suture ; the lower rather convex, furnished with a row of oblong 

 nodules, or short stout costae (9 on the penultimate whorl) ; very 

 finely spirally striated throughout. Last whorl about equal in 

 length to the spire, obtusely angled ; left side obliquely sloping, 

 right rather convex ; no rostrum ; the nodules at the angles are 

 produced downwards so as to form slightly oblique stout rounded 

 ribs. Aperture rather short ; columella nearly straight, covered 

 by a thin callus which is somewhat thickened above ; outer lip 

 slightly arcuate, anterior canal very short, posterior sinus deep 

 and moderately wide, situated at the angle of the whorl. 



Length 22 ; width at angle 9 millim. 



Hab. : — Lion's Head bearing N. 67° E. ; distant 25 miles; 

 depth, 1 36 fathoms. 



This shell presents the slight obliquity of form prevailing in 

 the sub-genus or section Clavus. It is singularly destitute of 

 colour markings, and does not bear a striking resemblance to 

 any known species, but perhaps its nearest ally is P. Ediihce, 

 Sowerby. 



Pleurotoma (Genotia) bel^formis (Plate IV., fig 8). 

 Shell broadly fusiform, acuminately conical at both ends, whitish. 

 Whorls 6|-, slightly convex, obtusely angled above, with a punc- 

 tured groove a li'ttle below the suture ; obliquely irregularly 

 wrinkled, spirally striated. Last whorl aoout three-fifths of the 

 entire length of the shell, rather inflated above, tapering below, 

 without rostnim ; spiral striae numerous and close, oblique 

 wrinkles almost obsolete. Aperture rather wide in the middle, 

 interior white, columella slightly twisted, outer lip sharp, with a 

 broad posterior sinus. 



Length 22 ; width 9 millim. 



Hab.: — Vasco de Gama Pk. bearing N. 71° E. ; distant i Si- 

 miles ; depth, 230 fathoms. 



A shell of simple character, having somewhat the aspect of a 

 northern form of Bda. 



Mangilia (EUCYTHARA) Africana (Plate v., fig. 9). Shell 

 fusiform, acuminated at both ends, obtusely angled in the middle, 

 somewhat obscurely banded with light and dark brown, with nar- 

 row whitish interstices, dark purplish brown between the angle 

 and the suture. Spire rather long, acute ; whorls 7, angularly con- 

 vex, finely spirally striated throughout, longitudinally regularly 

 ribbed, ribs narrow, rather distant (12 on the penultimate whorl). 

 Last whorl longer than the spire, angular above, then slightly 

 convex, attenuated towards the base, terminating in a short nar- 

 row slightly recurved rostrum. Aperture long, rather wide in the 

 middle, and narrower at each end ; interior closely plicated, dark 



