2 24 



rather deeply channelled ; last whorl broad, convex above 

 with small erect slightly angular nodules in three rows, the two 

 rounded at the periphery, depressly convex at the base ; umbili- 

 cus rather large, round and deep, bordered on the outer edge by 

 an obtuse angle, a second angle appearing a little way within 

 the orifice ; the space between the two angles is slightly flat- 

 tened, numerous very distinct close-set plicae traverse this space, 

 crossing the angles. Aperture rather large, peristome thin, 

 columella margin straight, forming an angle where it joins the 

 basal lip ; outer lip sloping above, rounded at the base. 



Length gi ; width 15^ millim. 



Hab. : — Cape Infanta bearing N., ^ W. ; distant 82 miles ; 

 depth, 40 fathoms. Also Cape St. Blaize bearing N. ; dis- 

 tant 7^ miles ; depth, 37 fathoms. Bottom, fine sand. 



In general aspect, colour, and markings this shell closely re- 

 sembles M. Icpvissiina, Von Martens, from which it may be 

 readily distinguished by the curiously distinct and crowded 

 plicae entering the umbilicus, which is smaller, and defined by a 

 much more distinct angle. 



The operculum is thin, concave, and multispiral, with a raised 

 lamina at the suture of the whorls. 



Dentalium inflexum (Plate v., fig. 11). Shell rather nar- 

 row, much curved, considerably attenuated towards the apex, 

 shining, fulvous, with irregular narrow bands of a darker colour, 

 and sHghtly impressed growth lines ; longitudinally very finely 

 and closely striated, the striae becoming gradually obsolete on the 

 lower half of the shell. 



Length 50 ; width at the aperture 4, and at the apex i millim. 



Hab. : — Tugela River Mouth (Natal) bearing N.W. by W. ; 

 distant 3^ miles; depth, 14 fathoms. Bottom, rock. 



This shell differs from D. longitrorsum, Reeve, chiefly in be- 

 ing finely striated, and in having colour rings at irregular inter- 

 vals, giving it an articulated appearance. 



Dentalium Africanum (Plate V., fig. 10). Shell rather 

 ■stout, very little curved, white, with growth lines rather close, 

 impressed, irregular, otherwise smooth ; apical notch on the con- 

 vex side, V shaped at the top, and descending in a rather narrow 

 slit. 



Length 46; width at aperture 5, at the apex i^ millim. 



Hab.:— Red-topped Hill, A\ of Untwalumi River (Natal) 

 bearing' N. by W. ; distant 2 miles ; depth, 25 fathoms. Bottom, 

 broken shells. 



The shell looks very hke a large D. enialis, and forms a link 

 between H. and A. Adams' sub-genus Antalis and Fischer's s.g. 

 Fissidentalium. After a considerable study of the Scaphopoda, 



