67 



Diagnosis. Shell long, narrow, tapering, gently contracted at the mouth, slightly bent 

 throughout; rather strong, polished, but hardly brilliant, translucent white. Sculpture: very faintly 

 transversely striated on the surface, and a very minute flocculence in the same direction in the 

 texture. For the breadth of the shell the mouth is large, perfectly round, oblique, with a 

 smoothly rounded edge, which is sharp on its inner margin. The apex is small, much chipped, 

 but that in such a way as in all the specimens to produce a shallow rounded hollow on either 

 side, with a sharp, projecting point before and behind. Within the opening a short excessively 

 minute riblet runs out along the middle of the posterior wall; it shines through the shell like 

 a depression, being a little more transparent than the shell-wall. 

 Length 0,328 in., breadth at mouth 0,028; greatest 0,39; at apex 0,013 inch. (Watson). 



Distribution. Raine Island, Cape York, N. E. Australia, 155 fms. (Challenger). 



Remarks. This species differs from the previous {dichehis) in being much narrower 

 and having no swelling. 



'"11. Caduhis iiiinuius H. Adams. PL III, fig. 49. 



1872. Cadulus miniitus H. Adams, Proc. Zool. Soc. 1873, p. 10, pi. 3, fig. 9. 

 1872. Dcntalimn ininntuni Sowerby, Conch. Icon. XVIII, pi. 7, fig. 48. 

 1885. Dentalium minntum Sowerby, A. H. CoOKE. Ann. Mag. N. H. (5), XVI, p. 273. 

 1897. Cadulus iiumitus H. Adams. PiLSBRY & SHARP, Man. of Conch, vol. XVII, p. 188, 

 pi. 26, fig. "j^. 



Diagnosis. Shell smooth, thin arcuate, a little contracted anteriorly, whitish. Aperture 

 circular, slightly oblique. Length 4, diam. % mill. (H. Ad.). 



Distribution. Red sea. 



Remarks. Judging after the figure which Sowerby has given, this shell very probably 

 belongs to the section Dischides. 



&" 



Section Polyschides Pilsbry & Sharp 1897. 

 1897. Polyschides Pilsbry & Sharp, Manual of Conch., vol. XVII, p. 146. 



Shell inflated above the middle or not much bulging; apex cut into a number of lobes, 

 generally four, by as many slits. Type C. (Polyschides) Iclraschistits Wats. 



12. Cadulus hcxaschislus n. sp. PI. VI, fig. 53. 



Stat. 178. 2°4o'S., I28°37'.5E. Ceram Sea. 835 Metres. Blue mud. i Spec. 



Diagnosis. A large white shell, moderately curved, not very strongly swollen, the 

 gibbosity regularly narrowing toward both ends, except on the convex side near the anterior 

 aperture, where the shell is slightly flattened and narrows more rapidly toward the mouth. 

 Gibbosity hardly visible on the concave curve, stronger on the convex curve, but always rounded, 



