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 i"ch. (Watson). 



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



R e m a r k s. This species differs from the prev'ious {dichelus) in being much narrower 

 and having no swelling. 



"^11. Cadtilus Diinutus H. Adams. PI. III, fig. 49. 



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

 1872. Dentalium miruitum Sowerby, Conch. Icon. XVIII, pi. 7, fig. 48. 

 1885. Dcntalimn miniitiim Sowerby, A. H. CoGKE. Ann. Mag. N. H. (5), XVI, p. 273. 

 1897. Cadulus minutus H. Adams. PiLSBRY & Sharp, Man. of Conch. vol. XVII, p. 188, 

 pi. 26, fig. 78. 



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

 circular, slightly oblique. Length 4, diam. ^V* rniH- (H. Ad.). 



Distribution. Red sea. 



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

 belonofs to the section Dischides. 



t>- 



Section Polyschides Pilsbry & Sharp 1S97. 

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



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

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



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



Stat. 178. 2°40'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, w-here 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, 



