20 



Remarks. In the older specimen the sculpture is not so clearly visible as in the 

 younger one. The chalky and dark brown deposit in the oldest specimen renders the cancellated 

 character less striking, even quite invisible on some parts. Both specimens show an extremely 

 deep circular incision where a breken peristome lias been repaired. 



D. hibiforiiie is much finer cancellated than D. cancellatiun and there are no secondary 

 riblets as in that species. 



*i8. Dcntalium cancellatum Sowerby. PI. I, fig. i6. 



1860. Dentaliuui canccllatuin Sowerby, Thes. Conch. III, p. loi, pi. 224, fig. 36. 



1872. Dentalium cancellatum Sowerby, Conch. Icon. XVIII, pi. 5, fig. 29. 



1897. Dentaliuin cancellatum Sowerby. PlLSBRi' & Sharp, Man. of Conch., vol. XVII, p. 30, 

 pi. 10, fig. 67. 



Diagnosis. Shell thin, white, acuminate, strongly curved towards the apex, where it is 

 cancellated b}^ about 8 longitudinal ribs and elevated concentric striae, then the shell becoming 

 straighter and the ribs more numerous (Sowb.). 

 Length 257^, greatest diam. 3 mill. (P. & S. from hg.). 



D istribu tion. China Sea. 



19. DcnlaliiLiii oryx n. sp. PI. VI, fig. 24. 



« 



Stat. 302. io°27'.9S., I23°28'.7E. 216 Metres. Sand and coral sand. 5 Spec. 



Diagnosis. Shell straight or only with a faint curve at the top. Sculpture of 8 narrow 

 riblets at the apex, increasing to doublé that number by intercalation 

 of secundary riblets and doubling again that number by renewed inter- 

 calation of tertiary riblets. Interstices faintly concave, without longitudinal 

 or transverse sculpture. Ribs persistent toward the anterior aperture, 

 their profile irregularly undulated. 



Anal orifice with a short wide incision. Anterior aperture distinctly 

 octagonal, not obliciue. Colour white or bluish white, a little transparent. 

 mill. 



b. Length 20 mill., greatest diam. 1,8 mill. 



c. Length 27 mill., greatest diam. 2,2 mill. 



Fig. 14. Anterior aperture 

 and apex of D. oj-yx. 



a. Lencfth 26 mill., greatest diam 



20. Dentalium Iciicoryx n. sp. PI. VI, fig. 23. 



Stat. 285. 8°39'.i S., I27°4'.4E. 34 Metres. On the limit between mud and coral. 3 Spec. 



Diagnosis Shell moderately curved, white, shining and transparent 

 in young individual. -Sculpture of eigth narrow rounded riblets at the apex, 

 soon increasing to doublé that number by intercalation. Ribs persistent 

 toward aperture in the youngest individuals, becomino- a little obsolete in 



l-'ig. 1 5. Anterior aperture ... ^ o o 



and apex of D. Uucoi-y.x. the older iudividual. The profile of the ribs is irregularly undulated, due to 



