Fig. 17. Anterior 

 aperture of "■D, 



D. araformi! Cooke. PI. V, figs 31 — 34. 



Shell solid, pale amber coloured, acuminate, arcuate, not very strongly but distinctly 

 fluted with 11 or 12 ribs, the interstices and some of the ribs themselves 

 longitudinally strongly lineated, impressed interstitial lines about 4; apex entire. 

 Length 1,5, width at base 0,15 inch. (Cooke). 



Gulf of Suez. I o — 30 fms (Mac-Andrew). 



Very distinct from D. lineolaticm Cooke, which it nevertheless strongly 

 resembles in its sculpture. This shell is more curved, the ribs are never less <"-atorum cooUe". 

 than eleven and are comparatively obscure, while in lineolatuni there are always nine and they 

 are very marked and prominent. 



Mac Andrew perceived that Belcheri Sow. was wrong and has corrected to '^ Reevii 

 Desh. MSS." I have no idea what this refers to, so will describe the species, which is a 

 good one (Cooke). 



D. claims Cooke. PL V, figs 28 — 30. 



Shell solid, whitish, ungraceful, slightly arcuate, almost equally wide from 

 apex to base ; fluted with about 1 1 very indistinct ribs, interstices longitudinally 

 lineated, the lines sometimes nearly equal to the ribs; apex entire. Length 1,75, 

 diam. 0,2 inch. (Cooke). 



Gulf of Suez (I\La.c-Andrew). 



A remarkably ungraceful shell, reminding one of thick specimens of 

 novemcosfafniii Lam. The breadth is almost the same throughout, ribs verv 



* ' ■' Jig. iS. 



indistinct and impossible to count at the base, interstitial lines proportionately Tiie apical part of 



,/~. , ^D. clavus Coolie''. 



strong (Cooke). 



D. reevei "Desh." Fischer. 



This species, which will shortly be described b\- M. Deshayes, is white, arcuate, having 

 9 longitudinal ribs. The interstices are very finely striated transversely, and some longitudinal 

 narrow ribs run along them. (From P. & Sii.). 



Suez. 



D. laugieri Jousseaume. 



Shell white, solid, cylindrical, slightly arcuate, longitudinally costate; ribs 9, equal, strong, 

 rounded, smooth; the intervals flat, wider, with 3 to 5 delicate striae. Length 40 — 48, diam. 

 7 mill. (From P. & Sh.). 



Aden; Suez. 



*2 4. Dentaluim dcceincostatiiin Brazier. 



1877. Deiitaliitin deceincostatuiii Brazier, Proc. Linn. Soc. N. S. Wales, II, p. 55. 



1897. Dcntalium deccincostatum Brazier. PiLSBRV & SHARP, Man. of Conch., vol. XVII, p. 8. 



Diagnosis. Shell tapering, thin white, slightly arched, longitudinally lo-ribbed, ribs 



