17 

 *i4. Dcntalitmi Cheverti Sharp & Pilsbr\-. 



1877. Dcntalium septeuicostatuni Braz., Proc. Linn. Soc. N. S. Wales, II, p. 57. 



(Not D. septevicostatiun Abich 1859). 

 1897. Dcntalium Cheverti Pilsbry & Sharp, Manual of Conch., vol. XV'II. p. 9. 



Diagnosis. Shell white, slightly arched, 7-ribbed, ribs somewhat sharp, having finer 

 ones between, e.Ktending from the base to the center, interstices with fine transverse silk-like 

 striae; apex perforated, perforation with a minute notch-like fissure on the dorsal maro-in • 

 aperture circular, entire. Length 14, diam. apex 0,5; base 1,5 mill. (P. & Si-i. from Br.\z.). 



Distribution. Evans' Bay, Cape York, North Australia. 6 fms sand (Chevert Exp.). 



Group of D. OCT.\NGULATUM. 



Octagonal or eight-ribbed at and near the apex. 



I. The whole shell decidedly octagonal. 



a. S — 9 strong ribs at the apex, becoming lower and more obtuse toward 



aperture. Length 50 mill. 10 times the diam octaiigzi latum. 



a. 8 strong prominent narrow ribs. Length 50 — 80 mill, i 2 times the diam. javatium. 

 a". 8 marginating narrow ribs. Length 45 mill. 15 times the diam. . . tubiforme. 

 IL Shell eight-ribbed only at the top; interstices subdivided by secondary and 

 tertiary riblets. 



Greatest diam. about Vu the length oryx^ leiicoryx. 



Greatest diam. about Vs the length cancellatuiii. 



*I5. Dentallttm octangitlafuin Donovan. PI. I, fig. 8. PI. IV, figs 8, 9. 



1803. Dentaliiim octangulatitin Donovan, Nat. hist. Brit. Shells V, pi. 162 (quoted octaiigiilum 

 by TURTON. 



1 8 18. Dentaliuin octogonum Lamarck, An. s. Vert. V, p. 344. 



1 8 19. Dentaliuin striatulnui (in part) Turton, Conch. Diet. Brit. Is. p. 352, pi. 16, fig. 5, 6. 

 ? Dentaliuin aprinuni Mawe, Linn. Syst. Conch, pi. 33, fig. i (not of LiNXE). 



1825. Dentaliuin octogonum Lamarck. Deshayes, Mem. Soc. Hist. Nat. Paris, II, p. 352, 



pi. 16, figs 5, 6. 

 1841. Dentaliuin octogonum Lamarck, Delessert Rec. de Coq., pi. i, fig. r. 



? Dentaliuin octogonum Lamarck. Chenu, Illustr. Conchyl. I, p. 5, pi. i, fig. 21 — 23. 

 i860. Dcntalium octogonum Lamarck. SOWERBV, Thes. Conch. Ill, p. 102, pi. 223, fig. 9. 

 1872. Dentaliuin octogonum Lamarck, Conch. Syst. II, pi. 36, fig. 8. 



1874. Dentaliuin octogonum Lamarck. Liscitke, Jap. Meeres Conch. II, p. 103, III, p. 75, 

 pi. 5, figs 1—3. 

 ? Dcntalium octogonum Lamarck. DUNKER, Index Moll. Mar. Jap., p. 153. 



1877. Dentaliuin octogonum Lamarck. BRAZIER, Proc. Linn. Soc. N. S. Wales II, p. 55. 



1878. Dcntalium octagonum Angas, Proc. Z. S. p. 868. 



1897. Dentaliuin octaiigulatuin Donovan. PiLSBRY & SHARP, Man. of Conch., vol. XVII, p. 16, 



pi. 2, figs 16, 17, 18, 22. 

 Not D, octagonum Costa, Fauna Reg. Nap. Dent. p. 19, pi. i, fig. 6 (1850). 



SIBOGA-EXPEDrriE LIV. 5 



