52 



Key to Species. 



I. Shell with numerous unequal annular swellings ebtwneum. 



II. Shell strongly curved. Length 90 mill., about 19 times the diam. . . . longitrors7ini. 

 III. Shell moderately curved. 



a. Apex entire, simple. Length 30 mill., 12 times the diam lacteitm. 



ó. Apex thickened. Length 40 — 45 mill., 13 — 14 times the diam. . . . banale, 

 c. Apex with a notch on the convex side and a smaller one on the concave 



side. Length 33,5 about 1 1 times the diam bisinuatum. 



*62. Dentalmm longitrorstuii Reeve. PI. II, fig. 33, 331:7. 



1842. Dentalitim longitrorsuin Reeve, P. Z. S. 1842, p. 197. 



? DentaliHui longitrorsuin Reeve, Conch. Syst. II, p. 6, pi. 130, fig. 6. 

 1860. Dentalium longitrorsiim Reeve. SOWERBY, Thes. Conch. III, p. 98, pi. 225, figs 59, 60. 

 1872. Dentalium longitrorsiim Reeve, Conch. Icon. XVIII, pi. 2, figs (^a, b. 

 1877. Dentalium longitrorsum Reeve. Brazier, Proc. Linn. Soc. N. S. Wales, II, p. 59. 

 1879. Dentalium longitrorsuui Reeve. Watson, Journ. Linn. Soc. Lond., XIV, p. 515. 

 1885. Dentalium longitrorsum Reeve. Watson, Challenger Scaph. 

 1893. Dentalium longitrorsum Reeve. COOKE, Ann. Mag. N. H. (5), XVI, p. 271. 

 1897. Dentalium longitrorsum Reeve. PiLSBRY & Sharp, Man. of Conch., vol. XVII, p. iii, 

 pi. 20, figs 35, 36. 



? Dentalium lamarckii Chenu, Illustr. Conch. I, Dent., p. 5, pi. 6, figs 15, 15^. 



? Dentalium longitrorsum Paetel. Catalog I, p. 593. 



Diagnosis. Shell much and evenly curved, very long and slender, the length (of chord) 

 about 19 times the greatest diameter; thin, but solid, polished, amber or carnelian colored or 

 tinted, or pure white. Sculpture none, save inconspicuous growth lines. Aperture circular, the 

 peristome thin. Anal orifice circular, entire or ovate, and with a slight notch slightly aside 

 from the middle on the convex side. 

 Length 89, diam. of aperture 4,7, height of arch from chord 16 mill. (From Pilsbrv). 



D ist ribu tion. Darnley Island, Torres Straits 30 fms, sandy mud (Chevert Exp.); west 

 of Cape York, south-west of Papua, 25 fms (Challenger Exp.); Bombay (Melv. & Abercombre) ; 

 Gulf of Suez (Mac-Andrew); Philippines (Sowerby; Philad. Acad. coll.; Zool. Mus. of Amsterdam); 

 Zanzibar & China (Brit. Mus.). 



Remarks. The biggest specimen at the Zool. Mus. of Amsterdam has a length of 85 

 with a greatest diam. of 5 mill. It is light yellow with some darker bands. 



63. Dentalium eburncuDi Linné. PI. II, fig. 31. PI. IV, figs 10, II. 



1767. Dentalium eburneuin Linné, Syst. Nat. (12), p. 1264. 

 i8i8. Dentalium eburncum Linné. Lamarck, An. s. Vert. V, p. 346. 

 1860. Dentalium eburneum Linné. SoWERBY, Thes. Conch. III, p. 98, pi. 225, fig. 53. 

 1872. Dentalium eburneum Linné, Conch. Icon. XVIII, pi 3, fig. 16. 



1897. Dentalium eburneum Linné. PiLSBRY & Sharp, Man. of Conch., vol. XVII, p. 115. 

 pi. 20, figs 33, 34. 



