52 



Key to Species. 



I. Shell with numerous unequal annular swellings eburneum. 



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

 III. Shell moderately curved. 



a. Ape.x entire, simple. Length 30 mill., 12 times the diam lactezim. 



b. Ape.x; 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 i i times the diam bisimiatum. 



*62. Dentalium longitrorsum Reeve. PI. II, fig. 33, 33a. 



1842. Dentaliiwi longitrorsum Reeve, P. Z. S. 1S42, p. 197. 



? Dentalium longitrorsum Reeve, Conch. Syst. II, p. 6, pi. 130, fig. 6. 



i860. Dentalium longitrorsum Reeve. SOWERBV, Thes. Conch. Ill, p. 98, pi. 225, figs 59, 60. 



1872. Dentalium longitrorsum Reeve, Conch. Icon. XVIII, pi. 2, figs <^a, b. 



1877. Dentalium longitrorsum Reeve. BRAZIER, Proc. Linn. Soc. N. S. Wa'es, II, p. 59. 



1879. Dentalium longitrorsum 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. PiLSBRV & Sharp, Man. of Conch., vol. XVII, p. in, 

 pi. 20, figs 35, 36. 



? Dentalium lamarckii Chenu, Illustr. Conch. I, Dent., p. 5, pi. 6, figs 15, 15(2. 



? 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 Pilsbry). 



Distribution. 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 (]VL\c-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. Dentalkiiii eburtieuni Linne. PI. II, fig. 31. PI. I\', figs 10, II. 



1767. Dentalium eburneum Linne, Syst. Nat. (12), p. 1264. 

 1 8 18. Dentalium eburneum Linne. L.'VM.'VRCK, An. s. Vert. V, p. 346. 

 i860. Dentalium eburneum Linne. SoWERBY, Thes. Conch. Ill, p. 98, pi. 225, fig. 53. 

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



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

 pi. 20, figs 33, 34. 



