8 



1872. Dentaliuin clephantinuiit Linné. Reeve, Conch. Icon. XVIII, pi. i, fig. 5. 



? Detitaliiini elepliantiniini Linné. Chenu, Illustr. Conchyl. pi. i, fig. 4 — 10. 



? Dentaliuin elepliantinmn Linné. Hanlev, The shells of Linnaeus, p. 435. 



.' Dentaliuin elephantinuin Linné. SüWERBY, The Genera of Shells, Zool. Journ. IV, p. 196, 

 Dentalium fig. i. 

 1897. Dentalium elephantinuin Linné. PiLSBRY & Sharp, Man. of Conch. vol. XVII, p. r, 



pi. I, figs 1—7. 

 Not Dentaliuin elephantiiiuin Brocchi, Conch. Foss. Subapp. II, p. 260 (18 14). 

 Not Dentaliuin elepliantinuin Philippi, Enum. Moll. Sicil., I, p. 245. 

 Not Dentaliuin elephantiiiuin Deshayes, Mon. genre Dent. (1825). 



Not Dentaliuin elephaiitinum Risso, Hist. Nat. Prodr. Eur. merid. IV, p. 399, 1826. 

 Dentaliuin arcuatum Gmel., Syst. Nat. (13), p. 3738 (1788). 

 Dentaliuin arcuatum Gmel., Anton, Verzeichniss d. Conchylien, p. 25 (1839). 

 \ Dentalium clephautiuin Born, Mus. Caes. Vindob, p. 431. 

 Dentaliuin recurvum Deshayes (by error ?) Mon. Dent. p. 30. 

 Dentalium stnatuiii (in part) Born, 1. c. p. 431. 



Diagnosis. .Shell robust, the greatest diameter somewhat less than one-si.\th the length, 

 solid, strongly curved ; dark green, fading to white at the anal opening. 

 Sculpture, about 10 (9 — 11) strong, projecting rounded longitudinal ribs, 

 narrower than their intervals, which are concave, with one or several weak, 

 low riblets; growth striae delicate, inconspicuous. Aperture sub-circular, scarcely 

 oblique, modified by the ribs, especially on the concave side ; anal orifice 

 p. circular, its edge excavated within and slightlv notched excentricallv on the 



Anterior aperture of convex side. Length 70, diaiTi. at aperture 11,5 X 11 mill., height of arch 



D. elephaittinuin. -i, /t-, o ^ \ 



above chord 15,5 miU. (r. & bH.). 

 D istr i but i o n. Amboyna (Rumphius); Philippine Isl. ; Molluccas; Red Sea (Issel). 



Remarks. This well known species of probably no unfrequent occurrence on the shores 

 of the East Indian Archipelago was not obtained by the Siboga Expedition. It is represented 

 in the collection of the Zoological Museum of Amsterdam by twelve fine specimens of which 

 eight have 10, two have 9 and two have i i ribs of these five have the apex excentricallv 

 notched either to the right or to the left. Of the remaining seven, four have perfectly round 

 apertures (of which two are relatively )oung individuals) while three have a slight supplemental 

 tube. In one specimen it forms a slight rim along the notched aperture as in I). ciitalis, in 

 the other two the projecting pipe, though short is round and the notch is only formed by the 

 outer layer of the shell. 



Length of the longest individual 90, diameter at aperture 10 mill. All from the Molluccas. 



*2. Dentalittin foriuositiii Adams & Reeve. PI. I, iig. 2. 



1848. Dentalium formosiim Adams & Reeve, Zool H. M. S. .Samarang. Moll. p. 71, pi. 5, fig. \a, b. 

 1860. Dentalium formosum Adams & Reeve. SoWERBV, Thes. Conch. III, p. 102, pi. 223, fig. 2. 

 1872. Dentalium formosum Adams & Reeve, Conch. Icon. XVIII, pi. 2, fig. 7. 

 1897. Dentalium formosum Adams & Reeve. PiLSBRY & Sharp. Man. of Conch. vol. XVII, 

 p. 2, pi. I, figs 9 — I I. 



Diagnosis. Shell robust, solid, cylindric, moderately curved. Sculplure of 13 — 16 



