2 DENTALIUM. 



its edge excavated within and slightly notched excentrically on the 

 convex side (fig. 6). Length 70, diam. at aperture ll'SXll mill.; 

 height of arch above chord 15*5 mill. 



Amboyna (Rumphius) ; Philippine Islands (Phil. Acad. Coll.). 



D. elepharitinum LINN., Syst. Nat. (10), p. 785 (1758) ; Ibid (12), 

 p. 1263 (1766). GMEL., Ibid (13), p. 3736 (1788). LAM., Syst. 

 An. s. Vert., p. 326 (1801); Anim. s. Vert, v, p. 343 (1818). 

 WOOD, Index Testae., p. 183, No. 2 (1818). Sows., Thes. Conch., 

 iii, p. 102, pi. 223, f. 4 (1860) ; and in Reeve, Conch. Icon., xviii, 

 pi. 1, f. 5. CHENU, Illustr. Conchyl., pi. 1, f. 4-10. HANLEY, The 

 Shells of Linnaeus, p. 435. SOWB., The Genera of Shells, Dentalium, 

 f. 1 ; Zool. Jour., iv, p. 196. Not D. elephantinum Brocchi, Conch. 

 Foss. Subapp., ii, p. 260 (1814), nor of Philippi, Enum. Moll. Sicil., 

 i, p. 245 ; ii, p. 206, nor of Desh., 1825, nor of Risso, 1826, p. 399. 

 See D. delessertianum Chenu. 



D. arcuatum GMEL., Syst. Nat. (13), p. 3738 (1788). ANTON, 

 Verzeich., p. 25. D. elephantium BORN, Mus. Cses. Vindob., p. 431. 

 ? D. reeurvum DH., (by error ?), Monogr. Dent., p. 30. D. striatum 

 (in part) BORN, 1. c., p. 431. 



A well known species, well distinguished by its robust form, green 

 color and (usually) ten strong ribs. The apical orifice often has a 

 slight rim, as in D. entails; and the short notch is situated between 

 two of the ribs a little aside from the median line of the convex 

 side. 



D. FORMOSUM Adams & Reeve. PI. ], figs. 9, 10, 11. 



Shell arcuate, rather tumid, 13-ribbed, the ribs rounded, inter- 

 stices rather wide. Anal end slit, the slit on the convex side, wider 

 toward the apex. Very beautifully variegated with rose, olive-green 

 and white (A. & jR.). Length 60, greatest diam. 13'5 mill, (from 



Sooloo Archipelago, outside a coral reef near the city of Sooloo, 

 in about 16-20 fms., sandy mud (Adams). 



D. formosum A. & R., Zool. H. M. S. Samarang, Moll., p. 71, pi. 

 5, f. 1 a, b (1848). SOWB., Thes. Conch., iii, p. 102, pi. 223, f. 2 

 (I860). SOWB. in Reeve, Conch. Icon., xviii, pi. 2, f. 7 (1872). 



Of rather lighter and more tumid growth than D. elephantinum, 

 richly variegated with rose, olive-green and a little white. Sow- 

 erby figures and describes it as with 15 ribs. 



