*2i. Dcntaliitm disexangtilatii/u Sowerby. PI. I, fig. 7. 



i860. Dcntalium blscxangulatiim Sowerby, Thes. Conch. Ill, p. 102, pi. 223, fig. 8. 

 1872. Dentalium bisexangulatuin Sowerby, Conch. Icon. XVIII, pi. 3, fig. 14. 



1877. Dentalium bisexangulatuin Sowerby. Braziek, Proc. Linn. Soc. N. S. Wales 11, p. 57. 

 1879. Dentalium bisexangulatuin Sowerby. VON MARTENS, Monatsber. Preuss. Akad. Wiss. 



Berlin, p. 739. 

 1885. Dentalium bisexangulatuin Sowerby. CuoKE, Ann. Mag. N. H. (5), XVI, p. 273. 

 1897. Dentalium bisexangulatuin Sowerby. PiLSBRV & Sharp, Man. of Conch., vol. XVII, 



p. 15, pi. 2, fig. 25. 



Diagnosis. Sliell well curved, solid, moderately stout, the length about 11 or 12 times 

 the greatest diameter; white. Sculpture of about 12 (11 to 13) strong longitudinal narrow ribs, 

 about a third as wide as the concave intervals, which are ribless or show a weak median thread 

 on the convex side (or occasionally all the intervals except one or several on the concave side 

 have low median threads); growth-striae fine and superficial. Aperture a trifle compressed 

 laterally, strongly angulated by the projecting ribs on the concave margin. Anal orifice rounded, 

 with a wide, shallow notch on the convex side. 



Length 68, length of aperture 6,5, breadth 6 mill; height of arch from chord 10 mill. 

 Length 72, length of aperture 6,2, breadth 6 mill; height of arch from chord i 1,5 mill. (P. & Sh.). 



Distribution. Java (Sowerby); Singapore (Archer); Yokohama, Japan (Loomis) ; Gulf 

 of Suez (Mac-Andrew); Torres Straits and Vicinity, 8 — 30 fms (Chevert Exp.); Ouerimba Isl. 

 and Mozambique (Peters coll.). 



Remarks. No specimens were obtained by the Siboga. Pilsbry .states that there are 

 oftener 1 1 than 1 2 ribs, and that the development of an intermediate thread in each space 

 over the greater part of the shell is occasional though probably exceptional. 



*22. Dentaliiiiii mtercalahini Gould. PI. L fig. 9. 



1859. Dentalium intercalatum Gould, Proc. Bost. Soc. Nat. hist. \'II, p. 166. 



? Dentalium intercalatum Gould, Otio Conch. 

 1872. Dentalium intercalatum Gould. SowERBY, Conch. Icon. XVIII, pi. 7, fig. 45. 

 1897. Dentalium intercalatum Gould. PiLSBRY & Sharp, Man. of Conch., vol. XVII, p. 23, 



pi. II, figs 88, 89. 

 1904. Dentalium intercalatum Gould. Jos. C. Verco. Notes on South-Austr. Moll. Trans. 



Proc. Rep. Roy. Soc. S. A., vol. XXVIII, p. 135 — 138, pi. XXVI (fig. of radula). 

 1897. Dentalium Bednalli Pilsbry & Sharp, Man. of Conch, vol. XVII, p. 248, pi. 39, figs i, 2, 3. 



1878. Dentalium octagonum Angas (non Lam.), P. Z. S. p. 868, Henley Beach S. A. 



? 1893. Dentalium octogonum Adcock's Hand List of the Aquatic Mollusca inhabiting South- 

 Austr. p. 10. 



It is practically impossible to give one clear diagnosis for this exceedingly variable 

 species. Here follows first the diagnosis of D. inlcrcalatuvi Gould, being taken after a young 

 specimen, then of D. bednalli P. & Sh. being a description of an old specimen of mtercalahim 

 under a new name. 



Diagnosis of a young specimen. Shell strongly curved and conspicuously tapering 

 in its earlier half, the later half nearly straight and less tapering; white,- lusterless. At and near 



