110 DENTALIUM-LiEVIDENTALIUM. 



D. LEPTOSCELEs Watson. PI. 3, figs. 44, 45, 46. 



Shell very attenuated, thin, brilliant, porcellanous, with longitu- 

 dinal flecks of opaque white on the translucency of the shell, chiefly 

 toward the apex, where the shell thickens, very little bent, very 

 slightly compressed between the convex and concave curves. Sculp- 

 ture: there is some kind of flexuous longitudinal texture in the 

 structure of the shell affecting the reflection from the brilliant sur- 

 face, which is also closely and regularly scratched transversely by 

 very minute, sharp, but superficial lines, which run round the shell 

 a little elliptically. Length 1-5, breadth 012, at apex 0-04 inch 

 [37-5, 3 mill.]. ( Watson). 



Animal yellow, with a large dark patch in the region of the liver. 

 A close little bunch of captacula round the mantle opening. ( Wat- 

 son). 



S. of Australia, kit 42° J^2' S., long. 134° 10' E., in 2600 fms. 

 (Challenger). 



D. leptosceles Watson, Journ. Linn. Soc. Lond., xiv, p, 513 

 (1879). — D.leploskeles Watson, Challenger Rep., p. 7, pi. 1, f. 6. 



This species in form very much resembles D. erectum G. B. Sow., 

 British Museum " from Sydney," for while some specimens of that 

 species are more curved than this, others are even less so ; but in 

 this species the transverse striae are very much more oblique, and in 

 the former there is no trace of the irregular intratextural longitudi- 

 nal striae which exist here. Than D. agile Sars, this is a straighter 

 and much more cylindrical, attenuated, brilliant, and delicate shell. 

 (Wats.). 



D. LUBRiCATUM Sowerby. PI. 19, fig. 22. 



Shell polished, elongate, white, subpellucid, lightly curved, 

 slightly slit, gradually increasing. (Sowb.). Length 64, greatest 

 diam. 6 mill, (from fig.). 



Off Port Jackson Heads 45 fms. (Challenger) ; Australia (Sow- 

 erby). 



D. lubricatum Sows., Thes. Conch., iii, p. [95], pi. 225, f. 56 

 (1860) ; and in Conch. Icon., xviii, pi. 7, f. 55 (1872). — Brazier, 

 Proc. Linn. Soc. N. S. Wales, ii, p. 370 (1878). 



Certainly a narrower shell, less solid and of more gradual increase 

 than either D. entalis or D. pretiosum (Soivb.). Brazier seems to 

 have obtained a specimen dredged by the " Challenger " oflf Port 

 Jackson. 



