DENTALIUM-BATHOXIPHUS. 121 



notch at the apex. It is nearly straight. (Sowb., Thes. Conch., iii, 

 p. 99, pi. 225, f. 40, 1860; Conch. Icon., xviii, pi. 5, f. 32 (not f. 

 31). 



Length 29, greatest diam. 1-6 mill, (from figure). 



It is fulvous, shining, semipellucid, larger and more curved than 

 D. filum. The figures of this species and D. filum were inadvert- 

 ently transposed in the Conchologia Iconica. (G. B. S. in letter). 



D. TORNATUM Watson. PI. 3, figs. 39, 40, 41. 



Shell small, narrow, very finely tapering, slightly, but very 

 equably bent, strong, of a quill-like translucency and brilliance. 

 Sculpture: the upper part of the shell is encircled by deep, close- 

 set, slightly oblique grooves, which look as if they were turned in a 

 lathe. Farther down the shell they become shallower, and cease at 

 last rather abruptly. The flat bands of the shell-surface which part 

 them are of variable widths, and increase with the growth of the 

 shell from about O'Oll inch to twice that amount. The front part 

 of the shell is closely, minutely, obliquely striated in the line of 

 growth, with here and there a very faint depression, just suggestive 

 of the grooves above. There is besides these a faint, transverse 

 flocculence in the substance of the shell. Mouth edge thin, not con- 

 tracted, very slightly oblique. The apex is abruptly broken across, 

 and there the edge of the shell is thick, and from the opening there 

 projects a minute, round pipe about O'OOS broad and 0'012 long, 

 slightly striated obliquely, abruptly broken off at the end. In most 

 of the specimens only the mere stump of this delicate tube remains. 

 Length 0'55, breadth 0'038, apex O'OIS inch (Watson). 



Levuku, Fiji, 12 fms. (Challenger). 



D. tornatum WATS., Journ. Linn. Soc. Lond., xiv (1879) ; Chall. 

 Rep., p. 13, pi. 2, f. 3. 



This species seems to vary a little in breadth ( Watson). 



Subgenus BATHOXIPHUS Pilsbry & Sharp, 1897. 



Shell thin, conspicuously compressed laterally, nearly or quite 

 smooth, with a broad slit on the convex side of apex. 



D. ENSICULUS Jeffreys. PI. 7, figs. 7, 8, 9, 10. 



Shell tapering, considerably and regularly curved throughout or 

 with the latter half nearly straight. Laterally compressed or flat- 

 tened ; thin, nearly transparent, and glossy. Sculpture : a sharp keel 

 on both the dorsal and ventral sides (giving the appearance of a 



