47 



thin and fragile, glossy and smooth, or at least without longitudinal sculpture; apex with a 

 projecting pipe or a simple orifice ; no slit, rarely a notch. 



Inhabitants of moderately or very deep water in the Mediterranean, xAdantic, Gulf of 

 Mexico and Pacific. 



The small accessory tube or pipe at the apex is frequently developed in most, perhaps 

 all, of the species grouped here; although most young and many adult shells lack it. (P. & Sh.). 



The subgenus Episiphon consisted hitherto of 7 species of which D. sudrechcin Jeffreys 

 only habitated the Indo pacific province. Most of the species are rather hard to distino-uish, 

 the differences being principally based on highly variable characters, as size, rate of increase, 

 curvature and colour. Young specimens are often very different from adults of the same species, 

 as is proved by D. carnetim of which one specimen measuring 18,5 mill, has a greatest diam. 

 of 1,4 mill, while a much younger individual measuring 15,5 mill., has a greatest diam. of 

 0,8 mill. It is therefore often practically impossible to draw conclusions about the species, if 

 the material is not larsje enousfh. 



& 



Key to Species. 



a. Shell whitish or delicately salmon-tinted subrechtm. 



6. Shell deeply flesh-coloured carneuni. 



55. Dentaliuni s^ibrectuui -t,-infi4. PI. VI, figs 46 — 50. 



1882. Dentaliuni subrectuni Jeffreys, Proc. Zool. Soc. p. 661 (see under D. filiini). 

 1897. Dentaliuni subrectuni Jeffreys. PiLSBRY & SHARP, Man. of Conch., vol. XVII, p. 119, 

 pi. 18, fig. 5. 

 Dentaliuni subrectuni Sowerby in part, (those reported from the Philippines) Conch. 

 Icon., pi. 5, fig. 31 (not fig. 32!) i860. 



Stat. 4. Anchorage oft" Djankar (Java) 7°42'.6 S., II4°I2'.6E. 9 Metres. Coarse sand, i Spec. 



Diagnosis. Shell acicular or needle-shaped, thin, extremely slender, tapering almost 

 to a point, nearly straight, translucent whitish, with the faintest reddish tint from the middle 

 to the apex. Surface very glossy, smooth, with faint growth striae only. Aperture not oblique, 

 circular. Anal orifice minute, circular, with thin, entire edge. Length 16, diam. of aperture i mill. 



Distribution. Philippines (Cuming); Batavia (Prof. Sluiter). 



Remarks. A young specimen was obtained by the Siboga. It is much acuminated and 

 with a length of 16 mill, has a greatest diam. of i mill. There are moreover several specimens 

 brought b)' Prof. Sluiter from Batavia. I have identified them with subrectuni^ and hold them 

 for older than Jeffreys' types. Here follows a more exact description of Sluiter's specimens : 

 Shell narrow, slender, cylindrical, moderately curved, acuminated in young, truncated in adults; 

 quite smooth, with hardly perceptible growth striae; colour whitish, very delicately salmon-tinted, 

 especially near the shell's middle, with some opaque white bands. Apex attenuated and simple 

 or truncated with very thick walls and a small supplemental tube. Anterior aperture rounded, 

 sometimes a little oblique. 



