46 

 D istr ibu t i o n. North of Papua 1070 fms; mid-Pacitic E. of Japan, 2050 fms. (Challenger). 



Remarks. This shell is rather like D. 7tsitatuin, but is more slender and more attenuated. 

 Tlie number of the riblets near the apex varies between 40 and 45. It is rather curious that 

 it occurred at exactly the same stations as tisitatum. 



Here follow the measurements : 



a. Length 51,5 mill., diam. of aperture 2,8 mill. 



b. Length 50 mill., diam. of aperture 2,5 mill. 



c. Length 50 mill., diam. of aperture 3,2 mill. 



d. Length 45 mill., diam. of aperture 3 mill. 



54. Dentalium aciculum Gould. PI. II, fig. 36. PI. V, figs 13, 14. 



1859. DentaÜHvi aciaduin Gould, Proc. Bost. Soc. N. H. VII, p. 165. 



? Dentalium aciculum Gould, Otia Conch., p. 119. 



1872. Dentalium acicitlnm Gould. SOWERBY, Conch. Icon. XVIII, pi. 7, fig. 52. 



1897. Dentalium aciculum Gould. PiLSBRY & Sharp, Man. of Conch., vol. XVII, p. 7, fig. 52. 



Stat. 52. 9°3'.4S., 119° 56'. 7 E. Sumba Sea. 959 Metres. Globigerina ooze. i Spec. 

 Stat. 133. Anchorage off Lirung, Salibabu-island. Up to 36 Metres. 4 Spec. 



Diagnosis. .Shell slender, considerably tapering, attenuated posteriorly, moderately 

 curved throughout but more toward the apex ; glossy white, nearly opaque. Sculpture of fine, 

 close, deepty engraved longitudinal striae near the apex (extending over only a seventh the 

 total length in the type specimen), the remainder of the shell smooth and polished, with faint 

 growth striae only. Aperture circular, a trifle oblique. Anal orifice with a slight notch on the 

 convex side and a concave wave on the opposite part. Length 24, diam. at aperture 2,55, at 

 apex 0,6 mill. (P. & Sii.). 



D ist rib u t i on. Coast of China 23^50' N. lat., in 25 fms. 



Remarks. The two Siboga-specimens obtained at different stations, are both longer 



than the type. The measurements are : 



a. Length 41 mill, diam. of apert. 2,8 mill. 



b. Length 41 mill., diam. of apert. 3 mill. 



There are moreover two specimens in the Museum of Amsterdam, also bigger than the 

 tyjje and measuring : 



a. Length 40,5 mill., diam. of apert. 3,2 mill. 



b. Length 35 mill., diam. of apert. 2,6 mill. 



All have a slieht notch on the outer and a concave wave on the inner curve. The 

 specimen of Stat. 133 has also a slight indication of a supplemental tube. 



Subgenus Kpisiphon Pilsbry & Sharp 1897. 

 Episiphon Pilsbry & Sharp, Manual of Conchology, vol. XVII, p. 117. 

 Small, very slender, rather straight shells, needle-shaped or truncated, slightly tapering, 



