59 



shell may have been a fossil one". It has now also been reported by Melvill & Standen as 

 generally distributed in the Indian Ocean at 7 — 60 fms. 



72. Dentalium stenoschizum P. & Sh. PI. W, figs 16, 17. 



1897. Dentalium stenoschizum Pilsbry & Sharp, Man. of Conch. vol. XVII, p. 128, pi. 19, 



figs 10 — 15. 

 1860. Dentalium translucidum Desh. SüWERBV, Thes. Conch. III, p. 98, pi. 225, fig. 47. 

 1872. Dentalium translucidum Desh., Conch. Icon. XVIII, pi. 6, fig. 39. 

 Net D. translucidum Desh. 1825. 



Stat. IJ. Sailus ketjil, Paternoster-islands. 27 Metres and less. Coral and coralsand. 4 Spec. 



Stat. 104. Sulu-harbour. Sulu-island. 14 Metres. Sand. 2 Spec. 



Stat. 184. Anchorage oft" Kampong Kelang, South coast of Manipa-island. 36 Metres. Coral, 



sand. 2 Spec. 

 Stat. 258. Tual-anchorage, Kei-islands. 22 Metres. Lithothamnion, sand and coral. i Spec. 



Diagnosis. Shell rather strongly arcuate toward the smaller end, rapidly tapering, the 

 earlier portion slender and delicate, the length about 10 times the diameter of aperture. Milk- 

 white, somewhat translucent. Very glossy and polished throughout, and entirely without sculpture 

 except for slight, inconspicuous annular irregularities of growth. Aperture slightly oblique, nearly 

 circular, being a trifle compressed laterally; peristome thin. Anal orifice circular, with thin edges. 

 Slit extremely narrow, linear, and long, its length contained about 3V.. times in length of .shell, 

 situated on the convex side. 



Length 35, antero-posterior diam. aperture 3,4, lat. diam. 3,2; diam. of apex 0,6 mill. 

 Length 34,5, antero-posterior diam. aperture 3,5, lat. diam. 3,4; diam. of apex 0,5 mill. 



Distribution. West-Indies. 



Remarks. This species was only known from the West-Indies, and is now proved to 

 occur also in the East Indian Archipelago. I have compared the Siboga specimens with some of 

 the Mus. d'hist. nat. de Paris. They were sent to me under the name of D. trattshicidtim Desh. 

 and proved to be no other than the D. Inuishicidiim Desh. of Sowerby in the Thes. Conch. 

 and Conch. Icon. and which has been renamed D. slenoschiztu7i by Messrs Pilsbry & Sharp. 

 The true D. Iranshicidum is a form without a slit of unknown habitat. 



/o- 



Dentalium tcnuifissitui Monterosato. PI. VI, figs 18, 19. 



1897. Dentalium tenuifissum Monterosato. PiLSBRV & SlIARl', Man. of Conch., vol. XVII, 



p. 129, pi. 19, figs 16, 17. 

 1884. Pseudantalis tcnuifissa Monterosato, Nom. Gen. e spec. Conch. Medit. p. 33. 



Stat. 51. Madura-bay and other localities in the southern part of Molo-strait. From 69 — 91 



Metres. Fine grey sand; coarse sand with shells and stones. 8 Spec. 

 Stat. 153. 0°5'.8N., 130° 24'. 3 E. North oft" Waigeu-island. 141 Metres. Fine and coarse sand 



with dead shells. i Spec. 

 Stat. 204. 4°2o'S., 122° 58' E. Between islands Wovvoni and Buton. From 75 — 94 Metres. 



Sand with dead shells. i Spec. 

 Stat. 240. Banda-anchorage. 9 — 45 Metres. Black sand. Coral. 14 Spec. 

 Stat. 248. Anchorage oft' Rumah Lusi, North-point of Tiur-island. Till 54 Metres. i Fragment. 



