38 



Diagnosis. Shell large, thick, moderately curved, perceptibly tapering posteriorly, 

 obliquely truncated anteriorly; sculptured everywhere with many delicate ribs crenulated by 

 transverse striae; slit narrow, of varying length. Length 115, greatest diam. 15 mill. 



Dis tributi o n. Lat. S°4o'N., 8i°27'.35E. in 637 — -800 fms.; off Trincomalee, east 

 coast of Ceylon. 



Remarks. This fine species is as large as the Japanese D. vertiedci^) or the fossil 

 D. grande Desh. The form, however, is more rapidly tapering than that of either, and the 

 sculpture is not precisely similar; the aperture is larger than in either of the species quoted 

 and almost circular. The longitudinal ridges are fine and numerous, numbering about twenty-five 

 to thirty at an inch from the apex. Towards the anterior end intervening riblets appear, .so 

 that the interstices, which above are broader than the lirae, become narrower. The lines of 

 growth are distinct, and on crossing the riblets towards the posterior end produce a granulated 

 appearance; the ridges are much smoother anteriorly and less elevated. The length of the 

 fissure is variable, but this is probably chiefly due to damage. In the most perfect specimen it 

 is 13 millimetres in length and rather more than half a millimetre in width. All three specimens 

 exhibit reparation of injuries at the anterior end, and in two the posterior extremity has been 

 breken off; these injuries are probably done by fishes or crustaceans. The shells are whitish, 

 but coated with a dark brown earth deposit. The Rev. Professor H. M. Gwatkin informs me 

 that the radula is quite normal, and that the figure given by Sars of Antalis striolata closely 

 represents it, except that in the present species the central tooth is a little wider and the inner 

 edge of the lateral makes a smoother muzzle. (E. A. Smith). 



44. DentaliiDii Htmgerfordi Pilsbry & Sharp. PI. Il, fig. 30. 



1888. Dentalluui compressiiin Sovvb., P. Z. S. p. 569, pi. 28, fig. 18. 



1897. Dentalium Hiingerfordi Pilsbry & Sharp, Man. of Conch., vol. XVII, p. 84, pi. 6, fig. 83. 



Not D. coiiipressuin Watson 1879. 



Stat. 105. 6°8'N., 121° 19' E. 275 Metres. Coralbottom. i Spec. juv. 



Diagnosis. Shell rather wide, almost straight, acute; unequally com- 

 pressed ; toward the apex slightly inclined. Tawny, irregularly banded with 

 brown. Sculptured with very numerous plano-convex unequal riblets, and cancel- 

 lated by but slightly conspicuous transverse striae. Slit long and narrow. 

 Aperture somewhat oval. 



Fig. 21. Ant. apert. 



oi D. Hungcrfordi. Lcugth 72, greatest diam. 12 mill. 



D ist r i bu t i o n. Hongkong. 



Remarks. A very distinct and remarkable species, more highly coloured than its 

 congeners; but it is chiefly distinguished by its curiously compressed form. A second specimen, 

 brought by Dr. Hungerford, is only 62 millimetres in length, and rather wider in proportion. It 



1) D. Vcrncdei Soweib. measures : Length 90 — 130, diam. of aperture 11 — 15 mill. 



