372 Mr. E. A. Smith on 



Tliis fine species is as large as the Japanese D. Vernedei 

 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 inter- 

 vening riblets appear, so that the interstices, which above are 

 broader than the lirse, become narrower. The lines of growth 

 ai-e 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 millim. 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 broken off. 

 These injuries are probably done by fishes or crustaceans. 

 The shells are whitish, but coated with a dark brown earthy 

 deposit. The Rev. Professor H. M. Gwatkin informs me 

 that the radula is quite normal and that the figure given by 

 Sars of Ayitalis 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." 



Cardium [Fragum) simillimum. 



Testa alba, mediocriter globosa, antics rotuudata, postice truncata, 

 quadrata, striis confertis teuuibus radiautibus sculpta, incre- 

 mentique liueis plus minus decussata, latus posticum versus 

 minute grauulata ; umbones prominentes, incurvati ; pagina 

 interna alba, nitida, marginibus anteriore, postico et ventrali 

 minute denticulatis circumdata ; cardo tenuis, dente laterali 

 antico valvse sinistrae conico, acuto, compresso, postico parvo fere 

 obsoleto. 



Longit. 21 millim., alt. 21, diam. 17. 



Hah. Ofi' Colombo Lighthouse, in 142-400 fathoms. 



A single left valve is all that was obtained of this interesting 

 species. The fine radiating strise are absent in the lunular 

 region, which consequently is smooth. The granules, 

 arranged in radiating series, appear to be restricted to the 

 hinder part of the shell, judging from the specimen at hand. 

 The sculpture is similar to that of C. peramabili's, from 

 50-125 fathoms in the West-Indian region, as described 

 by Mr. Dall *. The posterior portion of the surface is 



* Bull. Mus. Comp. Zool. Harvard, vol. ix. p. 132, vol. xii. p. 269, 

 pi. iv. tig. 7, pi. xl. fig. 4. 



