Bay of Bengal and the Arabian Sea. 167 



(P. Z. S.1883,p. 108) . They agree with the Atlantic examples 

 in general form and solidity, but are considerably larger, and 

 the spiral striation is of a different character, being excessively 

 fine in comparison. The figure given by Cantraine of T. cari- 

 natus (Mai. Mediterr. pi. vi. fig. 23), which is considered 

 synonymous with C. peloritanus, if enlarged, would give a 

 fair idea of the bicarinate example of the present species, 

 excepting the aperture being too small. The opercula of both 

 are identical. 



17. Scaphander andamamcus. (PL IV. fig. 15.) 



Testa ovata, tenuis, alba, hie illic ferrugineo tincta, transversirn 

 punctato-striata, superne et circa basin striis paucis baud punc- 

 tatis cincta ; spira immersa, concava ; apcrtura magna, infra lata, 

 superne angustata ; labrum leviter arcuatum, tenuissimum, superne 

 ad insertionem incrassatum callosum album ; columella valde 

 arcuata, intus convoluta, usque ad apicem perspicua, alba, iucras- 

 sata. 



Longit. 18 millim.. diam. maj. 12, min. 9 ; apcrtura 18 longa, 

 inferne 9 lata. 



Hah. Andaman Sea, in 250 fathoms. 



The punctured grooves, about 40 in number, are not always 

 equidistant, and the punctures are also variable in size. 



18. Lepidopleurus similis. (PI. IV. figs. 9-12.) 



Testa elongata, paulo angusta, in medio dorsi acute arcuata, sordicle 

 albida, intus alba, undique regulariter et eleganter granulata ; 

 area) laterales modo leviter definitse, lineas incrementi paucas ex- 

 hibentes ; valvae medians (fig. 11) postice rectae, breves ; lamina? 

 suturales parvse sinu lato sejunctae ; lamina? insertantes nulla? ; 

 valva anterior (fig. 10) semicircularis, lamellis et fissuris haud 

 instructa ; valva posterior (fig. 12) mucrone centrali aliquanto 

 acuto instructa ; cingulum angustum, griseum, arenaceum, spiculis 

 albis brevissimis, pra?sertim supra marginem externum, amictum. 



Longit. 16 millim., diam. 7. 



Hob. Off Colombo, lat. 6° 32' N., long. 79° 37' E., in 

 675 fathoms. 



Allied to L. alveolus, Sars, but more strongly granulated, 

 with the lateral areas of the central valves faintly defined by 

 a slight depression. 



19. Dentalium profundorum. (PI. IV. fig. 18.) 



Testa magna, solida, leviter arcuata, longitudinaliter tenuissime 

 striata, lineisque incrementi obliquis sculpta, sordidc lutcscens, 



