Day 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), wliich is considered 

 synonymous with C. pehintanus, 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 andamanicus. (PI. IV. fig. 15.) 



Testa ovata, tenuis, alba, hie ilLic ferrugineo tincta, transversim 

 puuctato-striata, supernc et circa basin striis paucis haud punc- 

 tatis cincta ; spira immersa, concava ; apertura 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, incras- 

 sata. 



Longit. 18 miUim,, diam. maj. 12, min. 9 ; apertura 18 longa, 

 iuferne 9 lata. 



Ilah. 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. LepidopJeurus similis. (PI. IV. figs. 9-12.) 



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

 albida, intus alba, undique regulariter et eleganter granidata ; 

 arese laterales modo leviter definitas, fineas increment! paucas ex- 

 hibentes ; valvae medianre (fig. 11) postice rect», breves ; laminae 

 suturales parvse sinu lato sejunctaB ; laminae insertantes nullag ; 

 valva anterior (fig. 10) semicircularis, lameUis et fissuris baud 

 instructa ; valva posterior (fig. 12) mucrone central! aliquanto 

 acuto instructa ; cingulum angustum, griseum, arenaceum, spiculis 

 albis brevissimis, praesertim supra marginem externum, amictum. 



Longit. 16 miUim., diam. 7. 



Hah. 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 tcmiissime 

 striata, liucisquc incrcmcnti obliquis sculpta, sordide lutcscens, 



