U<n/ <>f liiiujiil (Hid (In: Anihiuil Sea. 2 IM 



Dentalrum profundoruiit, Smith. 



Denfaliutn profundorinn, Smith, Anu. & Mag. Nat. Hist, 1894, vol. xiv. 

 p. 1(57, pi. iv. fig. 18; Pilsbrv, Man. Conch, vol. xvii. p. 7!), pi. vi. 

 Iig.82. 



Hah. Station 28.3, ofTK. of Ceylon, 108G fath.; Station 331, 

 off Andiiniaii Islands, 509 fath. 



The single very slender specimen from Station 331, 

 although 80 ram. in length, is only 6 mm. at the broadest 

 diameter. This results from its perfect growth from the 

 very young state, the young shell not being broken as is 

 generally the case in these large Dentalia. It tapers to a 

 point less than a millimetre broad, aiul exhibits in the usual 

 position a very fine slit 4 mm. in length. The examples 

 from Station 283 arc quite like the original ty[)e from off 

 Colombo. 



Dentalium serrulatum, sp. n. 



Testa solidinscula, levitor arcuata, lente attenuata, longitudinaliter 

 tenuiter lirata, liris s8Di)e plus minus minute serratis, transversim 

 tenuiter striata, striisquo longitudinalibus iiidistincte decussata, 

 alba, [jostice breviter fissnrata ; apcrtura circularis. 



Longit. 56 mm., diam. max. G. 



Hab. Andaman Islands, (iO fath. 



The distinguishing feature of this species is the peculiar 

 fine serration of t!;e fine riblets, especially those upon the 

 concave curve of the shell. Probably this character would 

 be lost in worn specimens. Judging from the gradual 

 tapering of the shell, 1 do not think it would attain much 

 larger dimensions than those here given. The fine decus- 

 sation of the surface is only observable in well-preserved 

 examples. The riblets number sixty to sixty-six at the larger 

 end and about thirty at the narrow extremity. Only one of 

 the two speidmcns exhibits a slight terminal notch, but 

 probably the young shell would have a narrow slit. The 

 curve of shell is different in the two examples at hand, one 

 being straighter ihan the other. 



Dentalium cornu-bovis, sp. n. 



Testa magna, valde curvata, celeriter accrescens, alba, nitida, 

 solidiuscula, tenuissirae longitudinaliter striata, striis antice fere 

 o^soletis, lineis incrementi oblique llexuosis sculpta, postice 

 breviter vel vix ti.ssa ; apertura circularis, ad margiuem tenuis, 

 iiitus alba. 



Longit. 59 mm., diam. max. 12. 



