Bay of Bengal and the Arabian Sea. 239 



fractus 10, supreinus subglobosu?, loevis, coefceri iu medio angulati, 

 supra concavi, infra contracti, oblique plicati, plicis supra angu- 

 lum baud productis, infra medium liris tonuibus transversis filj- 

 formibus ornati, supra lineis incrementi tenuissimis curvatis 

 sculpti, ultimus antice rostratus, oblique tenuiter liratus ; apertura 

 cum caaali longit. totius | £e(iuan3 ; labrum toaue, iu medio 

 arcuatim prominens, prope suturam baud profunde sinuatu'u ; 

 columella Icevis, subrecta ; canalis parum obliquus, angustatus. 

 Lougit. 26 millim., diam. 8 ; apertura cum caaali 13 loaga, 3 lata. 



Hab. Station 233, off Andaman Islands, in 185 fath. 



The plicEe are delicate, oblique, about thirteen in number, 

 and very short, commencing at tiie median angle and scarcely 

 reaching the suture below. 



4. PJeurotoma (Surcula) eurina. 



Testa brevit.er fusiformis, alba, epidermide tenui sordide lutcssente 

 iuduta ; anfractus iiormales 9-10, supra medium concavi, infra 

 couvexi, et uodose costati, uudique spiraliter tenuiter striati, 

 lineisque incrementi liexuosis sculpti, in anfr. ultimo costis leviter 

 obliquis circiter 16 infra subito attenuatis et fere evanidis ; 

 apertura alba, longit. totius |- adgequans ; columella rectiuscula, 

 vix arcuata, alba, Isevis ; labrum tenue, superne late et profunde 

 sinuatum ; canalis anterior brevis, latus, obliquus. 



Longit. 44 millim., latit. 15 ; apertura 18 longa, 6 lata. 



Ilab. Station 232, off South India, in 430 fath. 

 The whorls are bordered below the suture with a thickened 

 margin. 



5. Pleurotoma {Surcula) prcecipua. 



Testa fusiformis, albida, spira acuminata; anfractus 9, superne 

 oblique declives, infra oblique subdist.auter plicati, ct spiraliter 

 tenuiter striati, lineisque incrementi Resuosis sculpti, ultimus 

 Ifevis, convexus, baud plicatus ; apertura longit. totius | fere 

 fequans ; labrum tenue, prominens, curvatum, ad suturam medio- 

 criter profunde sinuatum; columella obliqua, recta, callo tenui 

 reflexo induta. 



Longit. 38 millim., diam, 15 ; apertura 18 longa, 6 lata. 



llab. Station 229, off Travancore coast, in 360 fath. 

 Eemarkable for the smooth convex body-whorl, which con- 

 trasts with the plicate spire. Two dead specimens. 



6. Pleurotoma (Surcula) arcana. 



Testa fusiformis, sordide albida, epidermide tenui olivacea induta ; 

 SDira acuminata, turrita ; anfractus circiter 10, supra declives, 

 1 17* 



