Bay of Bengal and the Arabian Sea. 239 



fractu3 10, supremus 3ubglobo3U3, loevis, c?e^eri iu medio angulati, 

 supra concavi, itifra coniracti, oblique pliciti, plicis supra angu- 

 lum baud productis, iafra medium liris tenuibus transversis fili- 

 formibus oruati, supra lineis incrementi tenuissimis curvatis 

 sculpti, ultimus antice rostratus, oblique tenuiter liratus ; apertura 

 cum canali longit. totius | sequans ; labrum tenue, iu medio 

 arcuatim prominens, prope suturam baud profunde sinuatuii ; 

 columella laevis, subrecta ; canalis parura obliquus, angustatus. 

 Longit. 26 millim., diam. 8; apertura cum caaali 13 louga, 3 lata. 



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



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

 and very short, commencing at the median angle and scarcely 

 reaching the suture below. 



4. Pleurotoina (Surcula) eurina. 



Testa breviter fusiformis, alba, epidermido tenui sordide lutescente 

 induta ; aufractus normales 9-10, supra medium concavi, iafra 

 convexi, et nodose costati, uudique spiraliter tenuiter striati, 

 lineisque incrementi tlexuosis sculpti, in anfr. ultimo costis leviter 

 obliquis circiter 16 infra subito attenuatis et fere evanidis ; 

 apertura alba, longit. totius ^ adsequans ; columella recti uscula, 

 vix arcuata, alba, laevis ; labrum tenue, superne late et profundu 

 sinuatum ; canalis auterior brevis, latus, obliquus. 



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



Uab. 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 subdistanter plicati, ct spiraliter 

 tenuiter striati, lineisque incrementi flesuosis sculpti, ultimas 

 Levis, convexus, baud plicatus ; apertura longit. totius ^ fere 

 sequans ; 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. 



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

 Kemarkable for the smooth convex bodj-whorl, which con- 

 trasts with the plicate spire. Two dead specimens. 



6. Pleurotoma (Surcula) arcana. 



Testa fusiformis, sordide albida, epidermide tenui olivacea induta ; 

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



17* 



