238 Mr. E. A. Smith on Moll asca from the 



1, Pleurotoma optata. 



Testa fusiformis, albida, epidermide tenui grisea induta ; spira 

 turrita, acuminata ; anfractus circiter 10, in medio concavi, infra 

 tuberculati, et serie tuberculorum minorum infra suturam in- 

 structi, transversim plus minus obsolete striati, ultimus infra 

 seriem tuberculorum distinctius transversim striatus, lineisque 

 incrementi flexuosis tenuibus sculptus ; apertura alba, longit. 

 totius g paulo minor; labrum tenue, ad angulura subprofunde 

 sinuatum ; columella rectiuscula ; canalis obliquus, leviter 

 recurvus. 



Longit. 36 millim., diam. 10 ; apertura 15 longa, 4| lata. 



Hah. Station 232, off South India, 430 fath. ; and St. 229, 

 off Travancore, in 360 fath. 



Remarkable for the concave whorls and the row of tubercles 

 just above the suture. 



2. Pleurotoma [Batkytoma) Oldhami. 



Testa breviter fusiformis, alba ; spira acute pyramidalis ; anfractus 

 circiter 10, sutura profunde canaliculata sejancti, leviter concavi. 

 infra suturam zona subla3vi sed margine inferiorecrenulato cincti, 

 supra suturam cingulo, tuberculis numerosis gracilibus ornato, 

 instructi, circa medium lira tenui crenulata cincti, ultimus liris 

 transversis confertis tenuibus granosis ornatus, superne convesi- 

 usculus, antice contractus ; apertura elongata, longit. totius | 

 aequans ; labrum tenue, in medio prominens, curvatum, paululum 

 infra suturam mediocriter profunde sinuatum ; columella leviter 

 obliqua, inferne reflexa, incrassata, in medio plus minus 

 prominens. 



Longit. 43 millim., diam. 15 ; apertura 21 longa, 5 lata. 



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



A very beautiful and interesting species closely allied to 

 P. atractoides, Watson. Only a good figure could convey 

 an idea of the detailed sculpture. A conspicuous feature 

 is the broad smoothish band with the deeply channelled 

 suture above and a narrow deep furrow beneath it ; also the 

 more prominent tuberculated zone on the lower part of 

 the whorls is very striking. The small tubercles on the 

 transverse lirge of the body- whorl are incurved longitudinal 

 rows, following the lines of growth. 



Named after Commander C. F. Oldham, R.N., of the 

 * Investigator.' 



3. Pleurotoma (Surcula) hrevipUcata, 

 Testa albida, gracilis, fusiformis ; spira turrita, acuminata ; an- 



