238 Mr. E. A. Smith on Mollasca 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 minoj'um infra suturam in- 

 structi, transversim plus minus obsolete striati, ultimus infra 

 seriem tuberculorum distinctius transversim- striatus, lineisque 

 increraenti flexuosis tenuibus sculptus ; apertura alba, longit. 

 totius g paulo minor; iabrum tenue, ad angulura subprot'unde 

 sinuatum ; columella rectiuscula ; canalis obliquus, leviter 

 reeurvus. 



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



Hab. Station 232, off Soutli 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 [Bathytoma) Oldhami. 



Testa breviter fusiformis, alba ; spira acute pyramidalis ; anfractus 

 circiter 10, sutura profunde canaliculata sejuncti, leviter concavi, 

 infra suturam zona sublsBvi sed margine inferiorecrenulato cincti, 

 supra suturam cingulo, tuberculis numerosis gracilibus ornato, 

 instructi, circa medium lira tenui crenulata cincti, ultimus liris 

 transversis confertis tenuibus granosis ornatiis, superno convexi- 

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

 sequans ; Iabrum tenue, in medio prominens, curvatum, paululura 

 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. 



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



A very beautiful and interesting species closely allied to 

 P. atractoidesj 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 liraj 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) breviplicata. 



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



