new Species o/Pleurotomidae. 313 



narrower at the base than above, thus producing the turreted 

 aspect. Tlie plicate ribs are very prominent and the penulti- 

 mate on the bodj-whorl is considerably remote from that 

 which forms the labrum. As they are rather produced at 

 the upper end the whorls have a somewhat castellated appear- 

 ance, and in all the four examples which I have examined 

 they are continuous up the spire. 



Pleurotoma [Mangilia) fortistriata. 



Testa ovata, albida ; anfractus 7, primi 2 laeves, politi, cseteri cou- 

 vexi, costis crassis 7 (super spiram plerumque continuis) in anfr. 

 ultimo basi continuis instructi, et striis spiralibus fortibus ubique 

 insculpti ; apertura parva, longit. totius -f^^- adaequans ; labrum 

 validissime incrassatum, iiitus dentibus 4-5 parvis munitum, et 

 paululum infra suturam loviter sinuatum ; canalia angustus, 

 brovis. 



Long. 6| mill,, diam. 2k. 



Hah. Bombay. 



This is a strong solid species with seven stout rounded ribs 

 continuous up the spire and extending to the base of the body- 

 whorl. 



Pleurotoma {Mangilia) mamillata. 



Testa subovata, lutescens ; anfractus 5, primi duo magni, laeves, con- 

 vexi, papillosi, caeteri convexi, costis 7-8 supra spiram subcon- 

 tinuis (in anfr. ultimo ad basim productis) instructi, ubique tenu- 

 issime spiraliter striati, et liris spiralibus 2-3 parum prominenti- 

 bus sed supra costas leviter iucrassatis prope medium cincti ; 

 anfract. ultimus liris circiter 8 ornatus ; apertura longitudinis 

 totius quam ^ paulo minor ; labrum valde incrassatum, levissime 

 sinuatum ; columella callo tenuissimo induta ; can alls brevis, 

 angustus. 



Long. 5^ mill., diam. 2. 



Hab. — ? 



This shell is very remarkable on account of the large size 

 of its nuclear whorls. When more specimens are examined 

 this may prove to be but an individual peculiarity. 



Pleurotoma [Mangilia) suhquadrata. 



Testa ovata, turrita, cornea, superne ad suturas inter costas rufo 

 tincta et circa anfract. ultimum paulo infra medium rufo zonata; 

 anfract. 7, apicales pallidi, caeteri superne decliviter tabulati et 

 angulati, infra angvdum planiusculi, costis tenuibus 12-14 et 

 liris spiralibus gracilibus 2-3 (in anfr. ultimo circiter 10) cancel- 



