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part of the edge of the aperture. These shells are either 

 turreted or fusiform, varying in length; terminated at the 

 base by a straight canal more or less lengthened; right 

 margin with a deep narrow notch or slit near its upper 

 part; the spiral whorls variously sculptured, as in the 

 preceding genus; aperture closed by a small horny 

 operculum. 



Pleurotoma imperialis 



auriculifera 



muricata 



echinata 



flavidula 



interrupta 



crenularis 



cincta 



* • unizonalis 



lineata 



spirata 



Pleurotoma nodifera. 

 [There are also thirty fossil species.] 



Pleurotoma fascial is 



bimarginata 



buccinoides 



cingulifera 



virgo 



Babylonia 



undosa 



marmorata 



tigrina 



crispa 



albina 



