25G 



grooved, and slightly crenated or dentated at or near 

 the right margin, which is sharp. It has a semilunar, 

 thin, horny operculum. From the animal of one species 

 of this shell the ancients extracted the Tyrian purple 

 dye. 



Purpura Persica 



Purpura sacellum 



Rudolphi 



squamosa 



patula 



rugosa 



columellaris 



textilosa 



succincta 



sertum 



consul 



Francolinus 



armigera 



limbosa 



bitubercularis 



ligata 



hippocastanum 



cruentata 



undata 



lapillus 



haemastoma 



imbricata 



mancinella 



lagenaria 



bufo 



cataracta 



callosa 



bicostalis 



neritoides 



plicata 



planospira 



fiscella 



callifera 



thiarella 



coronata 



rustica 



carinifera 



semi-imbricata 



scalariformis 



echinulata 



