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nated at the upper part, with a sinus at the lower part, separate from the canal 

 or notch of the base. 



gtgas, 



accipitrinus, 



latissimus, 



tricornis, 



gallus, 



bitubcrculatus, 



cristatus, 



dilatatus, 



bubonius, 



S. lentiginosus, 



' auris Dianas, 



' pilgilis, 



' pyrulatus, 



' gibbernlus, 



' luhuanus, 



' Mauritianus, 



' canarium, 



S. Isabella, 



' vittatus, 



' epidromis, 



' columba, 



' succinctus, 



' troglodytes, 



' tridentatus, 



' urceus, 



S. plicatus, 

 ' florid us, 

 ' papilio, 

 ' liueatus, 

 ' marginatus, 

 ' turritus, 

 ' cancellatns, 

 1 fossil species. 



PURPURIFERA.— Eleven Genera. 



Shell with a short canal ascending posteriorly, or an oblique notch or dcmi- 

 canal at the base of the aperture, directed towards the back. 



This family is separated into two divisions. 



DIVISION I. The canal ascending, or curved towards the back. 



Cassidaria. Shell subovate or ovate oblong; aperture longitudinal, nar- 

 row, terminated at the base by a curved, subascending canal. Right lip 

 varicose or replicate; left lip laid over the columella, mostly rough, granu- 

 lated, tuberculated or wrinkled. 



C. echinophora, 



' cingulata, 



C. striata, 

 ' thyrrena, 



C. oniscus, 



2 fossil species. 



Cassis. Shell inflated; aperture longitudinal, narrow, terminated at the 

 base by a short canal abruptly curved towards the back of the shell; columella 

 plaited or transversely wrinkled. Right lip mostly toothed. 



C. Madagascarensis, C. areola, C. achatina, C. canaliculata, 



' cornuta, ' zebra, ' pyrum, ' semigranosa, 



' tuberosa, ' decussata, ' Zeylanica, ' vibex, 



' flammea, ' abbreviata, ' sulcosa, ' erinaceus, 



' fasciata, ' rufa, ' granulosa, ' plicarla, 



' glauca, ' pennata, ' saburon, 1 fossil species. 



' crumena, ' testiculus, 



DIVISION II. Jin oblique notch, inclining backwards. 



Ricinula. Shell ovate, the exterior mostly tubercular or spinous; aper- 

 ture oblong, with a demicanal at the lower part, curved towards the back, 



