rURFURA. 127 



Sub-gen. thai.essa, H. aud A. Adams. 



Spire elevated, whorls spinose, angulated at the upper part ; 

 aperture moderate ; columella rounded, tubercular in front; outer 

 lip nodulous internally. 



affinis. Reeve. hippocastanum, Linn. 



alveolata, Reeve. intermedia, Kien. 



armigera, Chem. mancinella, Lain. 



bimaculata, Jonas. melones. Duel. 



bitubercularis, Lam. pica, Blainv. 



deltoidea. Lam. speciosa, Valenc. 



echinata, Blainv. tumulosa, Reeve. 



echinulata. Lam. unifascialis, Lam. 



■ Sub-gen. steamonita, Schumacher. 



Spire elevated, whorls simple or nodulous ; aperture moderate, 

 produced anteriorly ; columella rounded, simple in front. 



segrota, Reeve. Floridiana, Conrad. 



bicostalis, Lam. gigantea. Reeve. 



biserialis, Blainv. hsemastoma, Linn. 



Blaiuvillii, Desh. Janellii, Kien. 



cataracta, Chem. luteostoma, Chem. 



Conradi, Nutt. Tipoti, Petit. 



consul, Chem. rustica. Reeve. 

 fasciata, Reeve. 



Sub-gen. trochia, Swainson. 



Whorls separated by a deep groove ; inner lip thickened, con- 

 vex, striated ; apei'ture with a very short canal. 



cingulata, Linn. spiralis, Reeve. 



