T1IEBA. 



215 



lanuginosa, Euissy. 

 limbata, Drap. 

 multistriata, Desk. 



obstructa, Ferns. 

 occidentals, Reclitz. 

 < livieri, Ferns. 

 Orsinii, Porro. 

 pallidula, Pfeiff. 

 Parlatoris, Die., jmi. 

 pellita, Fern*. 

 planorboides, Rafin. 

 plebcja, Drap. 

 Portoricensis, Pfeiff. 

 pyrrhozona, Pfeiff. 

 Ravergiensis, Ferns. 



revelata, Ffrrus. 

 Rothi, Pfeiff. 



nifescens, Pen it. 

 sericea, Drap. 

 sordida, Pfeiff. 

 stephanophora, Desk. 

 stigmatica, Pfeiff. 

 strigella, Drap. 

 Syriaca, Ehrenb. 

 Tourannensis, Soul. 

 umbrosa, Partsch. 

 vidua, Rossm. 

 villosa, Drap. 

 Winteriana, Pfeiff. 



Genus THEBA, Risso. 



Shell turbinate or globosely depressed, rarely, orbiculately 

 conical, calcareous, umbilicate or rimately perforate ; apex 

 sliiDing, horny, whorls gradually increasing ; aperture 

 lunately rotund or sub-circular ; peristome acute, internally 

 labiate. 



Syn. Teba, Leach. Xerophila, Held. Oxychilus, 

 Fitz. Euparypha, Hartm. Helicopsis, Fitz. Cernuella, 



Sell lilt. 



Ex. T. virgata, Da Costa, pi. 78, fig. 7. Shell, T. 

 Pisaua, Mailer, fig. 7, a. 



The species of this group inhabit Europe and Africa ; one, 

 however, is from Texas, and another from California. 



Species of Theba. 



areolata, Sow. 

 armillata, Lone. 



Boissieri, Charp. 

 candicans, Ziegl. 



