ZONITES. 1 1 5 



Smyrnensis, Hath. verticillus, Ferus. 



Tugurum, Bens. 



Sub-gen. trochomorpha, Albers. 



Sliell umbilicate or sub-imperforate, trocbiform ; apex more 

 or less obtuse; whorls flattened, tbe last keeled ; peristome acute, 

 tbe coluniellar margin, rarely, tbickened or tootbed. 



approximata, Le Gillou. Kiisteri, Pfeiff. 



Bermudensis, Pfeiff. nigritella, Pfeiff. 



Bobolensis, Pfeiff. ocbroleuca, Ferus. 



conus, Phil. Pacifica, Pfeiff. 



Eurydice, Gould. rectangula, Pfeiff. 



Gouldi, Pfeiff- solarium, Quo;/. 



Guerini, Pfeiff. spirulata, Pfeiff. 



iusculpta, Pfeiff. trocbiformis, Ferus. 



Sub-gen rotola, Albers. 



Sbell perforate or imperforate, lenticular or trocbiform, 

 acutely keeled ; wborls regularly increasing, tbe last abruptly 

 convex, impressed next tbe columella ; peristome thin, mar- 

 ginate, acute. 



Bensoni, F. d . Busch. detecta, Ferus. 



Sub-gen. vidkxa, H. and A. Adams (Discus, Albers, not 



Fitz.). 



Shell widely umbilicated, discoidal, keeled, flat, or slightly 

 elevated above, convex at the base, last whorl slightly deflcxed 

 at the aperture; peristome simple, acute, or slightly marginate, 

 the margins arcuated. 



D J 



acutimargo, Pfeiff. Beckiana, Pfeiff. 



albocincta, Pfeiff. exclusa, Ferus. 



