HELIX. 167 



Group VII, HELICELLA, Ferussac. 1819. 



Shell generally umbilicated, the peristome simple or slightly 

 expanded, usually thickened on its inner margin, rarely dentate 

 Distribution nearly universal, but mostly European. 



Section I FRUTICICOLA, Held. 1837. 



Umbilicate or perforate, depressed-globose, often pilose; whorls 

 5-7, a little convex; aperture widely lunar or lunately rounded, 

 peristome acute, shortly expanded, a little thickened within, basal 

 margin reflected. 



Mostly European. 



The synonymy includes Hygromia, Risso, Bradybcena, Beck, 

 Hygromanes (Fer.) Gray. 



Subsection I, PETASIA, Moquin Tandon. 1855. 



Narrowly perforate, turbinately globose ; whorls 6-8, narrow, the 

 last not descending; aperture obliquely lunate, peristome patulous 

 or subreflected, labiate and bidentate within. H. BIDENS, Chemn. 



Europe. 

 Dibothrion, Pfeiffer is a synonym. 



Subsection II, TROCHISCUS, Held. 1837. 



Basal lip lamellarly thickened within. H. edentula, Drap. 



Europe. 

 Subsection III, TRICHIA, Hartmann. 1840. 



Depressed, narrow whorled, usually pilose, columellar margin 

 callous. H. HISPIDA, Linn. 



Europe. 

 Bradybcena, Stabile, is a synonym. 



Subsection IV. ZENOBIA, Gray, 1821. 



Conoidal, perforate, smooth, translucent, peristome simple. 

 H. GLABELLA, Drap. 



Europe. 

 Subsection V. MONACHA, Hartmann. 1840. 



Conical, perforate, smooth, translucent, peristome labiate and 

 subreflected. H. INCARNATA, Mull. 



Europe. 



Subsection VI, CARTHUSIANA, Kobelt. 1871. 



Perforate, subglobose-depressed, inflated, corneous white, trans- 

 lucent, peristome distinctly labiate. H. CARTUSIANA, Mull. 



Europe. 



