HELIX. 121 



Section I, TACHEA Leach, 1820. 



Imperforate, globose-conic or depressed, smooth and shining, 

 highly colored, banded with a contrasting shade, last whorl ventri- 

 cose, slightly deflected at aperture; peristome expanded, labiate, 

 columellar lip callous, gibbous. Conspicuous garden-snails of Europe, 

 introduced by commerce into America, Australia, etc. type, H. 

 nemoralis L. 



Section II, EREMINA, Pfeiffer, 1855. 



Depressed globose, flattened above, convex below, rudely striate, 

 cretaceous, solid, white, or marked with dull reddish. Deserts of 

 Egypt and Syria. Type, H. desertorum Forsk. 



Section III, MACULARIA Albers, 1850. 



Imperforate, globose or depressed, whorls 4 or 5, the last usually 

 strongly deflexed at aperture; peristome expanded, callous within, 

 the columellar margin dilated and appressed, callous and sometimes 

 dentate within. Large species, characteristic of southern Europe, 

 especially Spain, and northern Africa. Type, H. vermiculata Mull. 



Section IV, ALLOGNATHUS Pilsbry, 1888. 



Imperforate, globose thin, whorls rapidly increasing, the last 

 large, convex below; aperture rotund-lunate, rounded below; peri. 

 stome slightly expanded; jaw arcuate, smooth, without median pro- 

 jection, stride or ribs. Type H. grateloupi Graells. Ins. Majorca. 



Section V, HEMICYCLA Swainson, 1840. 



Shell covered perforate, globosely depressed, rugosely sculptured, 

 malleated; aperture very oblique, lunate-oval, peristome reflected, 

 thickened within, upper and lower margins sub-parallel, the latter 

 often toothed. Type, H. plicaria Lam. Shells resembling both 

 Macularia and Leptaxis; distribution, Canary and Cape Verd Is. 



Section VI, PLEBICULA Lowe, 1852. 



Umbilicate or imperforate, subglobose, striate, hispid, granulate, 

 aperture rounded, peristome simple, margins approaching, subreflex- 

 ed on columellar margins. Type, H. punctulata Sowb. 



Madeira Is. 



Section VII, LEPTAXIS Lowe, 1852. 



Thin, umbilicate or imperforate, globose or depressed, striate or 

 wrinkled, periphery sometimes keeled, base inflated; columella 



