6 HELIX. 



Section II. PLAGIOPTYCHA Pfeiffer. 



Shell umbilicate or imperforate, depressed or subglobose, thin, 

 generally subtranslucerit ; last whorl deflexed at the aperture ; 

 peristome slightly expanded, the baso-columellar margin usually 

 reflexed, free or adnate. Type, H. indistincta Fer. 



Hayti, Virgin Is. and Bahamas. 



Section III. HEMITROCHUS Swainson. 



Shells imperforate or narrowly umbilicate, globose-conic or de- 

 pressed, generally opaque, rather solid, variegated by numerous 

 color-bands ; last whorl rounded at the periphery, deflexed at the 

 aperture ; aperture oblique ; peristome generally somewhat ex- 

 panded ; columellar lip reflexed over or nearly over the perfora- 

 tion. Type, H. varians Mke. 



Bahamas, Hayti, Cuba, Fla. Keys. 



Section IV. DIALEUCA Albers. 



Shell imperforate in the adult, narrowly perforate in the young, 

 conical, elevated or depressed, rather thin ; generally banded; last 

 whorl not descending at the aperture, or only very slightly; peri- 

 stome thin, expanded ; columella oblique, dilated, entering in the 

 center of the axis. Type, H. nemoraloides Ad. 



Jamaica. 



Section V. CORYDA Albers. 



Imperforate in the adult, the young narrowly perforated ; globose- 

 conoidal, strong, solid, conspicuously banded or streaked ; last whorl 

 abruptly deflexed at the aperture ; peristome slightly expanded, 

 labiate within ; colunella oblique, dilated, flattened, entering in the 

 center of the axis. Type, H. alauda Fer. 



Cuba. 



Section VI. JEANNERETIA Pfeiffer, 1877. 



Shell narrowly umbilicate, globose-conoidal, rather thin, corneous 

 or yellowish, banded with brown ; whorls closely spirally grooved, 

 the last deflexed at the aperture, constricted behind the peristome ; 

 aperture oblique, rounded-lunar ; peristome expanded, subreflexed, 

 white, columellar margin sometimes with a tubercular or square 

 tooth. Type, H. multistriata Desh. 



Cuba. 



