32 HELIClDiE. 



an gulate, slightly descending in front; columella inclining, wide; 

 aperture truncately ovate ; peristome thickened, sometimes cal- 

 lously tuberculated, shortly reflected, patulous, basal margin 

 callously dilated. ^. iinperator, Montf. (xcvi, 84), 5 sp. Cuba, 

 Porto Rico. 



Dentellaria, Schum.^ 1817. (Lucidula,Cyclodoma, Swn., 1840.) 

 Shell imperforate, very rarely umbilicated, solid, depressed or 

 conical globose ; spire obtuse ; last whorl deflected in front, 

 mostly angular at the periphery ; aperture oblique or subhori- 

 zontal, transverse ; peristome thick, dentate or tuberculate within, 

 its extremities joined by a heavy parietal callus. H. Josephinae, 

 Fer. (xcv, 72}. 18 sp. West Indies, South America. 



Pleurodojita, Fischer, ISOI. (Caprinus,Montf., 1810. Lyros- 

 toma, Morch, 1852. Lucernella, Swn., 1840.) Shell orbicular, 

 conoidal or lenticular, imperforate, or umbilicus covered ; whorls 

 five or six, flattened, the last carinated or angulated ; aperture 

 elliptical, oblique, nearlj^ horizontal; peristome thick, subtrape- 

 zoidal, the extremities joined by a thickened callus, lower lip 

 dilated, reflected, dentate within, with opposite exterior pits. H. 

 lucei'na, Miiller. H. soror, Fer. (xcvi, 85). 35 sp. Jamaica. 



Labyrmthus, Beck, 1831. (Lyrostoma, Swn., 1840.) Shell 

 umbilicated, depressed orbicular, convex above and below ; 

 whorls five or six, the last carinated, depressed at the aperture ; 

 aperture nearly horizontal, auricular, grimacing, lamellated and 

 dentate within; peristome thick, reflected, the extremities 

 approaching, and continued subparaliel into the umbilicus. H. 

 labyrinthus, Chemn. (xcvi, 86). 22 sp. Central and South 

 America. 



Cepolis, Montfort, 1810. Shell umbilicated or partly covered, 

 globosely depressed ; whorls 4^-5, the last suddenly deflected 

 at the aperture, gibbous, scrobiculate or sulcate, tuberculate or 

 plicately callous within ; aperture elongate-lvmate, peristome 

 more or less expanded, the basal margin dilated, reflected, dentate 

 or callous, ^.cepa, Miill. 9 sp. Ha^'ti, Porto Rico, Nicaragua, 

 Java, China. 



Isonieria, Albers, 1850. Shell umbilicated, depressed orbic- 

 ular; last whorl obtusely angulated on the periphery, rounded 

 in front, deviating near the aperture, ventricose at base, and 

 contracted around the umbilicus; aperture oblique, semioval, 

 with two interior teeth, one at the periphery, the other upon the 

 opposite parietal wall ; peristome thickened, reflected. H. oreas, 

 Koch (xcvi, 87). 23 sp. Northern South America. 



soLAROPSis, Beck, 1837. (Solarium, Spix, 1827. Ophiodermis, 

 Agassiz, 1837.) Shell umbilicated, orbicularly depressed, 

 flattened, conical above, convex below; last whorl obtusely cari- 

 nated and peculiarly constricted at the periphery ; aperture 

 obliquely semilunar ; peristome labiate, reflected ; columellar lip 



