36 HELICID®. 
and excavated around the columella; aperture obliquely oval ; 
peristome thickened within; columella much dilated and 
appressed. H. alauda, Fer. Cuba. 
Histrio, Pfeiffer, 1854. Uncharacterized. H. Dennisoni, Pfr. 
Cuba. 
Jeanneretia, Pfeiffer, 1877. Uncharacterized. H. Parraiana, 
d’Orb. Tsp. Cuba, Porto Rico. 
Dialeuca, Albers. Imperforate, turbinately globose; five 
whorls, the last obtusely angulate ; aperture obliquely rounded ; 
peristome simple, sharp; columella intrant, oblique, wide, flat- 
tened above. H. nemoraloides, C. B. Ad. (xev, 65). Jamaica. 
oxycHona, Morch,1852. Imperforated,trochiform; last whorl 
carinated with flattened base; peristome simple, shar p, outer lip 
inflected in the middle, columellar lip thickened. H. bifasciata, 
Burrow (xey, 74). Brazil. 
POLYMITA, Beck, 1837. (Phzedra [pt.], Albers, 1850.) Shell im- 
perforate or perforated, globular, shining ; spire small and short ; 
whorls four or five, the “last very large “and rounded ; aperture 
rounded; peristome simple, obtuse, the extremities joined by a 
transparent callus; columella oblique, widely dilated above. . 
picta, Born (xevi, 80); Cuba. 5sp. Cuba. 
Cysticopsis, Mérch, 1852. (VParthena, Albers, 1850, partim.) 
Shell imperforate, globose, shining ; whorls convex, the last ven- 
tricose; aperture large, rounded; columella short, vertical, a 
little dilated above; peristome simple. H. Cubensis, Pfeiffer. 
(xciv, 17). 20 sp. West Indies. 
Praticola, Strebel and Pfeffer. Shell globular, irregularly 
plaited, aperture expanded, thickened internally, concealing a 
part of the narrow umbilicus. Mexico. H.griseola, Pfr.,and H. 
Berlandiertana, Moric., are examples. 
Pelia, Albers, 1860. Shell imperforate, depressed, lenticular, 
thin, with concentric lineated lines, acutely carinate ; whorls five, 
slightly convex, the last with convex base, impressed in the 
middle; aperture subrhombic; peristome simple, acute. H. 
spirulata, Pfeiffer. Central America. 
Plagioptychia, Pfr., 1855. Umbilicus narrow or covered, 
depressed suborbicular, thin, small, spire scarcely elevated, 
obtuse; whorls four -and-a- half, the last suddenly deflected and 
constricted at the aperture ; aperture subhorizontal, elongate- 
lunate; peristome thin, margins approaching, the basal with a 
dentiform plica. #. loaodon, Pfr... (xcv,..10,.. 79 sp.) Haytr 
Bahamas, ete. 
Hemitrochus, Swainson, 1840. (Phedra [pt.], Albers, 1850.) 
Shell imperforate or perforate, globose, shining, spire short, 
whorls 4-5, the last large, deflected at the aperture; aperture 
contracted, subvertical, rounded - lunate; peristome simple, 
