234 CYCLOSTOMIDA. 
CrENoPpoMA, Shuttleworth. 
Distr.—26 sp. West Indies. C. bilabiatum, Orb. (1xxvi, 
(Cie icy ye 
Shell ovate or cylindrically turreted, truncate ; aperture sub- 
circular; peristome expanded, mostly duplicate; umbilicate or 
perforate. Operculum testaceous, rather narrowly spiral, the 
whorls obliquely suleate, nucleus nearly central. 
Cycroropsis, W. T. Blanford. 
Distr.—3 sp. India, Mauritius. C. semistriata, Sowb. (1xxvi, 
it): 
Shell widely umbilicate, turbinately depressed, spirally lirate ; 
aperture subcircular. Operculum multispiral, duplex, membran- 
aceous within, testaceous externally with the margins of the 
whorls elevated. 
CHOANOoPOMA, Pfeiffer. 
Distr.—55 sp. W. Indies. C. lima, C. B. Ad. (Ixxvi, 78, 79). 
Shell globular-turbinated or turreted, spire frequently trun- 
cated ; aperture suboval or circular ; peristome usually double, 
reflected. Operculum testaceous, the margins of the whorls 
usually free, ribbed. 
LICINA, Gray. Last whorl sometimes detached near the aper- 
ture ; peristome subreflected. C. evoluta, Reeve (Ixxvi, 80). 
JAMAICEA, C. B. Adams. Shell umbilicated, globular-conic ; 
peristome simple or double, straight or reflected. Operculum 
externally convex, its whoris obliquely striated, sublamellar. 
C. anomala, Ad. (1xxvi, 81). 
CuHonpropoma, Pfeiffer. 
Distr.—100 sp. West Indies. C. magnificum, Sallé (Ixxvi, 82). 
Shell oblong-turreted, or globular-turbinated, frequently the 
apex is truncated; aperture oval; lip simple or more or less 
double, nearly direct, a little expanded or reflected. Operculum 
oval, subcartilaginous, flat, paucispiral. 
CIsTuLaA, Gray. 
Distr.—42 sp. West Indies and neighboring continent. C. 
Sauliz, Sowb. (1xxvi, 83). Z 
Shell globular-conic or oval, or oblong-turreted, apex usually 
truneated ; aperture oval; peristome single or double, reflected. 
Operculum thin, cartilaginous, paucispiral, with rapidly enlarging 
whorls. 
Tupora, Gray. 
Distr.—34 sp. West Indies and neighboring continent. 7. 
mumia, Lam. (Ixxvi, 84). 
Shell oval-oblong or turreted ; aperture oval, angular posteri- 
orly ; peristome single or double, expanded. Operculum oval, 
