CYCLOSTOMA.—Puiare V. 
anfractibus plano-declivibus, deinde acute laminato- 
bicarinatis, undique subtiliter decussatim striatis, ulti- 
mo circa umbilicum tenuilirato ; apertura subcirculari, 
labro crassé reflexo-fimbriato, marginibus posticé cal- 
loso-appressis. 
cLosED CycLostoma. Shell with a covered um- 
bilicus, depressly orbicular, livid-fulvous, tinged with 
rust, whorls flatly sloping, then sharply laminately 
two-keeled, everywhere finely decussately striated, 
last whorl delicately ridged around the umbilicus ; 
aperture nearly circular, lip thickly reflectedly frilled, 
margins callously appressed posteriorly. 
Morcu, Cat. Yold. p. 39. 
Hab. Madagascar. 
THE 
There is some doubt of this being a dwarf state of the | 
preceding species, with the umbilicus contracted and closed 
over by the callous thickening of the reflected lip, as in C. 
bicarinatum and others. 
Species 27. (Fig. a, 6, Mus. Cuming.) 
CycLostoMa vIRGO. Cyel. testé modicé umbilicatd, sub- 
globoso-turbinatd, tenui, semipellucidd, fulvescente- 
alba, fasciis duabus subdistantibus rufo-fuscis cingu- 
lata, anfractibus declivi-convexis, undique pulcherrime 
decussatim scabroso-striatis; apertura oblique circulari, 
labro eapanso-reflewo, super umbilicum late laminato- 
appresso. 
Tur vrretn CycLtostoma. Shell moderately umbili- 
cated, somewhat globosely turbinated, thin, semi- 
transparent, fulvous-white, encircled with two rather 
distant red-brown bands, whorls slopingly convex, 
everywhere very beautifully decussately scabrously 
striated ; aperture obliquely circular, lip expandedly 
reflected, broadly laminately appressed over the um- 
bilicus. 
Prerrrer, Pro. Zool. Soc. 1854, p. 150. 
Hab. Madagascar. 
A shell of delicate semitransparent substance, exqui- 
sitely minutely sculptured throughout with a decussation 
| of scabrous striz. 
