HELIX.— Plate CVII. 



Species 599. (Mus. Cuming.) 



litLix UELICYCLOIDES. Eel. testd latmimi umbilicaid, 

 dUcoided, supra coticavo-plaud, infra excavatd, t/riseo- 

 Jlavicaiile, subdiapluind ; anfracliius decern, mperne 

 pUtitatii, deiiide rotundalk ; aperlurd pared, semi- 

 lufiari ; labro simpllci, suiincrassaio, albo. 



The HELicycLoiD Helix. Shell very broadly umbili- 

 cated, discoid, concavely flattened above, excavated 

 beneath, grejish-yellow, subdiaphanous ; whorls ten, 

 flattened at the upper part, then rounded ; aperture 

 small, semilunar ; lip simple, rather thickened, white. 



D'Orbigny, Voyage dans I'Amcr. Murid. p. 246. pi. 28. 

 f. 1-4. 



Hab. Bolivia. 



.\ very depressed shell of discoid growth, convoluted on 

 a plane with the spire after the manner of the Brazilian 

 H. polyffi/rata. 



Species 600. (Mus. Cuming.) 



Helix Woodiana. Ilel. testd umbilicaid, subdepresso- 

 orbiculari, corned, pellucidd, lavigatd, nitente ; an- 

 fractibus sex, convam, ad suturam submarghmtis, ul- 

 timo obsolete obtuse carinato ; aperttird transverse In- 

 nari; labro simplici. 



Wood's Helix. Shell umbilicatcd, somewhat depressed, 

 orbicular, horny, transparent, smooth, shining; whorls 

 six, convex, slightly margined at the suture, last whorl 

 obsoletely obtusely keeled ; aperture transversely lu- 

 nar ; lip simple. 



Pfeiffek (not of Lea), Pro. Zool. Soc. 1851. 



Hab. Ceylon; Layard. 



A fme homy shell of somewhat glassy texture, with a 

 simple lip and small umbilicus. 



Fig. 601. (Mus. Cuming.) 



This little shell proves to be a variety of H. tropidophora, 

 represented at PI. CVII. Sp. 583. 



Species 602. (Mus. Cuming.) 



IIelix OlimcULA. lid. testd late uiidiilicata, subdiscouied, 

 subliliter striatuld, nitidd, diaphand, grineo-Jlacicante ; 

 spird vix elevatd, obtusissimd ; anfractibus septem ad 

 octo, convexiusculis, ultimo bast vix latiore, non descen- 

 dente ; umbilico latissimo, tertiam aiifractuum latitudi- 

 nis partem monstrante ; operturd firobliqud, rotundato- 

 lunari ; perislomate tenui, acuta. 



The little orb Helix. Shell broadly umbilicatcd, 

 nearly discoid, finely striated, shining, diaphanous, 

 greyish-yeUow ; spire but little raised, very obtuse ; 

 whorls seven to eight, rather convex, the last scarcely 

 broader at the base, not descending ; umbilicus very 

 broad, showing one-third part of the width of the 

 whorls ; aperture a little oblique, rotundateiy lunar ; 

 lip thin, sharp. 



D'Orbigny, Voyage dans I'Aindr. Murid. p. 250. pi. 27 

 f. 16-19. 



Hab. Bolivia. 



Resembling the other Bolivian species figured above it, 

 but of less discoid growth. 



