HELIX.— Plate XCII. 



at tlie aperture, which is very oblique and lunar-roun- 

 fled ; lip white, thin, broadly reflected, margins ap- 

 proximating, columellar margin luruished with a pro- 

 mineut tooth. 



Fekussac, Hist. Moll. pi. 70. (. 1, and pi. 73 .V. f. 1. 

 Eadem var. Ilelu: Thdis, Pfeiflfcr. 



Hab. ? 



A solid ivory-white shell, encircled with black-brown 

 bands or lines, and an upper light reddish band. Dr. 

 Pfeiffer's H. Thetig is a specimen with the umbilicus rather 

 less covered over. 



^'' 



Species 502. (Mus. Cuming.) 



Helix coRNiccLnM. IIel.teddumhilicatd,depresso-orbi- 

 culari, pellucido-albd, zond intemi fused, apicem verms 

 purpurascente tincld, cingulatd ; spird coiivexd, apice 

 sttbimpressd ; anfradihus quatuor ad quinque, plaiw- 

 convexis, ultimo basi pone labrum comtrwto ; aperturd 

 Hubciradari ; perislomate temd, cxpanso,parum reflexo. 



The little houn Helix. Shell umbilicated, depressly 

 orbicular, transparent wliite, encircled with a dark 

 brown zone, which is stained towards the apex with 

 light puqde ; spire convex, rather impressed at the 

 apex ; whorls four to five, flatly convex, the last con- 

 stricted at the base behind the lip ; aperture nearly 

 circular ; lip thin, expanded, but little reflected. 



P*HPFE« <Mus. Cuming). 



Hab. ? 



This species is about intermediate in its characters be- 

 tween //. coluber and tortilahia. 



Species 503. (Mus. Cuming.) 



Helix zonakia. Uel. ttttd umiilicald, orbiculaUMle- 

 pressd, glabra, tenuis»ime striata, aliida, fuaco, ru/o el 

 livido carii zonald et nubeculatd ; spird plana, rnet/io 

 paululum immersd; an/raciiius quinque, supemi pta- 

 niusculis, rapide accrescentibus, ultimo descendente, de- 

 presso, basi subplanulato, juxta mnbilicum anijustum 

 ci/lindricum scrubiculalo ; aperturd perobliqud, ocali ; 

 perislomate acuta, margine supero expanso, in medio 

 impresso, basi reflexo, juxta columellam obtuse dentato. 



The aiKDLEU Helix. Shell umbilicated, orbicularly de- 

 pressed, smooth, ver.' linely striated, whitish, variously 

 zoned or clouded with brown-red and livid bands ; 

 spire flat, a little immersed in the middle ; whorls 

 five, rather flat at the upper part, increasing rapidly, 

 the last descending, depressed, rather flat at the base, 

 scooped out next the narrow cylindrical umbilicus ; 

 aperture very oblique, ovid ; lip acute, upper margin 

 expanded, impressed in "the middle, reflected at the 

 base, obtusely toothed next the columella. 



I.iNN.i:us, Syst. Nat. (12th edit.) p. 1245. 



J fab. Molucca Islands. 



This shell, which is regarded as the Linna'au type of the 

 group, is of rather a solid contracted growth, variously 

 marked with livid bands and lines. 



