HELIX. 



Plate CLXXIII. 



'Fignrcs magtiifitd to about t«icc the natural sizi 



sjieciCd iltJS. (.\1lis. Ijensoii.) 



Helix kejiota. Ilel. leita umbUicatd, depresaa, iiilidia- 

 coideii, tenui, sublavigaUt, parum nilidd, diapliaitd, 

 coriieo-lu/ewente ; spiru plnniimculd ; aiUitrd impressd, 

 marffiiiatd ; aiifradiltm qualuor ad quiiique, coiitexi- 

 usculk, idllmo laliore, depresm, non deiiceiidett(/',iasi 

 vix coiivexiore ; umbilico iiiedlocri, aperto ,- aper/urd 

 parum obliqua, late lunuri ; peristomate nimplici, recto, 

 marijinihm vix connivenl'dim, columellari arcualo-de- 

 clivi. 



The distant Helix. Shell umbilicatcd, depressed, 

 rather discoid, thin, smooth, but little shining, dia- 

 phanous, lioniy-ycllow ; spire rather flat ; suture im- 

 pressed, margined; whorls four to five, rather con- 

 vex, the last broader, depressed, not descending, 

 scarcely more convex at the base ; umbilicus mid- 

 dling, open ; aperture but little oblique, broadly lu- 

 nar ; lip simple, straight, margins rather approxima- 

 ting, columellar margin arcuately slanting. 



Benson, Ann. and Mag. Nat. Hist. 1S51, vol. \-ii. p. 203. 



Hab. St. Helena (under stones in elevated places) ; Benson. 



A light thin horny discoid shell, rather deeply umbi- 

 licatcd. 



Species 1169. (JIus. Beusuuj 



Heli.x i'ETROBIA. IIl'I. testa subangtisle sed prof undi um- 

 bilkald, globoso-dkcoided, undique dense subliliter cos- 

 tulalo-slriatd, fuho-fitscd, siibliis o/ivaceu, sericed ; 

 spird coHvexd ; mtttrd impressd ; aiifraclibiis quatuor 

 ad quinqiie, rolundatis ; aperturd lunari ; perislomale 

 simplici, ad umbiUcum breviter rejlexo. 



The stone-uwellinc Heli.x. Shell rather narrowly 

 but deeply umbilicated, globosely discoid, densely 

 finely rib-like striated throughout, fulvous-brown, 

 olive underneath, silky ; spire convex ; suture im- 

 pressed ; whorls four to five, rounded ; aperture lu- 

 nar ; lip simple, shortly reflected at the umbilicus. 



Benson, Ann. and Alag. Nat. Hist. 18.51. 



Hab. High Constantia, Cape of Good Hope; Benson. 



A small silky brown globosely discoid species, dense iv 

 finciv rib-like striated. 



Species 1170. (Mus. Benson.) 

 Helix KEiiFcnA. //«/. tesld umbUicatd, obtuse troc/iifomii, 



October, 



si/ ' 'Id, liiwis uonnullis ■ eUtatu 



rtl liiiatd, diap/iaiid, seri<-i _ - eoriied ; 



spird etecatd, obtusd ; aiifraciibus lex ad septem, pla- 

 niuscutis, ultimo basi »r' ' ' ' ' 'llico me- 



diocri, percio ; apertur ,i ; peri- 



stomate simplici, acuta, margine supero brevi, batali 

 plane arcuuto. 



TuE NET-BEAKING Helix. Shell umbilicated, obtusely 

 trochus-shaiKd.striately plicated, reticulated with some 

 raised couceutric lines, keeled, diaphanous, silky, pale 

 homy ; spire elevated, obtu.se ; whorls six to seven, 

 rather flat, the last rather flat at the li ■d; 



umbilicus middling, open ; aperture depi' .Re- 



shaped ; lip simple, acute, upper margin short, basal 

 flatly arched. 



Pfeiffeii, Pro. Zool. .Soc. 181.), p. 73. 



Hab. Nilgherries, India ; Jcrduii. 



Of a distinct TVoeAiM-shaped growth, keeled at the Liasol 

 periphery. 



Species 1171. (Mus. Benson.) 

 Helix bisculpta. Hel. testa umbilicald. orbiculato-de- 

 pressd, translucente, parum nilidd, • ra 



rn/esceiite, utriiique eU-ganter cn.j :lo- 



plicatd, plicarum verticalium interstitiia loiigittidina- 

 liler strialissimis, >i," ' ' ' rd 



depreiso-concexd, iij^ </, 



anfractibus qualuor ad quiiique, coiivexis, tatti accres- 

 centilius, ultimo non descendente, rotunda/- ■ " --;i- 

 vexiore ; aperturd certicali, lunari; pt. ,i- 



plici, acuta, margine columellari arcuato, deciici, crai- 

 siusculn, supra breviter late rejlexo, /..,,im„„i /,-.'....'.«. 

 larem furmante. 

 The doublv-scclptured Helix. Slali 1, 



orbicularly depressed, transparent, but i ig, 



homy beneath, reddish above, elegantly very dcwcly 

 plieately striated on each sidi •< of the ver- 



tical striiL- much strinivd, n with spiral 



striic ; spire dcpressly convex, sroootb and obtUK- at 

 the apex ; suture deep ; whorls four to five, convex, 

 increasingly slowly, the Inst not descending, rouudcti, 

 more convex beneath ; aperture vertical, lunar ; lip 

 simple, acute, itilumellar margin arcuately slanting, 

 rather thick, shortly broadly reflected above, forming 

 a triangular lamina. 

 Benson, Ann. and Mair. Nat. Hist. 1S51, vol. vii. p. 103. 



IS,'-.:). 



