HELIX.— Plate CXI. 



iibus septent, planis, ultimo bad injlalo, ad umiiliaim 

 mediocrem ci/tindricum angulato ; aperlurd depresxd, 

 Irapezid, lameliis magnis duabttn in pariete aperttirali, 

 pliirimis minoribus in margine columellari, qualuor in 

 bnsa/i, una in atipero. 



The l.vmellose Helix. Shell umbilicated, lens-shaped, 

 thiu, shining, smooth, sharply keeled, yellowish, or- 

 namented with red spots and flames ; spire slightly 

 raised ; whorls seven, flat, the last inflated at the 

 base, angled about the umbilicus, which is middling 

 and cylindrical ; aperture depressed, trapezoid, fur- 

 nished with two large lamella; on the body-whorl, 

 and several smaller ones, one on the columellar mar- 

 gin, four on the basal, and one on the upper margin. 



FriiissAC, Hist. .Moll. pi. 51 A. f. 3. 



Hab. Sandwich Islands. 



Resembling the former species in respect of painting, 

 i)ut of a totally diflerent form, being Icns-shapcd, with a 

 sharp periphery-, and having numerous lamellae within the 

 aperture. 



Species 631. (Mus. Cuming.) 



Helix Jacquinoti. Hel. testa umbilicatd, depresso- 

 conoided, soliduld, acute carinatd, coufertim arcuato- 

 costatd, fulvo et rufo variegatd ; anfractibus octo, an- 

 gmtis, subcoNcavis, omnibus carinatis, carind exsertd, 

 compressd, costis decurrentibus dcnticulatd, nnfraciu 

 ultimo basi vix convexiiisculo, radiatim striata; um- 

 bilico amplo, lamind horizontali coarctato ; aperturd 

 depressd, securiformi, lameliis sex intrantibus munitd; 

 perislomate simplici, acuta. 



Jacqi'inot's Helix. Shell umbilicated, depressly co- 

 noid, rather solid, sharply keeled, closely arcuately 

 ribbed, variegated with fulvous and red ; whorls 

 eight, narrow, slightly concave, all keeled, the keel 

 being exscrted and compressed, and denticulated at 

 the edge by the dccurreiit ribs, last whorl sliglitly 

 convex at the base, radiately striated; umbilicus 

 large, contracted by a horizontal lamina ; aperture 

 depressed, wedge-shaped, furnished with six entering 

 lamella; ; lip simple, sharp. 



Pfeiffer, Pro. Zool. Soc. 1S19, p. 128. 



Hab. Tahiti and Marquesas Islands. 



A prettily painted Solariiform shell, sculptured with fine 

 ribs which run over iirul denticulate the periphery. 



Species 632. (Mus. Cuming.) 

 Helix nisella. £lel. testa imperforatd, orbiculato-con- 



vexiusculd, ienui, obioletissime ttrialuld, nitidd, pel- 

 lucidd, pallidi corned; anfractibus quinjue ad sex, 

 planiusculis, ultimo carinato, bati convexiuseulo, medio 

 impresso ; aperturd subverticali, anguloto-lunari ; pe- 

 ristomate simplici, teiiui, margine columellari oblique 

 arcuato, subincrassato. 



The poor Helix. Shell imperforated, orbieuhirly rather 

 convex, thin, very obsolctely finely striated, shining, 

 transparent, pale horuy ; whorls five to six, rather 

 flat, the last keeled, rather convex at the base, im- 

 pressed in the middle ; aperture nearly vertical, angu- 

 larly lunar ; lip simple, thin, coliuncUar margin ob- 

 liquely arched, rather thickened. 



Fercssac, Voyage de Freycinet, Zool. p. 473. 



Hab. Molucca and Sandwich Islands. 



A smooth bright transparent yellowish glassy shell. 



Species 633. (Mus. Cuming.) 



Helix Tcckebi. Hel. testa umhilicatu, depressd, ienui, 

 peUucidd, oblique striatd, breviter el sparsim pilosd, 

 fusco-corned, rufo obsolete unicingulatd ; spird tix 

 elatd; anfractiius quatuor, planimcnlis, ultimo aniici 

 gilbo, constricto, subitu defexo ; umbilico angusto, per- 

 vio ; aperturd perobliqud, subcirculari ; perislomate 

 intus albido, undique breviter reflexo, marginibus ap- 

 proximalis. 



Tucker's Helix. Shell umbilicated, depressed, thin, 

 pellucid, obliquely striated, sparingly short-haired, 

 brown-horny, encircled with an obsolete red line ; 

 spire but little raised ; whorls four, rather flat, the 

 last gibbous in front, constricted, suddenly deflected ; 

 umbilicus narrow, open; aperture very oblique, 

 nearly circular ; lip whitish within, shortly reflected 

 throughout, with the margins approximated. 



Pfeiffer, Symltola;, vol. iii. p. 77. 



Hob. Hardy's Island, Pacific Ocean. 



Encircled with a single reddish line just above the pcri- 

 pheiy, beneath which it is whitish. 



Species C3 1. (Mus. Cuming.) 



Helix callifeba. Hel. testa imperforatd, subdepreuo- 

 orbiculari, infra convexiore, lavigald, peUucidd, ni/idd. 

 rivide corned; spird obtund : anfractibus quatuor acf 

 quinque, concexis, ad suturant tenuiniarginatis ; aper- 

 turd lunari; perislomate simplici, prope coluueUam 

 calloso. 



The callous Helix. Shell imperforated, somewhat de- 



