HELIX. 



Plate CXI. 



Species 626. (Mus. Cuming.) 



Helix subtilis. Hel. testa imperforatd, depreisd, tener- 

 rimd, nitidd, palUde corned; spird vixexsertd; an- 

 fractibus quatitor ad quinque, planimculis, seus'wi ac- 

 crescentibus, ultimo basi paulo convexiore ; suturd in- 

 ierdum rufo-marginatd ; aperturd transverse lunari ; 

 per'ntomate simpUci, acuta. 



The delicate Helix. Shell imperforated, depressed, 

 verj' thin, shining, pule horny ; spire but little ex- 

 serted ; whorls four to five, rather flat, increasing 

 slowly, the last a little more convex at the base ; 

 suture sometimes edged with red ; aperture trans- 

 versely lunar ; lip simple, sharp. 



Antok, Verz. p. 35, Chemn. Conch. Cab. (Kuster's edit.) 

 Helix, pi. 29. f. 33-35. 



Hab. Island of Ohetaroa, South Pacific ; Cuming. 



A dull shitdng horny species, of simple character. 



Species 627. (Mus. Cuming.) 



Helix ex^tiquata. IleL testa imperfaratd, discoided, 

 tenui, liicidd, glabratd, corned, ad per'iplteriam rotunda- 

 td, infra subpland, in foveam centralem devexd; anfrac- 

 tibus septem, arete volutis, siipra planulatis, suturd 

 marrjinatd, bene impressd, dUcretis, spiram plaiiam ef- 

 fomiantibus ; aperturd angtistd, transversa ; labro sim- 

 pUci, portione sinistra fere horizontals, recedente, sub- 

 reflexd. 



The levelled Helix. Shell imperforated, discoid, 

 thin, lucid, smooth, horny, rounded at the periphery, 

 rather flattened beneath, declining into a central pit ; 

 whorls seven, convoluted in an arched manner, rather 

 flattened above, separated by a well-impressed suture, 

 forming a flat spire ; aperture narrow, transverse ; 

 lip simple, left portion almost horizontal, receding, a 

 little reflected. 



Gould, Expedition Shells, f. 9. 



Hab'. Sandwich Islands. 



A flattened discoid shell, rounded at the periphery. 



Species 628. fMus. Cuming.) 



Helix bbunnea. Uel. testd imperforatd, vrbiculato-con- 

 vexd, nitidissimd, saturate fulcd, superne punctis albis 

 compersd; spird convcxiusculd ; anfraclibus quatiior 



ad quinque, tubplanulalii, tentim accreiceniiiiu, ul- 

 timo basi concexiusculo, medio impretso ; aperturd ro- 

 tundalo-lunari ; perislomate acuta, simplici, lenuisti- 

 ma, loco umbilici suiincrastato. 



The BnowN Helix. Shell imperforated, orbicularly 

 convex, very shining, dark yellow, sprinkled about 

 the upper part with whito dots ; spire rather convex ; 

 whorls four to five, rather flattened, increasing slowly, 

 the last rather convex at the base, impressed in 

 the middle ; aperture rotundately lunar ; lip sharp, 

 simple, ven,' thin, sliglitly thickened in tlie place of 

 the umbilicus. 



Antok, Verz. p. 35. 



Hab. Pitcairn's Island ; Cuming. 



Distinguished by its sliining bright brown colour, 

 sprinkled with white dots. 



Species 629. (Mus. Cuming.) 



Helix dissimilis. Hel. testd tuMlicntd, depreud, 

 tenui, superne confertim plicatuld, pallide corneo-slra- 

 mined, superne maculis el flammii irreijularibui, basi 

 punctis rufis ornatd ; spird pland ; suturd profunda ; 

 anfraclibus quinque, conrexia ; umbiUco inagno, perrio ; 

 aperturd vix obliqud, rolundato-lunari ; perittomalt 

 simplici, acuta. 



The dissimilak Helix. Shell umbilicnted, depressed, 

 thin, closely finely plicated at the upper part, |>alc 

 horny-straw, ornamented about the upper part witli 

 red spots and flames, and at the base with faint dots ; 

 spire flat ; suture deep ; wliorls five, convex ; umbi- 

 licus large, open; aperture a little oblique, rotun- 

 dately lunar; lip simple, acute. 



D'Okbigny, Voy. dans I'Amer. Merid. p. 2J7. pi. i(- 

 f. 18-21. 

 Helix histrio, Muhlfcldt. 



Hab. Conccpcion, ChiU ; D'Orbigny. 



Painted in a very characteristic manner obo\it ihc upper 



part with red-brown spots and flames. 



Species 630. (Mus. Cuming.) 

 Helix laMEI.LOSA. Hd. trstd umbiUeald, IfitticHlart, 

 tenui, nitidd, glabra, acute cartHatd, Jtaretcrnte, macu- 

 lia et Jtammis rufa ornatd; spird tubelevald ; oMfrac- 



August, 1852. 



