HELIX. 



Plate CXIII. 



Species 646. (Mus. Cuming.) 



Helix bilamellata.. Hel. lestd umbiUcald, coiiicd, 

 tenui, cornea, longiiudinaUter valide el regidariter 

 plicatd; spird elonyatd, aursiim valde atte)iuatd, 

 acuta; anfractibiis novem, carinalk (carina exser/d, 

 acutd, suLuculeatd) , uU'nno basi convexhisculo ; unilii- 

 lico angusto, pervio ; aperlurd subverlicali, siibqita- 

 drangulari, lamellk dnabm coarclatd, altera intranle 

 in parielc aperturali, altera crassiore ad columellam ; 

 periMoniate simpl.ici, recto. 



TiiK lULAMELLATED Helix. Shell uiiibilicatcd, conicul, 

 thin, homy, longitudinally strongly and regularly 

 j)licated ; .spire elongated, much attenuated and sharp 

 towards the upper part ; whorls nine, keeled (keel 

 exserted, sharp, slightly prickly), last whorl rather 

 convex at the base ; umbilicus naiTOw, open ; aper- 

 ture subvertical, quadrangular, contracted by two 

 lamella;, one entering on the wall of the aperture, 

 the other thicker, upon the columella ; lip simple, 

 straight. 



Pfeiffeb, Zeitschrift fiir Malac. 1845. p. 84. 



Ilab. Island of Opara, Pacific Ocean ; Cuming. 



A minute horny pjTaraidally conical shell, with one 



lamella on the inner surface of the body-whorl, the other 



on the columcUa. 



Species 647. (5Ius. Cuming.) 



Helix contorta. Hel. lestd umbiUcald, deprcssd, tenui, 

 fragili, utriatd, tenuisnime pilosd, luteo-Jtatd,Jlammidiis 

 longitudinaliitts rubris pictd ; spird vix convexd; an- 

 fraclibus ([uatuor ad quinque, convexis ; umbilico lata, 

 pervio ; aperlurd subrolundd, dentatd, lamellis paral- 

 lelis duabus inlranlibus, parietem aperturalem, coarc- 

 tantiius ; peristomate simpUci, acuto, margine dextro 

 dentibus acutis munilo. 



TiiK TWISTED Helix. Shell umbdicatcd, depressed, 

 thin, fragile, striated, very finely hairy, yellowisii, 

 painted with red longitudinal flames ; spire but little 

 convex ; whorls four to live, convex ; umbilieus broad, 

 open ; aperture somewhat round, seven-toothed, with 

 two parallel lamella;, entering and contracting tiic 

 wall of the aperture ; lip simple, sharp, right margin 

 furnished with live sharp teeth. 



Feklssac, Hist. Moll. pi. 51 A. f. 2. 

 Helix inlercarinata, Mighels. 



Hab. Sandwich Islands. 



-V small cycloid species, characterized by a complicated 



arrangement of teeth aud lameiUc in the aperture. 



Species 648. (Mus. Cuming.) 



Helix SEXLasiellata. Hel. testd anguslimme vmbili- 

 cald, aubsemiglobosd, tenui, reyulariler coitulatd, lutet- 

 cenlf, maculis castaneia tetiellald ; tpird elevald, o6- 

 tusd ; anfractWm lex, convexis, angustis, ultimo bati 

 planulato ; aperlurd depressd, obli//ue lunari, lamellit 

 acute elevtttis coarclatd; triins paralUlis in ventre nn- 

 fracti'is penullimi, triius in /undo aperlura- Ulit oppu- 

 silis,, pluribus minoribua obsoletia inlerjectit ; peritto- 

 mate siniplici, acuto. 



Tue six-lamellated Helix. Shell very narrowly uiu- 

 bilieated, somewhat scmiglobosc, thin, nigulnrly finely 

 ribbed, yellowish, tessellated with chestnut spots ; 

 spire raised, obtuse ; whorls six, convex, narrow, the 

 last flattened at the base; aperture depressed, ob- 

 liquely lunar, contracted by six sharply niised lainelUe, 

 three parallel in the body of the penultimate whorl, 

 three at the bottom of the aperture opposite to them, 

 with many smaller obsolete ones lying between ; lip 

 simple, sharp. 



Pfeifier, Zeitschrift fiir ^lalac. 1845. p. 85. 



Hab. Gambler Island, Pacific Ocean. 



Another small species with a complicated arrangement 



of lamella; in the aperture, but of very dilTcrcnt form. 



Species 649. (Mus. Cuming.) 



Helix MARMORELLA. Hel. testd umbilicatd, depreua, 

 tennissimd, dislanler cosletlatd, pellucidd, straminrn, 

 slrigis obliquis el maculis rufis marmorata ; spird 

 plana; anfraclibus tribus, cix conrexiusculis, rnpide 

 accrescentibus, ultimo basi panto eonrexiore ; apertHrd 

 perobliqud, ampld, lunato-ocali ; perittomatt timplici, 

 acuto, marginibus callo tenui junctis, suprro antromm 

 subarcuato. 



The finely-marbled Helix. Shell umbilicated, de- 

 pressed, very thin, distantly finely ribbed, tmnspn- 

 reiit, straw-colour, marked with obli(|uc red streaks 

 and spots; spire flat; whorls three, slightly convex, 

 increasing rapidly, the Inst a little niori' convex at 

 the base; ajicrturc very oblique, large, luuar-OTnl ; 

 lip simple, sharp, margins joined by a thin callosity, 

 upper margin a little arched fonvnrd. 



Pfeiffer, Pro. Zool. See. 1845. p. 125. 



Hab. Juan Fernandez. 



A very delicate /.ebra-likc paintcil species. 



Species 650. (Mus. Cuming.) 

 Helix iiELicoriiANTOiDEs. //*/. lettd Hmbilicatd, dt- 

 pressd, tenui, oblique et coi\fertim costulato-ttnald. 



August,! 852. 



