HELIX.— Plate CLXXXII. 



orbiculato-depreisd, iubducoiJeS, tenuissimii, peltucUlo- 

 comed, iinclljiif utrialo-aniiulatS ; npird depreud, aii- 

 turd caiia/iculatd ; aiifractibiix Iribits ad i/tialuor ; 

 apfrtiird partd, subcirculari, labro siiiiplici. 



The cut Helix. Shell very broadly openly urabilicatcd, 

 orbicularly depressed, subdiscoid, very tliiii, transpa- 

 rent homy, striatcly ringed throughout ; spire de- 

 pressed, suture channelled ; whorls three to four ; 

 aperture small, nearly circular, lip simple. 



Pfeiffee, Pro. Zool. Soc. 1854. 

 A very widely coiled transparent horny shell, tiic whorls 



very little increasing. 



Species 1261. (TVIus. Pfeiffer.) 

 Helix p.\llidul.\. Hel. tedd aiigiisli umhiUcatd, con- 



nexo-depreMd, tenui,pellucidd, coiifertim oblique striata; 



an/ractibiis quinqne ad sex, convexiitictdis ; aperturd 



oldiqud, late lunari, labro simplici. 

 The pale Helix. Shell naiTowly umbilicated, convcxly 



depressed, thin, transparent, closely obliquely striated ; 



whorls five to six, rather convex ; aperture oblique, 



broadly lunar, lip simple. 

 Pfeiffer, Zeitschrift fiir Malae. 1S4G. p. 128. 

 Hab. Chili? 



Of transparent homy substance, simply convoluted, 

 marked with oblique stria; and a very small umbilicus. 



Species 1262. (Mus. Cuming.) 



Helix plagiptycua. Ilel. testa angusti et profundi 

 umhilicald, oblique lurbinatd, suLtrochiforvd, fenui, 

 corned; anfractibus quatuor ad quinque, concexis ; 

 aperturd partd, subcirculari, labro simplici. 



The oBLiauELY-coiLED Helix. Shell narrowly and 

 deeply umbilicated, obliquely turbinated, somewhat 

 trochus-shaped, thin, horny ; whorls four to five, con- 

 vex ; aperture small, nearly circular, lip simple. 



Shuttlewortii, Mus. Cuming. 



Hah. Island of Porto Rico, West Indies ; Blauncr. 



A small horny species of a short trochiform shape, with 

 the suture rather impressed. 



Species 1263. (Mus. Pfeiffer.) 



Helix EGENA. lid. testd imperforatd, nemigloboto-tiirbi- 

 iiatd, glabrd, iiitidiasinta, til red; tpird cOHoideo-tU- 

 tald; anfractibus quinque ad sex, context*, lenti ae- 

 crescaitibus, ultimo baxi conrexo, medio impretto-ptmr- 

 turato ; aperturd depresso-lunari, labro simplici. 



The distressed Helix. ShcU impcrforatt'd, scmiglo- 

 boscly turbinated, smooth, verj- shining, glassy ; spire 

 conoidly raised ; whorls five to six, convex, increasing 

 slowly, the last convex at the base, imprcssly punc- 

 tured in the middle; aperture deprcssly lunar, lip 

 simple. 



Say, Jouni. Acad. Nat. Sci. Philadelphia, vol. v. p. 120. 



JIab. Philadelphia; Say. 



A minute scmiglobose glassy shell, seraipuncturcd in the 

 place of the umbilicus. 



Species 1264. (Mus. Pfeiffer.) 



Helix problematica. Hel. testa umbilicald, convexo- 

 depressd, tenui-ssimd, striaiuld, pellucidd, nitt-nte, pal- 

 lide stramined; spird contexd, apice subpromiuulo, 

 obtuso, auturd submargiu^td ; anfractibus quatuor ad 

 quinque, contexiusculis, rapide accreseeniibus, infra 

 peripheriam subangulatis, ba-u planiusculis ; aperturd 

 obliqud, subtrapezoided, labro simplici, maryine colu- 

 mellari sub umbilicum interdum expanso. 



The problematic Helix. Shell umbilicated, convexly 

 depressed, very thin, finely striated, transpiu-cnt, 

 shining, light straw-colour ; spire convex, apex rather 

 ])rominent, obtuse, suture faintly margined ; whorls 

 four to five, rather convex, increasing rapidly, slightly 

 angled below the periphery, rather fiat at the base ; 

 aperture oblique, subtmpezoid, lip simple, colomcHar 

 margin sometimes expanded over the umbilicus. 



Pfeiffer, Zeitschrift fiir Malac. 1852. p. 91. 



Hab. ? 



A ligiit transparent straw-coloured shell, of extremely 

 thin texture. 



