HELIX. 



Plate CXLX. 



Species 695. (Mus. Cuming.) 



Helix perspectiva. Eel. tettd late etperspectiti umbi- 

 licaid, (kpresso-orbiculari, supeme vix conveximculd, 

 subtus excavatd, tenui, rufo-comed, regulariler cos- 

 tulaid ; anfractibm sex ad septem, convexiusculu, lenle 

 accreicenliiiu ; aperturd parvd, litnalo-sitbcirculari ; 

 peristomate acuto, marginibM diatantiljM. 



The peespective Helix. Shell broadly and perspec- 

 tively umbilicated, depressly orbicular, slightly convex 

 at the ui)))er part, excavated beneath, thin, red-homy, 

 regularly finely ribbed ; whorls six to seven, rather 

 convex, increasing slowly ; aperture smaU, lunar-sub- 

 circular ; lip simple, acute, margins distant. 



Sav, Joum. Acad. Nat. Sci. Philadelphia, vol. i. p. 18. 

 Helix patula, Deshayes. 



Hafj. North iVmerica, near Lake Erie. 



A small depressly excavated species, with the whorls 

 widely convoluted so as to form a large open perspective 

 umbilicus. 



Species 696. (Mus. Cuming.) 



Hf.i.ix convexa. Hel. testa suboblecle umbilicatd, glo- 

 boHO-depremd, diapliand, rufescente-conied, pilU hre- 

 visiimU obsitd ; spird convexiwsculd ; anfractibm quin- 

 que ad sex, supremis planitiaculis, ultimis duobm con- 

 vexis, ultimo antice gibbo, ad aperturam constricto ; 

 umbilico angiuto, pervio ; aperturd late lunari, dente 

 lamelliformi in pariete aperturali coarctatd; peristo- 

 mate acuto, reflexo, intus albo-calloso. 



The conve.k Helix. Shell with a nearly covered um- 

 bilicus, globosely depressed, diaplianous, reddish- 

 homy, covered with very short hairs ; spire rather 

 convex ; whorls five to six, the uppermost rather flat, 

 the last two convex, the last gibbous in front, con- 

 stricted at the aperture ; umbilicus narrow, open ; 

 aperture broadly lunar, contracted by a lamelliform 

 tooth upon the wall of the aperture ; lip sharp, re- 

 flected, white-callous within. 



Rafinesque, Deshayes, Encj'clopddie Mcthodique, vol. ii. 

 p. 253. 



Helix motiodon, Rackett. 

 Eadcm var., Helix fratema. Say. 



Hal). Ohio, North .Vmerica. 



A small globose species, covered with verj- short hairs, 

 which, however, are generally more or less obsolete. 



Species 697. (Mus. Cuming.) 



Helix bicostata. Hel. testa vix umhilicald, semiglo- 

 bosd, supemi subarcuatim rugoso-striatd, nilidula, ci- 

 rente-Jlavidd ; spird magit minusce eUtaid; anfracli- 

 bus septem, angustis, concexiusculit, ultimo baii nUt- 

 plano, medio impresso, l/nigato, lineis concenlrici* ob- 

 solelit tub lente nolato ; aperturd late lunari, baii 

 costis valiJii, marginem non attingentibui, munitd ; pe- 

 ristomate simplici, acuto, inargine columellari perobli- 

 quo, calloso. 



The two-bibbed Helix. Shell scarcely umbilicated, 

 semiglobose, somewhat arcuately mgosely striated at 

 the upper part, sliiiiing, greenish-yellow ; spire mon- 

 or less raised ; whorls seven, narrow, rather convex, 

 the last somewhat flattened at the base, impressed 

 in the middle, smooth, marked Ix-nciith the lens with 

 obsolete concentric lines ; aperture broadly lunar, 

 furnished at the base with two strong ribs, not 

 reaching to the margin ; lip simple, acute, columellar 

 margin very oblique and callous. 



Pfeiffeb, Symbola;, vol. iii. p. 69. 



Hab. Tennessee, North America. 



This little species partakes of the same peculiar typical 

 characters as H. Cookiana, and others collected in PI. 

 LXII., being of the same hoUow-bascd pmmidal form, 

 furnished with internal ribs or laraellie. 



Species 698. (Mus. Cuming.) 



Helix cebeolcs. Hel. testa late umiilicald, orbitmlaUi, 

 corned, obliqui costulatd ; spird planatd ' ' ui 



septem ad octo, superni angustiuiiHts. ■ .*, 



penultimo tupemi immerm), omnibtu baa amtpuruit, 

 iiutqualiler promineniibut, ultimo suprmi carimUo ; 

 aperturd reiiifurmi ; peristomate simplici, aitgulatim 

 reflexo, marginibus lamella dmtiformi juMctu. 



The uttle tapeb Hf.lix. Shell bmadly umbilicote«l, 

 orbicular, homy, obliipiely finely ribbed ; spin: flat- 

 tened ; whorls seven to eight, vcr> iiarmw at the 

 upper part, nearly etpial, penultimnte whorl iramcpictl 



August, 1852. 



