HELIX. 



Plate CXVOI. 



Species 685. (Mus. Cuming.) 



Heli.x spinosa. Ilel. testa obtecte umbiUcaia, lenticulari, 

 tenui, comeo-fuacd, /linpida, had convexa ; spirit vix 

 elevatd ; anfractibus sex, planU, lente accrescenlibm, 

 uUimo antice yibho, subdejlexo, acutisslmi cariimto ; 

 ajier/iird depressd, transversa, suhlineari, clente maijutj 

 linguiformi oblique irdrante in tolo pariele aperturali 

 coarctatd ; perislomate calloso, margine supero reflexo, 

 basa/i introrsnm incrassato, obsolete denficiilalo. 



The spinous Heli.x. Slicll with a covered umbilicus, 

 lenticular, thin, horny-brown, hairy, convex at the 

 base ; sjjire scarcely raised ; whorls six, flat, increas- 

 ing slowly, last whorl gibbous in front, a little de- 

 flected, very sharply keeled ; aperture depressed, 

 transverse, nearly linear, contracted by a large 

 tongue-shaped tooth, obliquely entering ail along the 

 wall of the aperture ; lip callous, upper margin re- 

 flected, basal inwardly thickened, obsoletcly toothed. 



Carocolla spinosa, Lea, Obsenations, vol. i. p. 114. pi. 15. 

 f. 35. 



Helix spinosa, Binney. 



Hah. Alabama, Tennessee, North America. 



A peculiarly flattened lens-shaped shell, characterized 

 by a long erect linguiform tooth upon the body-whorl, 

 which almost closes upon the aperture. 



Species 686. (Mus. Cuming.) 



Helix fallax. Hel. testa umbilicatd, depresso-globosd, 

 costulato-striatd, corneo-luted; spird convexa; anfrac- 

 tibus sex, convexiitsculis, ultimo antice dejiexo, con- 

 stricto ; aperturd trisinuosd, dente parielis aperturatis 

 magno lingu'iformi oblique arcuatim intrunte coarctatd; 

 peristomate rejlexo, intus calloso, albo, bidentato, dente 

 superiore introrsum Jlexo, a margine remoto, allero 

 suh-basaU. 



The false Helix. Shell umbilicated, depressly glo- 

 bose, finely rib-like striated, horny-yellow ; spire 

 convex ; whorls six, rather convex, the last deflected 

 and constricted in front ; aperture tri-sinuous, con- 

 tracted by a large oblique tongue-shaped tooth, en- 

 tering upon the wall of the aperture in an arched 

 manner ; lip reflected, callous witliin, white, two- 

 toothed, upper tooth bent inwardly, remote from the 

 margin, the other sub-basal. 



Say, Journ. Acad. N'at. Sci. Philadelphia, vol. v. p. liy. 

 HcJ/. North America, Virginia, Texas, Philadelphia. 



A small compact shell, of a light scmitrnnsparent honi\ 

 texture, peculiarly constricted round the ai>crturc. 



Species 687. (Mus. Cuming.) 



Helix ventrosula. Uel. testa angiule umliUicatd, i!,- 

 presso-globosd, tenui, subliliter striata, pelluciild, cir- 

 neo-alhida; spird vix elevatd; anfractihus quinque, 

 vix concexiusciilU, ultimo supeni tubangulato, siMli) 

 dejlexo, hasi injlato, antice giltljo el calJe amttnrt'j . 

 aperturd perolAiqud ; peristomate acuta, late rrjirm. 

 marginibus vix conniventibus, laminas elevatai in rentrt 

 anfractm penultimi angulatim junctas emiltenlibHi. 

 dextro lamina subperpendiculari dilatato, basali den- 

 tibus acutis tnunito. 



The swollen Helix. Shell narrowly umbilicate<l, de- 

 pressly globose, thin, finely striated, pellucid, horny- 

 white ; spire but little raised ; whorls five, rather 

 convex, the last slightly angled at the upper part, 

 suddenly deflected and inflated at the base, gibbous' 

 and much eonstrirtfd in front ; aperture ver)' obliqu( . 

 lip shaq), broadly reflected, margins a little approxi- 

 mating, emitting raised angularly joined lameUic on 

 the body-whorl, right margin dilated into a marly 

 perpeudieular lamina, basal furnished with two sharj) 

 teeth. 



Pfeiffer, Pro. Zool. Soc. 1845, p. 131. 



Ilab. Mexico; Hinds. Texas; Sowerby. 



Somewhat like the last species in general aspect, but 

 smoother, more swollen, and characterized by a pi-culiar 

 triangular lamella on the body-whorl. 



Species 688. (Mus. Cuming.) 



Helix KedfIELDH. Jfel. testa angmti KmiUicatd, mb- 

 globoso-turbinatd, tenui, cenfricoid, cameo-futcttettUe . 

 spird subacuminald ; ni{fraclibut quinque, coHCnri-i, ob- 

 lique plirnto-strialis, liiieis npinilibH* minuli* imprrue 

 deciusalis ; aperturd tubcirculari ; pfriMtomatt Imui, 

 marginibus conniceiilibui, coltmellari brtviler dilalalo. 



Beiifields Helix. Shell narrowly umbilicated, some- 

 what globosely turbinated, thin, ventricosc, li!;ht 

 flesh-brown ; spire somewhat acuminated ; whorU 



.\ugust, 1852. 



