HELIX.— Plate CXXI. 



Species 719. (Mus. Cuming.) 



Helix gulakis. lid. tesld mbunMlkatd, orliculalo-con- 

 vexd, temti, strialuld, nitidd, luleo-corned ; anfraclibm 

 quinque ad Kx, anguftU, planiusculU; aperturd lunari, 

 iuliit deiitiiui plici/ormiiio, margiiie basnll adiial'm, ex- 

 tui cottspicuit, coarclatd; perUtomale timplici, acuta. 



The gullet Helix. Shell sliglitly umbilicated, orbicu- 

 larly convex, thin, finely striated, shining, yellowish- 

 horny ; whorls five to six, narrow, rather Hat ; aper- 

 ture lunar, contracted by two plait-like teeth, whicii 

 extend to the margin, and are conspicuous from 

 without ; lip simple, acute. 



Say, Joum. Acad. Nat. Sci. Philadelphia, vol. ii. p. 15G. 



Hab. Ohio, Pennsylvania, North America. 



The internal plait or plaits extend for some little dis- 

 tance within the aperture, and are seen from the outside. 



Species 720. (Mus. Cuming.) 



Helix avara. Hel. testa rmato-umbilicatd, depreisd, 

 driatd, kispidd, fitsco-conied ; spird hmimmd ; aii- 

 fractibits quinque, planimculk, ultimo ban umbilicum 

 latum lion pervium formante ; aperturd brevi, coarc- 

 latd, triangulari-subreniformi ; peristomate rejlexo, 

 rnarginibus denle magna nncittato junctis, basili dente 

 majuscule iriangulari, dextro dente latiore illi approxi- 

 niaio, munilis. 



The gkeedy Helix. Shell rim-like umbilicated, de- 

 pressed, striated, hair\-, brown-horny ; spire very 

 short; whorls five, rather Hat, the last forming at 

 the base a broad closed umbilicus; aperture short, 

 contracted, triangularly somewhat kidney-shaped ; 

 lip reflected, m;u'gius joined by a large hooked tooth, 

 basal margin furnished with a rather large triangular 

 tooth, right margin with a broader tooth near to it. 



Polygyra nvara. Say, Joum. Acad. Nat. Sci. Philadelphia, 

 vol. i. p. 277. 

 Jlelix Sayi, Wood. 



Hab. Louisiana and West Florida. 



The mouth of this species is nearly closed up by the 

 strong development of the lip and marginal teeth. 



Species 721. (Mus. Cuming.) 



Helix plstcla. Hel. testa umbilicatd, depressd, minuti 

 itriatuld, rti/o vel pallide corned; spird vix elevald ; 

 anfrnclibus quatuor ad quinque, vix concexiunculis, ul- 

 timo fjaxi convexiorr, anticc breviler dijlexo, constricio : 

 aperturd obliqud, angttstd, ainualo-lunari ; peristomate 

 brevilpr rejlexo, viarginiius dente mediucri linguiformi 

 junctis, basali diUitalo, dentibus approrimatis munilo. 



The pustule Helix. Shell umbilicated, depressed, mi- 

 nutely striated, reddish or jialc horny ; si)ire scarcely 

 raised ; whorls four to five, slightly convex, the last 



more convex at the base, shortly deflected and con- 

 stricted in front ; aperture oblicjue, narrow, sinuately 

 lunar ; lip shortly reflected, margins joined by a mid- 

 dling tongue-shaped tooth, basal margin dilated, fur- 

 nished with two approximating teeth. 



Ferussac, Hist. Moll. pi. 50. f. 1. 



Hab. Texas. 



This appears to be the smallest of the North American 

 species, distinguished by an oblong tongue-shaped loolh 

 on the body-whorl. 



Species 722. (Mus. Cuming.) 



Helix leporina. Hel. testd anguste umbilicatd, depres- 

 siusculd, fusco-corned, oblique striaid ; spird convexd ; 

 anfractibus quinque, convexis, ultimo obtuse carinato; 

 aperturd obliqud, angustd, dente linguiformi laminari 

 in pariete aperturali intranie ; peristomaie erecto, sui- 

 effuso, margine columellari dihtato, basali dentibus 

 duobus intus munilo. 



The hare Helix. Shell narrowly umbilicated, rather de- 

 pressed, brown-homy, oblicpiely striated ; spire con- 

 vex ; whorls five, convex, the last obtusely keeled ; 

 aperture oblicpic, narrow, with a laminar tongue- 

 shaped tooth entering upon the wall of the aperture ; 

 lip erect, effused, colnmellar margin dilated, basal 

 furnished inwardl} mtli two teeth. 



Gould, Pro. Nat. Hist. Soc. Boston, 184S, p. 39. 



Hab. Tennessee, North America. 



It has been much doubted whether this and the pre- 

 ceding species arc not varieties of the same ; still the 

 smaller shell has the larger umbilicus. 



Species 723. (Mus. Cuming.) 



Helix suppressa. Hel. testd infundiburjomi-umbili- 

 catd, depresso-orbiculari, virescente-olicaced, titred, 

 subtiUler pUcato-slriatd ; anfractibus septem ad oclo, 

 angustis, plano-contexis, ultimo basi subconcato ; aper- 

 turd lunari, l/imind lenui internd munild ; peristomaie 

 simplici, acuta. 



The coNtKALED Helix. Shell with a fimnel-shapcd 

 \unbilicus, drprcssly orbicular, greenish-olive, glassy, 

 finely plicatcly-striatcd ; whorls seven to eight, nar- 

 row, flatly convex, tlic last somewhat concave at the 

 base ; aperture lunar, furnished with a thin internal 

 lamina ; lip simple, acute. 



Say, Descriptiou of new terrestrial shells, p. 14 ; Binncy, 

 Joum. Nat. Hist. Soc. Boston, vol. iii. p. 410. 

 pi. 11. f. 3. 



Hab. Tennessee, North America. 



Dr. Pfeifler quotes this species as a variety of H. gularis, 

 but it is composed of more whorls, has a narrow deep fun- 

 nel-shaped umbilicus, and the lamina of the npcrturv is 

 more internal. 



