HELIX.— Plate CXXII. 



striata, bail lavu/atd ; »pird vix elevatd, obtutd ; an- 

 fraciibui sex, angustis, subplanulatU, ultimo superne 

 sttbatigulato, intus seriebus pluribus remotis dentium 

 niunito, denltbus in serie basi pellucente ; umbilico 

 angmtissimo, pervio ; aperturd depressd, lunari ; peri- 

 slomate simplici, acuta. 



The many-toothed Helix. Shell umbilicatcd, orbi- 

 cular, depressed, shining, horny, regularly striated at 

 the upper part, smooth at the base ; spire scarcely 

 raised, obtuse ; whorls six, narrow, rather flattened, 

 the last slightly angled at the upper part, furnished 

 within ^vith several distant rows of teeth, five in a 

 row on the transparent base ; umbilicus very narrow, 

 open ; aperture depressed, lunar ; lip simple, sharp. 



Gould, Journ. Nat. Hist. Soc. Boston, U. S. vol. iii. 

 p. 425. pi. 22. f. 5. 



H(d). Vermont, North America. 



The rows of teeth which characterize this species are in- 

 ternal, and not seen at the aperture. 



Species 730. (Mus. Cuming.) 



Helix indentata. Hel. tesld vix umbilicald, depressd, 

 pellitcidd, palUde corned, rntidissimd, line-is radiantihm 

 impressis regulariter distantibiis notatd ; spird plani- 

 iisculd ; anfractihus quatnor ad quinque, celeriter ac- 

 crescentihus, ultimo circa tanhilicam punctiforme exca- 

 vato ; aperturd depressd, anipld, lunari ; peristomate 

 mnplici, acuta, margine supero anlrarsum arcuate. 



The indented Helix. Shell scarcely umbilicated, de- 

 pressed, transparent, pale horny, viry shining, marked 

 with regularly distant impressed radiating lines ; spire 

 rather flat ; whorls four to five, increasing rapidly, the 

 last excavated around the puncture-like umbilicus; 

 aperture depressed, large, lunar; lip simple, sharp, 

 upper margin curved forward. 



Say, Journ. Acad. Nat. Sci. Philadelphia, vol. ii. p. 372. 



llab. New Jersey, Massachusetts, Philadelphia, North 

 America. 



A bright glassy shell, indented throughout with radi- 

 ating ridges. 



Species 731. (Mus. Cuming.) 



Helix minuscula. Ilel. testd umMUcatd, depressd, tenui, 

 pellucidd, hyalind, nilidd, sub lente ruguloso-striatd ; 

 spird vix elevatd; anfractibm qualuor, planiusculis, 

 ultimo iereti, vix latiore ; umbilico lato, pervio ; aper- 

 turd subcirculari ; peristouiaie simplici, acuto. 



The little Helix. Shell umbilicatcd, depressed, thin, 



transparent, hyaline, shining, finely striated in a 

 wrinkled manner beneath the lens ; spire but little 

 raised ; whorls four, rather flat, last whorl tapering, 

 scarcely broader tlian the rest ; umbilicus broad, 

 open ; aperture nearly circular ; lip simple, sharp. 



Binney, Journ. Nat. Hist. Soc. Boston, U. S. vol. iii. 

 p. 435. pi. 22. f. 4. 



Hab. Vermont, Ohio, North America. 



The smallest of the North American species. 



Species 732. (Mus. Cuming.) 



Helix FCLVA. Ilel. testd vix umbilicald, turbinato-globosd, 

 corned, minutissime striatuld, nitidd; anfracti/nu sex, 

 convexis, angustissimis, ultimo basi convexiusculo ; aper- 

 turd depressd, lunari ; peristomate redo, simplici, acuto. 



The fulvous Helix. Shell scarcely umbilicated, turbi- 

 nately globose, horny, v(?ry minutely striated, sliining ; 

 whorls six, convex, very narrow, the last rather con- 

 vex at the base ; aperture depressed, lunar ; lip 

 straight, simple, sharp. 



Miller, Verm. terr. et fluv. Hist. vol. ii. p. 56. 

 Helix trochiformis, Montagu. 

 Helix trochulus, Dill\vyn. 

 Helix chersina. Say. 

 Helix Mandralisci, Bivon. 

 Helix Morton i, Jeffreys. 



Hab. Europe, North America. 



A smooth transparent globular shell. 



Species 733. (Mus. Cuming.) 



Hklix arborea. Hel. testd umbilicatd, depressd, nitt- 

 duld, striatuld, virente vel fulvescente corned; spird 

 cotwexd, parum elatd ; anfractibus quatuor ad quinque, 

 convexiusculis, ultimo vix depresso ; umbilico angusto, 

 pervio; aperturd lunato-circulari ; peristomate sim- 

 plici, acuto. 



The arboreal Helix. Shell umbilicatcd, depressed, 

 shining, finely striated, greenish or fulvous honiy ; 

 spire convex, but little raised ; whorls four to five, 

 rather convex, the last slightly depressed ; umbilicus 

 narrow, open; aperture lunar-circular; lip simple, 

 sharp. 



Say, American Encyclopredia, pi. 4. f. 4. 

 Helix Ottonis, PlVitlVr. 



Hab. Ohio, Massachusetts, North America. 



A bright olive gkssy shell, extremely thin and triins- 

 parent. 



