IIELIX.— Plate CXVI. 



cular ; lip depressed at the upper part, simple, thick- 

 ened and shortly reflected at the base, mar^nns ap- 

 proximated. 

 Lea, Observations, vol. ii. p. S7. pi. 23. f. 72. 

 Uab. North America. 



A fine dark olive species of Cychiloma-V\Vc growth, in- 

 habiting the banks of the Columbia Eiver, &c. 



Species 670. (Mus. Cuming.) 

 Helix alternata. Eel. UUd late umbilkatd, orbicu- 

 lato-depream, tenui, luteo-cortwu, alrigk interruptU 

 rufis oriiaid, itrik conferlU elevatis scabrd; anfrac- 

 lihui quinque ad sex, planimculis, uUimo interdum 

 o/jliise carinalo; umhilko magm, pernio; aperlurd 

 perobliqua, lunato-ovali ; peristomal simplici, acuta, 

 ad umbiUcum vix expamo. 

 The altekxate Helix. Shell broadly umbilicated, or- 

 bicularly depressed, tliin, yellowish-horny, ornamented 

 with red interrupted streaks, rough with close-set 

 raised stria; ; whorls five to six, rather flat, the last 

 sometimes obtusely keeled ; umbilicus large, open ; 

 aperture very oblique, lunar-oval ; lip simple, acute, 

 a little expanded at the umbilicus. 

 Say, Journ. Acad. Nat. Sci. Philadelphia, vol. ii. p. 161. 

 Helix scabra, Lamarck. 

 Ilelix radiala, Gmclin. 

 Hab. North America, on the banks of the rivers and in 

 damp parts of the forests, upon decaying logs and 

 stumps. 

 Characterized by its conspicuous red-streaked and mot- 

 tled painting, and deep open perspective umbilicus. 



Species 671. (Mus. Cuming.) 



Ueltx PA.NDOEyH. Ilel. testd obtecte umbilicald, depresso- 



globosd, tenui, riigulosd, coiiceidrice minutissime striatd; 



anfractibus supra peripheriam fuscis, infra et prope 



peripheriam albidvs, fu9Co cingulalis, basi albidis ; 



aperlurd rolundatd, inlus fused, aliido-fasciatd, mar- 



gine interna incrassato, alio ; peristomate rejlexiusculo, 



extus aUto-labiato, margine columellari dilalato, rejlexo, 



umbilicum occultuHte. 



1'an Dora's Helix. Shell with a covered umbilicus, de- 



pressly globose, thin, wrinkled, concentrically very 



minutely striated ; whorls above the periphery brown, 



beneath and near the periphery whitish, encircled 



with brown, at the base whitish; apertwe rounded, 



brown and white-banded within, inner edge thickened, 

 white ; lip slightly reflected, white-edged outwardly, 

 columellar margin dilated, reflected, concealing the 

 umbilicus. 



Forbes, Pro. Zool. Soc. 1850, p. 55. 



Uab. Central America, near the Straits of Juan del Fuaco. 



A small grey-browii species with somewhat of a Euro- 

 pean aspect. 



Species 672. (Mus. Cuming.) 



Helix laevigata. Ilel. testd umbilicald, depressd, tenui, 

 virescente-corned, supeme minuti costulalo-striatd, basi 

 convexiuscula, sublavigatd ; spird vix elevatd ; anfrac- 

 tibus quinque, planiitsculis, ultimo lata, antici non de- 

 scendente ; aperlurd ampld, late lunari, inlus ctBtules- 

 cente ; peristomate acuta, recto, marffinibus connicun- 

 tibtts, columellari viz dilalato, re/lexinsculo. 



The smooth Helix. Shell umbilicated, depresse<l, 

 thin, greenish-homy, minutely rib-like striated, rather 

 convex at the base, nearly smooth ; spire but little 

 raised ; whorls five, rather flat, the last broad, not 

 descending in front; aperture large, broadly lunar, 

 bluish within; lip sharp, straight, margins approxi- 

 mating, columellar a little dilated and reflected. 



Mesoviphix Uevigata, Rafinesque, Beck, Index, p. 7. 



Hab. Pennsylvania, Kentucky. 



Thin, transparent, smooth, and homy, of a greenish 

 hue, with only a moderate-sized umbilicus. 



Species 673. (Mus. Cuming.) 



Helix vellicata. Ilel. testd ajierti umbilicald, tenui, 

 canvexo-depressd, luteo-virescente, subnitidd, sulcalo- 

 driatd, strii» minutissimis spiralibus decussald ; spird 

 convexiuiculd ; anfractibus sex, ultimo rotundato, magna, 

 antice dilalato, subdescendenle ; aperlurd perobliqua, 

 lunalo-oblongd,fauce albd ; perulomate effuso, margine 

 subreflexo, superne dejlexo-sinuato. 



The i'inched Helix. Shell openly umbilicated, thin, 

 convexly depressed, greenish-yellow, rather shining, 

 "roove-striated, decussated with ven,- minute spiral 

 striaj; spin; rather convex; whorls six, the last 

 rounded, large, dibted and a little descending in 

 front; aperture very oblique, lunar-oblong, interior 

 white ; lip effused, edge a little n-flectcd, deflectedly 

 sinuated at the upper part. 



FoHDEs, Pro. Zool. Soc. ISoO. p. J."). 



Ilab. Panama? 



