HELIX. 



Plate CVn. 



Species 595. (Mus. Cuming.) 



Helix co.\ctiliata. Hel. iesid late umbiUcatd, depressa, 

 subdiscoided, tenui, sub Unte minutmimi granulato-stri- 

 atd, luiud nitmte, pallide corned, fasciis aiigmtis riifts 

 ornatd ; spird vix elevatd; anfraclilius qualuor, con- 

 vexin, ultimo antice aubdeflexo, basi vix latiore ; aper- 

 turd perobliqud, mtbcirculari ; peristomate simplici, 

 marginibus fere caniiguis, aupero recto, basalt breviter 

 rejlexo. 



The felted Helix. Shell broadly umbUicated, de- 

 pressed, somewhat discoid, thin, very minutely gra- 

 nularly striated beneath the lens, not shining, pale 

 horny, ornamented with three to four narrow red 

 bands ; spire bat little raised ; whorls four, convex, 

 the last a little deflected in front, scarcely broader 

 at the base ; aperture very oblique, nearly circular ; 

 lip simple, margins nearly contiguous, upper margin 

 straight, basal shortly reflected. 



Ferussac, Hist. Moll. (Deshayes' edit.) p. 18. pi. 72. 

 f. 1-5. 

 Helix Nystiana, Pfeiffer. 



Hab. Central America. 



A nearly discoid light homy shell, encircled with three 

 distant red lines. 



A shining homy species, sometimes pale yellow, some- 

 times prettily painted with dark bands. 



Species 596. (Fig. a, b, Mus. Cuming.) 



Helix orxatella. Hel. testd imperforaid, orbiculato- 

 convexiusculd, leciler striaiuld, Hitidissimd,fulvescente- 

 luled, uiiicolore vel fasciis saturate fulvis et castanets 

 muUimode ornatd et radiald ; spird convexiusculd, ob- 

 tusd; anfractibus tribus ad (juatuor, vix convexiusculis, 

 ultimo basi planiore ; aperturd rolundatu-lunari ; pe- 

 ristomate simplici, acuta, ntargine columellari sitbobli- 

 fjuo, dilatato, alba. 



The ornamented Helix. Shell imperforated, orbicu- 

 larly rather convex, finely striated, verj' shining, ful- 

 vous-ytUow, of one colour, or variously ornamented 

 and rayed with dark fulvous or ciiestnut bands ; spire 

 rather convex, obtuse ; whorls three to four, slightly 

 convex, the last flatter at the base ; aperture rotun- 

 datcly lunar ; lip simple, sharp, columellar margin 

 rather oblique, dilated, white. 



Pfeiffer, Symboln;, vol. ii. p. 36. 



Hab. Pitcaira's Island, and island of Opara ; Cuming. 



June, 



Species 597. (Mus. Cuming.) 



Helix iieliomoidea. Hel. testa laiittime umbilicatd, 

 depressi.mmd, discoided, larigatd, luleo-eomed ; spird 

 planimmd, medio sMmpressd ; anfractibut nortm, 

 convexiusculis, utrinque eequalibus ; aperturd oblique 

 semiovali, sinuosd ; peristomate breviter reflexo, mar- 

 ginibus callo valido dentiformi triquetro junetis, »u- 

 pero medio impresso, intus unidentato. 



The helicoid Helix. Shell very broadly umbilicatcd, 

 very depressed, discoid, smooth, yellowish-horny ; 

 spire verj- flat, slightly impa-sscd in the middle ; 

 whorls nine, rather convex, equal on both sides ; 

 aperture oblique, semioval, sinuous ; lip shortly 

 reflected, margins joined by a strong triangularly- 

 shaped tooth-like callosity, upper margin impressed 

 in the middle, toothed within. 



D'Obbigny, Voyage dans I'Amt'r. Mend. p. 237. pi. 23. 

 f. 1-4. 



Hab. Guayaquil. 



A flattened closely convoluted shell, completely discoid, 



after the manner of a Ptanorbis. 



Species 598. (Fig. a, b, Mus. Cuming.) 

 Helix Thais. Hel. lestd imperforatd, depreMO-fcmcd, 

 acute carinatd, tenui, corned, saturate fused, lupemi 

 striis concent rick et obliquit suitililer decussatd, in- 

 ferne Irrrigatd, nitente ; anfracliiiu sex. planatu ; 

 aperturd trigono-tunari ; labro simplici, ad eolumellam 

 subexcavato. 

 The Thais Helix. Shell imperfomte»l, d.pressly cui- 

 cal, sharjily keeled, thin, lioniy, dark brown, finely 

 decussated about the upper part with obli(iuc ami 

 concentric slriie, smooth and shining at the lower; 

 whoris six, flattened ; niK-rtun- triangidarly lunar ; 

 lip simple, slightly excavated about the columclLi. 

 jACariNoT, Zeitschrift Hir Malac. 1819. p. OS. 

 Hab. Manpiesas Islands. 



A thin diu-k bn)wn homy shell of simple character, de- 

 cussately striated above, smooth and shining beneath. 



1S52 



