H E L I X. 



Plate CIV. 



Species 57-i. (Mus. Cuming.) 



Helix bifasciat.\. IM. tedd imperforata, acute conicd, 

 Trochiformi, tenui, iubdiapkand, aUiidd vel rosed, ni- 

 ffricante-rufo varie cingulatd ; anfraclibm septem, m- 

 perne convexis deinde concavU, ultimo acuti carinato, 

 aniice non descendente, basi vix convexo ; aperturd 

 perobliqud, triangulari ; perktomate simplici, alio vel 

 roseo, margine stipero expaiMO, basali rejiexo. 



The two-b.\nded Helix. Shell imperforated, shaq)ly 

 conical, Trochus- shaped, thin, rather diaphanous, 

 whitish or rose, variously banded with blackish-rcd ; 

 whorls seven, convex at the upper part, then concave, 

 the last sharply keeled, not descending ia front, a 

 little convex at the base ; aperture very oblique, tri- 

 angular ; lip simple, white or rose, upper margin 

 expanded, basal reflected. 



Trochus bifasciatus. Burrows, Elements of Conchology, 

 pi. 27. f. 2. 



Carocolla bifasciata. Gray. 

 Ilelix pyramkhlla, Wagner. 

 Helix Bosciana, Ferussac. 

 Helix Blanchetiana, Moricand. 

 Helicina pi/ramidella, Spix. 



Hob. BrazU, Bahia. 



iUthough described as variously banded, the bands are 

 mostly two in number, the lower one, as in the specimen 

 here fiarured, being the broader. 



Species 575. (Fig. a, b, Mus. Cuming.) 



Helix H.a.ktwegi. Hel. testd umbilicatd, depressd, cari- 

 natd, solidd, slriatuld, fused; spird vix elevatd ; an- 

 fractibus quinque, pla>iulalis, ullinio basi paulo con- 

 vexiore, aniice non descendente; uniiilico angusto, 

 pernio ; aperturd perobliqud, irrei/ulnriter snbqua- 

 dratd; perislomate albo, incrassato, breviier re/lexo, 

 marginibus callo junctis, dextro sinuoso, basali subrecto, 

 dilalato, introrsum calloso, dente unico inlerposito. 



II.\utweg's Helix. Shell umbilicatcd, depressed, keeled, 

 solid, finely striated, brown ; spire but little raised ; 

 whorls five, rather flat, the last a little more convex 

 at the base, not descending in front ; umbilicus nar- 

 row, open; aperture very oblique, irrcgidarly snl)- 

 quadrate ; lip white, thickened, shortly reflected, 

 margins joined by a callosity, right margin sinuous. 



basal nearly straight, dilated, callous inwardly. «ith 



a single tooth interposed. 

 Pfeiffeu, Pro. Zool. Soc. 1S45, p. 126. 

 Uab. El Catamaija, near Loxa, Ecuador ; Hartweg. 



A solid brown depressed shell, with a somewhat ctm- 

 tracted aperture and callous lip. 



Species 576. (.Mus. Cuming.) 



Helix GciLLAnMADl. Hel. testa imperforata, lenticHltm- 

 depressd, aoUdiunculd, acuti carinald, l<evigald eel •fub- 

 tilimriii striata, superni straiiiiiied, apertiirnm rz-z-vf" 

 roseo-aurantio tinctd; tuturd opaco-albd, fascia anyinla 

 fiuco-nigrd juxta carinam cingulatd, tublus alin, fnxid 

 latiore fusco-nigrd cingulatd ; spird obttud ; iiMfrnr. 

 tiius quafuor, plano-eonvexis ; aperturd siil>rlij;ii,- 

 ovatd ; peristomate calloso, re/lexo, alio. 



Guillarmad's Helix. Shell imperforatwl, lentiriii;iriy 

 depressed, rather solid, sharply keeled, smooth ur 

 very finely striated, straw-colour at the upper part, 

 tinged with rose-orange towards the aperture; su- 

 ture opake-white, encircled with a narrow hrowii- 

 black band next the keel, wliite beneath, encirrlf<i 

 with a broader black-brown band ; spire obtust- ; 

 whorls four, flatly convex; aperture somewhat tri- 

 angidarly ovate ; lip callous, reflected, white. 



SncTTLEWORTii, MSS., Mus. Cuming. 



Hab. Vera Cruz. 



A very characteristic species, in which the bands, at first 

 obsolete and scarcely marked, become gnidually broader 

 and darker towards the aperture, when a second band i« 

 faintlv marked next the suture. 



Species 577. (Fig. a, b, Mus. Cuming.) 



Helix thigkammepiioka. Hel. testa umbUieald, orbica- 

 lato-cottvexiusculd, slriatuld, nitidd, flato-aliidn, ItHti* 

 caslaneis ornatd ; spird brevi, Mu*d ; anfrartiliu* 

 quinqne, couvexiusculis, ultimo autici desrriidnilr , 

 aperturd roluudato-lunari ; pcrisloiuale sub'impliri, 

 alio, marginibus cjuniceutibus, supero txpaiuo, bauitt 

 reflexo, columellari dilalato, umbilicum vudiocrrm won 

 occultante. 



The thhee-lixe Helix. Shell umbilioitcd, orl>icularly 

 rather convex, finely striated, shining, yrllowi«h- 



June, 1S52. 



