HELIX.— Plate CI. 



bus qulnque, planatta, tiiiliis rotundatls, tillimo anlke 

 coMpicui deflifxo el constrklo, siMiis acrobiculalo ; 

 aperliird horizontaU, traiiscerse ovali, marginibua inte- 

 i/ris, lamella pariete forinalu, mari/ine columellari ni- 

 tidi quadndeiilalo. 

 Dlnker's Helix. Shell rather largely urabilicated, or- 

 bicular, very <lepressed, granulated, veiy sharply 

 keeled, yellowish-horny, banded next the periphery 

 with blackish-chestnut, ke(^l very finely edged with 

 white ; whorls five, flattened, rounded beneath, the 

 last conspicuously deflected and constricted in front, 

 furrowed beneath; aperture horizontal, transversely 

 oval, margins entire, a lamella formed on the wall 

 of the body-whorl, columcllar margin neatly four- 

 toothed. 

 Pfeiffek, Pro. Zool. Soc. 1851. 

 Hab. Andes of New Granada. 



A pretty bright horny species encircled with a dark 

 band next the periphery, the sharp edge of which is con- 

 spicuously white. 



Species 560. (Mus. Cuming.) 



Helix Lepuieukii. JUL testa jtmbilicald, orbiculatd, 

 conoideo-depressd,fali)d, subcarinald; carina albicaiite; 

 aiifractibus quinque, vix convexiusculis, ultimo antice 

 subito de/lexo, bnsi scrobiculato ; nmbilico nwdiocri ; 

 aperlurd aiiz/uslissimd, kori:ontali, subauriformi ; pe- 

 ristomate subincrassato, albo, nwrginibus lamella erectd, 

 umhilicum semioccullante, aliamque atiguhtim longe in- 

 tranteni emitlente junclts, supero expanso, basalt sinvoso, 

 rejtexo, tubercido dentifurmi et juxla carinam dvnte 

 valido geminato inslructo. 



Leprieure's Helix. Shell umbilicated, orbicular, eo- 

 uoidly depressed, fulvous, obtusely keeled, white at 

 the keel ; whorls five, slightly convex, the last sud- 

 denly deflected in front, furrowed at the base ; um- 

 bilicus middling ; a])erture very narrow, horizontal, 

 somewhat ear-shaped; lip rather thickened, white, 

 margins joined by an erect lanHli:i, half-covering the 

 uniljilieus, emitting another angulately and promi- 

 nently entering the aperture, upper margin expanded, 

 basal sinuous and reflected, furnished with a tooth- 

 shaped tubercle, and next the keel a strong double 

 tooth. 



Petit, Ilevue Zoologique Soc. Cuv. 1840, p. 74. Guerin's 

 Mag. de Zool. ISU, Moll. pi. 32. 



Hab. Guyana. 



The flexuous lip and teeth of this species are remarkably 

 strongly developed. 



Species 561. (Mus. Cuming.) 



Helix .nigritella. Hel. testa umbilicald, conoideo-de- 



pressd, solidinsciild, fused, epidermide nigrieante-oli- 

 vaced indutd ; aiifractibus quinque ad sex, rix convexi- 

 usculis, lente accrescenlibwi, ultimo basi contexo, medio 

 acute carinato ; umbilico tnediocri, pernio; nperturd 

 securiformi ; perMtomate siinplici, margine supero aii- 

 trorsum arcualo, aculo, basaii refiexo. 



Tue swabtiiy Helix. Shell umbilicated, conoidly de- 

 pressed, rather solid, brown, covered with a blackish- 

 olive epidermis ; whorls five to six, slightly convex, 

 increasing slowly, the last convex at the base, sharply 

 keeled in the middle ; undjilicus middling, open ; 

 aperture hatchet-shaped ; lip simj)le, upper margin 

 curved towards the front, sharp, basal margin re- 

 flected. 



PiiiLiPi'i, .\l)l)ild. und Besch. Conch, vol.ii. p. 4. pi. 6. f. S. 



llab. Pacific Islands ; Cuming. 



A dark little Trochiforra shell, tinged with red at the 

 apex, and having a simple toothless aperture. 



Species 562. (Mus. Cuming.) 



Helix auriculina. Hel. testa umbilicatd, orbiculatd, 

 carinatd, utrinque convexd, granulaio-striatd,fulcd, ad 

 carinam lutescente ; aiifractibus quinque, planulatis, 

 ultimo subito de/lexo, basi scrobiculato ; aperturd Iwri- 

 zontali, auriformi, plicis coarctatd, und lamelliformi, 

 ad parietem profundi intrante, secundd dentiformi, et 

 tertid furcatd in margine basalt; peristomate albo, 

 reflexo, marginibus ad umbiliaim mediocrem pervium 

 junctis. 



TnE LITTLE EAR Helix. Shell mubilicatcd, orbicular, 

 keeled, convex on both sides, granidarly striated, 

 fulvous, yellowish at the keel ; whorls five, rather 

 flattened, the last suddenly deflected, furrowed at 

 the base; aperture horizontal, ear-shajied, nmtractetl 

 with three plaits, one of which is lamelliforra, deeply 

 entering upon the wall of the body-whorl, the second 

 tooth-shaped, and the third bifurcate upon the basal 

 margin; lip white, reflected, margins joined at the 

 iimbilicus, which is middling and open. 



Petit, Ilcviu- Zoologique Soc. Cuv. 1840, p. 74. Guerin's 

 Mag. de Zool. 1841. pi. 33. 



Ilab. Guyana. 



The development of tlie aperture is ncflrly tlie same us 

 in //. lAprienrii, figured above it ; the shell is smaller, 

 and the whorls are rounder. 



