HELIX 



Plate CI. 



Species 556. (Mus. Cuming.) 



Helix Tamsiana. Ilel. testa umhilicatd, depresse conicd, 

 gramdatd, fused, acute carinatd ; spird conoided, ver- 

 tice obtusimculo ; anfractibus quinque, subplanU, ul- 

 timo basi vix convexiuscuto, a/itice anguliilim dijlexo, 

 ad aperturam constrklo ; aperturd subhorizoniali, au- 

 ri/ormi, quadridentatd ; peristotnate tenui, manjinUjus 

 lamina callosd, umbilici partem iegente et medio dentem 

 linguiformem emittente jioictis, aupero expanso, uni- 

 dentato, basali re/lexo, deatiius fere cequatibus munito. 



Tams' Helix. Shell umbilicated, dcpressly conical, gra- 

 milatcil, brown, shaqily keeled ; spire conoid, rather 

 obtuse at the apex ; whorls five, somewhat flattened, 

 the last rather convex at the base, angularly deflected 

 in front, constricted at the aperture ; aperture nearly 

 horizontal, ear-shaped, four-toothed ; lip thin, mar- 

 gins joined by a callous layer, partly covering the 

 umbilicus, and emitting on the body-whorl a tongue- 

 shajied tooth, upper mari,nn expanded, one-toothed, 

 basal margin reflected, furnished with two nearly 

 equal teeth. 



DuNKEU, Zeitschrift fiir Malac. 1847. p. 81. 



Hab. Venezuela ; Dr. Tams. 



A small conical transparent homy shell, with the teeth 

 of the aperture delicately formed. 



Species 557. (Mus. Cuming.) 



Helix qcadridentata. Uel. testa umhilicatd, orbicu- 

 latd, tenuiusculd, striata, gramdatd, fused ; spird de- 

 presso-conoided ; anfractibus quinque ad sex, vix eon- 

 vexiusculis, ultimo carinato, basi eonvexo, antice subitu 

 deflexo, scrobiculalo ; aperturd auriforini, fused, dente 

 lamelllfonni pariete eoaretatd ; peristomatc simpUci, 

 marginibus callo funiculalo junctis, supero late ex- 

 panso, basali sinuoso, infra carinam dente acuto pro- 

 minenle et prope umbilicum mediocrem duobtts mino- 

 ribus instructo. 



The four-tootued Helix. Shell umbilicated, orbicu- 

 lar, rather thin, striated, granulated, brown ; spire 

 dcpressly conoid ; whorls five to six, rather convex, 

 the last keeled, convex at the base, suddenly de- 

 flected in front, furrowed ; aperture car -shaped, 

 brown, contracted by a lamelliform tooth on the 

 wall of the body-whorl ; lip simple, margins joined 



Mav, 



by a corded callosity, upper margin broadly ex- 

 panded, basal sinuous, furnished with a prominent 

 sharp tooth beneath the keel, and two smaller teeth 

 near the umbilicus. 



Carocolla quadridentata, Broderip, Pro. Zool. Soc. IbSZ. 

 p. 30. 



Uab. Central America (in the woods) ; Cuming. 



Similar in form to the preceding species, but of much 

 more solid structure, with the teeth and lip more strongly 

 developed. 



Species 558. (Mus. Cuming.) 



Helix LEUCODON. Uel. ttitd umbilicata, depretsii, tub- 

 lenticulari, undique subtilitt^ granulate, mlurtiti cat- 

 taned ; spird plane eletatd, vertice obtuio ; nnfractibitt 

 quinque, suhplanulatis, ultimo carinato, an/ice gib/io, 

 ad aperturam suiilo deflexo, conslriclo, suilun tcrohi- 

 culato ; aperturd perobliqud, irregulariler pyrifonni ; 

 peristomate tenui, alio, expanso, rejlexiuiculo, inanjini- 

 bm lamina elevald, Jlexuoid, medio lamellam ereclam 

 linguiformem emittente junctis, supero dente parcHlu. 

 basali dentibus parvutis duobus munito. 



The ■wuite-tootiied Helix. Shell umbilicated, de- 

 pressed, sublenticular, finely granulated throughout, 

 dark chestnut ; spire flatly raised, olituse at the ajwx; 

 whorls five, rather flat, the last keeled, gibbous iu 

 front, suddeidy deflected and constrictetl at the 

 aperture, furrowed beneath ; aperture verj' obliciiic, 

 irregularly pear-shaped ; lip thin, white, expanded, 

 slightly reflected, margins joined by n raised flexiionc 

 lamina, emitting in the middle a raised longtie-»ha|)od 

 lamella, upper margin furnished with one small tooth, 

 basal with two to three small teith. 



Pfeiffeh, Zeitschrift fur Malac. 1847. p. 81. 



Uab. Tovah, Venezuela ; Dyson. 



A dark solid species of robust form, in which the bnsnl 



margin is thickly reflected, while the teeth an- small. 



Species 559. (.Mus. Cuming.) 



Helix Dixkeui. Ilrl. testa SHbamplHer u ' <•• 



biculari, talde depressd, groHulald, aculito '. 



lutescente-comed, nigricaHle-cattaneo juxia peripkeriam 

 fasciatd, carina sublilitsime albo-margiHttta . OHfracli- 



lSo2. 



