HELIX. 



Plate XLVIII. 



Species 223. (Mus. Cuming.) 



Helix cara. Hel. testa imperforala, depresm, lentieu- 

 lari, acidmime carinatd, lavigald aid minudssime 

 yranulald, fusco-oUvaced ; spird obtum ; aiifraclibus 

 quinqtie, plank; aperturd sMriangulari, marghiiim 

 callo teniii junclU ; perktomaie iiwrassato, depresso-re- 

 Jkxo, viargine basali Intus quadridentaio, denl'ibus an- 

 guslh, erectis, duobus anlicis approxmatis, iasi cal- 

 losk et elevatk. 



The PRECions Helix. Shell imperforated, depressed, 

 lens-shaped, very sharply keeled, smooth or very 

 minutely gi'anulated, brown-olive; spire obtuse; 

 whorls five, flat ; aperture subtriangular, margins 

 joined by a thin callous layer ; lip thickened, depressly 

 reflected, basal margin foui'-toothed within, teeth 

 nan'ovv, erect, the two front teeth contiguous, callous 

 and raised at their base. 



Ada.ms, Contributions to Conchology, No. 2. p. 29. 



Ha/j. Jamaica. 



An extremely interesting species, allied to the following, 

 but readily distinguished on comparison. It is uniformly 

 of smaller size, not so mucli flattened out at the periphery, 

 and covered by a more horny kind of epidermis. 



Species 224. (Mus. Cuming.) 



Helix peracutissima. Hel. testd obtecte umbilicatd, 

 depressissimo-pland, lenliculari, tenuiculd, fused, exile 

 granulald; spird obtusd; anfractibus quinque, pla?tis, 

 ultimo in carinam lamelUformem acutissimam ad peri- 

 p/ieriam expanso ; aperturd perdepresm-triangulari ; 

 periitomate re/lexo, margine basali iidus qvadrideidato, 

 dentibui angustis, creeds, duobus anlicis basi elevatis. 



TuE VERY SHARP IIelix. Shell with a nearly covered 

 imibilieus, very depressly flattened, lens-shaped, 

 rather tliin, brown, finely granuled ; spire obtuse ; 

 whorls five, flat, expanded at tlie periphery into a 

 very sharp lamelliform kocl ; aperture very depressly 

 triangular ; lip rellccted, basal edge four-toothed 

 within, teeth narrow, erect, the two front ones 

 raised at the base. 



Adams, Pro. Boston Nat. Hist. Soc. 1845, p. 15. 



Ilab. Jamaica. I 



Remarkably characterized by its depressed growtii, the I 



October, 



last whorl being pinched and flattened round the periphery 

 into a thin plate. 



Species 225. (Mus. Cuming.) 



Helix Okeniana. Ilel. teUa imperforald, orbicular!, 

 utrinque contexd, obtuse carinatd, uiidique regulnriter 

 granulald, superne fu-icd, basi pallida; anfraitibui 

 quinque ad sex, rotundalo-plauatis, ultimo antice dejtexo, 

 basi profundi bi-scrobiculato ; aperturd subhurizon- 

 tali, elliplicd, coarctatd; peristomate carneo-fiuco, in- 

 crassato, marginiius callo junctls, supero expanno, 

 basali reftexo, tridentato, deutibus aquidistantibus, an- 

 tico superne sulcata. 



Oken's Helix. Shell imperforated, orbicular, convex on 

 both sides, obtusely keeled, regularly granuled 

 throughout, brown on the upper surface, pale on the 

 lower ; whorls five to six, rotundately flattened, last 

 whorl deflected in front, deeply two-furrowed at the 

 base; aperture nearly horizontal, elliptical, contracted ; 

 lip flesh-brown, tliickened, margins joined by a cal- 

 losity, upper margin expanded, basrd reflected, three- 

 toothed, teeth equidistant, front tooth grooved at the 

 upper piirt. 



I'FEIFFER, Pro. Zool. Soc. 1845, p. 63. 



Hub. Jamaica. 



Distinguished by a somewhat depressly globose form, 

 with a light brown band beneath the periphery. 



Species 226. (Mus. Cuming.) 



Helix Linn.ea.na. Ilel. umbilicald, depres'' 

 vexd, infra rolundatd, acute carinatd, p. 

 supra rugoso-malleatd, infra minute et obliqui mguloid , 

 anfractibus quinque ad -wx, lente accretcen^ ' 

 talis, ultimo basi .lubinjlato, antice nx ,. 

 umbilico inajusculo, cylindrico ; aperturd atiguialo- 

 lunari, ad carinam canal iculatd ; peristomate inrrat- 

 sato, cameo, marginibus callo junctis, supero bred, rx- 

 panso, basali arcuato, rejtexo, columettari breriirr de- 

 scenilente, subdilatato. 



The Linn.ean Helix. Shell umbilicatcd, dcpns-nl. 

 convex above, rounded beneath, sharply V 

 pale fulvous, rugoscly indented above, minut. . 

 liquely wrinkled beneath ; whorls five to six, enlarging 

 slowly, flattened, the last rather inflated at the base. 



1831. 



