HELIX.— Plate CXLII. 



TuE TWO-KEELED IIelix. Shell urabilicatcd, Trochus- 

 shaped, set throughout with sharp granules ; spire 

 raised, step-formed ; whorls five, two-keeled, the last 

 suddenly deflected in front, but little convex at the 

 base; umbilicus puncture-like; aperture horizontal, 

 circular; lip simple, sharp, very shortly expanded 

 throughout, margins continuous, free. 



SowEUBY, Zool. Jouru. vol. i. p. 58. pi. 3. f. 7. 

 Helix dupUcata, Lowe. 



H(il). Island of Porto Santo, Madeiras. 



A roughly granulcd rather solid prominently two- 

 keeled species, of a dark brown colour. 



Species 910. (Mus. Cuming.) 



Helix eciiixulata. Hel. testa umbiUcatd, Trochifonni, 

 granulia echimdatis scaberrimd, fused, basi riifo-bifas- 

 ciatd ; spird elevatd, apice oblnsd ; a)ifractibus sex, 

 convexis, ultimo acute carinato, basi plaiiiusculo, juxta 

 carinam sulcata, antice subitu dejlexo ; mnbilico minimo, 

 punctlformi ; aperturd circulari ; peristomate simpllci, 

 acuta, continuo, soluto, expansinsculo . 



The PKicKLy Helix. Shell umbilicated, Trochus-shaped, 

 roughed with prickly granules, brown, encircled with 

 two red bands at the base ; spire raised, obtuse at 

 the apex ; whorls six, convex, tlic last sharply keeled, 

 rather flat at the base, grooved next the keel, suddenly 

 fleflected in front ; umbilicus very small, puncture- 

 like ; aperture circular ; lip simple, sharp, continuous, 

 free, a little expanded. 



Lowe, Faun. Mader. p. 57. pi. 6. f. 19. 



Hnb. Island of Porto Santo, Madeii-as. 



Allied to the preceding species, but more strongly 

 grained and having but one keel. 



Species 911. (Mus. Cuming.) 



Helix stellahis. Hel. testa subampliter umbiUcatd, de- 

 pressd, tenuiculd, vivid e fuscescente, albido lentiginosd; 

 anfractibus qnatuor, cotivexiusculis ; aperturd trans- 

 verse ovatd; peristomate tenui, subexpanso, margiiiibus 

 fere conti/juis. 



The stellar Helix. Shell rather largely umbilicated, 

 depressed, rather thin, bright brown, freckled with 

 whitish ; whorls four, rather convex ; aperture trans- 

 versely ovate; lip thin, a little expanded, margins 

 almost contiguous. 



Lowe, Ann. and Mag. Nat. Hist. vol. ix. p. 118. 

 Hab. Madeira. 



Resembling H. arcta, but thinner and of a more trans- 

 parent colour. 



Species 912. (Mus. Cuming.) 



Helix auridens. Hel. testa unJ/ilicatd, depressd, cari- 

 natd, tenui, pallide corned, ruf/oso-striatuld, hixpida : 

 spird vix elevatd ; anfractibus quinque, planulalit, ul- 

 timo basi contexiore, antice breviler defiexo ,• aperturd 

 perobligud, depressd, irregulariter lutmri ; peristomate 

 acuto, margine dextro simplici, brevi, arcuato, basali 

 strictiusculo, breviler reflexo, umbilicum semioccultanle. 



The smiling Helix. Shell umbilicated, depressed, 

 keeled, thin, pale homy, finely rugosely striated, hairj' ; 

 spire scarcely raised ; whorls five, rather flattened, 

 the last more convex at the base, shortly deflected in 

 front ; aperture very oblique, depressed, irregularly 

 lunar; lip sharp, right margin simple, short, arched, 

 basal rather drawn out, shortly reflected, half-cover- 

 ing the umbilicus. 



Lowe, Faun. Madcr. p. 43. pi. 5. f. 9. 



Hab. Madeira. 



A more broadly lunar ajierture than in its allied species, 

 the basal margin being dilated half over the umbilicus. 



Species 913. (Mus. Cuming.) 



Helix engonata. Hel. testd latissime perspective umbi- 

 Ucatd, depressd, brunneo-rufescenie, cestui aid ; spird 

 convexd ; anfractibus sex ad septem, convexiusculis, ul- 

 timo ad peripheriam carinato, circa umbilicum conicum 

 acute ungulate ; aperturd non descendente, subquadraid; 

 peristomate recto, simplici, acuto. 



TiiE MANY-ANGLED Helix. Shell very broadly perspec- 

 tively umbilicated, depressed, brownish-red, finely 

 ribbed ; spire convex ; whorls six to seven, rather 

 convex, last wliorl keeled at the periphery, sharply 

 angled arouud the conical umbilicus ; aperture not 

 descending, somewhat square; lip straight, simple, 

 sharp. 



Suuttlewouth, Diag. MoUuskcn, p. 5. pi. 1. No. 1. 

 f. 9, 10. 



Hab. Island of Tencriffc, Canaries. 



Of widely convoluted discoid growth, allied to H. Oue- 



