HELIX. 



Plate XLVIl. 



Species 218. (Mus. Adams.) 



Helix patina. Mel. lestd imperforatd, lavigaid tel ob- 

 soleti granulald, acute earmold; spird fornicatd, apice 

 obtusd, olinaceo-rufd, subtus vlreicente ; anfraclibm 

 qubiqiie, planiusculis, ullimo supra concato, infra 

 plano-contexo ; aperlurd subltorizo)itali, purpureo- 

 camed, marginibu^ callo junctU, columellari valde cal- 

 loso, siipero aimplici, basali rejlexo, unidentato. 



The pan Helix. Shell imperforated, smooth or ob- 

 soletely granulated, sharply keeled ; spire arched, 

 obtuse at the apes, olive-red, greenish beneath ; 

 whorls five, rather flattened, last whorl concave 

 above, flatly convex beneath ; aperture nearly hori- 

 zontal, purple-flesh colour, margins joined by a cal- 

 lous layer, columeUar margin very callous, upper 

 margin simple, basal margin reflected, one-toothed. 



Adams, Contributions to Conchology, No. 2. p. 29. 



Hah. Jamaica. 



This is an authentic representation of Professor Adams's 

 H.pal'ma, and it may prove to be a variety of H. ingens, 

 and not, as the author suggests, a variety of H. acuta. 



Species 219. (Mus. Cuming.) 



Helix acuta. Hel.teddobleete mnbilicald, dkcoided, utrin- 

 que concexd, solidd,fulvd, minulim graimload ; anfrac- 

 tibiia quinque ad sex, planiuscuUs, ullinto convexo, ca- 

 rinato ; aperlurd fere ItorizonlaU, late liinari ; peruto- 

 mate simpUci, marginibus callc junclis, supero parum. 

 expanso, basali subreclo, late rejlexo, bidentato. 



The sharp Helix. Shell with a partially covered um- 

 bilicus, discoid, convex on both sides, solid, fulvous, 

 minutely granulated ; whorls five to six, rather flat- 

 tened, the last convex, keeled ; aperture nearly hori- 

 zontal, broadly lunar ; lip simple, margins joined by 

 a thin callous layer, upper margin but little ex- 

 panded, basal margin nearly straight, broadly re- 

 fleeted, two-toothed. 



Lamarck, Encyclopedic Methodique, pi. 462. f. 1. 

 Helix Laniarcliii, Ferussac. 

 Carocolla Lumarckii, ViUa. 

 Eadem var. Helix acutisaima, Deshayes. 

 Carocolla aculivsima, Lamarck. 

 Helix heleroclitea, Lamarck. 



Hab. Jamaica. 



This is usually regarded to be the original H. acuta, al- 

 though any one of the species figured in the accompanying 

 plate may have been referred to that type at the time it 

 was founded. 



Species 220. (Mus. Adams.) 



Helix Chemnitziana. Hel. teatd imperforatd, deprttta, 

 supeme radiatim plicato-malleatd, undique graniilota, 

 sub epidermide olivaced rufd, acute carinatd ; tpird 

 subelevafd, obtusd ; an/raclibus quinque, planit, ultimo 

 basi convexo ; aperlurd suhtriangulari, intus nitida, 

 earned; peristomate cameo, margine tupero snbex- 

 panso, basali rejlexo, dmte valido mimilo, cotumetiari 

 atricto, dilalato, appreaso, iiiaqualiter pluridentato. 



Chemnitz's Helix. Shell imperforated, depressed, ra- 

 diately plicately indented round the upper part, gra- 

 nuled throughout, red beneath an olive epidermis, 

 sharply keeled; spire scarcely elevated, obtuse; 

 whorls five, flat, last whorl convex at the base; 

 aperture nearly triangular, sliining within, flesh- 

 colour; lip flesh-colour, upper margin rather ex- 

 panded, basal reflected and furnished with one strong 

 tooth, columellar margin drafvu out, dilati-d, ap- 

 pressed, unequally many-toothed. 



Pfeiffeb, Pro. Zool. Soc. 1S45, p. 43. 

 Helix Jluctuata, Adams. 



Hab. Jamaica. 



This species is chiefly characterized by a number of 

 obliquely plicated indentations, ranging spirally on the 

 upper surface next the periphery. 



Species 221. (Fig. a, b, Mus. Cuming.) 



Helix ingens. Hel. testa plerumque umbilicatd, ducoi- 

 ded, acute carinatd, juxta carinam coHcacd, pltu Mutiu 

 granuload, rufd tel fulvo-olitactd ; spird parum eU- 

 vald, obtusd; anfractibus quinque, nil 



aperlurd sublriangulari, earned aut fuu.. -j, 



marginibus callo junclis, snpero plano^xpanto, bataU 

 reJli-To, deutibus duoius, intrrdum y: 



The large Helix. Shell gemrally un. iisooid, 



sharjily kwlwl, concave next the ke«l, more or l«s 

 simulated, red or fulvous-olive; spire bu'. ' ' ■!. 



obtuse ; whorls five, couvex beueath ; aj'- ■> 



October, 1851. 



