HELIX. 



Fl.ATE XXXV. 



The shells ligurcd in tiie central column of this Plate 

 at Fig. 153 a, b, and 156 a, h, prove, upon a careful 

 examination and comparison of many specimens, to be 

 identical with //. Mdcatfei, PfciiTer, described and figured 

 by me at Plate XXX. as a new species, in error, ivith the 

 name H. Solarioides. The shell figured in the accompany- 

 ing plate at 153 a, b, is H. alhocincta, Pfeittcr, but all 

 these now appear to be so many different varieties of H. 

 planorbls. Lesson, Voy. de la Coqnille, p. 312. pi. 13. f. 4. 

 I propose, therefore, to regard H. Metcalfei, Solarioides, and 

 albocinda, as synonymes oi H. planorbls, Sp. 127. 



Species 15-i. (Fig. a, b, Mus. Cuming.) 



Helix Boholensis. ITel. testa imperforald, depressS, 

 lenticulari, acute carinatd, tenui, corneo-albidd ; spird 

 conveximculd ; anfractibus septem, plunulatii, regula- 

 riter cotifertim strialis, supra carinam lineis duabus 

 acute elevatis approximatis cinctis, ultimo basi con- 

 vexitisculo, striatulo, medio vix impresso, antice non 

 descetidenie ; aperlurdverticali, depressissimd, antjulato- 

 lunari ; perislomate simpUci, acuto, margine supero 

 brevissimo. 



The Bohol Helix. Shell imperforated, depressed, len- 

 ticular, sharply keeled, thin, horny white ; spire 

 rather convex; whorls seven, flattened, regularly 

 closely striated, encircled above the keel with two 

 sharply elevated approximating lines, last whorl 

 rather convex at the base, finely striated, scarcely 

 impressed in the middle, not descending anteriorly ; 

 aperture vertical, very depressed, angularly lunar ; lip 

 simple, sharp, upper edge veiy short. 



Pfeiffek, Pro. Zool. Soc. 1815, p. 123. 



ITab. Island of Bohol, Philippines ; Cuming. 



There is a great deal of character in the upper surface of 

 this shell, each whorl being closely striated in delicate con- 

 centric folds, and encircled next the keel by two fine 

 linear ridges. 



Species 155. (Fig. a, 4, Mus. Cuming.) 



Helix anceps. Hel. testa subumiilicatd, lenticulari, 

 pallide corned, acute carinatd, supra alriatd, sublus 



nitidd ; anfractibus sex, vix conrexiunculis, ultimo inn 

 contexiore, laviyalo, infra carinam comprewj bretilcr 

 prnminente lineis nonnultis imprtssis concentrici* »o- 

 tato ; aperturd angulato-lunari ; peristomate simpUci, 

 tenui, viartjine columeltari vix rejlexiuscuto. 



The two-paced Helix. Shell slightly umbihcaU-d, len- 

 ticular, pale horny, shaqily keeled, striated above, 

 sliining below ; whorls six, scarcely convex, but 

 whorl more convex, smooth, marked with a few im- 

 pressed Uncs beneath the keel, which is rather pro- 

 minent ; aperture angiUarly lunar ; lip simple, thin, 

 columellar edge but little reflected. 



Carocolla anceps, Gould, Boston Jouni. Nat. Hist. vol. iv. 

 p.454. p. 24. f. 4. 



ffab. Tavoj', Burmah. 



The stria: which characterize the upper surface of this 

 species are very thickly and irregularly sculptured, and 

 have the appearance of concentric folds. 



For Species 156 see PI. XXXIX. 



Species 157. (Fig. a, b, Mus. Cuming.) 



Helix biangll.4TA. Uel. testa subumiilicatd, contfxo- 

 orbiculari, tenui, comeo-rubella, letUrr striata, miti- 

 diusculd; anfractibus septem, leiite ac- 

 ultimo bicarinato, carina inferiore fitari . 

 riam, superiore per omnes anfraclus atcendaiU ; 

 aperturd lunato-ovali ; perislomate simplici, acuto, urn- 

 bilicum angustissimum fere occultaute. 



The two-angled Helix. Shell slightly umbilicated, 

 convcxly orbicular, thin, lioniy, ruddy, closely stri- 

 ated, rather shining ; whorls seven, increasing slowly, 

 last whorl two-keeled, lower keel thrcnd-like around 

 the ])eripher)', upper keel ascending throughout thi- 

 spire ; apertiu* lunar-oval ; lip simple, sharp, almo.«t 

 concealing the vcrj' narrow umbilicus. 



Pfeiffeh, Pro. Zool. Soc. 1845, p. 40. 



Hab. Province of Cagayan, Isknd of Luzon, Philippines ; 

 Cuming. 

 The upper and lower keels are both seen throughout the 



spire, the latter having o more distinct thread-like form. 



July, 1851. 



