HELIX. 



Plate XXXVI. 



Species 158. (Mus. Cuming.) 



Helix filocincta. Uel. testa umbilkatd, depreud, lenui, 

 pellucidd, corned, striatuld, nitidd; spird parum ele- 

 catd, oldtisd ; aiifraclifjiis quinqiie ad sex, convexim- 

 culis, cariuatis, ultimo l/asi convexo ; carindfiliformi, 

 in anfradibus superioribus compiciid, sed uon exsertd; 

 aperliird verticali, limato-sidmiiriformi ; peritlomate 

 dmplici, recto, viargine columellari perobliquo, elon- 

 gato, descendente, ad dextnim subito ascendente. 



The thread-gikt Helix. Shell umbilieated, depressed, 

 thin, pellucid, homy, finely striated, shining; sjiire 

 but little elevated, obtuse ; whoris five to six, rather 

 convex, keeled, last whorl convex at the base ; keel 

 tliread-like, conspicuous in the upper whorls, but not 

 exserted ; aperture vertical. Innately subauriform ; 

 Lp simple, straight, columellar margin very oblique, 

 elongated, descending, ascending suddenly to the 

 right. 



Pfeiffek, Pro. Zool. Soc. 1845, p. 124. 



Hab. Cagayan, Province of Misamis, Island of Mindanao, 

 Pliilippines; Cuming. 



The keel of this little horny species is rather prominent, 

 and passes around the spire like a fine thread. 



Species 159. fFig-a, b, Mus. Cuming.) 



Helix orthostoma. Hel. tesid umbilicatd, depressa, 

 superne confertim subarcuato-striald, tenui, pellucidd, 

 pallide corned; spird vix elevatd, obtusd ; anfractibus 

 sex, angustis, convexls, siitnri-s impressis, ultimo basi 

 sublavigaio ; nmbilico majusculo, cylindraceo ; aperturd 

 verticali, oblique lunari ; peristomate simplici, acuto, 

 margine supero brevi, ba.iali valde arcuafo, columellari 

 dilatalo, sinuato. 



The stkaight-mouth Helix. Shell umbilieated, de- 

 pressed, closely subarcuately striated above, thin, 

 pellucid, pale horny ; spire scarcely raised, obtuse ; 

 whorls six, narrow, very convex, with the sutures 

 impressed, last whorl rather smooth at the base; 

 umbilicus somewhat large, cylindrical ; a])erturc ver- 

 tical, obliquely lunar; lip simple, sharp, upper edge 

 short, basal edged much arched, columellar edge di- 

 lated, sinuated. 



Pfeiffek, Pro. Zool. Soc. 1845, p. 124. 



Hab. Dingle, Island of Panay, Philippines ; Cuming. 



July, 



The whorls of this little species are so convex at the 

 upper jiart as to give the sutures of the spire a ven, im- 

 pressed character. 



Species 160. (Fig. a, b, Mus. Cuming.) 



Helix stexgilis. Uel. testa umbilicatd, depresta, lenli- 

 culari, tenui, pellucidd, pallide corned, acute cariiuUd ; 

 npird parum elevatd; atifractibus sex, angtutis, tiz 

 contexiusculii, superne confertim radiatim costulato- 

 striatis, lineis elecatis, spiralibus reticuhtis, ultimo 

 Ija-ii convexiore, lacigaio, nitido ; umbilico mediocri, 

 cylindraceo ; aperturd subnerlicali, angulato-lunari ; 

 peris/ornate simplici, acuto, margine supero brevi, ba*ali 

 valde arcuato. 



The finely streaked Helix. Shell umbilieated, de- 

 pressed, lenticular, thin, pellucid, pale homy, sharply 

 keeled ; spire but little raised ; whorls six, narrow, 

 slightly convex, closely radialely sculptured with 

 minute rib-like strife and reticulated with raised 

 spiral lines, last more convex at the base, smooth, 

 shining; umbilicus middling, cylindrical; aperture 

 subvcrtical, angularly lunar ; lip simple, acute, upper 

 edge short, basal edge much arched. 



Pfeiffeu, Pro. Zool. Soc. 1845, p. 124. 



Hab. Island of Negros, PhiUppines ; Cuming. 



Well distinguished by the minutely reticulated sculpture 



of the upper surface of the whorls. 



Species 161. (Fig. a, b, Mus. Cuming.) 



Helix succinea. Hel. testd depressa, obsolete subumbi- 

 licatd, tenui, pellucidd, nilidd, succined, medio saturate 

 fasciatd; suturd mediocri, submarginatd ; anfraetibu* 

 quinque, celeriter arcrexcentibus, n> coiirexiusculit ■ 

 aperturd lunari ; peristomate simplici, acuta, margiite 

 columellari subreflexo, umbilicum obsoletum tegeutt. 



The amber Helix. Shell depressed, obsoletely slightly 

 umbilieated, thin, pellucid, shining, nmbcr-coloun-d. 

 banded darker round the middle ; sutUR" miildling, 

 slightly margined; whorls five, increasing mpidU, 

 scarcely convex ; aperture lunar; lip simple, sharp, 

 columellar edge a little reflected, covering the obso- 

 lete umbilicus. 



Pfeiffer, Pro. Zool. Soc. 1^45. p. 3;>. 



Hab. Island of Luzon and Mindoro, Philippines ; Cuming. 



1851. 



