HELIX. 



Plate XC. 



Species 483. (Mus. Cuming.) 



Helix bistrialis. Hel. testa subumbilicatd, globoao- 

 depressd, temti, fragili, sublilmivte driatd, striis con- 

 ferlis obsoletii sub lente decmsatd, slramineo-conied, 

 lineh rujis approximatis medio cincld ; -ipird vix con- 

 vexd ; anfraelibm qiMtuor, planiuscuUs, rapide accre- 

 scentibus ; aperturd ampld, lunari-ovali ; peristomate 

 simpUci, margine coliimellari recurvato. 



The two-stuiated Helix. Shell slightly umbilicated, 

 globosely depressed, thin, fragile, very finely striated, 

 decussated beneath the lens with obsolete close-set 

 stria;, straw-homy, encircled round the middle with 

 two approximating red lines ; spire but little convex ; 

 whorls foiu', rather Hat, increasing rapidly ; aper- 

 ture large, lunar-oval ; lip 3ini|)le, columcUar edge 

 recurved. 



Manilla bistrialis. Beck. Ind. p. i. 



Helix exilis, Chemnitz (not of Miiller). 

 Helix diapliana, Lea. 



Hub. Fondicherry, Tranquebar. 



Of the two characteristic red lines which encircle this 

 shell, the upper one appears in the place of the suture. 

 The lines which are engraved on the upper part of the 

 whorls in a spural direction are rather distant, and look 

 like faint OTOoves. 



Species 484. (Mus. Cuming.) 



1Ieli.\ Najas. Hel. testa imperforatd, depresso-ylobosd, 

 tenui, sublili-isime striata, sub epidermide decidiid lutes- 

 cente hyalind, albd ; spird brcvi ; atifractibus qualuor, 

 convexiusciilis, ultimo valde injiato ; columella leviter 

 arcuatd; aperturd parum obliqud, luiiato-ovali ; peri- 

 stomate simplici, midique breviter expanso. 



The Najas Helix. Shell imperforated, depressly glo- 

 bose, thin, very finely striated, hyaline, beneath a 

 deciduous yellowish epidermis ; spire short ; whorls 

 four, rather convex, the last much inflated ; columella 

 arched ; aperture but little oblique, lunar-oval ; lip 

 simple, shortly exi)anded throughout. 



Pfeiffeii, Syraboliu, vol. iii. p. 71. 



Hab. Java. 



A very delicate swollen hyaline shell, partially covered 

 with a thin yellowish-horny epidermis. 



Fig. 485 a, b. (Mus. Cuming.) 



These are two varieties of H. citrina, which have very 

 much the appearance of being a distinct species. They 

 are more globose in form ; and there is a peculiarity in 

 the bright canielion-red colouring of the apex. 



Species 486. (Mus. Cuming.) 



Helix ualata. Hel. testd tix umiilicald, suhglobosii, 

 subhyalind, solidd, Uevigatd, vividi c<erulesceiUe-mridi, 

 basi et apice albicantiiiis ; spird obtusd ; anfrdctilmn 

 quinque ad sex, convexis; aperturd subquadralo-lunnri : 

 peristomate simplici, juxta columellam breviter refiexo. 



The blue-green Helix. Shell scarcely unibilicati-d, 

 somewhat globose, subhyaline, solid, smooth, bright 

 blue-green, whitish at the base and apex ; spire ob- 

 tuse ; whorls five to six, convex ; aperture somewhat 

 scjuarely lunar; lip simple, shortly rctlected next the 

 columella. 



MoussoN, Land, und Suss. Moll. Java, p. 112. pi. 21. f. 2. 



Hab. Java. 



A shell of simple structure, distinguished by a pcculinrly 

 delicate verdigris-colour. 



Species 487. (Mus. Cuming.) 



1 1 KLix I'LATYSTYLA. Hel. testd imperforatd, coiiied, solidn, 

 coslulato-striatd, albidd, lined rufd ad suturam onwid ; 

 spird conicd, acutinscutd ; anfractibus sex, coHcexiu*- 

 culis, sensim accrescent ibus, ultimo obsolete oHgutnto. 

 basi subplano ; aperturd obliqud, late lunari ; peristu- 

 mate simplici, margiuibus subremolis, deilro breriirr 

 expanso, columellari perdilatato, calloso. 



The THiCK-i'iLLAR Hklix. Shell imperforated, tinuc, 

 solid, rib-like striated, whitish, ornnmented at tlic 

 suture with u red line ; spire conic, rather sharp ; 

 whoris six, rather convex, increasing gradunlly, tin 

 last obsoletely angled, rather flat at the base ; apT- 

 ture oblicpie, broadly-lunar ; lip simple, margins 

 rather distant, right margin shortly cxpaudi'd, colii- 

 mcUar margin very much dilated and callous. 



Pfeiffeu, Pro. Zool. Soe. 1^49. p. 130. 



Hab. Molucca Islands ? 



The shell here figured, the specimen described by l»r. 



PfeitTer, is not in good condition. In a finer state it 



April, 1852. 



