HELIX. 



Plate CVIII. 



Species 603. (Mus. Cuming.) 



Helix approximata. lid. testa umhilicatd, albreciato- 

 conicd, carinatd, fused, cinereo-lutescente variegatd ; 

 anfractibm sex, subconvexis, ba-ii riepressis, ultimo mar- 

 gine acuta, subtus convexo, radiatim tenuiter striolato, 

 striis concenlricis siguato ; spird conico-depressd ; um- 

 bilico pro/undo ; aperturd oblique quadratd, incrassatd, 

 anierius acutd, supine productd exteriusque com- 

 pressd. 



The allied Helix. Shell umbilicatcd, shortly conical, 

 keeled, brown, variegated with ash-yellow ; whorls 

 six, slightly convex, depressed at the base, edge of 

 the last whorl sharp, convex beneath, radiately finely 

 striated, marked with concentric stria; ; spire coni- 

 cally depressed ; umbilicus deep ; aperture obliquely 

 quadrate, thickened, sharp in front, produced at the 

 upper part, and compressed outwardly. 



Le Guillou, Ecvue Zool. See. Cuv. 1842. p. 139. 



Hab. Island of Ternate. 



The variegated ash-yellow colouring of tliis shell arises 

 from the promiscuous sprinkling of a thin epidermis upon 

 a dark-brown band next the keel. 



Species 60i. (Mus. Cuming.) 



Helix Beaediaka. Ilel. testd umbilicatd, subghboso-tur- 

 bittatd, tenui, corneo-fuscd, pellucidd, obligui creberrime 

 plicato-striafd ; anfractihus quinque, convexis, ultimo 

 obtuse carinato, tumidiusculo ; aperturd lunato-circu- 

 lari ; peristomate tenui, subeipanso. 



Beabd's Helix. Shell umbilicatcd, somewhat globosely 

 turbinated, thin, homy-brown, transparent, obliquely 

 very closely plicately striated ; whorls five, convex, 

 the last obtusely keeled, rather swollen; aperture 

 Innately circular ; lip thin, a Little expanded. 



Pfeiffek, Pro. Zool. Soc. 1851. 



Hab. Island of Bourbon. 



A transparent brown-homy shell, covered in parts with 

 a light opake freckled epidermis. 



Species 605. (Mus. Cuming.) 



Helix Zollingeri. Eel. testd subampliler umbilicatd, 

 depressissimo-conicd, subtus medio excavatd, laevigata, 

 saturati ru/o-brunned ; spird obtusd ; anfractibwt quin- 



June, 



que, plano-convexis, tenuimargiiiatit, ultimo aculiMimi 

 carinato; aperturd depressosecuriformi, labro tim- 

 plici. 



Zollin-geu's Helix. Shell rather largely umbibcnted, 

 very depressly conical, excavated in the middlc- 

 bencath, smooth, dark red-brown ; spire obtuiM.- . 

 whorls five, flatly convex, thinly margined, last whorl 

 very sharjily keeled; ajjcrturc depressly h.itchit- 

 shaped, lip thin. 



Pfeiffer, Pro. Zool. Soc. 1851. 



Hab. .lava. 



A flatly compressed, largely umbilicatcd shell, of a pecu- 

 liar dark red-brown colour. 



Species 606. (Fig. a, b, Mus. Cuming.) 



Helix Trochiformis. Hd. testd umiiticata, tolidd, 

 Trochiformi, a pice obtusd, basi plana, acuti carimila, 

 oblique ruguloifO-striatd, saturati rufd vel fusco-lMlrd, 

 nigricante-fasciatd ; aufractibus Srx, supra cnrinaii 

 prominentem stramineam tel opaco-albam concexiiucu- 

 lis ; umbilico angusto, pernio ; aperturd irregidanter 

 rhombed ; peristomate superni simplici, recto, antrvr- 

 sum dilatato, margine columellari recti detcendeHtr. 

 subdilatato, basali refexiusculo. 

 The TROcnrs-sOAPED Helix. Shell umbilicatcd, solid, 

 Trochus-shaped, obtuse at the aptx, flat at the base, 

 sharply keeled, obliquely rugulosely striated, dark 

 red or brownish-yellow, banded with brown-black . 

 whorls six, rather convex above the keel, which n 

 straw-coloured or opake-whitc ; umbihcus nam>w, 

 open ; aperture irregularly rhomboid ; lip simple am) 

 straight at the upper part, dilated in front, colunu-i- 

 lar raar^n descending struightly, somewhat dilated, 

 basal margin a little reflected. 

 Fercssac, Prodrome, p. 301. 



CarocoUa circtimdata, Miihlfeldt. 

 Hab. Ishinds of Taliiti and Opara. 



The colour and marking of this species is extremely 

 variable. The specimen rcprtseuted at Fig. 606 a is en- 

 circled with a broad brow^n-black band, against which the 

 fine keel is opake-whitc. That at Fig. 606 A is simple, 

 encircled with a red line upon a slmw-colourcd ground. 



1852. 



