HELIX. 



I'LATE CLXXXI. 



Species 1245. (Mus. Pfeiffer.) 



Helix Ziebetkuli. IM. /es/d conoidea, Irochiformi, 

 minute umhilicatd, sordidi albd, apice conieii ; ttpird 

 turrild ; aiifractibus quinque, denne lenue pUcato-annu- 

 lalis, ultimo basi plaiio-convexd ; apertiird pared, iiitus 

 earned, labro siiiiplici. 



Ziebetuul's Helix. Shell conoid, trocbus-sbaped, mi- 

 nutely unibilicatcd, dead white, horny at the apex ; 

 spire turretcd ; whorls five, rounded, densely finely 

 plicately ringed, the last flatly convex at the base ; 

 aperture small, flesh-tinged within, lip simple. 



Albeks, PfeifTer, MSS. 



Ilai. ? 



A small Sciilaria-i\\i(i shell, with a turrcted pyramidal 

 spire, annulated throughout with fine plait-like rings. 



Species 124G. (JIus. Pfeiffer.) 



Helix AmmonITOIDES. Ifel. tnld iuvoliUd, utrinque 

 umbilicatd, coiifirtmime Jiloso-plicatd, corned, rnfo 

 obsolete striyatd ; spird immersd ; anfractibm quatuor, 

 rotundalis ; aperturd siibverlicaU, lunari, labro isini- 

 plici, marg'mibiis remotis. 



TuE Ammonite-like Helix. Shell involute, umbili- 

 cated on both sides, very closely thread-plaited, horny, 

 obsoletely red-streaked ; spire immersed ; whorls four, 

 rounded ; aperture subvertieal, lunar, lip simple, mar- 

 gins distant. 



Helix omicron, Pfeiffer, Zeitschrift fiir Malac. 1851, p. 128. 



I[ab. Australia. 



A small nautiloid species, the spire being completely im- 

 mersed, making the shell to be umbilicatod on both sides. 



Species 1247. (Mus. Pfeiffer.) 



Helix TROCHILIONIDES. Ilel. tesid miblati umbilicatd, 

 orbiculato-convexiiisculd, tenuinlriatd, pellucido-aibd ; 

 spird vix elevatd ; anfraclibiis iex, planiuiculia ; aper- 

 turd subcerticali, liiuuto-subcirctilari, labro recto, acuta, 

 maryinibnts connitentihim. 



The little trochoid Helix. Shell rather broadly 

 unibilicatcd, orbicularly slightly convex, finely striated, 

 transparent white ; spire scarcely raised ; whorls six, 

 rather flat; aperture subvertieal, lunar-subcircular, 

 lip straigiit, sharp, margins approximating. 



J line. 



D'Orbigny, Voy. dans rAmer. Mcrid. p. 251. p. 27. f. 



12, 15. 

 Uab. Bolivia and near Lima, Peru ; D'Orbigny. 



Of simple flatfish growth, somewhat perspectively um- 

 bilicated. 



Species 1248. (Mus. Pfeiffer.) 



Helix EL.\t.\. Ilel. teuld minute umbilicatd, conicd, bati 

 planulatd, mrdUle albd ; spird pyramidali ; anfracti- 

 bui octo, plano-declivibiu, oblique coitato-striatit, ad 

 periphcriam acute ftlo-carinatii ; aperturd tecuri/ormi, 

 labro simplici, acuta. 



The raised Helix. Shell minutely umbilicated, coni- 

 cal, flat at the base, dead white ; spire pyramidal ; 

 whorls eight, flatly slanting, obliquely rib-striated, 

 sharply thread-keeled at the periphery; aperture 

 hatchet-shaped, lip simple, sharp. 



Faube-Bigi'et, Ferussac, Prodrome, No. 304. 



Hab. Capri, Sicily ; Philippi. 



Of a sharply conical pjTamid form, obliquely rib-striated 

 throughout. 



Species 1249. (Mus. Pfeiffer.) 



Helix compar. IM. testa ampliter umbilicatd, depresad, 

 sordide olicaced, fasciis nijis duabus spiralibus ; spird 

 subcanaliculatd ; anfractibus sex ad septem, supemr 

 obtuse angulatis, infra rotundalis, striis plicalis albi- 

 dis connpicuis eleganter annulatis ; aperturd perobliqud, 

 subcirculari, margine continuo, aliido, subexpanso. 



TuE like Helix. Shell largely umbilicated, depressed, 

 dull olive, with two red spiral bands ; spire slightly 

 channelled ; whorls six to seven, obtusely angled at 

 the upper part, rounded below, elegantly ringed 

 throughout with conspicuous whitish plait-like striw : 

 aperture very oblique, nearly circular, margin ron- 

 tinuous, whitish, subexpnnded. 



Lowe, Paun. Mader. p. 48. pi. 5. f. 23. 



Uab. Madeira. 



Exquisitely sculptured throughout with prominently 

 raised plait-like rings. 



SpccH - i-.in. 1^ Mus. Pfeiffer.) 

 Helix Schombrii. Ilel. testd umbilicatd, tubdepretsd, 

 1854. 



