HELIX.— Plate CXXXVI. 



Curiously resembling certain varieties of Helix Lkteri 

 of the Philippines. 



Species 850. (Mus. Cuming.) 



Helix Webbiana. Eel. testa, imperforatd, auhdkcoided, 

 suitus convexii, acute carinatd, tenui, diaphand, corneo- 

 vireacente, mhmlmime grauiilatd; spirdl/revi, conoided, 

 oMusd; anfractibus tribm, rapidi crescent ibus, vix con- 

 vexiusculk; aperturd ampld, perobUqud, ovali, intus 

 nitidissinid ; peristomate simplicl, acuta, margine colu- 

 viellari arcuato, dilatato, basali hreoiter rejlexo. 



Webb's Helix. Shell imperforated, subdiscoid, convex 

 beneath, shai-ply keeled, thin, diaphanous, horny- 

 greenish, vei-y minutely granulated ; spire short, co- 

 noid, obtuse ; whorls three, increasing rapidly, 

 slightly convex; aperture large, very oblique, oval, 

 shining mthin ; lip simple, sharp, columellar margin 

 arched, dilated, basal margin shortly reflected. 



Lowe, Faun. Mader. p. 44. pi. 5. f. 10. 



Hab. Island of Porto Santo, Madeiras. 



Chiefly distinguished by the oblique enlargement of the 



aperture. 



Species 851 . (Mus. Cuming.) 



Helix furv.\. Eel. testa imperforatd, subglobosd, tenui, 

 obsolete rugulosd et malleatd, lutescente, fuseo nnifas- 

 ciatd, epidermide umbrind indutd ; anfractibus sex, 

 subplanatis, ultimo subaugulato, basi convexo, antici 

 paulum descendenie ; suiurd distinctd ; aperturd ro- 

 tundalo-lunari ; peristomate simplici, acuto, margiue 

 columellan subincrassato. 

 TuE DUSKY Helix. Shell imperforated, subglobose, 

 thin, obsoletely wrinkled and indented, yellowish, 

 encircled with a brown band, and covered with a 

 shadowy epidermis ; w^horls six, rather flattened, the 

 last sligiitly angled, convex at the base, a little de- 

 scending in front ; suture distinct ; aperture rotun- 

 dately lunar ; lip simple, shai-p, columellar margin 

 rather thickened. 

 Lowe, Faun. Mader. p. 40. pi. o. f. 2. 

 Eab. Madeira. 



The band is not unfrequently interrupted, so as to pro- 

 sent a beaded pattern. 



Species 852. (Mus. Cuming.) 



Helix advena. Eel. testa imperforatd, depretso-ghbosd, 

 tenui, creberrime undulato-striatd, pallide corned, fat- 

 cid laid livido-fnscd, sape albo-maculald supra peri- 

 pheriam, fasciis duabua angustioribus obsoletis subtut 

 notatd ; anfractibus quatuor, contexiusculis, ultimo 

 anlice sensim descendenie ; aperturd lunalo-subcircu- 

 lari ; peristomate simplici, margine supero subexpanto, 

 columellari dilatato-appresso. 



The strange Helix. Shell imperforated, depressly 

 globose, thin, very closely undulately striated, pale 

 homy, encircled \vith a broad livid-brown band, often 

 white-spotted above the peripher)-, and two narrower 

 fainter bands below it ; whorls four, rather convex, 

 the last gradually descending in front ; aperture 

 lunar-subcircular ; lip simple, upper margin rather 

 expanded, columellar margin dilately appressed. 



Webb and Beutuelot, Synopsis, p. 324. D'Orbigny, 

 MoU. des Isles Canaries, p. 58. pi. 1. f. 18-20. 



Hab. Island of Teneriffe, Canaries. 



The dilately appressed columellar margin is of an 

 orange-carnelian enamel-like colour. 



Species 853. (Mus. Cuming.) 



Helix Wollastoxi. Eel. testa imperforatd, depressd, 

 undique oblique plicato-corrugatd, acute carinatd, oli- 

 vaced, obscure fusco-fasciatd ; anfractibus quinque, pla- 

 nulatis, infra carinam convexis, ultimo antice descen- 

 denie ; aperturd trigono-ovali ; peristomate tenui, viz 

 re/lexo, marginibus roseis, callo roseo junclis, columel- 

 lari plano-appresso. 



Wollaston's Helix. Shell imperforated, depressed, 

 obli(iuely plicately wrinkled throughout, shaqily 

 keeled, olive, faintly banded with brown ; whorls 

 five, flattened, convex beneath the keel, last whorl 

 descending in front ; aperture triangularly oval ; lip 

 thin, scarcely reflected, margins pink, joined by a 

 pink callosity, columellar margin flatly appressed. 



Lowe, Aim. and Mag. Nat. Hist. vol. ix. p. 119. 



Eab. Island of Porto Santo, Madeiras. 



This species resembles H. pllcaria in sculpture, but dif- 

 fers in the form and delicate painting of the aperture. 



