HELIX.— Plate C.\ XXVII 



ginibus callo junctis, dexlro arcualo, iaaali dilatalo, re- 

 Jkxo, umbilicitm legmle. 



The little wheel Helix. Shell with a covered um- 

 bilicus, conoidly depressed, striated and covered with 

 oblong granules, rather shining, fulvous, obsoletely 

 marbled with yellow, and encircled with some narrow 

 red bands ; spire depressly conical, with the suture 

 linear; whorls eight, flat, the last sharply keeled, 

 scarcely more convex at the base, rounded, subgib- 

 bous, ochraceous and suddenly deflected in front; 

 aperture lunar-subcircular, white-eallous within ; lip 

 white, margins joined by a callosity, right margin 

 arched, basal margin dilated and reflected, covering 

 the umbilicus. 



Lowe, Faun. Mader. p. 53. pi. tj. f. 10. 



Hnb. Island of Porto Santo, Madeiras. 



It is a peculiarity in this species of the group that the 

 umbilicus, which must be very small, is covered over 

 by the broadly appressed enamelling of the columellar 

 margin. 



Species 859. (Mus. Cuming.) 



Helix tumulorum. Hel. testa subobtecte umbilicatd, tro- 

 ch'iformi, basi convexiusculd, acute carinatd, distiiicte 

 et confei'thii striatd, alba, fasciia fusck interruptis 

 ornald ; spird coined, apice aculiusculd ; anfractibus 

 sex ad septetn, vix convexiusculis, ultimo antice tion 

 descendente ; aperlurd late aiigulato-lunari, intusfus- 

 ciduld ; peristomate simplici, acuto, margine basali re- 

 Jlexiuscttlo, colut/tellari dilatato, perforationem subte- 

 gente. 



The grave Helix. Shell with a covered umbilicus, 

 trochus-shaped, rather convex at the base, sharply 

 keeled, distinctly and closely striated, white, orna- 

 mented with interrupted brown bands ; spire conical, 

 rather sharp at the apex ; whorls six to seven, slightly 

 convex, the last not descending in front ; aperture 

 broadly angularly lunar, brownish within ; lip sim- 

 ple, sharp, basal margin a little reflected, columellar 

 margin dilated, nearly covering tiie umbilicus. 



Webb and Berthelot, Synopsis, p. 315. 



Ilab. Island of Grand Canary. 



A Trochus-shaped species, with a thin simple lip. 



Species 860. (Mus. Cuming.) 



Helix tectiformis. Eel. tettS umbilicatd, depresse te- 

 miglobosd, tenuiusculd, calcared, siipenie leviter striata. 



plerumque detrild, basi confertim granulatd ; spird 

 brevi, obtiisd ; anfractibus septem, planatit, lente ac- 

 crescentibus, ultimo acuti carinalo ; carina late drjlexd, 

 tecti/ormi ; aperlurd trnpezid; peristomate acuto, *m- 

 pertie simplici, recto, basi re/lexiusculo, ad umbiiicum 

 angustum pernio, vix dilatato. 



The roof-shaped Helix. Shell umbilicatcd, dcpn-ssly 

 semiglobose, rather thin, chalk-like, finely striated 

 at the upper part, mostly rubbed, closely granulatcil 

 at the base ; spire short, obtuse ; whorls seven, flat- 

 tened, increasing slowly, last whorl sharply keeled ; 

 keel broadly deflected, roof-like ; aperture trapezoid ; 

 lip sharp, simple and straight at the upper part, a 

 little reflected at the base, scarcely dilated at the um- 

 bilicus, which is open. 



SowERBY, Zool. Journ. vol. i. p. 57. pi. 3. f. 6. 



Hab. Island of Baxo, Madeiras. 



Distinguished by its dead chalk-white appearance and 

 by the irregular pressing down of the keel at the peri- 

 phery. 



Species 861. (Mus. Cuming.) 



Helix saccharata. Hel. testd umbilicatd, pyramidali- 

 conicd, undique conspicue granatd, fuscesceiUe, pur- 

 pureo-fusco maculatd, ad basin fasciatd ; anfractibus 

 septem ad octo, convexiusculis, ultimo obtuse carinato ; 

 aperturd subcirculari ; peristomate wbexpanso, mar- 

 ginibus approximatis, callo fenui junctis. 



The sugared Helix. Shell umbilicatcd, pjTamidally 

 conical, conspicuously grained throughout, light 

 brown, spotted with purple-brown, banded at the 

 base ; whorls seven to eight, rather convex, the last 

 obtusely keeled ; aperture nearly circular ; lip a 

 little expanded, margins approximating, joined by a 

 thin callosity. 



Lowe (Mus. Cuming). 



Hab. Island of Tora, JIadeiras. 



Remarkable for its strongly grained sculpture. 



Species 862. (Mus. Cuming.) 



Helix discixa. Hel. testd umbilicatd, depressd, granu- 

 latd, fuscescente-atbd, purpureo-fusco fasciatd et ra- 

 riegatd ; ai\fraclibus septem ad octo, plano-convfzis, 

 ultimo acute carinato ; aperturd subcirculari ; peristo- 

 mate vix expanse, marginibus approximatis, callo tenui 

 junctis. 



