44 
Helix lenticula dCOrbigny Canar, p. 66. t. 2. fig. 10 — 12. 
— — Lamarck edit. Deshayes VIII. p. 128. n. 211. 
— — Pfeiffer Monogr. I. p. 211. n. 555. 
— — Heeve Conch. icon. Hei. t. 140. fig. 885. 
— subtilis Lowe Primit. p. 45. n. 19. t. 5. fig. 13. 
Habitat in Madera et Portosancto, ad agros, sub lapidibus. Satis frequens. 
Specimina maderensia nullo modo ab europaeis discrepant. 
Sectio Janulus. *) 
Testa umbilicata, depressa, orbiculata, supra costulato- striata, siiblaeviuscula; an- 
fractus 7 — 8^- arcte voluti, ultimus basi convexus; apertura lunaris; peristoma simplex, 
tenue, intus annulato- callosum. 
^48. Helix bifrons Lowe. 
Tab. 11. Fig. 13 — 16. 
Testa umbilicata, orbiculato -convexiuscula, solidula, nitida, corneo-virens, supra 
regulariter oblique costulato -striata, infra laeviuscula, radiatim obsolete striata; spira vix 
elevata; sutura distincta, impressa; anfractus arcte voluti, ultimus supra angulatus, basi 
convexus, ad umbilicum augustum, pervium impressus; apertura diagonalis, lunaris; peri- 
stoma simplex, tenue, acutum, intus latissime albo labiatum. 
Diam. maj. 1 2, miii. \ 0^, ait. millim. 
Helix bifrons Lowe Priinil. p. 46. n. 24. t. 5. fig. 18. 
— — Pfeiffer Monogr. I. p. 144. n. 373. 
— — — in Ghemn. II. Hei. pars 2. p. 234. n. 698. 1. 111. fig. 23 — 25. 
— — Reeoe Conch. icon. 1. 139. fig. 881. 
Habitat in Madera, praecipue in regione Castanearum, in gramineis sub lapidibus. 
Haud rara. 
49. Helix stephanopbora Deshayes. 
Tab. 11. Fig. 17 — 20. 
Testa umbilicata, depresse -conoidea, solidiuscula, superne confertim et valide co- 
stata, lutescenti -cinnamomea, basi pallidior, nitidula, laevigata, subtiliter striata; spira pa- 
rum elevata, acutiuscula; sutura profunda; anfractus 8 arctissime voluti, ultimus medio 
carinato -angulatus, basi vix convexior, ad umbilicum mediocrem, pervium, leviter impres- 
') Lowe Synopsis p. 6. 
