17 
Genus II. 
Helix. 
Testa umbilicata, perforata vel imperforata, discoidea, globoso -depressa vel co- 
noidea; apertura transversa, obliqua, lunaris vel subrotunda, marginibus distinctis, remotis 
vel callo junctis. 
Sectio Hy.alina.*) 
Testa umbilicata vel perforata, depressa, vitrea, nitida; anfractus 5 — 6 regulariter 
accrescentes, ultimus ad aperturam non descendens; apertura rotundato -lunaris; peristoma 
(enue, rectum. 
^ 1. Helix cellaria Mulier. 
Tab. 2. Fig. 15 — 17. 
Testa aperte umbilicata, depressa, planiuscula, nitida, subpellucida, striatula, pal- 
lide virenti -cornea, subtus albida; anfractus 6 planiusculi, ultimus depressus; apertura vix 
obliqua, depressa, lunaris; peristoma simplex, acutum, margine columellari non reflexo. 
Diam. maj. 12, min. lOy, ait. 5 millim. 
Helix cellaria Mulier Verm. II. p. 28. n. 230. 
— — Lamarck edit. Deshaycs Tom. 8. p. 71. n. 95. 
— — Pfei/J'er Monogr. I. p. 113. n. 285. 
— — — in Chemn. II. Helix pars 2. p. 102. n. 517. t. 84. flg. 8 — 10. 
— — Lowe Primit. p. 47. n. 25. 
Habitat in Maderae et Portosancti cultis et dumetis. Frequens. 
Specimina maderensia ab europaeis nullo modo discrepant. 
2. Helix crystcallina Mulier. 
/ Tab. 2. Fig. 18—21. 
Testa perforata, depressa, vitrea, diaphana, glabra, nitidissima; anfractus 4^- pla- 
nulati; apertura lunaris; peristoma rectum, simplex. 
Diam. maj. 3, min. 2^, ait. millim. 
Helix crystallina Mulier Venn. II. p. 23. n. 223. 
— — Lamarck edit. Deshayes Tom. 8. p. 87. n. 128. 
— — Draparnaud hist. p. 118. n. 56. t. 8. fig. 13 — 20. 
— — Pfeiffer Monogr. I. p. 59. n. 127. 
*) Albers Heliceen p. 66. 
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