110 IIELIX §. 12. 



convexiusculi , rapide accrescenles, ultimus iatus, cleprcssus, pe- 

 ripheria rotundatus, antice non desccndens; apertura lunato- 

 rotundata; perist. simplex, acutum, margine supero antrorsum 

 arcuato, columellari non reflexo. — Diam. niaj. 15 '/2, min. 13, 

 alt. 5'/. mill. (Goll. Nr. 144.) 



Helix vitrina Wagner in Spix p. 25. 



— — Chemn. ed. II. Helix N. 51 6. t. 8 i. f. 1 4 — 1 6. 



— circmnplexa Fer. hist. p. 19 t. 8 4. f. 5. 6. 



— valvaeformis Nyst in schcd. 



Solarium imperforatum Spix test. bras. t. 17. f. 6. 

 Helicella imperforata Beck ind. p. 7. 

 /?. Junior: H. nana Wagn. 1. c. — Solariuni pygmaeum Spix t. 17. f. 7. 



Habitat in Brasilia australi. 



280. H. ammoniformis Orbigny. 



T. late umbilicata, orbiculato-concava, depressa, tenuis, dia- 

 phana, albido-grisea, sublaevigata; spira subimpressa; anfr. 5 de- 

 pressi, ultimus perdilatatus ; apertura oblique lunato-ovalis;perist. 

 simplex, acutum, marginibus conniventibus, supero antrorsum 

 curvato. — Diam. maj. 14, min. 12, alt. 4 mill. (Mus. Cuming.) 

 Helix ammoniformis (Helicella) Orb. synops. p. 5. 



— — Or6. voy. p. 248.' t. 2 6. f. 10— 13. 



— — Desh. in Fer. hist. p. 9. t. 69 F. f. 1, 

 Habitat in provincia Yungasensi Boliviae. 



Obs. Differt ab H. vilrina umbilico multo laliore . elc. 



'281. H. aulacospira Ffr. 



T. late umbilicata, depressa, discoidea, tenuis, irregulariter 

 et leviter malleata, lineis impressis, concentricis , confertis regu- 

 lariter sulcata, lutescenti-cornea; spira plana; anfr. 4/2 depressi, 

 celeriter accrescentes, ultimus non descendens; umbilicus latus, 

 perspectivus ; apertura subverticalis, oblique lunato-ovalis; perist. 

 simplex, tenue, margine columellari non reflexo. — • Diam. maj. 

 12, min. 10, alt. 4 '/2 mill. (Mus. Cuming.) 



Helix aulacospira Pfr. in Proc. Zool. Soc. 18 46. p. 37. 

 Habitat . . . ? 



282. H. concolor Ferussac. 



T. umbilicata, discoidea, laevigata, substriata, fulva, castaneo 

 alternatim strigata; spira plana; sutura linearis; anfr. 4 celeriter 

 accrescentes, ultimus major, superne depressus, basi convexior; 

 apertura lunato-subcircuiaris; perist. simplex, acutum, margini- 

 bus subapproximatis. — Diam. maj. 1 4 , min. 1 2 , alt. 6 mill. 



