110 HELIX §. 12. 



convexiusculi , rapide acerescentes , ultimus latus , depressus , pe- 

 ripheria rotundatus, antice non descendens; apertura lunato- 

 rotundata; perist. simplex, acutura, margine supero antrorsum 

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

 alt. 5y2mill. (Coll. Nr. 144.) 



Helix vitrina Wagner in Spix p. 2S. 



— — Chemn. ed. II. Helix N. 516. t. 84. f. U — 16. 



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



— valvaeformis Nyst in sched. 



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

 Helicella imperforata Beck ind. p. 7. 

 /3. Junior: H. nana Wagn. I. c. — Solarium pygmaeum Spix t. 17. f. 7. 



Habitat in Brasilia australi. 



280. H. ammoniformis Orbigny. 



T. late umbilicata, orbiculato-concava, depressa, teiiuis, 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. 2 48. t. 2 6. f. 10— 13. 



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



Habitat in provincia Yungasensi Bohviae. 



b s. Differt ab H. vilrina umbilico raulto laliore , elc. 



281. H. aulacospira Ffr./^J:/?..^:^i';:/^ :''.y(^^ 



1. late umbmcata, depressa, discoidea, tenuis, nTegulariter 

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

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

 celeriter accrescentes, ultimus non descendens; umbilicus latus, 

 perspectivus ; apertura subverticalis, obHque 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. 1846. p. 37. 

 Habitat . . . ? 



282. H. concolor Ferussac. , , v. 



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

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

 accrescentes, ultimus major, supeme depressus, basi convexior; 

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

 bus subapproximatis. — Diam. maj. 14, min. 12, alt. 6 mill. 



