11. "' Streptaxoidea "'is a terrestrial pulmonate gastropod mollusks in the Stylommatophora. 12. The British manufacturers of Amerscan Pulmonate Two said the withdrawal was " purely precautionary ." 13. They are aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails. 14. "' Helicarionidae "'is a terrestrial pulmonate gastropod mollusks in the superfamily Helicarionoidea. 15. "' Subulinidae "'is a terrestrial pulmonate gastropod mollusks in the superfamily Achatinoidea. 16. "' Polygyridae "'is a terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea. 17. "' Orculidae "'is a terrestrial pulmonate gastropod mollusks in the order Pulmonata. 18. "' Xanthonychidae "'is a terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea. 19. "' Urocoptidae "'is a terrestrial pulmonate gastropod mollusks in the superfamily Urocoptoidea. 20. "' Cerionidae "'is a terrestrial pulmonate gastropod mollusks in the superfamily Urocoptoidea.