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Morphology of bivalves
The influence of man on the molluscan fauna
2 other sections not shown
Abida secale adult Alps altitudes aperture apex Austria axial bands bivalves blunt body whorl Britain British Isles brownish callus Carpathian chalky coiled columellar compressed conical spire convex whorls Czechoslovakia damp dark brown dextral Discus rotundatus Distribution DRapaRnaud edge endemic species European Family fauna flat forests forms freshwater fusiform gastropods genus Glass Snail grey greyish grooved ground colour growth lines Habitat Helicella Helicella itala Holarctic Hungary irregularly keel lamella last whorl light brown limestone Linnaeus live mantle shield margin is sharp Mediterranean mildly molluscs mountains narrow northern oblique operculum oval parietal wall periostracum pomatia Pomatias elegans posterior protoconch reddish brown region relatively ribbing rivers rocks rounded shape shell sinistral Size of shell slightly slug Snail sometimes specimens spiral stripes surface suture teeth thick thick-walled thin thin-walled translucent Trichia Trichia hispida umbilicus umbones upper USSR usually valves variable western white lip whitish wide widened width yellow yellowish Yugoslavia