Zu 3:
Zu 5:
Zu 7:
Zu 9:
Zu 13:
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Zu 4:
Zu 8:
Zu 10:
Zu 12:
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Quelle: Taylor, J. W. (1894-1914): Monograph of the land and freshwater Mollusca of the British Isles. Volumes 1 - 3. Taylor Brothers, Leeds.