Structura calicis concavi motoris est: operculum dorsi, terminalis, peniculus extremitatis operculum, penicillus, commutator, calicis cochleus, scapus rotatus, scapus, fullo ferens, domicilium, magnes (stator), flange, anulus positus. Stator constans ex magnete permanenti, concha et LABIUM. In habitationi praebet ac
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