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Keywords from Image Description:
Haeckel Amphoridea. See mpizkoeln mpg de html here for index to numbers Placocystis crustacea Haeckel Meek Billings Billings Barrande Barrande Barrande Haeckel Kloeden Jaekel Barrande Barrande Barrande Barrande Mller Abildgaard Mller Mller Linnaeus Mller Dben Koren Chun Verrill auricularia larva See Protankyra