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Richard, J. Campagne scientifique du yacht ,,Princesse- Alice" 

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Ritter, W. E. and Byxbee, E. S. Reports on the Scientific Results 

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Römer, F. Die Thierwelt des nördlichen Eismeeres. (Jahrb. 

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Salensky, W. Zur Morphologie der Cardialorgane der Appendi- 

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Seeliger, 0. Tunicata. (H. G. Bronns Klassen und Ordnungen 

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