A TREATISE ON ZOOLOGY 



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Part II. THE ECHINODERMA 



BY F. A. BATHER, M.A. 



Assistant in the Geological Department of the British Museum 



ASSISTED BY 



J. W. GREGORY, D.Sc. 



Late Assistant in the Geological Department of the British Museum, 

 Professor of Geology in the University of Melbourne 



AND 



E. S. GOODRICH, M.A. 

 Aldrichian Demonstrator of Anatomy in the University of Oxford 



Part III. THE PORIFERA & COELENTERA 



BY 



E. A. MINCHIN, M.A. 



Professor of Zoology at University College, London 



G. HERBERT FOWLER, B.A., Ph.D. 



Late Assistant Professor of Zoology at University College, London 



AND 



GILBERT C. BOURNE, M.A. 

 Fellow and Tutor of New College, Oxford 



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