A TREATISE ON ZOOLOGY 



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Part II. 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. 



Part III. 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 IV. THE PLATYHELMIA, MESOZOA, 

 AND NEMERTINI 



By W. BLAXLAND BENHAM, D.Sc. (Lond.), M.A. (Oxon.), Pro- 

 fessor of Biology in the University of Otago, New Zealand ; 

 formerly Aldrichian Demonstrator of Anatomy in the University 

 of Oxford. 



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