TEEATISE ON ZOOLOGY 



EDITED BY 



E. KAY LANKESTEE 



M.A., LL.D., F.R.S. 



HONORARY FELLOW OF EXETER COLLEGE, OXFORD ; CORRESPONDENT OF THE INSTITUTE 



OF FRANCE ; DIRECTOR OF THE NATURAL HISTORY DEPARTMENTS 



OF THE BRITISH MUSEUM 



PAKT II 



THE PORIFERA AND COELENTERA 



BY 



E. A. MINCHIN, M.A. 



PROFESSOR OF ZOOLOGY IN UNIVERSITY COLLEGE, LONDON 



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



LATE ASSISTANT PROFESSOR OF ZOOLOGY IN UNIVERSITY COLLEGE, LONDON 

 AND 



GILBERT C. BOURNE, M.A 



FELLOW AND TUTOR OF NEW COLLEGE, OXFORD 



WITH AN INTRODUCTION BY 

 E. RAY LANKESTER 



Reprint A. AS HER & CO. Amsterdam 1964 



