I 609 J 



XII. 



A EEYISION OF THE BRITISH ACTINIiE. PAET II.: THE ZOANTHE^. 

 By ALFEED C. HADDON, M.A. (Cantab.), M.E.I.A., Professor of Zoology, Eoyal 

 College of Science, Dublin; and MISS ALICE M. SHAOKLETON, B.A. Plates 

 LVIII., LIX., LX. 



[Read rEBEUAEX 18, 1891.] 

 CONTENTS. 



PAOE 



Introduction, ........... 609 



General account of the Anatomy of the Zoanthese, . . . .612 



Classification of the Group, . . ...... 626 



Systematic Account of the British Zoanthese, ..... 634 



Bibliography, 663 



Index, 671 



INTRODUCTION. 



The first part of this Revision dealt with a new sub-family of the Sagartidae, the 

 Chondractininse, which included the genera Chondractinia, Hormathia, Chito- 

 nactis, Actinauge, and Paraphellia. A few notes were made on the genus Sagartia ; 

 and details are given of British representatives of Gephyra dohrnii. The British 

 members of the families Edwardsidse and Halcampidai were described ; and the 

 nature of Gonactinia proUfera was discussed. An account was also given of the 

 arrangement of the mesenteries in the Zoanthese. The Paper concluded with a 

 summary of the development of the mesenteries of Actinia ; and certain general 

 considerations were advanced on the phylogenetic value of the mesenteries. 

 Unavoidable circumstances caused this first part of the Revision to be heteroge- 

 neous in character, and unsatisfactory in many details. 



The present instalment of the Revision is confined to a very distinct group of 

 the Actiniae. Although there has been considerable confusion within the group, the 



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