I 609 ] 



XII. 



A EBVISION OF THE BRITISH ACTINIA. PART II.: THE ZOANTHE^. 



By ALFRED C. HADDON, M.A. (Cantab.), M.R.I.A., Professor of Zoology, Royal 

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

 LVIIL, LIX., LX. 



[Eead Februabt 18, 1891.] 

 CONTENTS. 



PAGE 



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 



INTEODUCTION. 



The first part of this Revision dealt with a new sub-family of tlie Sagartidse, 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 Halcampidaj 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 



TRANS. EOT. BUB. SOC, N.S. VOL. IV., PART XII. 4 S 



