CONTRIBUTIONS ON THE MORPHOLOGY OF THE 

 ACTINOZOA. 



III. THE PHYLOGENY OF THE ACTINOZOA. 

 J. PLAYFAIR McMURRICH. 



CONTENTS. 



PAGE 



I. Edwardsise 126 



II. Hexactinkv ... 127 



Order of succession of primary mesenteries 127 



Relation of longitudinal muscles to siphonoglyphe 129 



Successive appearance of secondary mesenteries 133 



III. Paractinire 1 38 



IV. Zoanthece 140 



V. Cerianthece . .- . , 147 



VI. Phylogeny of the Actinozoa 149 



Actiniaria 150 



Madreporaria 155 



Rugosa 157 



Alcyonaria 157 



Antipatharia 159 



A discussion of the phylogeny of the Actinozoa may seem 

 superfluous after the admirable paper by Boveri ('90) which has 

 appeared so recently. Prior to its publication I had accumulated 

 a considerable number of facts bearing upon the questions dis- 

 cussed in it, and, before it reached me, had written several pages 

 of a paper whose purpose was to set forth my deductions from 

 these facts. This paper seemed, however, unnecessary, since 

 many of Boveri's conclusions coincided with my own, and it 

 was destroyed. In regard to certain points, however, I was not 

 in perfect harmony with Boveri, and having had the opportunity 

 since the publication of this paper of studying some forms, very 

 interesting from a phylogenetic standpoint, I have determined 



125 



