ALCYONARIA. 



167 



Examples : 



Antipathes (arborescent). Cirripathes 

 (whip-like). Leiopathes (with twelve mes- 

 enteries). Dendrobrachia (with eight pinnate 

 retractile tentacles). 



ALCYONARIA 



In the Alcyonarian polyp there are 

 eight tentacles, almost always pinnate, 

 and eight mesenteries attached to the 

 stomodseum. In Bourne's Acrossota the 

 tentacles have no pinnules. There is 



r. 



FIG. 84. Diagrams of Types of Alcyonaria. After Hickson. 



Types of Alcyonaria : I. Of Stolonifera ; II. of Alcyonacea ; III. of Axifera; 

 IV. of Stelechotokea. 



one longitudinal ciliated groove (siphonoglyphe or suicus) in 



