23 



ALCYONARIA 



ACTINOZOA. 



ALCYONARIA (OCTACTINIA). 



i. Alcyonium palmatum. Naked eye and hand lens. Coenenchyma; polyps extended; pinnate 

 tentacles of polyps. 



2. Transverse section through a polyp of Alcyonium, at the cesophageal region. Body-wall; 

 oesophageal wall ; ciliated groove of latter ; mesenteries ; mesogloea of oesophagus with spicules ; longi- 

 tudinal muscles of mesenteries. 



3. Transverse section through a polyp of Alcyonium, below the end of the oesophagus. 

 Mesenteric filaments. 



