Plate XI. 

 Diagrams illustrative of structure of Sea Anemones. 



1. Section through Actinia (after Green). 



2. Septum of 8. parasitica (A. Rondeletii) (after Hert- 



wig). 



3. Diagram showing arrangement of septa in base of 



A. equina (mesembryanthemum), from Journal of 

 Queckett Club, vol. v., plate xi. 



4. Section through tentacle of Anemonia sulcata {A. 



cereus) (after Hertwig). 



5. Thread-cells or nematocysts (after Hertwig). 



For descriptions of these figures, see chapter on 

 Anemone Structure, pp. 136—145. 



