PLATE XIII. Fig. 24. Cnidocytes in the tentacle embedded in the cyto- 

 plasm of epithelio-muscular cells (EP). The cnidocytes are not syncytial, but 

 are enclosed individually in their limiting membranes. One of the cnidocytes 

 has muscle filaments (M). S is the surface of the animal. Near S, a cnidocil 

 is seen. 



Fig. 25. An extracellular space containing granules and enclosed by the 

 membranes of endoderm cells and yielding a star-shaped effect. 



32 



