PLATE XII. Fig. 22. A ridge or low elevation in the ectoderm of the 

 tentacle containing cnidocytes (C) apparently embedded in the cytoplasm 

 of an epithelio-muscular cell (EP). A thin mesogleal layer (arrow) separates 

 the ectodermal cells from the attenuated, highly vacuolated endoderm (EN). 



Fig. 23. An extracellular space containing granules and enclosed by the 

 cell membranes of four endoderm cells, yielding a star-shaped effect. 



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