(a) 



( 



^** 'i Kb) 



Fig. 11.3. Sections through Various Regions of the Body of the Plumose 

 Anemone Metridium senile, Showing the Localization of Pigments 

 In (a) transverse bands of uric acid granules are shown as solid black in three tentacles ; 



(b) is a transverse section of the body wall of a red Metridium showing the base of a 

 mesentery. The ectoderm {left) contains nematocysts and red carotenoid fat droplets 

 at the base of the cells. In the endoderm the red fat droplets are more evenly distributed ; 



(c) is a transverse section of the stomodaeal wall of a red Metridium showing red fat 

 droplets in the endoderm. Red droplets are aggregated at the base of the stomodaeal 

 ridges opposite the insertion of the mesenteries. (From Fox and Pantin (22).) 



Fig. 1 1 .4. A Nudibranch Janolus cristatus {Antiopa chstata) 

 from British Shores 



The white tips of the branchial papillae contain guanine particles, according to 

 Cunningham and MacMunn. 



