Plate V. 



Various Animal Fouling Organisms. 



Fig. 21.—" Acorn barnacles," showing the compressed forms found m crowded colonies. 



Fig. 22.— The " goose barnacle." Fig. 23.— Patches of an encrusting Polyzoan, showmg how 



it may grow over the shell of a dead barnacle. The structure is honeycomb-hke. Fig. 24. — 



Barnacle bases, sho^ving the type of markings which distinguish them from Polyzoa patches. 

 Fig. 25.— Various sea-squirts, showing two different forms of single animals and a colonial form. 

 Fig. 26.— Sponges, showing {left) a colony of single individuals, and {right) a colonial " encrust- 

 ing " sponge. Fig. 27. — A sea-anemone in its contrac sd form as seen out of water. 



lFoiiU>ig of Ships. 



