Plate VIII. 



Photomicrographs of Seaweeds and Polyzoa. 



Fig. 42. — The red seaweed Ceramium, showing the 

 characteristic banded appearance and pincer- 

 like endings. X 15. 



Fig. 43. — The red seaweed Polysipkonia, showing 

 the tiers of cells. X 30. 



Fig. 44. — A branching Polyzoan. X 



Fig. 45.— The same organism as in Fig. 44, showing the 

 typical honeycomb structure of the Polyzoan. X 4. 



[Fouling of Ships 

 [To face p. '.K 



