2. Test Eeaulta . 



a. Borers, Both Teredo navalls and Llmnorla occurred to a 

 limited extent, the occurrence of both helng virtually restricted to the 

 period from the middle of May through July. The attack hy Teredo navalis 

 rated very slight in I9U5, and no attacks were reported during the early 

 peirt of 19^4-6. The attack "by Llmnoria rated only a trace. 



h. Fouling Organisms . Silt, green algae, and invertehrate 

 animals "belonging to 5 phyla contrlhuted to fouling of the panels. The 

 invertebrates comprised hydroids, encrusting Bryozoa, serpulid worms, 

 barnacles and amphipods, and mussels. The green algae occurred with by 

 far the greatest frequency of any fouling organisms. Of the invertebrate 

 animals, hydroids occurred most frequently and barnacles in lesser numbers, 

 while the occurrence of the other organisms was merely occasional. 



60 



