active throughout th.e period covered "by the test, but never occurred in 

 particularly destructive ntiinbers. Their occurrence vas irregular and 

 sporadic. The attack rated from zero to a trace njost of the time, 

 but it did attain a low moderate peak in 19^5 > and rated slight in 

 19^7. Pholadidae, also, vere more or. less active throughout much of 

 the period covered by the test, and their occurrence also was irregular 

 and sporadic. Their attack vas difficult to evaluate because of the 

 rapid and often conjilete destruction of the panels by Teredinidae . 

 but appears to have rated medium heavy in 19^^ and 19^7> and moderate 

 in 191^5 and 19^6. 



b. Fouling Organisms . Silt and invertebrate animals 

 belonging to 5 phyla contributed to fouling of the panels. The 

 latter con5)ri8ed hydrolds, encrusting and filamentous Bryozoa, seiT)ulld 

 worms, barnacles, and miscellaneous nonboring mollusks. Of these 

 organisms, barnacles occurred with the greatest frequency anfl abundance, 

 Hydrolds also occurred most frequently, encrusting Bryozoa occurred 

 less frequently, and filamentous Bryozoa and serpulid worms occuired 

 much less frequently, while the occurrence of the other worms was merely 

 occasional. 



3. Becent Addenda . Panels removed from the board at this station 

 in 19^8 and 19^9 » were riddled with Teredinidae . Llmnorla reached the 

 low moderate rating in 19^8 and attained a rating of medium heavy the 

 following year. 



8k 



