the test. The attack rated from a trace to alight most of the time "but 

 attained a rating of moderate late in 19^5. 



"b. Fouling Organisms , Silt and Invertehrate animals 

 Taelooging to 6 phyla contributed to the fouling of the panels. The 

 latter comprised hydroids, encrusting and filamentous Bryozoa, marine 

 votAb, l:>amacles and an^hipods, miscellaneous nonboring mollusks, and 

 tunlcates. Of these organisms, the hydroids and hamacles occuri!>ed 

 with great freq.uency and regularity, while the occurrence of the others 

 was more or less sporadic. 



3. Recent Addenda . On the lower hoard at Pier 517-C, there was 

 a moderate attack "by Teredinidae in 19h& "but only a trace In 19k9. No 

 Limnoria were present either year. No horers of either kind were 

 recorded during these years on the upper "board at this pier. 



The Teredinidae attack was very heavy in 19^8 and 19^9 on 

 the lower hoard at the Deperming Station, hut no Limnoria at all were 

 recorded here either year. On the upper hoard at this location there 

 was a moderate attack hy Teredinidae each year, hut again no Limnoria 

 at all. 



At the Custom House Pier the attack hy Teredinidae was very 

 heavy in hoth 19^8 and 19^9. There was a trace of L^^rmoria present 

 each year also. 



75 



