The attack "by Teredlnldae at this Station was so severe that the 

 use of panels 2 Inches thick was recommei^ed. 



2. Llmnoria . In contrast to the extremely severe attack "by 

 Teredlnldae at this Station, Llmnoria were aljnost completely lacking; 

 only the last one of the control panels was attacked, and this panel 

 contained only k tunnels. 



AI6.04 Fouling Agents 



1. Silt . Silt occurred as traces or light deposits on all 

 the control panels and as light or sometimes heavy deposits on all 

 the test panels. 



2. Invertebrate animal phyla . 



a. Coelenterata (hydrolds and Metrldlum ). Hydrolds occurred 

 as traces on all the control panels, and as traces or light growths on 

 all the test panels except the last one, Tdiere only a small piece was 

 left. Jfetrldlum, a member of a different group of Coelenterata , oc- 

 curred on 2 of the 8 control panels and on k of the 8 test panels, 



h. Bryozoa (encrusting ). Encrusting Bryozoa occurred only 

 on the first k of the 8 test panels that were suhmerged from 2 to 5 months. 

 Electra crustulenta and Electra sp. were Identified. 



c. Arthropoda (crustaceans ). Balanus (hamacles) occurred 

 in great ahundance on all the control panels and on 5 of the 8 test 

 panels. Three of the control panels were 80^, 90^, and 100^ covered, 

 respectively, and k of the teiat panels were congjletely covered. 



77 



