"b. Coelenterata (bydroids ). Hydro! ds occurred wi tit great 

 frequency on the test "boards at all four locations. At the WaT^f Yard 

 they occurred on 2k of the k3 control panels^ and on all except one of 

 k^ test panels. At Pier Ho. 7 at the Efaval Drydock, they occurred on 51 

 of the k3 control panels and on all k3 of the test panels. At the Lock- 

 wood Basin^ they occurred on 22 of the kl control panels eoid. cai all except 

 2 of the sajn© number of test panels. At the East Jetty at the Haval Dry- 

 docks, there were hydroids on 15 of the 20 control panels and on all 20 

 of the test panels. The growths generally ranged from traces to light on 

 the panels of the control series and from traces to moderate on panels of 

 the test series. Tuhularia occurred with great frequency. 



c. Bryozoa (encrusting and filamentous ). A single colony of 

 Electra crustulenta was recorded on each of 2 of the control panels at 

 Pier No. 7 at the Waval Drydocks. Filamentous Bryozoa were recorded en 

 2 control panels at the Lockwood Basin, and on a single control panel 

 and 5 of the test panels at the East Jetty at the Bfaval Drydocks. They 

 ranged in numbers from traces to several colonies. 



d. Arthropoda (crustaceans ). Balanus ("barnacles) occrcrred with 

 great frequency on the panels of the test "boards at all four locations. At 

 the Navy Yard, they occurred en 8 of the k^ control panels and on 56' of 

 the k3 test panels. At Pier No. 7 of. the Naval Drydocks, they occurred en 

 15 of the k3 control panels and on 55 of the same nuniber of test panels. 



At the Lockwood Basin, they occurred on 1^*- of the 4l control panels w.nfl 

 on 56 of the kl test panels. At the East Jetty at the Naval Drydocks, they 

 occurred on 9 of the 20 control panels and on 17 of the same number of test 

 panels. The "baamacles occurred most ahundantly at the Lockwood Basin, 

 where 15 of the panels were from 50?^ to 100^ covered, and at the East Jetty 

 at the Naval Drydocks, where 10 of the test panels were from 50^ to 100?^ 

 covered, after 8 months* su'bmergence. Maximum diameters of 7, 7, 10, and 



7 mm were recorded on the control panels, and of ik, 12, 11, and 15 mm, 

 respectively, on the test panels at the Navy Yard, Pier No. 7 at the Naval 

 Drydocks, Lockwood Basin, and East Jetty at the Naval Drydocks. Anrphipods 

 (nearly all Corophium ) occurred sporadically on the panels of the test 

 boards at all four locations. At the Navy Yard, they occurred on 7 control 

 panels and on 11 test panels. At Pier No. 7 at the Naval Drydocks, they 

 occurred on h control panels and on 15 test panels. At the Lockwood Basin, 

 they occurred on a single control panel and on l**- of the test panels. At 

 the East Jetty at the Naval Drydocks, they occurred on a single control 

 panel and on 2 test panels. 



e. Mollusca (non"boring mollusks ). %tilus (mussels) occurred 

 more or less a'bundantly on the panels of the test "boards at all four loca- 

 tions. At the Navy Y^d, they occurred on a single control panel and on 



8 test panels. At Pier No. 7 at the Naval Drydocks, there were mussels on 

 10 of the test panels. At the Lockwood Basin, they occurred on 5 control 



kh 



