ranged from traces to moderate on "both the control and test panels; 

 while on Test Board No. 2, they ranged from traces to light on panels . 

 of both series. 



2. Algae . Traces of green and "brown algae occvirred on a single 

 test panel of Test Board No. 1. 



3- Inverte"brate animal phyla . 



a. Porifera Csponpces ). A few sponges were recorded on 

 5 test panels on Test Board Ho. 1 and on a single test panel on 

 Test Board Wo. 2. A single specimen of an encrusting sponge occurred 

 on one control panel of the latter test toard. 



Tj. Coelenterata (hydroids ). ^ydroids occurred on 58 of 

 the hk control panels and on all except one of the 50 test panels on 

 Test Board No. 1. On Test Board No. 2, they occurred on all 18 control 

 panels and on all of the 25 test panels, except the last panel in each 

 series, the uncontaminated one having been removed eufter only 5 days' 

 submergence. Tubularia was the only form identified. 



c. Bryozoa (encrusting and filamentous ). Encrusting 

 Bryozoa were more or less abundant on the panels of both test boards. 

 On Test Board No. 1, they occurred on 56 of the k^ control panels and on 

 53 of the 50 test panels. Four control panels were from 50^ to 100^ 

 covered. On Test Board No. 2, they occurred on ik of the 18 control 

 panels received and on 1? of the 25 test panels. Electra crustulenta . 

 E. monostachys . E. sp., Aoanthodesia serrata , Cryptosula pallasiana , 

 Cryptosula sp. , Schizoporella sp. , and Gemelliporidra typica were 

 identified. Filamentous Bryozoa also were relatively abundant on the 

 panels of both test boards. On Test Board Nd. 1, they occurred on 32 

 of the ij-5 control panels and on kl of the 50 test panels. Five each 

 of the control and test panels were from 50^ to 75^ covered. On Test 

 Board No. 2, they occurred on 12 of the 18 control panels received, 

 and on 18 of the 25 test panels. Bugula flabellata . B. neritlna , and 

 B. sp. were identified. 



^« Braohlopoda (brachiopods ) . A few brachiopods occurred 

 on a single control panel and on 2 test panels of Test Board No. 1, 

 also on two each of the control and test panels of Test Board No. 2. 



e. Annelida (marine worms ). Serpulid ( Serpula ) tubes 

 occurred more or less abundantly on the panels of both test boards. 

 On Test Board No. 1, they occurred on 8 of the ^3 control panels and on 

 21 of the 50 teat panels. The maximum length was I5 mm on the control 

 panels and 70 mm on the test panels. The maximum number on aziy one 

 of the latter was 60 worms. On Test Boeird No. 2, they occurred on 3 



216 



