2. Algae. Algae, mostly green, occurred on 2 control panels j^ 

 and on one test panel of Test Board No. 1 and on a single control panel; - 

 of Test Board Wo. 2, the growths rating aa a trace or light. — 



3. Inverte h rate ajiimal phyla . 



a. Coelenterata (hydroids) . Hydroids occurred on 15 of 



tlie ifO control panels and on 59 of the 56 test panels of Test Board : 



No, 1; on Test Board No. 2 they occurred on 1? of the i)-l control 



panels and on h2 of the 56 test panels. The growths rated as traces 



on the panels of the control series and, in general, as traces to light • 



on the panels of the test series. Tubular-ia occurred frequently. 



b. Bryozoa (encrusting and filamentous ). Encrusting Bryozoa 

 occurred more or less abundantly on 11 of the UO control panels and on 



ij-9 of the 56 test panels of Test Board No. 1; on Test Board, No. 2 they 

 occurred on 9 of the 1<-1 control panels and on ij-0 of the k^ Test panels. 

 On the test panels, 9 of the Test Board No. 1 and 15 of Test Board 

 No. 2 were from 50fo to Sof covered. Crypt osula pallasiana , Holoporella 

 brunnea , Lichenopora sp., Schizoporella unicornis , and Tsgella sp. 

 were identified. Filamentous Bryozoa occurred more or less abundantly 

 on 7 of the Uo control panels and on 26 of the 56 test panels of Test 

 Board No. 1; on Test Board No. 2 they occurred on 11 of the i|-l control 

 panels and on 52 of the 56 test panels. Bugula flabellata , B. neritina , 

 B. sp. were identified. 



c. Annelida (annelid worms) . Calcareous worm tubes occurred 

 on 25 of the 56 test panels of Test Board No. 1 and on a single control 

 panel and 5U of the 56 test panels of Test Board No. 2, On Test Board 

 Wo. 1, the maximum number on any one test panel was 55 a^cl the maximum 

 diameter recorded was UO mm after h months' submergence. On Test 



Board No. 2, the maximum number on any one test panel was I50, and the 

 maximum diameter recorded was 50 mm after h months ' submergence . Both 

 Serpula and Spirorbia occurred. 



d. Arthropoda (crustaceans ) . Balanus (barnacles) occurred' 

 in small numbers and infrequently on the panels at both locations. They 

 were recorded on 5 of the test panels of Tfest Board No. 1 and on a 

 single control panel and I5 of the 56 test panels of Test Board No. 2, 

 On this test board, a vaaxlmvtm diameter of 6 mm was recorded on a single 

 control panel and 12 mm on the test panels after h months' submergence. 

 Amphipods (nearly all Corophium ) occurred on 2 of the control panels 

 and on a single test panel of Test Board No. 1, while on Test Board 



No. 2, they occurred on only a single control panel. In no case was • 

 their number particularly large. 



e. Mollusca (nonboring mollusks ). Miscellaneous mollusks 

 occurred occasionally at both locations as follows: A few small specimens 



196 



