Schlzoporella unicornis , and Schlzoporella sp. aleo were identified. 

 Filamentous Bryozoa also occurred rather abundantly, "being recorded on 

 9 of the k-2 panels in the control series emd on hk of the k9 in the test 

 series. Three of the test panels were 25^, 50'5b, and 85^ covered, re- 

 spectively, after having "been suhmerged for 4 to 6 months. B^^gula 

 flahellata and Bugula sp. were the only forms identified. 



c'. Annelida (marine worms) . Serpulid (Serpula) tuhes occurred 

 on 11 of the k2 control panels and on 26 of the h9 test panels. Foui' 

 consecutive test panels suhmerged for 4-month periods at monthly 

 intervals "beginning July 15, 19h6, were 75^, 75^, 30%, and 45^ covered, 

 respectively. Maximum lengths of 25 smi vere recorded on the control 

 panels and h'^ mm on the test panels after 7 months' submergence. 



d. Arthropoda (crustaceans) . Balanus ("barnacles) occmrred 

 in small numbers on 6 of the k2 control panels and on 39 of the k9 test 

 panels. Maximum diameters of 6 mm were recorded on the control panels 

 and 25 mm on the test panels eufter 8 months' submergence. The maximum 

 number recorded on any test panel was only 30 barnacles. An5>hipods 

 (nearly all Corophium ) occurred on 5 control panels and on 2 test panels. 



e. Mollusca (non'boring aollusks) . Miscellaneous non"borlng 

 mollusks occurred on the panels as follows: Mytllus (mussels) occurred 

 on 5 of the k2 control panels and on 22 of the h9 test panels. Maximum 

 lengths of ik ram were recorded on the control panels and 57 mni on a 

 test panel after k months' submergence. A few specimens of Modiolus 

 (horse mussels) occurred on 3 of the test panels. A few specimens 3 



of Pecten (scallops) occurred on I6 of the test panels Traces of 

 Anomla (jingle-shells) occtorred on k of the test panels. Several 

 specimens of Saxicava occurred on 5 of the test panels. 



f . Chord ata (tunicates) . Tunicates occurred on 9 test 

 panels. Ciona occurred a number of times an d Malgula also was recorded. 



A41t-.05 S^TmnHvy and Conclusions 



1. Installation . A test board of the panel type installed 

 at the Terminal Island Naval Shipyard at Sen Pedro, California, on 

 June ik, 19^4; is still being operated. The results of this test have 

 been summarized to the end of 19^7. 



2. Test Results . 



a. Borers . Teredinidae were very active at this location, 

 infesting panels in every calendar month of the year, thus indicating 

 that the breeding season is continuous. The attack, which was so 

 destructive that the period of submergence for the panels was reduced 



205 



