test series, the deposits mostly rating light on the panels of the 

 control series and moderate on the panels of the test series. 



2. Invertetrate an1mn.1. phyla . 



a. Coelenterata (hydroids ). Hydi'oids occiirred on all the panels 

 of "both the control and test series, the growths rating as traces on the 

 controls stnd light on all panels of the test series after the first month. 



"b. Bryozoa (encnisting eind filamentous ). Encrusting Pryozoa 

 were found on the first one of the control panels and on all except the last 

 one of the test panels. They rated from a few to numerous colonies on the 

 panels on which they occurred. In all cases, they were identified as 

 Cryptosula palLasiana . Fllamentoiis Bryozoa occurred on 2 of the 5 control 

 panels and on all 5 test panels, rangiiig from a few to numerous, Bugula 

 flaljellata and B. neritina were identified. 



c. Annelida (annelid worms ). Serpulid ( Serpula ) tulies were 

 numerotis on each of the first k control panels and on k- of the 5 test panels. 



d. Arthropoda (crustaceans ). Balaaus (tamacles) occuired on 

 the first 5 of the 5 control panels and on all 5 test panels. One of the 

 control panels and all of the test panels were covered except the last one, 

 which was 90^ covered. Maximum diameters of 10 mm. were recorded on the 

 control panels and 15 mm on 2 of the test panels after they had "been 

 submerged for h and 5 months, respectively. 



e. Chorda ta (tunicates ). Tunica tes occurred on a single control 

 panel and on 2 of the 5 test panels. Only a few colonies were recorded on 



2 of these panels, but from 60 to 70 specimens were recorded on the last 

 of the test panels removed in November, after 5 months* submergence. 



A29.O5 Sxmmary and Conclusions 



1, Installation . A test board of the panel type was operated at the 

 U. S. Advanced Amphibious Training Base at Bizerte, Tunisia, from June 19* 

 19kk until its discontinuance after November 20, 19kk, to determine the 

 identity and prevalence of marine borers and fouling organisms occurring 



at this location. 



2. Test Results. 



a. Borers . Teredinidae occurred irregularly and caused only a 

 slight attack on the panels. Limnoria were active throughout the period 

 covered by the tests, ajid the population was increasing rapidly when the 

 test was discontinued. The severity of the attack was considered as low in 

 the moderate rating, but xindoubtedly would have been higher had the test 

 been continued longer. 



152 



