2. Llmnorla . Llmnorla were active In all the panels throughout 

 the period of the test, and the attaclc rapidly ■became destructive. In 

 the last control panel submerged for leas than a month (from August 10 

 to September 2), the attack rated slightly ahove moderate. In the test 

 panels, the Llmnoria population rose rapidly, attaining a rating of 

 heavy in a panel removed August 10 after having "been submerged for 6 months, 

 although somewhat lower in the last panel. 



5» Pholadidae . No Pholadidae were recorded at this location. 



A52.0ll- Fouling Agents 



1, Silt . Silt occurred on all the panels, "both control and 

 test, ranging from traces to lig^t deposits. 



2. Invertebrate anlmfl.! phyla . 



a. Coelenterata (hydroids ). Hydroids occurred on all the 

 panels, both control and test, ranging from traces to light deposits. 

 Tubular ia was the only form identified. 



b. Bryozoa (encrusting ). Encrusting Bryozoa occurred 

 on 3 of "til© 5 control panels and on k of the 6 test panels. They 

 were mostly few in number. ELectra monostachys was determined in 

 one case. 



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

 occurred on one of the control panels and on k of the test panels. 

 They were few in number in 2 of the latter, but the other 2 test panels 

 contained 50 to 65 tubes, respectively. 



d. Arthropoda (crustaceans ). Balanus (barnacles) oociirred 

 on the first 5 coatrol panels and on the first k test panels, 



the greatest number on any single panel being 25 barnacles. On the control 

 panels, the maximum diameter of the specimens was 10 mm., and on the 

 test panels, the maximum was 15 3imi on one panel exposed for k months. 



e. Mollusca (nonboring mollusks ). A dozen Juv^iile speci- 

 mens of Ltrfcilus (mussels) occvirred on a single control panel. 



A52.O5 Summary and Conclusions 



1. Install ation . A test board of the panel type was operated 

 at an unidentified Naval Base on Manus Island, Admiralty Islands, from 

 February 10 until its discontinuance after October 2, 19^6. 



2kh 



