in May aad June of 19^6, vhen It vas estimated that 12,000 taimalB 

 occtirred In panels that had heen subnerged for ^ and 6 months , reBpectlTel7. 

 After this tine, the Llnmorla population diminished irapldly and then 

 Increased again, xintll l4-,600 tunnels vere recorded In the panel removed 

 on December 20, 19^*^6, and ^,300 In the one panel remored on January 19, l^^i-T. 

 Eoweyer, the period of submergence of these 2 panels was not known because 

 of failure to remove them In the proper order. It Is plainly apparent 

 from this brief test that the Llmnorla attack at this location vas extremely 

 severe in 19^6. 



3* Pholadldae . No fholadidae vere recorded at this location. 

 Al^9.0i^ Fouling Agents 



1. Silt . Silt occurred as traces or light deposits on «n 

 the panels, both control and test. 



2. Invertebrate animal phyla . 



.a. Coelenterata (hydroids ). Eydrolds occurred as traces 

 or light growths on 6, of the 12 control panels and on 10 of the 1^ test 

 panels. None vas identified. 



b. Bryozoa (enc3ruatinfi and filamentous ). Encrusting Bryozoa 

 occurred more or less abtuadantly on 6 of the 12 control panels and on 



11 of the Ik test panels. The identity of these Bryozoa was not determined. 

 Filamentous Bryozoa occurred more or less abundantly on 7 of the 12 

 control panels and on 10 of the l^l- test panels. Bugula neritlna was 

 the only form identified. 



c. Annelida (marine vorms ). Serpulid ( Serpula ) tubes 

 occurred, often in considerable numbers, on 3 of the 12 control panels 

 and on 10 of the Ik test panels. The first of the test panels had an 

 average of 35-40 tubes per sq. in. (5,280). 



d. MolluBca (mollusks ). A trace of Anamia (jingle-shells) 

 occurred on a single control peinel and on 2 of the test panels. 



Ai|-9 • 05 Sufflmary and Conclusions 



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

 at the U. S. Naval Air Station on Palmyra Islemd, Territory of Hawaii, 

 from December 20, 19^5 until its discontinuance on January 19, 19U7, 

 to determine the identity and prevalence of marine borws and fouling 

 organisms at this location. 



235 



