3. Inverte'brate animal, phyla . 



a. Porlfera (sponf;es ). Four colonies of a sponge were recorded 

 on a single test panel. 



"b. C6elenterata (hydroids ). Hydroids occurred on 27 of the 58 

 control panels and on 39 of the ^5 test panels. They ranged mostly from 

 traces to occasionally light growths on the control panels, and from traces 

 to light or occasionally moderate growths on the test panels. Tuhularia 

 occurred on several.. 



c. Bryozoa (encrusting and filamentous ). Encrusting Bryozoa 

 occurred on 7 of the 38 control panels and on I5 of the h^ test panels. 

 Schizoporella unicornis , Schizoporella sp. , and Waters ipora cucullata 

 were identified. Filamentous Bryozoa occurred on 23 of the 38 control 

 panels and on 27 of the ^5 test panels. Four of the control, panels were 

 from 25^ to 50^ covered, and k of the test panels were from kQfj!} to 80^ 

 covered. Bugula flabellata, B. neritina , and B. sp. were identified. 



d. Annelida (annelid worms ). Serpulid ( SeJrpula ) tutes occurred 

 on 37 of the 38 control panels and on k2 of U5 test panels. On the control 

 panels, 17 were from 25^ to 100^ covered; while on the test panels, 10 were 

 from 20^ to 90^ covered. A maximum length of kO mm was recorded on "both 

 control and test panels after they had heen suhmerged for one month. 



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

 In great ahundance on 33 of the 38 control panels and on kk of the it-5 test 

 panels. Twenty-six control panels and 36 test pemels were from 25^ to 

 100^ covered. Maximum diameters of ik mm were recorded on the control 

 pajiels and of 25 mm on the test panels after k months' sulimergence. 



f. MblluBca (nonhoring mollusks ). Miscellaneous nonborlng 

 mollusks occurred occasionally on the panels as follows: A few specimens 

 of Anomia (jingle-shells) occurred on 2 control panels and on 3 test 

 panels. A trace of Mrbilus (mussels) occurred on 2 test panels. A few 

 specimens of Ostrea (oysters) occurred on 6 test panels. A solitary 

 specimen of Mus cuius occurred on a single test panel. 



g. Chordata (tunicates ). Tunicates occurred on 5 of the 38 

 control panels and on 18 of the ^5 test panels. One of the test panels' 

 was 75^ and another 90^ covered. 



A2i|-.05 SinTTTrmi-y and Conclusions 



1. Installation . A test hoard of the panel type installed September 

 21, 19hk, at the U. S. Naval Air Station at San Juan, Puerto Eico, to 

 determine the identity and prevalence of marine "borers and fouling organisms, 

 is still "being operated. The results of this test have "been summarized to 

 the end of 1957- 



114 



