of Mytllus (mussels) occiirred on i|^ of the control panels of Ifeet Boaird 

 No. 1 and on a single control panel and on 5 of the test panels of Test 

 Board No. 2. A trace of Anomla (jingle -shells) occtirred on h of the test 

 panels of Test Board No. 2. A few Juvenile specimens of Pecten (scallops) 

 occtjrred on 2 of the test panels of Test Board No. 1, 



f . Chordata (tunicates) . A few colonies of timicates were 

 recorded on the first panels in both the control and test series of Test 

 Board No. 1 and on a single control panel and two of the test panels in- 

 Ibst Board No. 2, Botryllus schlosserl was 'the only fomi identified. 



A^5.05 Summary and Conclusions 



1. Installation . Two test boards of the panel type installed at 

 the U. S. Naval Station at Port Hueneme, California, on June I5, 19^i^, are 

 still being operated. The results of these tests have been summarized to 

 the end of 19^1. 



2. Test Eesults . 



a. Borers . Teredlnidae were very active at both locations, 

 and it is clearly apparent that the breeding season is continuous throu^- 

 out the year. The destruction by Teredlnidae was so severe at both 

 locations that ai"ter the tests had run 5 months, thicker test panels 



were used, and the period of submergence was reduced from 8 to ^l- months. 

 The attack rated very heavy each year at both locations, particularly 

 so on Test Board No, 1. Limnoria were more or less active at both loca- 

 tions throughout the period covered by the tests. The attack never 

 rated more than a trace in any year on Test Board No. 1, while on 

 Test Board No. 2, it fated only a trace most of the time, but attained 

 a peak rating of moderate late in 19^5 and a rating of slight in the 

 last test panel removed in 19^7. 



b. Fouling Organisms . Silt, algae, and invertebrate 

 animals belonging to 6 phyla contributed to fouling of the panels. 



The phyla included hydroids, encrusting and filamentous Bryozoa, serpulld 

 worms, barnacles and amphlpods, miscellaneous nonboring mollusks, and 

 tunicates. Of these organisms, hydroids, encrusting and filamentouB 

 Bryozoa, and calcareous worm tubes occurred with the greatest frequency, 

 while the occurrence of the others, as well as of the algae, was purely 

 sporadic . 



5. Be cent Addenda . At Test Board No. 1, there was a very heavy 

 attack by Teredlnidae in both 19^18 and 19^9. The attack by Limnoria 

 at this location was slight in each of those years. Ibredlnidae were 

 also very heavy on the panels of Test Board No. 2 in both years, while 



197 



