navalis, T. (Lyrodus ) dlegensls ^ T. ( Lyrodus ) sp., and T, ep., were 

 very actlTe each year at both locations. In the control panels, they 

 occurred in all but 2 of the i^0 on Test Board .No. 1; while on Test 

 Board No. 2, they occurred in all except 2 of the 1<-1 panels." The 

 Teredinldae observed ranged from minute pits to embryonic or minute 

 specimens and often occurred in large numbers. It is clearly apparent 

 that the breeding season at this location is continuous throughout the 

 year. 



Teredinidae occurred in all the test panels except in one at 

 each location, and these panels were the first in the i|--panel series 

 which had 'been submerged for only one month each. The destruction by 

 Teredinidae at both these locations was so severe that panels were 

 becoming filled or riddled in 1+ or 5 months; and after the test had run 

 for 5 months, the panels were removed and blocks 5 inches thick were 

 inigtalled. However, the attack still continued to be severe, and on 

 Noveniber 15, 19^5* ilie period of submergence was reduced from 8 to 

 k month's. Even with U -month submergence, many of the panels were more 

 or less filled by the tunnels of Teredinidae , particularly in the panels on 

 Test Boaird No. 1. The attack rated very heavy each year at both locations. 



2. Llmnorla . Llmnorla were relatively active at both locations 

 throughout the period covered by the tests, although never occurring 

 In destructive numbers. In the control panels, they occurred In 3 of 

 the 1+0 on Test Board No. 1, and these panels had only 2, 2, and 6 

 tunnels, respectively. On Test Board No. 2, they occurred In l8 of the 

 kl panels, 50 tunnels being the maximum number in any one panel; none 

 occurred prior to June 15, 19*^-5 • 



Llmnorla occurred In every test panel of Test Board No. 1 

 submerged after Tebruary ill-, 19^6, but_cji4y h tvmnels occurred In any 

 of the panels subaerged prior to that, date,. In the test panels of 

 Test Board No. 2, Limnoria were more plentiful, occurring In 58 of the 

 60, but only in two panels during 19hh. On Test Board No. 1, the 

 Limnoria attack never rated more than a trace in any year; while on 

 !Ifest Board No. 2, it rated only a trace most of the time, but attained 

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

 last test panel in 19l<-7. 



a1<-3.0U Fouling Agents 



1. Silt . Silt occurred on all the panels of both test boards, 

 the deposits ranging from traces to light, or rarely moderate, on the 

 panels of the control series and generally from traces to moderate on 

 those of the test series. The deposits on a number of panels at both 

 locations were oily. 



195 



