Teredinldae at "both locations, it was requested in November 19^ that the 

 panels on the test "boards "be removed and replaced with panels 2 inches 

 thick. This cheinge was made in December at the first location when the 

 lost test "board was replaced "by a new one, and in Brovemter at the second 

 location. However, this change failed to increase the length of life of the 

 panels, as the attack proved to "be proportionately as severe in the 2- inch 

 panels as it had heen in the 1-inch panels originally used. The detailed 

 figures on the occurrence of Teredinldae at each location are summarized 

 ■below. 



a. USKBB-1 (U. S. Naval Air Facility ). Teredlnidae occurred 

 in all of the 11 control panels, the numher In the different panels ranging 

 from 500 to 1,58*^, a maximum length of 52 mm "being recorded. The "breeding 

 season at this location was continuous. Teredinldae euLso occurred in all of 

 the 11 test pajiels, maximum lengths of 75* 190, 210, 250, and 5lf5 una 

 "being, recorded in paJiels su'tamerged for 1, 2, 5> ^* and 5 months, 

 respectively. These panels were well filled in 2 months and riddled after 

 "being su'bmerged for 5 or more months. The attack rated very heavy in "both 

 ISkh and 19^5. 



"b. PSHBiB-2 (U. S. Kaval Operating Facility ). Teredinldae 

 occurred in all of the 11 control panels, the nxnober in different panels 

 ranging from 55 to 660, a maximum length of 55 mm "being recorded. The 

 "breeding season at this location was continuous. In the test panels, 

 Teredlnidae also occurred in all of the 11 panels, with a maximum length 

 of 162 lam recorded after k months' sulmergence. These panels were riddled 

 within k months. The attack rated very heavy in "both 19Mt- and 19*«-5/ "but 

 did not appear to "be as severe as at the other location. 



2. Llmnorla . Llmnorla showed slight evidence of activity at "both 

 locations. At the Air Facility, they occurred on only the last control panel 

 and in the last 5 test panels, the largest ntanber on any panel "being 55 

 forms. At the Operating Facility, Llmnorla did not occur on any of the 

 control panels, and occurred on only 5 test panels, where M»0 tunnels were 

 recorded on one panel in 19M»-, and i|-50 on one of the other 2 panels In 19^5. 

 Thus, the attack at the Air Facility rated none in 19M^ and only a trace In 

 19^5* while the attack at the Operating Facility rated slight in "both years, 



5, Pholadldae . Pholadldae ( Hlata and Martesla ) also were active 

 at "both locations. At the Air Facility, 5 specimens occurred In one 

 of the control panels and in the last 6 of the 11 test panels, the largest 

 number in any panel l)elng 50, The attack was Ijjnlted to 19^5 • At the 

 Operating Facility, no Pholads occurred in the control panels, and they 

 occurred in only k of the 11 test panels, the maximum num'ber in ^uiy one 

 "being 25, Thus, the attack at the Air Facility rated zero in 19W|. and 

 moderate in 19i»-5, while the attack at the Operating Facility rated slight 

 "both years. 



12il- 



