Twenty-seven test panels were either filled or riddled, although most of 

 'them had "been submerged for only k months. One of these panels hecame 

 filled within 5 months. The attack was extremely destructive each year, 

 including 194^1-. 



d. TJSM-^ (Fuel Oil Pier ). Teredinidae occurred in 58 of 

 the In control panels, ranging from minute pits or emhryonic specimens 

 to specimens up to 25 mm in length. The surfaces of two of these panels 

 were 50/0 and 755o filled, respectively, hy minute pits made "by "both 

 Teredinidae and Pholadidae . The "breeding season was continuous. The 

 most rapid development of Teredinidae in the control panels at all four 

 locations occurred from the middle of March to the middle of September. 

 T eredinidae also occurred in aJLl k3 test panels, vith a 'maximum length 

 of 180 mm (ahout 7 inches) recorded in one panel auTanerged for 5 months. 

 Twenty-six of the test panels were either filled or riddled, although 

 mogt of them had "been submerged for only k months. One of these panels 

 ■became filled within 2 months. The attack was extremely destructive 

 each year, including 19^^. 



2. Llmnoria . Llmnoria showed more or less activity at all 

 locations; the occurrence is for each location is summarized "below. 



a. IJSHH-1 (Timber Wharf ). Llmnoria occurred on ^k of the 

 kl control panels, although none occiirred up to November 5* 19^^- ^e 

 maximum number on any panel was 66O forma. Llmnoria occurred also on all 

 ■except 3 (including the first 2) of the k8 test panels. The attacks 

 attained peak ratings of medium heavy In 19^5* 19^6, and 19^7. 



b. ll5m-2 (1010 Wharf ). Llmnoria occurred on 37 of the kl 

 control panels, the maximum number of tunnels being 2,000 recorded on 

 any single panel. They occurred on 46 of the k6 test panels. The 

 attacks attained peak ratings of medium heavy in 19^5 and 19**-6 and very 

 heavy in 1947. 



c. USMH-5 (EE Wharf ). Llmnoria occurred on 21 of the kl 

 control panels, although only on k up to July 13, 19k6. The maxijmim 

 number on any one panel was 200 forma . They occurred on 57 of the k8 test 

 pajiels, but were absent on all except on the first panel until April 



9, 1945. The attacks attained peak ratings of alight in. 1914-5 emd 19k6 

 and very heavy in 19^7 • 



d. USm-lj- (Fuel Oil Pier ). Llmnoria occurred on I7 of the 

 1+1 control panels, although none occurred until after March 11, 19k6, 

 The maximum number on any one panel was only 12 forms. Llmnoria occurred 

 on 25 of the 1+8 test panels, also, but occurred on only 2 panels 



up to March 11, 19l»-6. The attacks attained peak ratings of slight In 

 19^5^ 191+6, and 19I+7. 



228 



