5. Pholadldae . Pholadldae ( Hlata and Jfaxtesia) shoved more or 

 less activity at all four locations. However, it was difficult to 

 evaluate the severity of the attack "because the panels were frequently 

 riddled "by Teredini dae and also more or less severely attacked "by 

 Limnoria in some cases. The occurrence of Pholade is summarized "below 

 for each location. 



a. USHH-1 (Timber Wharf ). Pholadldae occurred on 7 of the 

 kl control panels, the TnaxlTnma nutober "being 60 on any one panel. They 

 occurred in 21 of the k8 test panels. Of 7 consecutive test panels 

 in 19^5* three were 20^, 50^, and 50^ filled, respectively, the fourth 

 was filled, the fifth and sixth were well filled, and the seventh was 

 riddled. One panel hecame well filled in 5 months. Sizes were rarely 

 recorded. The attacks rated very heavy in 19^5, moderate in 19^6, and 

 none in 19it-7. 



t, I]ISm-2 <1010 Wharf ). Pholadldae occurred on 12 of the ^l^l 

 control panels, the maxlaium num"ber on any one "being 8 per sq in. 

 (1,056). They occurred in 55 of the k8 test panels also. Three of 

 the test panels were 25?^, 50^> ^d 80^ filled, respectively, and three 

 were well filled. One "became well filled in 5 months. Specimens up 

 to 50 mm long were recorded. The attacks rated very heavy in 19^5 

 and 19h6 and slight in 19^7. 



c. PSim-5 (EE Wharf ). Pholadldae occurred in 7 of the 

 kl control panels, one "being 14-05& filled with juvenile specimens of 

 "both Teredini dae eind Pholadldae . Pholadldae also occurred in 55 of 

 the h& test panels. Two of the 6 test panels were 25^ filled, two 

 were 75^ filled, and two were well filled. One test panel was well 

 filled within 5 months. Specimens up to kO mm long were recorded. 

 The attacks rated very heavy in 19Mt- and 19k6 and heavy in 19^5 and 

 191^7. 



d. USnH-4 (Fuel Oil Pier ). Pholadldae occurred in 12 

 of the in control panels, the sxu^aces of 2 panels "being 50^ and 75?^ 

 filled, respectively, with pits caused "by "both Teredini dae and Pholadldae . 

 Pholadldae also occvirred in 56 of the k8 test pemels. Five of the 11 

 test panels were 10^, 20^, 25/^, 55^, and 50^ filled/ respectively) two 

 were filled; three were well filled; and one was riddled. One of these 

 panels was filled within 2 months. Specimens up to ij-5 mni long were 

 recorded. The attacks rated very heavy in l^kk and 19i<-5 and medium 

 heavy in 19l|-6 and 19^7. 



Al)-8.0i|- Fouling Agents 



1. Silt . Silt occurred on all the panels, "both control and 



229 



