July 19Mt there was a rapid increase in the numher of Teredinidae , 

 and the attack soon attained a peak rating which was maintained until 

 the loss of the test toard during a storm in August 19'<-5. During 

 this period, eill the panels that were suhmerg^ed for 5 or more months 

 were more or less riddled, and the last one was one-third destroyed. 

 The attack in panels that were suTmerged suhseq.uently appeared less 

 severe, although none of these psinels were left submerged longer than 

 k months. The next to the last pajxel of this series w^s well filled 

 with specimens up to 95 mm in length after ^l- months' sulsmergence. 

 It is appeirent that the attack \>j Teredinidae rated very heavy. 



2. Limnoria . Throughout the period of the test Limnoria 

 were active, "but only occurred in small numbers. In 15 of the 18 

 control panels, 70 Limnoria was the largest numher found on any panel. 

 Limnoria occurred in l4 of the 19 test panels, 200 forms "being the 

 largest number found in any of these panels. The attack was low in the 

 slight rating in 1945 and only a trace in 19i|-6. 



5. Pholadidae . Only 2 Pholadidae were recorded on the 

 test panels that was submerged for a single month, and the genus was 

 not identified. 



A20.014- Fouling Agents 



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

 test, the deposits ranging from traces to light on the control, and 

 from tr.aces to light or occasionally moderate on the test panels. 



2. Algae . Traces of green algae occurred only on the first 

 2 of the test pajiels and the accompanying controls. 



5. Invertehrate anlTtw.l phyla . 



a. Coelenterata (hydroids ). Hydro ids occurred as traces 

 to occasionally light growths throughout the period covered hy the 

 test, on all the panels, toth test and control, except for a single 

 best panel. Tuhularia was the only form identified. 



■fa. Brjozoa (encrusting ). Encrusting Bryozoa occurred on 

 the first 5 and the last 5 control panels, and on 13 of the 

 19 test panels. They occurred regularly on the first 7 test 

 panels submerged on July 21, 19^4* and removed after from one to 

 7 months, respectively, "but their suhaequent occurrence was very 

 sporadic. While, as a rule, only from 2 to 50 colonies occurred 

 on a test panel, the first 5 panels in the test were covered, and 

 the fourth was 60^ covered. Cryptosula pallasiana , Cryptosula sp., 

 and Gemelliporidra magniporosa were identified. 



97 



