2. Limaorla . Llmaorla did not occur in any of the panels of 

 either the control or test series of Test Board No. 1; in Test Board No. 2 

 only 3 panels showed any evidence of them. There were 15 tunnels recorded 

 in the first of the control panels, 20 in the second of the teat panels, 

 and a single one in a suhaecLuent test panel. Thus, the Limaorla attack 

 rated hut a hare trace in 19M{- and 19^6, with ncme at all in 19^5 snA. 19^7 

 at the Canvoy Escort Base at Norfolk. 



Alk. Ok Fouling Agents 



1. Silt . Silt occurred on all the control and test panels of 

 "both test hoards, the deposits raoglng from traces to medium on those of 

 the control series, and tram, light to heavy on those of the test series, 



2. Algae . A trace of hrown algae occurred on a single one of 

 the test panels of Test Board No. 1. " 



3. Invert ehrate anlTrv=i,l phyla . 



a. Ooelenterata (hydroids and Metridium ). lydroids occurred 

 on 19 of the 1+1 control panels and. cm 3^ of the kl test panels of Test 

 Board No. Ij on Test Board No. 2 they occurred on 22 of the kh control 

 panels and on 38 of the 1+8 test panels. The occurrence was as traces to 

 light growths on the panels of hoth series. Tuhularla was the only form 

 identified. Metridium , a member of a different group of hydroids, 

 occurred on 3 of the 41 control panels and on 14 of the same number of 

 test panels on Test Board No. 1. On Test Board No. 2 they occurred on a 

 single control panel and on 2k of the 48 test panels. 



h. Bryozoa (encrusting ). Encrusting Bryozoa occurred on 

 5 of the control panels and on 5 of the test panels of Test Board No. 1, 

 while on Test3oard No. 2 they occurred on 12 of the 44 control panels 

 and on 22 of the 48 test panels. Electra crustulenta , E. monostachys , 

 and E. sp. were identified. 



c. Annelida (marine worms ). Serpulid ( Serpula ) tuhes 

 occurred on a single control panel and on 4 of the test panels on Test 

 Board No. 1. On Test Board No. 2 they occurred on 9 of the 41+ cantrol 

 panels and on 23 of the 1+8 test panels. They were mostly few in number, 

 HO heing the greatest number recorded on one test panel of Test Board 

 No. 2, the maximum length of any of these heing 45 mm. 



a. Ar thropoda ( crustaceaos ) . Balanus (hamacles) occurred 

 an 19 of the 4l control panels and on all except one of the 4l test 

 panels on Test Board No. 1; on Test Board No. 2 they occurred on 20 of 

 the kk control panels and on 44 of the 48 test panels. The maxiTmm 



61 



