In TJSNC-5, BvOiinsrged at tlie Custom Hcnise Pier, the majcjrity of the test 

 panels vere filled or riddled with specimens up to 2li-0 ma. in length. At 

 all these four locations the attack "by Teredinidae vas rated as very 

 heavy, especially so in the case of the lower "board at the Deperming 

 Station and the one at the Custom House Pier. In USKC-IU, with the top 

 su"bmerged to mean low water at Pier 517-C, the mnyiTmnn attack l)y 

 Tere'^l'n^dae rated only slight; no panel sliowed more than 1 to 10 speci- 

 mens, and the greatest length recorded was 185 mm. 



2, T.iTTinoria . In contrast to the Teredinidae , Limnoria in 

 general showed little or no activity at most of the locations. In USNC-l, 

 submerged at the lower depth at Pier 317-C, only a single specimen was 

 recorded oti a control panel submerged in June 19^7^ and none was recorded 

 on any of the test panels. No evidence of Limnoria was recorded on the 

 upper test "board at this location, or on either of the 2 test "boards at 

 the Deperming Station. However, LiTnnoria showed more or less activity at 

 the Custom House Pier throughout most of the period coTered hy the test. 

 It occurred in 2k of the k2 control panels, hut only on those panels sub- 

 merged during the months from April through November. The ninifljer of 

 tunnels recorded in the control panels ranged from 1 to kO. Limnoria 

 occurred in all except 2 test panels submerged from July 19^ through 

 June 19h6, and again in all panels removed from March through July 19^7* 

 after having been submerged for 8 months . The attack rated from only a 

 trace to slight most of the time, but attained a rating of moderate late 

 in 19i^5. 



A15.CA- Fouling Agents 



1. Silt . Silt occurred on practically all of the panels at all 

 locations, "the deposits on the control panels ranging from traces to 

 light, or rarely moderate, and deposits on the test panels ranging from 

 traces to moderate, with a heavy deposit on one panel. 



2. Invertebrate n.nlTnn.1 phyla . 



a. Coelenterata (hydroids ). Hydroids occurred on most of 

 the control panels at all locations and on all of the test panels except 

 one at all locations. The growths on the control panels ranged from 

 traces to light or rarely moderate or heavy, while the growths on the 

 test panels ranged from traces to moderate, rarely heavy, or veiy heavy, 

 Tubularia was the form identified most frequently; Pennaria tiarella 

 also occurred. Metridium , a member of a different group of Coelenterata , 

 also occurred. 



b, Bryozoa (encrusting and filamentous ). Encrusting 

 Bryozoa occurred on occasional panels at all five locations. They 

 were recorded on 5 control panels and 7 "test panels of the lower 

 board at Pier 517-C; on 5 test panels of the upper board at Pier 317-C; 



72 



