from traces to slight, "but atalnlng a maximum rating of moderate at 

 location No. 1 late in 19I+5 and at location No. 2 in 191^6. 



A6.0U Fouling Agents 



1. Silt . Silt, ranging from traces to light, occurred on 



all the control panels. Silt, ranging from light to moderate, occurred 

 on the test panels at hoth locations except on one each of the control 

 and test series at location No. 1. 



2. Algae . Traces of algae, mostly green, occurred on one test 

 panel at location No. 1 and on two each of the control and test panels 

 at location No. 2. 



5. Invertehrate ajiimal phyla . 



a. Coelenterata (hydroids) . Hydroids occurred on most 

 of the control panels and on all test panels except one at hoth 

 locations. The control panels showed traces; the growth on the 

 test panels ranged from traces to light or rajrely moderate. The 

 majority of hydroids was Tuhularia, hut Metridium also occurred on 

 a few test panels. 



h. Bryozoa (encrixsting and filaaentous) . Encrusting 

 Bryozoa were lacking from the control panels- at "both locations hut 

 occurred on 28 of the 56 location No. 1 test panels and on 25 of the 

 36 at location No. 2. Bryozoa found were Tegella unicornis , hut 

 Electra cruatulenta , Electra ap ., Callipora craticula , and Crihilina 

 pinctala also were identified. Filamentous Bryozoa were ahaent from 

 the control panels at hoth locations hut occurred more or leas 

 ahundantly on 8 of the teat panels at location No. 1 and on 6 of 

 the panels at location No. 2. Bu^ula flahellata and Bugula sp. 

 occurred most frequently. 



c. Annelida (marine worms) . Traces of aerpulid (Serpula) 

 worms appeared on 5 test panels at location No. 1 and on one test 

 panel at location No. 2. 



d. Arthropoda (crustaceans) . Balanua (hamacles), ranging 

 from anhryonic to jurenile, occurred on k of the control panels at 

 location No. 1 and on h of the control panels at location No. 2, 

 developing on the panels exposed during the months from April through 

 September. Tliey occurred more or leas ahundantly on 25 of the test 

 panels at location No. 1 and on 26 of the panels at location No. 2, 

 with a maximum diameter of I5 ram. after 8 months' submergence. 

 Several of these panels were from 20^ to 60^ covered after 8 to 10 

 months' suhmergencs. Amphipods (mostly Corophium ) appeai'ed on one 

 test panel at location No. 1 and on 5 test panels at location No. 2, 

 the greatest numher on any panel being 200 Corophium . A ti-ace of 

 isopoda was recorded on a single test panel at location No. 1. 



35 



