and on 7 of the 1^5 test panels, the growths rating only traces on the 

 panels of "both series. Mostly green algae occurred, hut red klgae 

 were found on one test panel. 



5. Invertebrate animal phyla . 



a. Coelenterata (hydroids and Metrldium ) . Hydrolds occurred 

 on 28 of the l<-5 control panels and on 45 of the 50 test panels of Test 

 Board No. 1. On Test Board No. 2, they occurred on 35 of the 58 control 

 panels and on 59 of the h^ test panels. The growths ranged from traces 

 to light on the panels of hoth series. On practically all the infested 

 panels, Tuhularia vas the only form identified. However, a few specimens 

 of Metridium , a memher of a different group of Coelenterata , occurred on 

 a single test panel of Test Board No. 1. 



h. Bryozoa (encrusting and filamentous ). Encrusting Bryozoa 

 occurred on only one of the i^5 control panels and on 5 of the 50 test 

 panels of Test Board No. 1. .On Teat Board No. 2 they occurred on 7 of 

 the 58 control panels and on SO of the h^ test panels. The forms 

 identified comprised Cryptosula pallasiana , Electra sp., and Schizoporella 

 unicornis . Filamentous Bryozoa occurred on 5 control panels and on k test 

 panels of Test Board No. 1. On Test Board No. 2 they occurred on 5 of 

 the 58 control panels and on 6 of the U5 test panels . Bugula neritina 

 and Bugula sp. were the only forms identified. 



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

 occurred on 1*)- of the il5 control panels and on 21 of the 50 test panels 

 of Test Board No. 1, the maximum length recorded "being 25 mm. One test 

 panel was 55^ covered and 6OO specimens were recorded on another. On 

 Test Board No. 2 they occurred on ik of the 58 control panels and on 29 

 of the l»-5 test panels, the maximum length recorded heing 55 ™i« Oi^® test 

 panel was ^0^ covered, and 5OO specimens were recorded on another. 

 Several hundred to several thousand minute, thread-like calcareous tuhes 

 of Salmacina occurred on 2 control panels and on 2 test panels of 



Test Board No. 1. 



d. . Ar thr opoda ( crus tac e ans ) . Balanus (barnacles) occurred 

 only on occasional panels of both test boards. They were recorded on 



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



on a singel control panel and on 2 test panels of Test Board No. 2. 



The maximum diameter recorded wajs 8 mm, after k months' submergence. 



Amphipods ( Corophium ) occurred only a single control panel and on 



2 test panels of Test Board No. 1, the maximum number recorded on any 



panel being 100. 



e. Mollusca (nonboring mollusks ). Miscellaneous mollusks. 

 occurred occasionally on the panels of both test boards. A few specimens 

 of Anomla (jingle -shells) were recorded on a single control panel and on 

 2 test panels of Test Board No. 1, the maximum diameter being 20 mm. 



87 



