3. Invertebrate ani.itial phyla . 



a. Coelenterata (hydro ids ). Hydrolds occurred as traces on 

 all the control panels and on the first test panel removed after one 

 month's submergence. They were recorded as light growths on the test 

 panels removed in August and September after submergence of 2 and 3 

 months, respectively. Tubularia was the only form identified. 



b. Bryozoa (encrusting ). Encinisting Bryozoa did not occur 

 on any of the 3 control panels nor on the first test panel removed 

 after submergence of one month. Numerous small colonies of Cal 1 ipora 

 craticula and Lichenopora verrucaria occurred on the test pajiels removed 

 in August aaid September after submergence of 2 and 3 months, respectively. 



c . Annelida (annelid worms ) . A few serpulid worms were 

 recorded on the test panels removed in September after a submergence of 

 3 months. No worms were recorded on the control panels. 



d. Arthropoda (crustaceans ). Balanus (barnacles) occurred 

 on all the control panels and on the test panels removed in Jtily and 

 August after submergence of 2 and 3 months, respectively. Few barnacles 

 were recorded, and the diameter of the largest of them was only 6 mm. 



e. Mollusca (nonboring moHusks ). Mytilus (mussels) were 

 foimd only on the test panels removed in August and September after 

 submergence of 2 and 3 months, respectively. The mussels were abundant, 

 and mostly juvenile, but some on the latter panel had attained lengths 

 of 10 mm. 



f. Chordata (tunicates ). Two colonies of tunicates of the 

 genus Molgula were recorded on the test panel removed in September after 

 submergence of 3 months. 



A3 .05 Surnmary and Conclusion 



1. Installation . A test board of the pajiel type was operated 

 at the U. S. Naval Section Base at Bar Heirbor, Mt. Desert Isle, Maine, 

 from June 12, 19^^, until its discontiniiance September 12, 1944. 



2. Test Results . 



a. Borers . During this brief period there was no evidence 

 of Teredinidae and only traces of Limnoria. 



26 



