e. Chordata (tunlcatea ) . Tunicatea occurred sporadically in 

 small numters on the panels. Ascidians vera recorded on a single panel 

 each of the control and test aeries, a total of 50 'being- recorded on the 

 test panel. Ciona occurred in small numhers on 2 panels each of the 

 control and teat seriea, a total of 50 "being recorded on one of the latter. 

 Other tunicatea (mostly Botryllus schlosseri ) occurred on 2 of the 

 control panels and 6 of the teat panels, the number of colonies 

 on individual panels ranging from 2 to 20. • 



A8.O5 Siimrnary and Conclusions 



1. Installation . A test hoard of the panel type installed at the 

 U. S. Submarine Base at New London, Connecticut, on June 10, 19^^, is 

 still "being operated. The results of this test have heen summarized to 

 the end of ISkj . 



2. Test Eeaults . 



a. Borers. The attack hy Teredinldae at this location was rated 

 as very heavy in 19*+^, 19^5^ and 19^7, with panels hecoming riddled in 

 as "brief a period as h months. The Teredo attack in 19k6 was less 

 severe. Daring all the years, the "breeding season was limited to the 

 warmer months from the middle of July to the middle of Octo"ber. Limnoria 

 were present, mostly in small numbers, for a large part of the time covered 

 "by the test, "but the attack never rated more than a trace except late 

 in 19^7 J when the rating rose to slight. 



"b. Fouling Organisms . Silt, algae, and inverte"brate animals 

 "belonging to 5 phyla contri'buted to fouling of the panels. The latter 

 compriaed hydroids, encrusting and filamentous Bryozoa, barnacles and 

 amphipods, miscellaneous nonboring mollusks, and tunicates. Hydroids 

 occurred with considerable frequency and regularity, and barnacles 

 somewhat leas so, while the occurrence of Idie other organisms was merely 

 sporadic . 



5. Becerit Addenda . The Teredinidae attack rated very heavy at this 

 station in both 19i^8 and I9U9. There was a slight attack of Limnoria 

 both years. 



h9 



