rive spec±men6 of Musculua lateralis were recorded on single test panels 

 of "both test Ijoeurds. A solitary specimen of the family Pterldldae vas 

 recorded on a single control panel of Test Board Ko. 2. 



f. Chorda ta (txmlcates ). Tunlcates occurred q.uite abundantly 

 on a number of the panels of both test boards, especially on those panels 

 of Test Board No. 1. On this board, they occurred on 8 of the Uj control 

 panels. On Test Board No. 2 they occurred on h control panels and 

 on 6 test panels, the maximum number of colonies on any one of the latter 

 panels being 20. Botryllus schloagerl occurred on the panels of both 

 test boards; Clona and Molgula were recorded only on the test panels of 

 Test Board No. 1. 



AI8.O5 SiJTmnn.ry and Conclusions 



1. Installation . Two test boards of the panel type installed 

 June 7, 19^^, at the IT. S. Naval Submarine Base at Key West, Florida, are 

 still being operated. The results of these tests have been summarized to 

 the; fend of I9I+7. 



2. Test Results . 



a. Borers . Teredinidae were very active each year at both 

 locations, the breeding season apparently being limited to the months 

 from March through December, or sometimes to the middle of January or 

 February. Several of the test panels were riddled after 8 months' 

 submergence, and the attack rated as very heavy iii^ 19^5 at both locations. 

 Llmnorla also were very active throughout the period covered by the tests, 

 and the attack was very heavy. In fact unusually destructive, at both 

 locations. No Fholadidae were recorded at either location. 



b. Fouling Orgerii awa . Silt, algae, arid invertebrate 

 animals belonging to 6 phyla contributed to the fouling of the panels. 

 The latter Included hydrolds and Metrldium , encrusting and filamentous 

 Bryozoa, marine voiraa, barnacles and amphipode, miscellaneous nonborlng 

 mollusks, and tunlcates. Algae and hydrolds occurred with the greatest 

 frequency, and encrusting Bryozoa and marine worms occurred with less 

 frequency, while the occurrence of the other organisms was merely 

 sporadic or occasional. 



5. Recent Addenda . The Teredinidae attack on Test Board No. 1 was 

 moderate in 1948 and very heavy in 19^9. In I9U8, there was a slight 

 ^attack by Tiliimorla on the panels of this board, while in 19^9 tJi© 

 Llmnorla attack rated as moderate. On Test Board No. 2 there was a 

 moderate infestation of Teredinidae in 19^8, and a medium heavy attack 

 the following year. On this board Llmnorla rated medium heavy in 19^8 

 and heavy in 19^9 • 



88 



