f. Mollusca (nontorlng moHuske ) . Miscellaneous nontorlng 

 mollusks were recorded occasionally on the panels as follows: Anomia 

 (jingle -shells) occurred on k control panels and 9 test panels at the 

 Ferry Slip at the Naval Air Station, on a single control panel and k test 

 panels at the Ferry Slip at Pensacola, and on a single control panel and 

 2 test panels at the Railroad Trestle at the Naval Air Station. They 

 ranged from a trace to I50 in nximber. Ifaximuin. diamieters recorded were 6 mm 

 on a control panel and ^K) mm on a test panel after k months' submergence . 

 Traces of Ostrea (oysters) occurred on 3 control panels and 11 test panels 

 at the Ferry Slip at the Naval Air Station, on 9 test panels at the Ferry 

 Slip at Pensacola, and on I5 test panels at the Railroad Trestle at the 

 Naval Air Station. Meizimum diameters recorded were 50 mm on a control panel 

 and 14-5 itm on a test panel after k montha' submergence, tfcisculue lateralis 

 occurred on 5 test panels at the Ferry Slip at the Naval Air Station, the 

 maximum number being kO on any one panel. I^tilus (mussels) occurred on 



a single panel each of both the control and test series at the Ferry Slip 

 at the Naval Air Station, on 6 test panels at the Ferry Slip at Pensacola, 

 and on 5 test panels at the Railroad Trestle at the Naval Air Station. The 

 maximum number was 65 on any one panel. 



g. Chordata (tunicates ). A few colonies of tunicates occurred 

 on 2 test panels at the Ferry Slip at the Naval Air Station, on a single 

 panel each of the control and test series at the Ferry Slip at Pensacola, 

 and on a single control panel at the Railroad Trestle at the Naval Air 

 Station. Botryllus schlosseri, Ciona, and Malgula were identified. 



AI9 . 05 SuTimifiry and Conclusions 



1. Installation . Three test boards of the panel type, installed 

 at different locations at the Naval Air Training Base at Pensacola, Florida, 

 on July 22 and August 22, 19^+^, are still being operated. The results of 

 these tests have been summarized to the end of 19li-7. 



2. Test Results . 



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

 these locations. The breeding season extended from the middle of March, 

 but may be continuous some years at the Ferry Slip at the Naval Air Station. 

 The attack rated very heavy each year, including 19M4-, at each location, 

 panels becoming filled or riddled in as short a period as one to 5 months. 

 There was some evidence of Limnoria activity at all three locations, but the 

 severity of attack varied from year to year aaad at the different locations. 

 At the Ferry Slip at the Naval Air Station, the attacks attained peak rat- 

 ings of moderate in 19l)-5 and 1914-6 and heavy in 1914-7. At the Ferry Slip 



9h 



