panels and Cfn 28 test panels. At the East Jetty at the Naval Drydocks, 

 moBsels occurred on 8 control panels and on l6 test panels. On the 

 control panels, maximum lengths of 9, 25, and 35 nm were recorded at 

 the Uavy Yard, Lockwood Basin, and East Jetty at the Naval Drydocks, 

 respectively. On the test panels, maximum lengths of 25, 20, l*-7, and 

 68 mm were recorded at the Navy Yard, Pier No. 7 at the Naval Itrydocks, 

 Lockwood Basin, and East Jetty at the Naval Drydocks, respectively. 

 Traces of other mollusks were recorded on occasional test panels, as 

 follows: Qnchidoris "bilamellata occunred on one panel at "both the Lock- 

 wood Basin and the East Jetty at the Naval Drydocks; Sajcicava occxxrred 

 on one at Pier No. 7 aj^ on one at the East Jetty at the Naval Drydocks. 



f . Chordata (tunicates ). Tunicates occurred in considerable 

 abimdance on the panels of the test "boards at all four locations. At 

 the Navy Yard, tunicates appeared on 7 of the k3 control panels and on 

 55 of the same number of test panels. At Pier No. 7 at Naval Drydocks, 

 they occurred on 11 of the it-5 control panels and on all hut one of the 

 k3 test panels. At the Lockwood Basin, they occurred on 9 of the Itl 

 control panels and on 28 of the kl test panels. At the East Jetty at 

 the Naval Drydocks, there were tunicates on k of the 20 control panels 

 and on 15 of the same number of test panels. Test panels were from 50^ 

 to 80^ covered in seven cases at Pier No. 7 at the Naval Drydocks, and. 

 In four cases at the Lockwood Basin. Botryllus schlosseri and Molgula 

 occuired commonly at all four locations. Ciona was recorded only at 

 the Navy Yard. 



A7.05 Siimnw.ry and Conclusions 



1. Installation . Four test hoards of the panel type installed 

 at different locations at the Boston Naval Shipyard, including points 

 at Boston, East Boston, and South Boston (three on June 15, 1^ and l6, 

 19Ml-, respectively, and one on May 29, X9'^6), are still heijag operated. 

 The results of these tests have "been suTtrniarized to the end of 19^7. 



2. Test BesultB . 



a. Borers . No evidence of Teredinidae was recorded on any 

 of the panels of the test hoards at any of the four locations. Limnoria 

 were quite active at all four locations, hut their occurrence on the 

 control panels was virtually limited to the months from the middle of 

 Fehruary or March to the middle of November or December, with the maxi- 

 mum number of tunnels occurring in the panels submerged from the middle 

 of March to the middle of April. In the test panels, the peaks of high 

 p.ctivlty also coincided closely at" all locations, with almost all attacks 

 occuarring from the middle of August or September to the middle of 

 -December on panels which had heen submerged for 8 months. The maximum 

 attacks rated heavy at the Navy Yard, Pier No. 7 at the Naval Drydocks, 

 and at the Lockwood Basin; and, contrary to expectations, only medium 

 heavy at the East Jetty at the Naval Drydocks. 



1^5 



