;! 



as chloride (milligreims per liter), 20,900; as sodium chloride, 5^*500. 

 In regard to pollution, it vas stated that a'l^ng the south side of the 

 Section Base there is a k-±n. line discharging from a' septic tank. The 

 over-all distance from this U-in, line around the comer to the test 

 hoard is approximately 175 ft, 



AI8.O5 Marine Borers 



1. Teredinidae » Teredinidae , including BanMa sp., Teredo clappi , 

 T. parksi , T. ( Lyrodua ) sp., T. ( Psiloteredo ) sp., and T. sp., were very 

 active each year at hoth locations. They occurred in 22 of the k'^ control 

 panels of Test Board No. 1, and in 23 of the 38 of Test Board No. 2, 

 ranging from mere pita to minute specimens. It was indicated that the 

 hreeding season was limited from March through Decemher, or sometimes 



to the middle of January or Fehruary, In the test panels at "both locations, 

 they occurred in nearly all panels that were submerged for 2-^ months 

 or more, and several of these were, riddled after 8 months' suTamergence . 

 The maximum lengths attained hy specimens in these panels were 220 mm ^ 

 in Test Board No. 1, and I90 mm in Test Board No. 2. The attack hy 

 Teredinidae rated as very heavy in 19^5 at hoth locations. 



2. Limnoria . Limnoria also were very active throughout the period 

 covered hy the tests and occurred in all the panels of hoth test hoards. 

 The severity of attack varied, with peaks occurring at intervals, hut 



in general, the attaxik rated very heavy each year at hoth locations. Test 

 panels removed on June 7, 19^5^ after 8 months* suhmergence, showed 

 Limnoria counts of 21,000 and 20,000, respectively, indicating that the 

 attack was unusually severe. The next 2 test panels removed from Test 

 Board No. 2, which were left suhmerged for 12^ and 11^ months, respectively, 

 were destroyed hy the combined attacks of Teredinidae and Limnoria . 



5. Pholadidae . No Pholadidae were recorded at either location. 



Al8.0l»- FouliiJg Agents 



1. Silt . Silt occurred on all the panels of hoth test hoards 

 except on one control and one test panel of Test Board No. 1, and on 2 

 test panels of Test Board No. 2. The deposits, mostly a gray clay, 

 ranged from traces to moderate on the control and test panels of hoth 

 test hoards, with occasionally heavy deposits on the test panels of Test 

 Board No. 1. 



2. Algae . Algae occurred on 3I of the U5 control panels and 

 on 35 of the 50 teat panels of Test Board No. 1, the growths generally 

 ranging from traces to moderate on the panels of hoth series. On Teat 

 Board No. 2, however, they occurred on only k of the 58 control panel? 



86 



