A47.03 tfajine Borers 



1. Teredlnidae . Teredlnidae , including Teredo ( Lyrodua ) sp. 

 and Teredo sp,, were active throvigh the period of the test. They 

 occiirred in 25 of the 29 control panels receiyed (one was destroyed 



"by the postal authorities), ranging in size from minute pits to embryonic 

 or minute specimens, and up to 15 mm in length. The majciraum mmiber in 

 any one of these panels was 2,015. They occurred in every calendar month 

 of the year, proving that the "breeding season at this location is 

 continuous. Teredinidae occurred in 25 of the 29 test panels received. 

 Specimens were recorded up to 1^5 mm in length after 6 months' submergence, 

 although the lengths could not be measured in several panels "because of their 

 almost complete destruction "by Limnoria . Two of these panels, one removed 

 on OctoTier 15, 19k6, and the other on November 15* after k months' submer- 

 gence, were 50^ filled. The attack rated moderate each year except 19^6, 

 when it attained a peak rating of medium heavy. 



2. Limiioria . Limnoria were extremely active throughout the, 

 period of the test, occurring in every one of the control panels and 

 even occurring in large numbers the first month. The prodigious number 

 of 7,260 tunnels were estimated to be in one panel submerged from May 15 

 to June 15 > 19^6. Limnoria occurred in all the test panels and so 

 abundantly that the attack penetrated to a depth of 8 mm in 5 months 

 and almost completely through a 2 -inch "panel in 6 months. The panels 

 were from 75^ to 90^ destroyed after 8 months' submergence, and others, 

 were still partially destroyed even after the period of submergence was 

 reduced to k months. The Limnoria attack was recorded as extremely 

 heavy each year except in 19^7* when the test board was operated only 

 briefly; it was the most severe attack recorded from any locality. 



5. Pholadidae . No Pholadidae were recorded from this location. 



Alj-7.0lt- Fouling Apients 



1. Silt . Silt occurred as traces to light or moderate deposits 

 on all the panels of both the control and test series, 



2. Alfcae . Green algae occurred as traces to rarely light or 

 moderate growths on k each of the 29 control paiiels and on 5 of the same 

 number of test panels. 



5, Invertebrate animal phyla . 



a. Coelenterata (hydroids ). Hydroids occtirred as traces 



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