Salinity expreesed as sodium chloride in parts per thousand 



A41 . 05 tferine Borers 



1. Teredinidae . Teredinidae , including Bankia setacea, Teredo 

 ( Lyrodus ) die^ensis , and Teredo navalis , were very active at this location 

 throughout the period of the test. They occurred in 18 of the ^0 

 control panels, ranging from minute pits to embryonic specimens. The 

 breeding season appears to extend from March to the middle of January. 

 Teredinidae occurred in all of the 59 test panels (one panel was 



not received). Specimens up to kkO mm in length were recorded in a 

 panel submerged for 8 months, and 15 of the panels in 19^5 and I9U6 

 were filled or more or less completely riddled in 8 months. The 

 attack In 191^5 and 19ij-6 was very heavy, but in 19l<-7 it rated only moderate. 



2. Llmnorla . Limnoria were quite active throughout the period 



of the test. They occurred on 28 of the kO control panels, with a maximum 

 number of 66O recorded on 2 of these panels in 19k6. They occurred in 

 Eill except one of the 59 test panels. The Limnoria attack never rated 

 more than slight In 19^5 and 1946 but attained a rating of medium heavy 

 in 1947. 



185 



