Figure 7 

 Outside portion of a completely destroyed electrolytic-copper- 

 sulphate treated pile frcm U.S.W.A.S., Sitka, Alaska. Pile had "been 

 in service l8 months. Most of the visihle damage was caused "by 

 Teredinidae "but Limnoria is also present in numbers. 



Figure 8 

 Typical inside portion of the pile shovm in Figure 7« Note that 

 the pile has "been completely riddled^ vith full-grown Teredo in plain 

 view. 



10 



