259 



TABLE No. 38 



SURVIVAL OF TEREDO NAVALIS IN STANDIN<; WATER* OF LOW SALINITY 



IN AQUARIA 



*Water renewed every two days by passing stream of same salinit>' through aquaria for a few 

 moments. 



**Specimcns acclimatized in 15 parts per 1000, and changed directly to lower salinities. 



TABLE No. 39 



SURVIVAL OF TEREDO NAVALIS UNDER VARIOUS EXPERIMENTAL CONDITIONS 



IN AQUARIA 



The process involved in this dilution of the water in the burrow is probably one 

 of diffusion through the wood of the pile and perhaps between the pallets at the mouth 

 of the burrow. It is also possible that the organisms may continue to draw in small 

 quantities of water through their siphons, thus gradually diluting the water in the 

 burrow; but this is not probable, since it was found that teredos were killed more 

 rapidly by running fresh water than by standing fresh water, which could hardly be 



