IX. — THE WORK OP THE CLIONE. 

 These are two typical shells taken from the waters of Barataria Bay, 

 showing the heavy boring that is done by the Boring Sponge. Although the 

 shell is perforated with small canals, there is no direct damage done to the 

 oyster. Only occasionally does the Sponge bore through the shell and kill 

 the oyster. 



