MOLLUSCA 65 



valves are an inch or less in length and are the means by which the 

 worm bores its way into the wood. The rest of the soft body is uncov- 

 ered so that the animal secretes a thin, smooth calcareous lining to its 



FIG. 460. Squid, Loligo pealii. 



burrow to protect itself from the rough edges of the wood. If the larvae 

 settle at the end of a log they burrow straight ahead in the direction 

 of the grain of the wood, but if they settle on the side of the log, they 

 bore across the grain for a short distance, usually within 2 inches, 



