Fig. 11.1 



1. Siphonal end of Teredo navalis, showing position of pallets. X 5. 



2. Pallets in position, closing entrance to burrow. The dark area at the right is the opening to 

 the burrow of an older, retracted specimen. X 10. 



3. Pallets arranged in pairs, illustrating variation in two members of the same pair. X 5. 



4. Series of pallets from the Oakland Harbor Light Station, representing ages of approximately 

 two weeks (?), one month, two months, three months, and four months, respectively. 



.S. Comparison of a normal and nearly typical pallet from Goat Island with an older one from 

 the same location, showing maximal effect of age and erosion. 



