170 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 25 



PLATE 16 



Habitat of Polydora tvebsteri Hartman in Newport Bay, California 

 (Sta. 4907), forming U-shaped runways etched in exposed surfaces 

 of oyster shells, exposed at normal low tide. The slender white tubes 

 on the cluster at the left are those of Eupomatus gracilis Bush, x 1.8. 



