146 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 25 



PLATE 4 



Amphiduros pacificus, new species (Sta. 1441) 



1. Anterior end in dorsal view, x 50. 



2. A median parapodium in anterior view, x 60. 



3. A long-appendaged composite seta, x 1000. 



4. A short-appendaged composite seta, x 1000. 



