194 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 22 



PLATE 9 

 Prionospio pinnata Ehlers (sta. 2193) 



1. Anterior end, in left lateral view, showing head and first 



16 setigerous segments, with attached palpi and 3 

 pairs of bipinnately divided branchiae, x 16. 



2. Ninth neuropodium, in anterior view, showing arrange- 



ment of uncini, capillary and genital setae, x 135. 



3. A hooded hook, seen from the side, x 1450. 



4. A hooded hook, in frontal view, x 1450. 



5. Base of genital spines and a hooded hook, seen protruding 



from neuropodial lobe, x 1445. 



