194 ALLAN' HANCOCK PACIFIC EXPEDITION'S VOL. 25 



PLATE 28 



Piromis roberti (Hartman) (Gulf of Mexico) 



1. Anterior end with oral structures everted, oral tentacles fallen 

 away, x 21 



2. Prostomium and overhanging tentacular base, in ventral view, x 53. 



3. A neuropodial fascicle from a median parapodium, x 22. 



4. Distal end of a bifid neuropodial seta, x 445. 



