362 ALLAX HAXCOCK PACIFIC EXPEDITIONS VOL.10 



PLATE 29 



Figures 15-17, Phracjmaiopoma californica: Fig. 15, 3-day-oid larva, 

 showing distribution of pigmentation, setal sacks, ciliated ali- 

 mentary tract, and swimming setae; Fig. 16, tip of larval, swim- 

 ming seta; Fig. 17, metamorphosing larva, in dorsal view, with 

 setal sacks permanently pushed forward, all but one larval seta 

 replaced by opercular paleae, but with a pair of transitional 

 spinous setae in the last thoracic segment, and with I abdominal 

 segments preceding the thick caudal region. 



