166 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.8 



PLATE 16 



Pentacta peruana (Semper) P- 97 



1-3. Baskets from external layer of integument. 



4-6. Knobbed buttons from inner layer of integument. 



7. Supporting plate from tube foot. 



8. Knobbed plate from inner layer of integument near 

 base of tube foot. 



