336 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 11 



PLATE 3 



Figs. 1-9. Mertensiothuria leucospilota (Brandt). Supporting plate 

 from tube foot, buttons, table, and crown of spines on 

 table. 



Figs. 10-12. Mertensiothuria platei (Ludwig), from Juan Fernandez. 

 Buttons or plates from pafatypes. 



Figs. 13-23. Mertensiothuria fuscocinerea (Jaeger), Buttons from 

 skin. 



Figs. 24-29. Mertensiothuria pervicax (Selenka), from Hawaii. But- 

 tonlike rosettes and table with reduced spire. Similar 

 tables are also present in the skin of M. fuscocinerea, 

 but rare in both forms. 



(Magnification: Each division is l/lOO mm) 



