194 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.8 



PLATE 30 



Psolidium planum, new species P- 1^5 



1-3. Shallow buttons or baskets from external layer in 

 sole. 



4. Smooth plate in deeper layer of sole. 



5. Curved plate from tube foot in dorsal. 



Psolidium ekmanij new species - p. 1+5 



6. Knobbed button from sole. 



Psolus squamatus (Koren), var. segregatus Perrier p. 147 



7. Button from sole. 



Psolus patagonicus Ekman p. 148 



8. Slightly hollow button with marginal knobs from sole. 



Psolus diomedeae Ludwig p. 149 



9-10. Knobbed to almost smooth plates from sole. 



