338 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 11 



PLATE 4 



Figs. 1-2. Irenothuria maccullochi Deichmann. Disk of large table 



and profile of table. 

 Figs. 3-4. Irenothuria maccullochi Deichmann. Small tables, seen 



from above. 

 Figs. 5-7. Semperothuria languens (Selenka). Typical tables, side 



view. 

 Figs. 8-10. Semperothuria imitans (Ludwig). Typical tables, side 



view. 

 Figs. 11-12. Semperothuria imitans (Ludwig). Top of spire seen 



from above. 



(Magnification: Each division is l/lOO mm) 



