332 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 11 



PLATE 1 



Figs. 1-3. Isostichopus fuscus (Ludwig). Tables and C-shaped 

 body. 



Fig. 4. Isostichopus badionotus (Selenka). Table. 



Fig. 5. Lahidodemas americanum Deichmann. Table from type 



specimen. 



Figs. 6-9. Microthele difficilis (Semper). Table, disk of table, 

 plate from wall of tube foot, and button. 



Figs. 10-13. Brandtothuria arenicola (Semper). Buttons with rela- 

 tively large holes, table, and supporting rod. 



Figs. 14-15. Brandtothuria impatiens (Forskal). Table and button. 



Figs. 16-17. Brandtothuria gyrifer (Selenka). Disk of table and but- 

 ton from adult specimen. 



Fig. 18. Brandtothuria gyrifer (Selenka). Synallactidlike disk of 



table from 3 cm long specimen. 



(Magnification: Each division is l/lOO mm) 



