KXPLAXATIOX OF PLAT]'. X\; 



(All ngiircs after Chirk. ) 



He,mi.\ster r.\R-\ST.\Trs { ilijrti.ni ) p. 29S 



1-4. Di.irsal, \'eutral. lateral and posterior views of a complete 

 indnidual. 

 5. .Viiterior aniliulaeruiii, enlarged. 

 6-7. Portie.ns of tile petaloid and basal regions of the anterior 

 anibulacruni, niueh enlarged. 



8. Se\"eral plates from the pet.'di.iid region of the right antero- 



lateral ambnlaerum, mneli enlarged. 



9. Three interambulacral plates with fasiolc. enlarged, 

 to. Portion of fascicle, highlj' magnified. 



11-12. Two \iews lif a tuhercle, from the side .and from above. 

 13. Apical disk, enlarged. 



/ ' iiu'ciiii'Zcii liiiicsiuui. 



910 



