PLATE IX. 



Egure 1. DicTYOPLEURUs ziczac, Duncan and Sladen (page 38), natural size. 



2. The apical system, magnified. 



3. Part of an ambulacrum and interambulacrum, magnified. 



4. DictyofleurUs Haimei, Duncan and Sladen (page 89), natural size. 



5. Part of an ambulacrum and interambulacrum, magnified. 



6. Arachniopleurus reticulatus, Duncan and Sladen (page 42), natural size. 



7. Part of an ambulacrum and interambulacrum, magnified. 



8. Some ridges near the apical system, magnified. 



