PLATE LVIII. 



Figure 1. Clypeaster suffarcinatuSj Duncan and Sladen. Abactinal vieWj natural size 

 (page 376). 



2. Actinal vieWj natural size. 



3. Profile vieWj natural size. 



4. Part of an ambulacrum and adjacent interradium, magnified. 



5. Part of the margin of the peristome, magnified. 



6. Laganum tumidum, Duncan and Sladen (page 379). Ahactinal view, natural size. 



7. Actinal view, natural size. 



8. Apical system, magnified. 



9. Ornamentation of the abactinal surface, magnified. 

 10. Part of the test near the peristome, magnified. 



