PLATE XVI. 



Figure 1. Neocatopygus rotundus, Duncan and Sladen (page 76). The test^ from above, 

 natural size. 



2. The test, from below, natural size. 



3. The floscelle and peristome, magnified. 



4. A side view of the test, natural size. 



5. The posterior view, magnified. 



6. The transverse outline. 



7. The apical system, magnified. 



8. A small specimen, from above. 



9. The ornamentation, magnified. 



10. Part of an ambulacrum, magnified. 



