PLATE XV. 



Figure 1. Rhynchopygus Calderi, d^Archiac and Haime, sp. (page 67). Side view, natural 

 size. 



2. Prom behind, natural size. 



3. The odd amhulacrum, slightly magnified. 



4. The pitted structure of the actinil median area, magnified. 



5. Rhynchopygus pygm^us, Duncan and Sladen (page 68) . The test, from above, natural 



size. 



6. Part of the phyllode and pitted structure, magnified. 



7. Cassidulus ellepticus, Duncan and Sladen (page 65). The test, from above, natural 



size. 



8. The transverse section, natural size. 



9. The floscelle and ornamentation, magnified. 



10. The ornamentation of part of an ambulacrum. 



11. Paralampas pileus, Duncan and Sladen (page 73). The side view of the test, natural 



size. 



12. The posterior view, natural size. 



13. The marginal outline, from the actinal side. 



14. The abactinal area, magnified. 



