PLATE V. 



Figure 1. Cidaris, sp. (page 25). Au interradial plate^ magnified. 



2. A section of a plate^ magnified. 



3. A portion of an ambulacrum, magnified. 



4. Phyllacanthus, sp. (page 28). Part of a test, natural size. 



5. A plate, magnified. 



6. CiDARis Verneuili, D'Archiac and Haime (page 26). A plate, natural size. 



7. A plate, magnified. 



8. A section of a plate. 



9. Phyllacanthus Ranikoti, Duncan and Sladeu (page 27). The plates, natural size. 



10. An interradial plate, with a portion of an ambalacrum, magnified. 



11. Phyllacanthus Sindensis, Duncan and Sladen (page 27). A part of the test, natural 



size. 



12. A portion, magnified. 



