PLATE XL. 



Figure 1. Clypeaster simplex, Duncan and Sladen (page 257). The test, from above. 



2. Longitudinal section in outline. 



3. Clypeaster monticulifera, Duncan and Sladen (page 258). The test, from above. 



4. Longitudinal outline. 



5. EcHiNOLAMPAS DiFFiciLis, Duucau and Sladen (page 258). The test, abactinal view. 



6. The actinal surface. 



7. Side view of the- test. 



8. EcHiNOLAMPAS d'Archiaci, Duucau and Sladen (page 259). The test, abactinal view. 



9. Side view. 



10. EcHiNOLAMPAS Radakensis, Duucau and Sladen (page 260). The test, from above. 



