PLATE LIII. 



Figure 1. Echinolampas Jacquemonti^ d'Archiac and Haime (page 337). Abactinal view of 

 a regularly convex, subdepressed form, natural size. 



2. Longitudinal profile of the same, natural size. 



3. Abactinal view of a high, subconical, and rather elongate form, natural size. 



4. Longitudinal profile of the same, natural size. 



5. Actinal view of the same, natural size. 



6. Abactinal view of a broad-petalled variety, natural size. 



7. The peristome and surrounding parts of the test, magnified. 



8. Abactinal view of a small subrotund test, natural size. 



9. Longitudinal profile of the same, natural size. 



10. Actinal view of the same, natural size. 



11. The peristome and surrounding parts, from the same specimen, magnified. 



12. Portion of an ambulacral petal, to show the ornamentation, magnified. 



13. Actinal view of a small tumid test, natural size. 



14. Longitudinal profile of the same, natural size. 



15. Echinolampas spheroidalis ?, d'Archiac (page 338). Actinal view of the test of 



the largest specimen, natural size. 

 ] 6. Abactinal view of another specimen, much crushed and weathered, natural size. 



17. Longitudinal profile of the same specimen as Pig. 15, natural size. 



18. Actinal view of a small specimen, natural size. 



19. Longitudinal profile of the same, natural size. 



Erratum in the lettering of the Plate :— For Fig. " 12 " (adjacent to Fig. 19) read " 18. 



