PLATE XXV. 



Figures 1-8. Sismondia polymorpha, Duncan and Sladen (page 137). Abactinal view of a 

 series of specimens to show the variations of the marginal outline, natural size. 

 9. Abactinal view of the test of the same specimen as Fig. 8, magnified x 3^. 

 TO" Actinal view of the same specimen, magnified x 2^. 



11. Longitudinal profile of the same specimen, magnified X 2^. 



12. Apical disk and surrounding portions of the test, magnified. 



13. Peristome and surrounding portions of the test, magnified. 



14. EcHiNOCYAMUS NOMMULiTicus, Duncan and Sladen (page 132). Abactinal view, 



natural size. 



15. The same, magnified. 



16. Actinal view of the test, magnified. 



17. Longitudinal profile, magnified. 



18. Transverse profile, magnified. 



19. Apical disk and surrounding portions of the test, magnified. 



20. Peristome and surrounding portions of test, magnified. 



21. EcHiNocYAMUs NUMMULiTicus, var. OBEStTs (page 134). The test, natural size. 



22. Abactinal view of the test, magnified. 



23. Actinal view of the test, magnified. 



24. Longitudinal profile, magnified. 



25. EcHiNOCYAMUs NUMMULITICUS, var. oviFORMis (page 135). The test, natural size. 



26. Abactinal view of the test, magnified. 



27. Actinal view of the test, magnified. 



28. Longitudinal profile, magnified. 



29. EcHiNocYAMus NUMMULITICUS, var. PLANUS (page 135). The test, natural size. 



30. Abactinal view of the test, magnified. 



31. Actinal view of the test, magnified. 



32. Longitudinal profile, magnified. 



33. EcHiNocYAMus ROTUNDUs, Duucan and Sladen (page 135). The test, natural size. 



34. Abactinal view of the test, magnified x 4. 



35. Actinal view of the test, magnified x 4. 



36. Longitudinal profile, magnified x 4. 



37. Apical disk, magnified. 



