PLATE XXXVII. 



Figure 1. Micraster tumiduSj Duncan and Sladen (page 189). Abactinal view of the testj natural 



2. Actinal view of the test, natural size. 



3. Longitudinal profile of the test, natural size. 



4. Odd anterior ambulacrum, magnified. 



5. Portion of one of the petaloid ambulacra, magnified, 



6. Apical disk, magnified. 



7. LiNTHiA ORiENTAHs, Duncan and Sladen (page 317). Abactinal view of the test, natural 



size. 



8. Actinal view of the test, natural size. 



9. Longitudinal profile of the test, natural size. 



10. Odd anterior ambulacrum, magnified. 



11. Portion of one of the petaloid ambulacra, magnified. 



12. Apical disk, magnified. 



13. Abactinal view of an abnormal unsymmetrical test, natural size. 



14. Abactinal view of another abnormal unsymmetrical test, natural size. 



15. ScHizASTER sYMMETRicus, Duncan and Sladen (page 220). Abactinal view of the test, 



natural size. 



16. Actinal view of the test, natural size. 



17. Longitudinal profile of the test, natural size. 



18. The test seen from behind, natural size. 



19. Odd anterior ambulacrum, magnified. 



20. Portion of one of the petaloid ambulacra, magnified. 



21. Apical disk, magnified. 



