PLATE XX. 



Figure 1. Linthia Indica, Duucan and Sladen, variety (page 83). Aetinal vieWj natural size. 



2. Side view, natural size. Specimen rather crushed. 

 3*. Outline of test, natural size. 



3. Apical system, magnified. 



4. Linthia Indica, Duncan and Sladen, variety (page 82). Side view, natural size. 



5. Linthia Indica. Abactinal view, natural size. 



6. Posterior view, natural size. 



7. Young form. Side view, natural size. 



8. Posterior view, natural size. 



9. Linthia, sp. (page 85) . Abactinal surface, natural size. 



10. ScHiZASTER ALVEOLATUS, Duncan and Sladen (page 87 ) . From above, natural size. 



11. Posterior view, natural size. 



12. Ornamentation near the ambulacra, magnified. 



13. Antero-lateral petal, magnified, showing fasciole. 



14. Apical system of a specimen of a Schizastek from Kach, magnified ; but it is probable 



that it is not of the same species as the above. 



