PLATE XIX. 



Figure ]. Pkenastkr oviformis, Duncan and Sladen (page 90). View from above, natural size. 



2. Actinal surface, natural size. 



3. -Side view, natural size. 



4. Posterior view, natural size. 



5. Part of the odd anterior ambulacrum and ornamentation, magnified. 



6. Part of an antero-lateral ambulacrum, magnified. 



7. Hemiaster ELONGATUs, Duncan and Sladen (page 78). The test, from above, natural 



size. 



8. Actinal surface, natural size. 



9. The apical system, magnified. . 



10. Outline of side view of a specimen, natural size. 



11. Part of the anterior ambulacrum^ magnified. 

 12.. 



13. y Outlines of the test of small specimens, from above, natural size. 

 14.3 



15. The test, from behind, natural size. 



