PLATE XLIX. 



Figure 1. Hipponoe proavia, Duncan and Sladen (page 310) . Fragment of a small test^ probably 

 belonging to this species^ natural size. 



2. HiPPONOE ANTiQtjA, Duucan and Sladen (page 313). Abactinal view of the test^ natural 



size. 



3. Actinal view of a smaller specimen, natural size. 



4. Profile view of the same fragment, natural size. 



5. Echinus subcrenatus^ Duncan and Sladen (page 317). Abactinal view of the test, 



natural size. 



6. Ambulacral and interambulacral plates, a little above the ambitus, magnified. 



7. ScHizASTER suFPLATUs, Duucau and Sladen (page 339). Abactinal view of the test, 



natural size. 



8. Longitudinal profile of the test, natural size. 



9. Ambulacral plates in the odd anterior ambulacrum, magnified. 



