PLATE XIX"-. 



Agassizia scrobiculata, f. 1-3. 



1. Young specimen, seen from the abactinal side, -*j*-. 



2. Same, seen in profile, -*j^. 



3. Same, seen from the actinal side, -*j^. 



ITucleolites epigonus, /. ^-6. 



4. Seen from the ahactinal pole, -Ij^. 



5. Seen from the actinal side, -^. 



6. Seen in profile, -ij^-. 



Maretia planulata, /. 7 - 12. 



7. Denuded test, seen from the aljactinal side. 



8. Same, seen from the actinal side. 



9. Somewhat smaller, covered with spines, abactinal side. 



10. Same, from the actinal side. 



11. Young specimen, from the abactinal side. 



12. Same specimen, from the actinal side. 



{Figs. 7-12 natural size.) 



