Plate 46. 



1-8. Salenia Pattersoni A. Ag. 



1. Valve of quadridentate pedicellaria. x 70. 



2. Side view of valve of another quadridentate pedicellaria. x 70. 



3. Valve of tridentate pedicellaria. x 70. 



4. Valve of globose pedicellaria. x 70. 



5. Valve of ovoid pedicellaria. x 70. 



6. Valve of another ovoid pedicellaria. x 70. 



7. Spicules from pedicels. X 215. 



8. Sphaeridiura. X 70. 



9-16. Dialithocidaris gemmifera A. Ag. 



9. Tridentate pedicellaria. x 30. 



10. Valve of tridentate pedicellaria, from side, x 70. 



11. Valve of tridentate pedicellaria ; interior view of base, x 70. 



12. Stalk of tridentate pedicellaria, after treatment with alkali, x 70. 



13. Ophicephalous pedicellaria. x 30. 



14. Large valve of ophicephalous pedicellaria. x 70. 



15. Small valve of ophicephalous pedicellaria. x 70. 



16. Valve of triphyllous pedicellaria. x 70. 



