Plate Xll. 



4, 6, 9, 18—20, 22, 23, 26, 27, 29-31 Echtnocyamus pusillus. i, 3, 5, 8, 10—16, 21, 25, 28 Ech. grandiporiis. 2, 7, 17, 24 



£V^. macrostomiis. 



Fig. I. Echtnocyamus grandiporus , actinal side. ^-s/j. 



_ 2. — macrostomus, ophicephalons pedicellaria. ^^s/j. 



— 3. — grandiporus, actinal part of the test, from the inside. 7/i. 



— 4. — picsilhis, ophicephalons pedicellaria. 37/j. 



— 5. — grandiporus, abactinal side. ^-s/j. 



— 6. — pusillus, head of ophicephalons pedicellaria. szs/j. 



— 7. — macrostomus, triphyllous pedicellaria. ^■*°/i. 



— 8. — grandiportis, valve of ophicephalons pedicellaria, (the two other valves of the 



same pedicellaria are represented in Figs, ii and 12). 225/^. 



— 9. — pusillus, endcrown of miliary spine, from above. 325/^. 



— 10. — grandiporus, — - — — — — 32s z^. 



— II. — — valve of ophicephalons pedicellaria. (Comp. Figs. 8 and 12.) 325/j. 

 -12. — - — - - _(__8- II.) 325/j. 



— 13. — — ophicephalons pedicellaria. 325/j. 



— 14. — — part of the test, showing the glassy protuberances among the spine- 



bearing tubercles. 5°/,. 



— 15. — — primary spine. 50/j. 



— 16. — — miliary — '^s/j. 



— 17. — macrostomus, young specimen, abactinal side. 7i- 



— 18. — pusillus, miliary spine. '75/,. 



— 19. — — primary — so/j. 



— 20. — — valve of triphyllous pedicellaria. 325/,. 



— 21. — grandiporus, valve of triphyllous pedicellaria. 325/,. 



— 22. — pusillus, part of the test, showing the glassy protuberance between the jjores 



of the petals, so/,. 



— 23. — — valve of tridentate pedicellaria. 325/,. 



— 24. — macrostomus, actinal side. ^/j. 



— 25. — grandiporus, valve of tridentate pedicellaria. 32s/,. 



— 26. — pusillus, part of the actinal side of the test, showing the two large buccal pores 



and groups of small pores. 37/j. 



— 27. — — actinal side. ^/,. 



— 28. — grandiporus, tridentate pedicellaria. '75/,. 



— 29. — pusillus, actinal part of the test, from the inside. 7/,. 



— 30. — — tridentate pedicellaria. '^5/,. 



— 31. — — abactinal side, ^i- 



In the figures i, 5, 17, 24, 16 and 31 the small pores are made somewhat more conspicuous 

 than they are in nature. 



