Plate XII. 



4, 6, 9, 1820, 22, 23, 26, 27, 2931 Echinocyamus pusillus. I, 3, 5, 8, 10 16, 21, 25, 28 Ech. grandiporus. 2, 7, 17, 24 



macrostomus. 



Fig. i. Echinocyamus grandiporus, actinal side. 6- 5/j. 



2. macrostomus, ophicephalous pedicellaria. s^s/j. 



3. grandiporus, actinal part of the test, from the inside. ?/,. 



4. pusillus, ophicephalous pedicellaria. 37/ It 



5. grandiporus, abactinal side. 6t 5/!. 



6. pusillus, head of ophicephalous pedicellaria. 325/ It 



7. macrostomus, triphyllous pedicellaria. 2 4 / t . 



8. grandiporus, valve of ophicephalous pedicellaria, (the two other valves of the 



same pedicellaria are represented in Figs, n and 12). 3 2 5/ x . 



9. pusillus, endcrown of miliary spine, from above. 3 2 5/i- 



10. grandiporus, 325 /i- 



ii. valve of ophicephalous pedicellaria. (Comp. Figs. 8 and 12.) s^s/j. 



- 12. ( - 8 II.) 325/ x . 



13. ophicephalous pedicellaria. s^s/j. 



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



bearing tubercles. 5<y r . 



- 15. primary spine. s/j. 



16. miliary I75 /i- 



- 17. macrostomus, young specimen, abactinal side. 8 /i- 



- 18. pusillus, miliary spine. '75/j. 



- 19. primary 5/ Ig 



- 20. valve of triphyllous pedicellaria. s^s/j. 



- 21. grandiporus, valve of triphyllous pedicellaria. s^s/j. 



- 22. pusillus, part of the test, showing the glassy protuberance between the pores 



of the petals, so/,.. 

 .23. valve of tridentate pedicellaria. 3*s/j. 



- 24. macrostormts, actinal side. 8 /!. 



- 25. grandiporus, valve of tridentate pedicellaria. s^s/,. 



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



and groups of small pores, s?/,. 



- 27. actinal side. 6 / r . 



- 28. grandiporus, tridentate pedicellaria. ^s/,. 



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



30. tridentate pedicellaria. I2 5/j. 



31. abactinal side. 6 / : . 



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

 than they are in nature. 



