Plate VI. 



Fig. i. Echinosigra (Pourtalesia) phiale, abactinal side. 7/ z . (For the apical system and adjoining 



plates, comp. PI. VII. Fig. 7.) 



2. side view. 7/ z . 



3. paradoxa, actinal side. 1<8 /j. 



4. side view. I-8 / I . 



5. abactinal side. I-8 /,. 

 6. side view. 1>8 / t . 



7. phiale, actinal side. 7/ : . 



8. Plexechinus hirsutus, end view. 2 / T . 



9. actinal side. 2 / x . 



10. Urechinus naresianus, actinal side. I- 5/ x . 



- ii. - "5/i- 



12. Plexechinus hirsutus, abactinal side. 2 / T . 



- 13- 2 /t- 



14. side view. 2 / T . 



- 15- - Vi- 



16. ^- actinal side. '-s/j. (Not the same specimen as Figs. 12 and 15). 



17. Echinosigra (Pourtalesia) paradoxa, abactinal side. 6 /,. ,(For the apical system and adjoining 



plates, comp. Text-fig. 14, p. 75.) 



18. abactinal side. I-8 /,. 



19. side view. 6 / 1 . 



20. actinal side. I-8 / I . 

 - 21. - '- 6 /L 



