Plate VI. 



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



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



— 2. — — — side view. 7/j. 



— 3. — — paradoxa, actinal side. '-Yi- 



— 4. — — — side view. '-71. 



— 5- — — — abactinal side. '"Yi. 



— 6. — — — side view. '-^i. 



— 7- — — phiale, actinal side. 7/1. 



— 8. Plexechi7ius hirsutus, end view. ^/j. 



— 9- — — actinal side. ^/j. 



— 10. Urechinus tiaresiaitns, actinal side. '-s/,. 



— II. — - - - -5/,. 



— 12. Plexechinus hirsutus, abactinal side. ^/i. 



— 13- - - - - Vi- 



— 14. — — side view. ^i- 



— 15- - _ _ _ 2/^. 



— 16. — — actinal side. '-5/,. (Not the same specimen as Figs. 12 and 15). 



— 17. Echinosigra (Pourtalesia) paradoxa, abactinal side. ^i- (For the apical system and adjoining 



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



— 18. — — ■ — abactinal side. i-^i- 



— 19- — — — side view. ^i- 



— 20. — — — actinal side. '-^i. 



— 21. - - _ _ _ 6/^. 



