Plate II. 



S Spatangus purpureus. 19 Spat. Raschi. 12, 14, 16 Hybrid of Spat, purpureus and Raschi. 1, 4, 18, 20 Hemiaster expergiius. 



3, 7, 9, 13, 15, 17 Echinocardium pennatifidum. 5, 6, ti i?r/«. capense. 2, 10 .fiW*. flavcscens. 



Fig. i. Hemiaster expergihts, abactinal side. I / I . 



2. Echinocardium flavescens, abnormal specimen ; actinal side. I / I . 



— 3. pennatifidum, young specimen; side view. I / I . 



— 4. Hemiaster expergiius, actinal side. I / 1 . 



— 5. Echinocardium capense, actinal side. Z / I . 



— 6. — — side view. 1 J l . 



— 7. pennatifidum, young specimen; abactinal side. 1 / I . 



— 8. Spatangus purpureus, abactinal side. 1 / I . 



— 9. Echinocardium pennatifidum, young specimen; actinal side. 1 I 1 . 



— 10. flavescens, abnormal specimen; abactinal side. 1 / I . 



— 11. — capense, abactinal side. I / l . 



— 12. Spatangus purpureus, hybrid; abactinal side. I j 1 . 



— 13. Echinocardium pennatifidum, side view. l \ x . 



— 14. Spatangus purpureus, hybrid; actinal side. I / I . 



— 15. Echinocardium pennatifidum, actinal side. 1 / I . 



— 16. Spatangus purpureus, hybrid ; side view. 1 / I . 



— 17. Echinocardium pennatifidum, abactinal side. I / l . 



— 18. Hemiaster expergitus, end view. 1 { I . 



— 19. Spatangus Raschi, side view. 1 / I . 



— 20. Hemiaster expergitus, side view. I / I . 



