Plate IL 



Spatangus purpureus. ig Spat. Raschi. 12, 14, 16 Hybrid of Spat, purpureus and Raschi. i, 4. iS, 20 Hemiasier expergitus. 



3, 7, 9, 13, 15, 17 Echittocaydium pennatifidum. 5, 6, 11 ^f//. capense. 2, 10 ^c/z. flavcscens. 



Fig. I. Hemiaster expergitus, abactinal side, '/i- 



— 2. Echiiiocardium flavesceiis, abnormal specimen ; actinal side. 7i- 



— 3. — pninatifidum, young specimen; side view, '/i- 



— 4. Hemiaster expergitus, actinal side, '/i- 



— 5. Echinocardium capense, actinal side, '/i- 



— 6. — — side view, '/i- 



— 7. — pennatifidum, young specimen; abactinal side, '/i- 



— 8. Spatangus purpureus, abactinal side. '/j. 



— 9. Ecliinocardium pennatifidum, young specimen; actinal side. '/j. 



— 10. ' — fiavescens, abnormal specimen; abactinal side, '/i- 



— II. — capense, abactinal side. 7i- 



— 12. Spatangus purpureus, hybrid; abactinal side, '/i- 



— 13. Echinocardium pennatifidum, side view. '/j. 



— 14. Spatangus purptireus, hybrid ; actinal side. '/,. 



— 15. Echinocardium pennatifidum, actinal side, '/i- 



— 16. Spatangus purpureus, hybrid ; side view. '/i. 



— 17. Echinocardium pennatifidum, abactinal side. '/j. 



— 18. Hemiaster expergitus, end view. '/i. 



— 19. Spatangus Raschi, side view. '/j. 



— 20. Hemiaster expergitus, side view. 7i- 



