Plate IL 



8 Spatangus purpureus. 19 Spat. Raschi. 12, 14, 16 Hybrid of Spat. purpureus and Rasc/ii. i, 4, 18, 20 Hemiaster expergitus. 



3. 7. 9i i3> i5> 17 Echinocardium pennatifidum. 5, 6, 11 Æ'c^. capense. 2, 10 ÆcA. flavescens. 



Fig. I. Hemiaster expergitus, abactinal side. 7,. 



— 2. Echinocardium flavescens, abnormal specimen; actinal side. '/i- 



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



— 4. Hemiaster expergitus, actinal side. 7,. 



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



— 6. — — side view. '/i- 



— 7- — pen7iatifidu7n, yoiing specimen; abactinal side. '/i- 



— 8. Spatangus purpureus, abactinal side. 7i- 



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



— 10. — flavescens, abnormal specimen; abactinal side. '/j. 



— II- — capense, abactinal side. '/i- 



— 12. Spatangus pjirpiiretis, hybrid; abactinal side. 7i- 



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



— 14. Spatangus purpureus, hybrid; actinal side. '/i- 



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



— 16. Spatangus p7irpureus, hybrid ; side view. Y,. 



— 17. Echinocardijim pennatifidum, abactinal side. '/i- 



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



— 19. Spatangus Raschi, side view. 7i. 



— 20. Hemiaster expergitus, side view. '/i- 



