Part 3

11. ARACHNACTIS BRACHIOLATA 14

12. Young Arachnactis 14

13. Young Arachnactis showing the mouth 14

14. BICIDIUM PARASITICUM 15

15. HALCAMPA ALBIDA 16

16. Colony of ASTRANGIA DANÆ 17

17. Magnified individuals of Astrangia 17

18. Single individual of Astrangia 18

19. Lasso-cell of Astrangia 18

20. Limestone pit of Astrangia 19

21. Single individual of HALCYONIUM CARNEUM 19

22. Halcyonium community 20

23. Expanded individual of Halcyonium 20

24. Branch of MILLEPORA ALCICORNIS (Agassiz) 22

25. Expanded animals of Millepora (Agassiz) 22

26. Transverse section of branch of Millepora (Agassiz) 23

27. PLEUROBRACHIA RHODODACTYLA (Agassiz) 27

28. The same as Fig. 27 seen in plane of tentacles (Agassiz) 28

29. Pleurobrachia in motion 29

30. Pleurobrachia seen from the extremity opposite the mouth 30

31. BOLINA ALATA seen from the broad side (Agassiz) 31

32. Bolina seen from the narrow side (Agassiz) 31

33. IDYIA ROSEOLA seen from the broad side (Agassiz) 32

34. Young Pleurobrachia still in the egg 35

35. Young Pleurobrachia swimming in the egg 35

36. Young Pleurobrachia resembling already adult 35

37. Young Idyia 35

38. Young Idyia seen from the anal pole 36