LIST OF THE WOOD-CUTS. 



Unless otherwise specified, the illustrations are drawn from nature by Alex. Agassiz. 



iz) 



Fig. 



1. Transverse section of an Actinia (Agassiz) 



2, 3, 4. Actinia in different degrees of expansion (Agass 



5. Metridium marginatum fully expanded 



6. Vertical section of an Actinia 



7. View from above of an expanded Actinia . 



8. 9. Young Actinias 



10. Rhodactinia Davisii 



11. Arachnactis brachiolata .... 



12. Young Arachnactis 



13. Young Arachnactis showing the mouth . 



14. bicidium parasiticum .... 



15. Halcampa albida 



16. Colony of Astrangia DANiE 



17. Magnified individuals of Astrangia 



18. Single individual of Astrangia . 



19. Lasso-cell of Astrangia 



20. Limestone pit of Astrangia 



21. Single individual of Halcyonium carneum . 



22. Halcyonium community .... 



23. Expanded individual of Halcyonium 



24. Branch of Millepora alcicornis (Agassiz) 



25. Expanded animals of Millepora (Agassiz) 



26. Transverse section of branch of Millepora (Agassiz 



27. Pleurobrachia rhododactyla (Agassiz) 



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



29. Pleurobrachia in motion .... 



30. Pleurobrachia seen from the extremity opposite the mouth 



31. BoLiNA ALATA sccn from the broad side (Agassiz) 



32. Bolina seen from the narrow side (Agassiz) 



33. Idyia roseola seen from the broad side (Agassiz) 



34. Young Pleurobrachia still in the egg . 



35. Young Pleurobrachia swimming in the egg . 



36. Young Pleurobrachia resembling already adult . 



37. Young Idyia 



38. Young Idyia seen from the anal pole . 



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