ILLUSTRATIONS.' 



TEXT FIGURES. 



Page. 



Fir, . 1 . General anatomy of the Cheilostoruata 43 



2. Early stages in the development of the Cheilostomata 44 



3. Sketch showing proliferation of the endocyst in the Anasca (A) and in the Ascophora (B) . 47 



4. Structure of the olocyst 48 



5. Structure of the tremocyst 49 



6. Microstructure of the tremocyst and olocyst 50 



7. Structure of the tubules 51 



8. Structure of the pleurocyst 52 



9. Septulae and dietellae 53 



10. Diagram showing structure and terminology of the ovicells 55 



11. Passage of the eggs 57 



12. Hydrostatic functions 59 



13. Structure of the avicularium 62 



14. Structure of the vibraculum 65 



15. Structure of the vestibular arch, etc 69 



16. Sketch illustrating structure of the Malacostega 73 



17. Family Electrinidae D'Orbigny, 1851 74 



18. Genus Electra Lamouroux, 1816 76 



19. Genus Membranipora Blainville, 1834 78 



20. Genus Heterooecium Hincks, 1892 79 



21. Genus Pyripora D'Orbigny, 1852 79 



22. Genus Herpetopora Lang, 1914 81 



23. Structure of the Membraniporae 83 



24. Genera of Membraniporae without ovicell 85 



25. Genus Conopeum Norman, 1903 86 



26. Genus Adenifera Canu and Bassler, 1917 101 



27. Genera of Membraniporae with endozooecial ovicell 109 



28. Genus Hincksina Norman, 1903 Ill 



29. Genus Membrendoecium Canu and Bassler, 1917 120 



30. Membraniporae with hyperstomial ovicella, always closed by the opercular valve 124 



31. Genus Ellisina Norman, 1903 126 



32. Genus Grammella Canu, 1917 130 



33. Genus Tremopora Ortmann, 1890 139 



34. Genus Larnacius Norman, 1903 140 



35. Genera of Membraniporae with ovicells never closed by the opercular valve 141 



36. Genus Alderina Norman, 1903 142 



37. Genus Callopora Gray, 1848 146 



38. Genus Amphiblestrum Gray, 1848 157 



39. Genus Ramphonotus Norman, 1894 , 163 



40. Genus Tegella Levinsen, 1909 166 



41 . Miscellaneous genera of Membraniporae 17-1 



42. Genus Cauloramphus Norman, 1903 174 



43. Genus Ammatophora Norman, 1903 175 



' The plates of this Bulletin, 1G2 in number, with their explanations, have heen bound for convenient reference as a sep- 

 arate volume. 



XV 



