PLATE IX. 



Fig. 1. ]\l£Eandrina clivosa Verrill, reduced one half. 



Fig. 2. Maeandrina clivosa Verrill, details slightly magnified. 



Fig. .3. Maeandrina clivosa Verrill, septa, magnified. 



Fig. 4. Maeandrina clivosa Verrill, section through the ridge, magnified. 



Fig. 5. Maeandrina clivosa Verrill, polyps e.xpanded. 



Figs. 6, 7. Maeandrina strigosa Dana, portions magnified, seen in profile and from above. 



Fig. 8. Maeandrina strigosa Dana, septa, magnified. 



Fig. 9. Maeandrina strigosa Dana, section through ridge, magnified. 



Figs. 10, 11. Maeandrina labyrinthiformis Oken, portions magnified, seen in profile and from above. 



Fig. 12. Maeandrina labyrinthiformis Oken, section through ridge, magnified. 



Fig. 13. Colpopbyllia gyrosa Milne-Edw. and Haime, portion with polyps partly expanded, natural size. 



Fig. 14. Colpopbyllia gyrosa Milne-Edw. and Haime, polyp, magnified. 



Fig. 15. Colpopbyllia gyrosa Milne-Edw. and Haime, a polyp before division, magnified. 



Fig. 16. Colpopbyllia gyrosa Milne-Edw. and Haime, tentacles, magnified. 



