EXPLANATION TO PLATE IX. 



FIG. 1. Tliiiiiii-in kurila' (Pieppig). Part of branch (enlarged). 



. 2. Tliiiiiifin l:uril;i . Single hydrothcca, showing margin (greatly enlarged). 



3. Tlniiin-iii iiiniii'i-xu Nutting. Part nf branch (enlarged). 



4. Tliiiiiifin iiiniirrsit. II ydrothecic (greatly enlarged). 



5. Tliiiini-iii luiifliilix (Ellis and Snlander). Part of branch with gonangia (enlarged). 



t>, 7, 8. Tliiiini-iii Innrliit'iK. Hydrothecie, showing variation in margin (greatly enlarged). 

 9. Thuiaria plumulifera Allman. Part of branch (enlarged). 



10. Thuiaria plumulifera. Part of another colony (enlarged). 



11. Tliiiiiii-in /iliiiiin/il'i'i'ii. I'art, of main stem, showing branch origin (enlarged). 



12. 1!'.. Thuiaria plumulifera. Hydrothecse, showing margin (greatly enlarged). 



184 



