PLATE X. 

 [Proc. Wash. Acad. Sci., Vol. Ill, PI. XXI.] 



FIG. I. Campanulina rugosa Nutting. Part of colony, showing hydrothecae and 

 gonangia (enlarged). 



2. Gonangium, showing developing medusa (enlarged). 



3. Lafoea adhcerens Nutting. Part of trophosome (enlarged). 



4. Part of transverse section of gonosome (enlarged). 



5. Grammaria immersa Nutting. Part of main stem (enlarged). 



6. Portion of branch with the peripheral tubes removed to show connection 

 of hydrothecse with axial tube (more enlarged than fig. 5). 



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