PLATE X. 



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



Fig. I. Campanulina rii^osa Nutting. Part of colony, showing hydrothecae and 

 gonangia (enlarged). 



2. Gonangium, showing developing medusa (enlarged). 



3. Lafcea adhcereiis Nutting. Part of trophosome (enlarged). 



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



5. Grammaria itnmeysa 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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