PLATE VI. 

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



1. Clytia caliculata (Hincks). Single hydrotheca (enlarged). 



2. Another hydrotheca (enlarged). 



3. Clytia compressa (Clark). Hydrothecae (enlarged) showing different 

 degrees of thickening of the hydrothecal walls. 



4. Single gonangium (enlarged). 



5. Campanularia rttteri Nutting. Part of colony (enlarged). 

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