PLATE IV. 

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



FlG. i. Garveia annulata Nutting. Part of colony, showing hydranths and 

 gonophores. 



2. Single hydranth, showing pseudo-hydrotheca (enlarged). 



3. Rudendrium vaginatum Allman. Part of colony, showing hydranths 

 and gonophores. 



4. Single hydranth, showing pseudo-hydrotheca (enlarged). 



5. Cluster of female gonophores. 



6. Single gonophore, with expanded chitinous collar (enlarged). 

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