PLATE VIII. 



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



Fig. I. Campanularia regia Nutting. Single hydrolheca, showing hydranth 

 (much less enlarged than the other figures). 



2. Another hydrotheca, showing reduplication of margin. 



3. Hydrotheca of C. sJ>eciosa Clark (drawn to the same scale as fig. i, to 

 show comparative size). 



4. Obelia horealis Nutting. Part of colony, showing hydrothecae and 

 gonangium (enlarged). 



5 and 6. Gonangia (greatly enlarged). 

 [202] (220) 



