PLATE XIV. 



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



. I. Tkuiaria elegans 'iiutX\ng. 



2. Front view of branch (much enlarged). 



3. Gonangium (much enlarged). 



4. Thntaria turgida Clark. 



5. Two pairs of hydrotheca (much enlarged). 



6. Front view of branch (enlarged). 



[214] (23a) 



