PLATE XVII. 



Fig. I. Clytia caliculata (Ilincks). 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. Campatiulafia ritteri Nutting. Part of colony (enlarged). 



(19S) 



