EXPLANATION TO PLATE I. 



FIG. 1. Plumularia setacea Ellin. Portion of colony with gonangia (enlarged). 

 la. Plumularia srtavea. Young gonangiuin (enlarged). 



2. Plumularia setacea. Hydrotbeca and hydrauth (greatly enlarged ). 



3. Plumularia setacea. Part of a bydrocladinni (enlarged). 



4. Plumularia setacea. Portion of same (greatly enlarged). 



5. Plumularia megalocephala Allman (enlarged). (After Allraau.) 



6. Plumiilaria oligopyxis Kircheupauer (enlarged). (After Kirehenpauer.) 



7. Plumularia oliijopyxis. Hydrotbeca (greatly enlarged). (After Kircheupaner.) 



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