PLATE XXIII. 



FIG. 



1. PLUMULARIA CRISTATA, p. 92, of the natural size. 



2. A piece of the same magnified. 



3. An ovarian vesicle of the same species magnified. 



4. PLUMULARIA MYRIOPHYLLUM, p. 99, from a Devonshire 



specimen given to me by Dr. John Coldstream. 



5. A portion of the same magnified. 



