PLATE IV. 



HG. 



1. CORYNE PUSILLA, p. 41, of the natural size. 



2. A portion of the same magnified. 



3. TUBULARIA GRACILIS, p. 52, of the natural size. 



4. TUBULARIA GRACILIS, magnified. 



5. Three of the reproductive bulbules of TUBULARIA GRACILIS, 



separated and magnified. 



