PLATE IV. 



PIG. 



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. 



