Plate IX. 



1. Thuiaria thuja, nat. size, p. 119. 



2. Antennularia antennina, nat. size, p. 123. 



3. Plumularia halecioides, nat. size, p. 127. 



4. Plumularia setacea, nat. size. 4a, Calycles en- 



larged, p. 124. 



5. Aglaophenia plunia, nat. size, p. 128. 



6. Halicornaria pennatula, nat. size (after Hincks), 



p. 132. 



7. Hydra viridis, enlarged, p. 135. 



