PLATE XXV. 



Fig. 1. Sertularella gigantea. X 8. 



— 2. A hydrotheca and a gonotheca of Campanularia sp. x 18. 



— 3. A gonotheca of the same species, x 18. 



— 4. A hydrotheca of Campanularia sp. from Greenland, x 50. 



— 5. A hydrotheca of Campanularia sp. from Iceland, x 50. 



— 6. Garveia groenlandica. x 50. 



