PLATE XX. 



Fig. 1. Branch with "tendril" of Lafoëa grandis, x 12. 



— 2. Branch with "tendrils" of Lafoëa fruticosa. x 12. 



— 3. A "bridge" on an old colony of Lafoëa fruticosa. Tubes grow 



along the bridge from both sides, most numerous however 

 from right to left, x 8. 



— 4. A "tendril" of Toichopoma obliquum. x 8. 



— 5. A stolonized branch of Sertularella triciispidata has fastened 



itself on a stone and formed stolons which have developed 

 two new hydrocauli. x 5' /2. 



— 6. A stolonized branch of S. tricuspidata has fastened itself to 



and twined round another branch of the same colony, x 12. 



— 7. A stolonized branch of S. tricuspidata which has begun to 



form hydrothecae again, x 12. 



— 8. Erect branch of Lafoëa serpens, x 9. 



