PLATE XVI. 
Fig. 1. Porites astrEeoides Lamarck, natural size. 
Fig. 2. Porites astrseoides Lamarck, portion of living specimen with polyps contracted. 
Fig. 3. Porites astrjeoides Lamarck, portion of fig. 1, magnified. 
Fig. 4. Porites astrseoides Lamarck, calicles more highly magnified. 
Fig. 5. Porites astrseoides Lamarck, horizontal section through a calicle, magnified. 
Fig. 6. Porites astrseoides Lamarck, polyp with tentacles contracted, slightly magnified. 
Fig. 7. Porites astrseoides Lamarck, polyp giving passage to a planula through the mouth. 
Fig. 8. Porites astrseoides Lamarck, polyp of fig. 7, more highl}' magnified with mouth wide open for the 
passage of the planula. 
Fig. 9. Porites astrseoides Lamarck, fig. 6, more highly magnified. 
Fig. 10. Porites astrseoides Lamarck, planula magnified. 
Fig. 11. Porites astrseoides Lamarck, part of the planula more highly magnified, showing the vibratory 
cilia. 
Fig. 12. Porites astrseoides Lamarck, young polyp seen from above, magnified. 
Fig. 13. Porites furcata Lamarck, living branch with polyps fully expanded ; natural size. 
Fig. 14. Porites furcata Lamarck, three calicles divested of animal matter, magnified. 
Figs. 15, 16. Porites furcata Lamarck, polyps fully e.xpanded, seen from the side and from above, 
magnified. 
Figs. 17-20. Porites furcata Lamarck, lasso-cells in various stages of expansion. 
Figs. 21, 22. Porites astrseoides Lamarck, vertical sections through calicles, magnified. 
