PLATE XVI. 



Fi". 1. Porites astrseoicles Lamarck, natural size. 



Fig. 2. Porites astrceoides Lamarck, portion of living specimen with polyps contracted. 



Fig. 3. Porites astrjeoides Lamarck, portion of fig. 1, magnified. 



Fig. 4. Porites astraeoides Lamarck, calicles more highly magnified. 



Fig. 5. Porites astrceoides Lamarck, horizontal section through a calicle, magnified. 



Fig. 6. Porites astrsKoides Lamarck, polyp with tentacles contracted, slightly magnified. 



Fig. 7. Porites astrteoides Lamarck, polyp giving passage to a planula through the mouth. 



Fig. 8. Porites astrjeoides Lamarck, polyp of fig. 7, more highly magnified with mouth wide open for the 



passage of the planula. 

 Fig. 9. Porites astreeoides Lamarck, fig. 6, more highly magnified. 

 Fi". 10. Porites astreeoides Lamarck, planula magnified. 

 Fig. 11. Porites astrJEoides Lamarck, part of the planula more highly magnified, showing the vibratory 



cilia. 

 Fig. 12. Porites astrceoides Lamarck, young polyp seen from above, magnified. 

 Fig. 13. Porites furcata Lamarck, living branch mth 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 expanded, 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 astraeoides Lamarck, vertical sections through calicles, magnified. 



