PLATE XV. 
Fig. 1. Siderastraea galaxea Blainv., specimen with polyps half expanded, natural size. 
Fig. 2. Siderastraea galaxea Blainv., part of specimen fully expanded, natural size. 
Fig. 3. Siderastraea galaxea Blainv., a polyp contracted, magnified. 
Fig. 4. Siderastrasa galaxea Blainv., polj'p partly contracted, in profile, magnified. 
Fig. 5. Sidera-straea galaxea Blainv., part of disc contracted, magnified. 
Figs. 6, 7. Siderastraea galaxea Blainv., polyps fully expanded, showing the peculiar hilobate tentacles. 
No note was found accompanying the figures to explain the dift'erence in size of the tentacles 
in the two figures ; possibly No. 7 represents Siderastraea galaxea, aud No. 6, Siderastraea siderea. 
Fig. 8. Siderastraea galaxea Blainv., specimen divested of animal matter, natural size. 
Fig. 9. Siderastraea galaxea Blainv., groups of calicles, magnified, multiplying by gemmotion. 
Fig. 10. Siderastraea galaxea Blainv., large calicle in process of division. 
Fig. 11. Siderastraea galaxea Blainv., vertical section, showing the synapticula and dissepiments, magni- 
fied. 
Fig. 12. Siderastrtea galaxea Blainv., horizontal section, showing the synapticula extending across the 
interseptal chambers as in Fungidas (see figs. 15 and 17). The following figures of Fungia 
Integra Dana, from the Pacific Ocean, were given on this plate to show by direct comparison 
the Fungiau character of siderastraea. 
Fig. 13. Fungia Integra Dana, part of a specimen, natural size. 
Fig. 14. Fungia Integra Dana, vertical section, showing synapticula, natural size. 
Fig. 15. Fungia Integra Dana, horizontal section, showing synapticula extending across the chambers. 
(Compare with fig. 12.) 
Fig. 16. Fungia Integra Dana, section through centre, natural size. (Compare with fig. 11.) 
Fig. 17. Fungia Integra Dana, part of fig. 15, magnified. 
Fig. 18. Fungia Integra Dana, outline of part of specimen, natural size. 
