PLATE V. 



ZOOPHYTES, POLYPS, XANTHIDIA, ETC. 



1. FUNOIA agariciformis. 



2. ALCYONIUM, CYDONIUM MULLERI. 



3. CYDONIUM, with polyps protruding and tentacles expanded, others closed. 



4. XANTHIDIA in flint. 



5. MADREPORE ABROTANOTDE. 



6. MADREPORE cell magnified, showing its internal structure. 



7. CORALLID^E: Corals. 



8. CORAL, with polyps magnified and protruding from the cells. 



9. GOBOONIA nobilis, with polyps magnified and expanded. 



10. TUBIPOBA MUSIC A. 



11. Tube of same, with polyp expanded, one being cut longitudinally to show its 



internal structure. 



12. SERTULARIA, with polyps protruding; others being withdrawn into their cells. 



