PLATE VIII. 



Pig. 



1 . A sketch of Fhysophora — ? 



2. A young Physophora — ? 



3 exhibits the mode of connexion of a hydrocyst with the dilated distal end of the coenosare. 

 4. The pneumatophore. 



5 — 8. Successive stages of the tentacular branches. 

 9. A thread-cell. 

 10 a — 12. Successive stages and various views of the nectocalyces. 



13. HMzophysa jiliformis. 



14. Its pneumatophore. 



15. One of the cellular processes developed from the reflected layer of the endoderm. 



16. A polypite, with its tentacle. 



1 7. Part of a tentacle, with its lateral branches. 



18. Part of the proximal end of such a tentacle, with its budding branches. 



19. A villus. 



20. Part of a tentacular branch. 



