TUBULARIA. 39 



Fig. 10. The same as appearing subsequently, February 27. 



11. Monstrous reproduction of a head, afterwards becoming symme- 



trical. 



12. Monstrous reproduction from a cleft stalk. 



13. Monstrous reproduction from a cleft. 



14. Monstrous reproduction from a stalk fractured. 



15. Group of uncertain species — supposed the Tubularia Larynx. 



Plate III. — Propagation of the Tubularia Indivisa. 



Fig. 1. Prolific hydra, being one of the group Plate I., with an ovarium 

 consisting of several clusters of cysts, each containing an ovum 

 or an embryo. — Tentacula, a, oral palpi, h. Slightly larger 

 than life. 



2. Cluster of cysts. 



3. The same enlarged. 



4. Cluster of cysts. 



5. The same enlarged. 



6. Cluster of cysts in different stages, h. 



7. The same enlarged. 



8. Cluster of cysts less mature. 



9. Cluster of cysts, where the embryo is exposed through the semi- 



transparent sac, enlarged. 



10. Cyst expelling its ovum or embryo, enlarged. 



11. Another. 



12. Another. 



13. The same, — the embryo, i, having been expelled from the cyst, a, 



enlarged. 



14. Ova or embryos after expulsion, enlarged. 



15. Ova or embryos, of irregular size and shape, enlarged. 



16. Cluster of cysts wherein the contents are unequally advanced. — 



The tentaculum, a, of an embryo protruding from a cyst, b, en- 

 larged. 



17. Tentacula of an embryo farther advanced, protruding from a cyst, 



enlarged. 



18. Cluster of cysts unequally advanced, several tentacula, a, protrud- 



ing from their cyst, S, enlarged. 



19. Tentacula, a, from an embryo still farther advanced in the cyst, 



J, before expulsion, enlarged. 



