TUBULARIA. 63 



Fig. 3. Stem, branches, aud hydrse of another specimen, shewing 

 the arrangement of the parts, enlarged. 



4. Branch of a specimen, illustrating the regeneration of its 



hydrse from x, y, z. 



5. Vesicles compressing the hydra, enlarged. 



6. Vesicles, partly dispersed on a branch, partly compressing 



the hydra whereby the variety of their form is illustrated, 

 enlarged. 



7. Planulse from yellow vesicles. 



8. Planula metamorphosing. 



9. Nascent hydra, previously a planula. 



10. Vascular substances of uncertain character. 



11. Branch bearing hydra and vesicles. 



12. Branch bearing hydra and vesicles. 



13. Part of a specimen with hydrse and vesicles, enlarged. 



1 4. Vesicles variously distributed, and hydra. 



15. Transverse section of the stem of the aged specimen, 



Plate VI. 

 All the figures of this Plate, except fig. 4 and fig. 13, are 

 enlarged. 



Plate IX. Tubularia (Sertidaria) ramea. Propagation. 

 Fig. 1. Branch with white vesicles. 



2. The same, enlarged. 



3. Planulse from white vesicles. 



4. PlanulEC in different stages of metamorphosis. 



5. Nascent tubularia ; root forming below ; and stomach above. 



6. Nascent specimen. 



7. Nascent specimen. 



8. Nascent specimen. 



9. Nascent specimen. — The cruciform root is not distinctly ex- 



exposed, in figs. 6, 7, 8, 9, from interception of the view. 



10. Nascent specimen, apparently monstrous, from the position 



or form of the hydra. 



11. Nascent specimen, considerably advanced. 



12-19. White planulse and their metamorphosis, in November. 

 All the figures, except the first, of this Plate, enlarged. 



Plate X. Tubularia (Sertularia) ramea, enlarged.— The original might 

 have been circumscribed by a circle an inch in diameter. 



