174 ZOOPHYTES. 



Plate XXIX. Sertularia halecina — details. 



Fig. 6. Hump or gibbous vesicles, borne along with ovoidal vesicles, on the 

 same specimen. 

 7-8. Vesicles of different figures on the same specimen. 

 9-10. Vesicles borne on the grey parts of a specimen. 



11. Planulse from the green vesicles of the specimen. — PI. XXVII. 

 12-15. Diffusing root of nascent Sertularise. 



16. Hydrae generated from two planulae, approximated in their meta- 



morphosis. 



17. Spine and root in an early stage. 



18. Budding spine and root. 



19. The same, more enlarged. 



20. Nascent Sertularia with a diffusing root. 



21. Nascent Sertularia with two hydrse. 

 22-24, Young Sertularise bred from the planula. 



25. Spinous projection from each side of a root. 



26. Sertularia originating from an irregular root. 



27. White planulse from grey vesicles. 



28. Regenerated hydrse issuing through vesicles. 



29. Regenerated hydrse issuing through vesicles. 

 All the preceding figures enlarged. 



Plate XXX. Sertularia halecina and cognates. 



Fig. 1. Branch of a green specimen with gibbous vesicles. 

 2, S. Planulse from these vesicles. 



4. Diffusing root viewed from below. 



5. Nascent Sertularia, with a hydra and a bud, bred from the planula. 



6. Nascent Sertularia farther advanced, with two buds. 



7. Nascent Sertularia from a planula, showing the diffusing root ; also 



the pith within a wide sheath. 



8. Specimen which regenerated a number of hydrse. 



9. Regenerating hydrse not yet unfolded. 



10. Branch of a specimen with hydrse. 



11. Regenerated hydrse springing from an old branch. 



12. Green prunate vesicles [p. 168]. 



Only figs. 5, 6, are of the natural size. 



