26 ZOOPHYTES. 



The following conclusions result from the preceding observations : — 



I. The foliaceous Flustrae rising erect are penetrated by cells on one 

 or on both sides of the leaf, according to species. 



II. The genus is propagated by a ciliated gemmule, generated in the 

 cell, which is discharged at various seasons, to demonstrate the utmost 

 activity amidst the water. 



III. The motion of the gemmule relaxes after some days ; it becomes 

 stationary, and forms a fundamental cell, from which a hydra, the first of 

 a new colony, is generated. 



IV. The original cell of the Flustra carbasea, with its hydra, is hori- 

 zontal ; but a vertical leaf rises at one end wherein the second cell with 

 its hydra is formed, overhanging the first. 



V. The leaves of mature Flustrae are enlarged by a border of succes- 

 sive rows of cells containing young hydrse. 



Plate VIII. Fig. 1. Flustra Murray ana. 



2. Another specimen. 



3. Another specimen. 



4. Another specimen. 



5. Longitudinal section, shewing the arrangement of the parts. 



6. Portion compressed between two watch-glasses. 



7. Hydrce on the front of a leaf: avieularia on the side of the 



cells. 



8. Back of the leaf. 



9. Hydra from the end of a leaf. 



10. Hydra. 



11. Gemmules stationary. 



12. Nascent Flustrae. 



13. Nascent Flustra, having lost the first hydra, generated from 



the leaf. 

 All the preceding figures, except 1, 2, 3, 4, are enlarged. 



