CELLULARIA. 239 



Plate XLVI. Fig. 1. Cellularia fastigiata. 



2. Portion shewing the arrangement of the parts. 



3. Portion with hydrse. 



4. Portion with hydrse, shewing the formation of the cells : 



also the distribution of the avicularium. 



5. Higher portion regenerated. 



6. Higher portion with regenerated hydrse and avicularium. 



7. Higher portion regenerated with hydra. 



8. Hydra. 



9. Hydra. 



10. Section generating descending shoots. 



11. Section with hydrse, globular substance on the cells, and 



avicularia. 



12. Avicularium in repose. 



13. Avicularium active. 



All the figures except the first are enlarged. 



§ 4. Cellularia ciliata — Ciliated Coralline. — Plate XL VII. — 

 None of the numerous tribe of Corallines can exceed the symmetry, 

 elegance, and beauty of this interesting product waving amidst the waters. 

 The singularity of its partg and proportions, seem to have originated with 

 the vigorous efforts of a sportive organic nature. 



The general appearance of the Ciliated Coralline is a minute and 

 nearly circular fan, sustained by an undulatory stalk, with a slight recur- 

 vature from its weight and expansion. — PL XLVII. fig. 1. ; fig. 2. en- 

 larged. 



It seldom surpasses nine lines in height, and is somewhat less in diver- 

 gence. At a considerable distance above the root the stem cleaves into 

 two boughs, each of these into two branches, and every branch into two 

 parts. Thence the arrangement is strictly dichotomous, or by successive 

 cleaving in two. — Figs. 3, 4. An harmonious and admirable symmetry re- 

 sults from this simplicity, and the subdivision advances still farther, though 

 the ultimate distribution of the minuter component parts becomes inde- 

 finite. 



Each of all the multitude of parts is bordered by a double row of 

 cells in alternate arrangement. The orifice of the cell is elliptical, and 



