ACTINIA. '239 



VI. When in the gemmule or corpuscular state, the offspring is 

 ciliated, and endowed with the faculty of rapid motion. In metamorphos- 

 ing to the foetal state the cilia are lost, and as the young Actinia is evolved, 

 its tentacula appear, and it affixes by the base. 



VII. Certain species of the Actinia may survive during thirty years. 



EXPLANATION OF THE PLATES. 



Plate XLV. — Actinia mesembryanthemum as delineated October 1. 1828, which 

 still survives in 1848, after having been about twenty years in 

 captivity, and is conjectured to be scarcely less than thirty years 

 old. 



Plate XLVI. Fig. 1. Actinia cerasum, adult, conjectured a variety of the Me- 



sembryanthemum. 



2. Ciliated gemmules from the tentacula of the subject, 



Plate XLV. 



3. Monstrous progeny of the same subject. 



4. Monstrous specimen taken at Eyemouth. 



5. Actinia cerasum taken at Blackness Castle in 1805. 



6. Monstrous specimen produced by fig. 1. 



7. The same farther advanced, being five months old. 



8. Monstrous bases of its two bodies. 



9. Ciliated gemmules from the tentacula of fig. 1. 



10. Other ciliated gemmules from the tentacula of fig. 1. 



11. Actinia explorator. 



Plate XLVII. Fig. 1. Speckled skin of the young Actinia mesembryanthemum. 



2. Young Actinia produced by the specimen Plate XLV. 



in the seventeenth year of its captivity. 



3. Monstrous disc of a specimen having two mouths. 



4. Young Actinia mesembryanthemum artificially extracted 



from a tentaculum, profile. 



5. The same, front. 



6. The same, shewing the irregularity of the parts, which 



subsequently became symmetrical ; front enlarged. 



7. The same young when a year old. Part of the tentacula 



omitted, to shew the form and dimensions more dis- 

 tinctly. 



