148 ZOOPHYTES. 



Nine appeared on March 21 ; ten on the 23d ; eleven on the 24th ; but 

 none on the 26th. The branch c, d, was decaying on April 17, and had 

 perished on the 30th. 



Probably the stem had been mutilated of a higher portion than b, 

 previous to my acquiring it. At this point, a new organization, proving 

 to be two originating buds, appeared on May 3, and one of them displayed 

 a hydra on the 6th. Thus, at least 58 days from the commencement of 

 observation had been required for the evolution of this new animal. 



Other two were displayed on May 9 and 11 :, AU three,/ g, h, mani- 

 fested great vigour : and they subsisted until the 23d. Next day, the 

 24th, h still appeared. Thus the preceding hydrse survived about 14 days, 

 none of them being displayed afterwards. 



But, in the close, a new germination proving a hydra, was unexpec- 

 tedly generated from the cell, i, near the root of the main stem, which 

 contiimed flourishing until June 9. The higher portion was now in 

 decay.* 



Regeneration of the hydrae also ensued in another specimen. 



PI. XXII. fig. 14. On April 4, this consisted of a single stem, rising 

 about six lines, with ten hydrse displayed, besides two cells, a, b, then va- 

 cant. Likewise a bud, consisting of two embryos, was far advanced at 

 the summit, and these were displayed as perfect hydr« before the 16th. 



Next, the cell b, previously vacant, generated a hydra, c, which, along 

 with that above it, had decayed on June 9 ; and the upper portion of the 

 stem folded down in decay over the lower portion. 



While in this state, a regeneration of the stem shot up through an 

 aperture in the fold. A new hydra also issued from one of the old cells, d. 



The forking of two buds appeared at the summit of the regenerated 

 stem, on July 11 ; they were flourishing along with a third on the 18th, 

 and a fourth was displayed on the 26th. 



During survivance of the regenerations above, vitality seemed extinct 

 below : Nevertheless, a new hydra issued from e, the highest but one of 



* The latest regenerations may not be represented if the drawings were completed 

 previously. The subjects are represented aa appearing at the date of their execution. 



