a4 ZOOPHYTES. 



of remarkable permanence. It flourished with 17 tentacula on the 7th 

 of December, and was delineated on the 10th. — Fig. 11. On the 25th 

 its approaching fall was indicated by separation of the neck from the 

 internal pith of the stalk, after which, vacuities and transparency prov- 

 ing the exhaustion of the reproductive principle, farther observation on 

 this section B was abandoned on January 15. or in very nearly one year 

 and two months from the 22d of November. 



The heads obtained by this experiment from the section B, originally 

 the lower half of the stalk A, were seven. 



As the energies above of the section B had ceased, an inch and a half, 

 C was sundered from its lower extremity. 



Thus the original stem, first sundered on November 22. had been now 



, sundered into three portions. A, B, C, of which the intervals follow. A 



was sundered 22d November ; B cut off it in 84 days, and C cut off B 



333 days afterwards. Therefore the separation of C was 417 days after 



the portion B B had been originally removed. 



This last section, C, being laid horizontally at the bottom of a narrow 

 cylindrical vessel, a head with 19 tentacula rose at right angles from it in 

 the subsequent February, within a month of the division. — PI. IV. fig. 14. 

 It fell on the 25th of the same month, when an embryo next ascending 

 the stalk decayed on March 13. without evolution. Howsoever, a head 

 with 25 tentacula developed on the 9th of April, and subsisted three days. 

 Now, the new shoot extending an inch and a half, produced a vigorous 

 head with 20 tentacula on May 24. which fell on the 3d of June. — PL IV. 

 fig. 15. Supervening transparence induced me to abandon this section C 

 on the first of October, after having generated three heads and one em- 

 bryo, as above specified. 



But a remarkable incident had followed the separation of C, fig. 14, 

 from B, figs. 10, 11, of which figures it was the lower portion. The sum- 

 mit of B, fig. 12, was vacant at a, when C, fig. 14, was separated from it ; 

 and the headless portion consisted oi ah only. Nearly three weeks after- 

 wards a shoot bearing a hydra, c, was generated from b, the lower extre- 

 mity of B, and on February 11. was rising upwards by a very regular cur- 

 vature. B had been suspended by a silk thread in a jar of sea-water. 



