98 ZOOPHYTES. 



10. A group consisting of the parent, a, and its progeny of 



four still connected with the body.— ilfay 8. 



11. The same, with a sixth hydra originating.— ilf ay 15. 



12. A hydra, a, with indications of reproduction. — June 26. 



13. The same, the reproduction having advanced. — July 3. 



14. The same hydra, a, now the lowest of the group, all the 



progeny being above it. — Sept. 1. 



15. A specimen, a, which was single in the middle of October, 



represented shortly afterwards in an intermediate stage, 

 fig. 19 ; and as now seen with its progeny, generated sub- 

 sequently. — March 1. 



16. A hydra gorged with food, the tentacula contracted. 



17. A hydra adhering to the bottom of a vessel. Distorted 



prominences announce reproduction. 



18. The same, farther advanced. 



19. The colony represented fig. 15, here seen in an intermediate 



stage, between October, when there was only a single 

 hydra, and the month of April subsequent. 



20. Colony generating from a hydra. 



Plate XIV. Fig. 1. Colony of the Hydra tula occupying the concave frag- 

 ment of an old shell of the Solen siliqua. The hydra, a, had 

 been previously mutilated of the upper half, which was at 

 this date regenerated. — Feb. 13. 



2. The same colony multiplied and dispersed. — March 12. 



3. Another colony on the convexity of the shell, derived from 



the former, fig. 1. — March 12. 



Here the specimens a and b were selected for experi- 

 ment. 



4. The specimen a, just referred to, as in fig. 3, viewed sepa- 



rately as on that selection. — March 12. 



5. Stump of fig. 4, remaining after the animal was bisected. — 



March 12. 



6. The same stump, fig. 5, having regenerated the upper part 



with tentacula. — March 29. 



7. Upper portion severed on March 12, from fig. 4 (originally 



fig. 3, a) as now seen on March 29. 



8. The same enlarged. 



