68 



Plate III. 



'ig. 15. Five months old polyp, with bud just foi'tning. 

 " 16. ThG same, bud 8 hours old. "Ret, ectoderm. 

 " 17. " " " one day old, pear-shaped 

 " 18 " " " three days old. Endoderm isolated 

 from parent by constriction of ectoderm- 

 19. The same bud, four days old, ready to be detached; 

 showing interradial position on parent 



" 20, Another individual, bud in process of detachment, 

 showing elongated ectadermal isthmus, 



" 21, The same, lb -ainutes later. Bud settling on former 



distal end, 

 " 22. Detached larva, after three days of free- swimming 



planula life, just attached. Showing nematocysts, 



" 23, The same, four days later; basal ectoderm much 

 thickened, coelenteron developed, 



" 24, Larva 23 days old, exhibiting transverse fission of 

 coelenteron and elongated hydrocaulus, 



" 25. Young medusa with 12 tentacles and 4 sense-organs; 



