DR. 1WAJI IKE DA . 



Explanton of Plate V. 



Fig. I. A full-grown hydrosome. Enlarged i 1 / a times. 



Fig. 2. A side-branch of gonosome bearing a cluster of medusoid 

 buds in various stages of development. Greatly magnified. 



Fig. 3. Semidiagrammatic representation of the median longi- 

 tudinal section of the hydranth and of a part of the hydro- 

 caulus, Greatly magnified. 



d. t., distal tentacle"; end. c, endodermal core ; g. s , gono- 

 some ; hy. c, hypostomal cavity ; 1 c . longitudinal canal of 

 hydrocaulus ; 1. gl., lymphoid gland ; 1. h. c, lower hydranth- 

 cavity ; p. t., proximal tentacle ; p. y., parenchyme ; u. h. c, 

 upper hydra nth-cavity. />-^- />«-»*,>^>n*/r»o t>»+*u^_ 



Fig. 4. A small portion of a section of the lymphoid struture of 

 an adult animal. Highly magnified. 



Fig. 5. Youngest bud observed, with four distal and seven pro- 

 ximal tentacles. 



Fig. 6. Oldest bud observed, with ten distal and seventeen pro- 

 ximal tentacles ; already provided with six gonosomal rudi- 

 ments. 



Fig. 7. Magnified view of a stained hydrocaulus close to the free 



end of hydrocaulus. 

 Fig. 8. A small portion of the median longitudinal section of the 



hydranth wall of the bud represented in Fig. 6. Highly 



magnified. 



ect, ectoderm ; end., endoderm ; 1. gl., lymphoid gland ; sp , 

 septum. 



