PLATE 5 



EXPLANATION OF FIGURES 



Hybocodon prolifer 



41 Cells of tentacle bulb of medusa to show the character of the ectoderm 

 and entoderm; ectoderm to the left. X 615. 



42 Transverse section through radial canal of female medusa, near the aboral 

 side of the bell. Entoderm and jelly shaded, ectoderm not shaded and cells 

 not outlined. X 615. 



43 Longitudinal section of radial canal in the lower part of its course. With- 

 in the canal solid bodies, cellular in origin, in a state of disintegration. X 615. 



44 Transverse section of radial canal near its exit from the stomach. Within 

 the canal is a cell of some sort. Only the entoderm shaded in figure. X 615. 



45 to 48 Various stages in the early development of secondary medusa buds. 

 Figure 47 X 535, others X 290. 



638 



