

FtG. 50. Aurelia aurita, development. A, planula ; B, C, formation of the gullet 

 or stomodaeum ; D, transverse section of young Scyphula ; E, Scyphula ; F, 

 longitudinal section of same; G, division of Scyphula into ephyrulae ; H. ephy- 

 rula from the side ; I, the same from beneath. In A D and F the ectoderm 

 is unshaded, the endoderm striated, and the mesogloea dotted, a. lobes of 

 umbrella ; mnb. manubrium ; mth. mouth ; s. f, septal funnel ; st. stomodaeum ; 

 /. tentacle ; tn. taenioles, or gastric ridges. (From Korschelt and Heider's 

 'Embryology, ) 



