PLATE IV. 



Class CO3LENTEBATA con<mMee?. 



HYDROZOA continued. 

 THE JELLY-FISH (Aurelia aurita). 



FIG. 1. AURELIA : SIDE VIEW, x 1. 



. mouth-tentacles : in. t. marginal tentacles : s. sense organ : *g. 

 genital sac. 



FIG. 2. AURELIA : DORSAL VIEW, x 1. 



s. position of stomach : r. radial canal : c. circular canal : s. o. sense 

 organ : g. genital sac. 



FIG. 3. AURELIA : VENTRAL VIEW, x 1|. 



t. tentacles : o. opening of sub-genital pit : /. genital frill. 



FIG. 4. LONGITUDINAL VERTICAL SECTION THROUGH THE GENITAL POUCHES. 

 x 1. 



g. gastric cavity : o. genital organ : p. opening into the sub-genital 

 pit. 



FIG. 5. AURELIA : LIFE HISTORY. (After Sars). 



a. free swimming embryo : 1. scyphistoma stage : c., d. strobila stage : 

 e.,f. ephyra stage, developing through g. and h. into the 

 mature Aurelia. 



