Fir;. 19. 



Life history of Aurelia. a. " Hy<ha iuha" on shell (Scyphistoma stage), b, c. 

 Tile same undergoing transverse division (enlarged), d d'. Ephyra stage 

 (natural size and enlarged). e e'. Young Aurelia (natural size and 

 enlarged), p. Fully-grown Aurelia. 



To face 2). 56. 



