DISCOPHOR.E I AURELID^E. 5 l l 



tinct, and in this form is called Strobila, Fig, 495. At 

 length, by deeper and deeper constriction, the segments 

 become more and more isolated, and the uppermost seg- 

 ment drops off, then the next one, and so on, till each 



Fig. 495. Fig. 496. 



Fig. 494. 



Scyphostoma of A.jftavt- 



dula, Per. & LeS. 



Magnified about seven 



diameters. 



Strobila of A. flavidula, 

 Per. & LeS. Magnified 

 about seven diameters. 



Fig. 497. 



Strobila of A.flavidula, Per. & LeS 

 Magnified fifteen diameters 



Aurelia flavidnla, Per. & LeS. Offspring of Figs. 494- 496. 



segment or disk has separated from the one below itself; 

 and the base, having reproduced tentacles, remains still 

 alive. Each segment or disk, as it separates, turns over, 

 and floats away, and in this form is known as Ephyra. 



