energy they possess those few morsels which filter 

 down through the frigid water at this inclement 

 season of the year. 



3. With the advent of spring, changes occur 

 that are relatively rapid in succession. The scy- 

 phistoma increase in size : strobilization takes 

 place: soon the ephyrulcz are released and the 

 actual metamorphosis is at an end. 



4. The individual ephyrulcz are soon of the size 

 of a split pea, are quite transparent, and their 

 filmy tissues are tinted a delicate bluish-green. 

 The gonads are marked but not developed. When 

 the moon-jelly attains to the diameter of a silver 

 dime, it has acquired most of the characters that 

 distinguish the adult form. 



5. Thence onward, throughout the spring, the 

 summer months and fall, Aurelia continues to in- 

 crease in size. At the end of autumn it is more than 

 a foot across the umbrella. Still, large and bulky 

 as it may appear, it is astonishingly meager in 

 actual substance, less than five per cent, of the 

 animal being constituted of solid material. This is 

 to say that the jellyfish is nearly one hundred per 

 cent, water. 



6. Aurelia is comparatively short-lived. Seldom 



[381] 



