270 



GENERAL ZOOLOGY 



their development in the autumn and complete it in the 

 spring. It is a self-evident fact, in this instance at least, 

 that death is a benefit, not only to all other forms of sea life, 

 but even to the race of Aurelia itself. The adults swallow 

 everything that can be taken into the mouth, but probably 

 their most abundant food is small pelagic Crustacea similar 

 to Cyclops (Fig. 75). 



The class of which Aurelia flavidula is a representative is 

 called Scyphozo'a (Gr. skyphos, cup ; zoa, animals). 



FIG. 135. Photograph of Comb-Jelly. Enlarged 



The Comb-Jelly. The species of "comb-jelly," or "sea- 

 walnut," shown in Fig. 135 (Pleurobrach'ia rlwdodac'tyla), 

 is found in the colder seasons floating at the surface along 

 the North Atlantic coast. It is about as large as a hazelnut, 

 but greater in diameter vertically than tranversely. 



