462 



RADIATA : ACALEPHJE. 



FIG. 694. 



other small jelly- 

 fish e s, and other 

 small marine ani- 

 mals and thus gives 

 abundant evidence 

 that it is a real mem- 

 ber of the animal 

 kingdom. The jelly- 

 fishes of this sort are 

 abundant in the 

 spring. In the mid- 

 dle of summer they 

 lay their eggs, and 

 perish. But the 

 eggs do not hatch 

 into inedusse like 

 the parent ; but 

 each egg hatches a 

 little hydroid which 

 is first free, then 

 afterwards becomes 

 attached to a shell, 



Sea- Weed, Or Stone, Hydroid Jelly-fish, Coryne (Sarsia) mirabilis, Agassiz. 

 T f ,i 1'ffl A' a cluster of hydroids growing on sea-weed; Q, a 



3 single individual enlarged a and 6 just ready to drop 

 hydroid Others ff an( 3 become free Jelly-fishes C- 



branch till a little community of hydroids has grown up, 

 as in Fig. 694A. 



And here again we have an illustration of Partheno- 

 genesis (page 329). 



In some kinds of Hydroids, as Tubularia (Fig. 695), 

 there is a wreath of coronal tentacles, and a projecting 

 part called a proboscis, and the medusae grow in clusters 

 from just above the coronal tentacles. 



