5*4 



RADIATES : ACALEPHS. 



able as a bubble, yet they perform varied and rapid move- 

 ments, contract and expand their tentacles, catch and vo- 



Fig. 499. 



Fig. 501. 



C. mtrabilis, Ag. Cluster of Hydrae 

 growing on sea-weed. 



Fig. 500. 



Coryne mirabilis, Ag. Adult. 

 Single individual of Fig. 499 enlarged, Massachusetts Bay. 



showing a, b just ready to become free 

 medusae, Fig. 501 ; c\ young bud. 



raciously devour medusas of their own kind or those of 

 other species, and other marine animals. They may be 

 seen in the spring, and in great numbers ; about the 

 middle of summer they lay their eggs and perish. But 

 these eggs, as already noticed, do not hatch medusae, like 

 the parents ; but each hatches a little hydroid, which is first 

 free, then afterwards becomes attached to a shell, or sea- 

 weed, or stone, and from this hydroid other hydroids bud 



