11 YDS A 



269 



with a free-swimming one, we have here an alternation of gen- 

 erations. In other cases the jellyfish is formed but never sepa- 

 rated from the parent, and the eggs develop in the bud. In still 



Fig. 259. — BougainviUca ramosa. A, entire colony, natural size; B, por- 

 tion of the same magnified ; C, immature medusa ; cirx, circular canal ; 

 cu, cuticle or perisarc ; ent.cav., enteric cavity ; hyd, polyp "or hydranth ; 

 t^yP^ hypo.stome or manubrium ; med, medusa ; mnh, manubrium ; rad.c, 

 radial canal; t, tentacle: v, velum. From Parker's "Biology'," after 

 Allman. This is closely allied to the New England B. supercilians. 



