210 



CCELENTERATA 



Fig. 171. — Campaimlan'ii jnhiisloiii (after AUman). a, hyilranth ^^ith liyilro- 

 theca; b, retracted; </, hydrocaulus; /', ,t;onolheca, with blaslostyle anil medusa buds; 

 (;, free medusa. The hydrorhiza is shown as tlie creeping portion from which the 

 hydrocauU and gonotlrecie arise. 



Fig. 172. — Section of liudciidrium riiiiinsniii. rk. eclodcrm; cii, entoderm; />, pcrlsarc; 



i', suii[iorting layer. 



