EXPLANATION TO PI.ATK XVII. 



l-'n;. 1. Ilijiiiiircllii li>ni/i<-ari>it Nutting. 1'art i>f liydroclndimn I enlarged i. 



'1. Jl'nifiiin-llii linii/ii-arjiii. Hydroeladia! internode (greatly enlarged). 



H. Hiinniri-Uii linii/ii-iiriHi. Phylactocarp and gonaDgia (enlarged). 



I. /'iilHi'/irpn i/nu-ilix Fi-wk.-s. I'arl of liydroi-hidiiini (enlarged i. 



">. l'Ilicnri>a gnu-ilia. 1 1 ydrocladial internode i greatly mlamrd i. 



(I. CiilHi-di-ini gnicilis rbylai'toearp (enlarged). 



7. Iliiloiili-ri^ mriiintu Allinau. I 'art of colony (enlarged). (After Allinan.) 



(<. llaloptrri.i <-<irin<il<i. Part uf hydrucladiuni, side view (greatly enlarged p. (After Allinan.) 



0. ll<ili>iiteri* i-aritialtt. Front view (if liydrothcca- (greatly enlarged). A Iti-r Allnian.) 



10. <i alt ;/<t luimilis Alltnan i enlarged i. I After Allinan. ) 



11. Ciiiti/ii Intmilia. Front view of hydrotheca (greatly enlarged i. 



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