94 



HYDROZOA 



ported on the curiously modified gonoblastidia 



whose structure has 



Among 



previously been described. 

 the Campanulariadce they frequently 

 assume the form of free-swimming medusoids' 



Fig. 19. 



a, Laomedea neglecta ; b, 



Morphology of Canpanulariadje : — 



portion of the same ; c, gonoblastidium ^ _„^,^, >„ v 



lis ; d, gonoblastidium of C. Johnstoni ; e, gonoblastidium of 

 C. symnga ; f, the same in an earlier stage ; g, upper portion of 

 e, slightly compressed. (All, except a, magnified.) 



but in the Sertulariacke seldom, if ever, become 



detached. 



Plum 



be naked. In P. cristata the branch bearing 

 these organs undergoes a curious metamorphosis 



