94 



BTDROZOA. 



ported on the curiously modified gonoblastidia, 

 whose structure has previously been described. 

 Among the Camijpanulariadce they frequently 

 assume the form of free-swimming medusoids; 



Fig. 19. 



Morphology of Canpanulaeiad^ : —a, Laomedea neglecta ; h, 

 portion of the same ; c, gonoblastidium of Campamdaria vohebi- 

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

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

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



but in the Sertulariadce seldom, if ever, become 

 detached. » 



In some Plumidaricv the gonophores appear to 

 be naked. In P. cristata the branch bearing 

 these organs undergoes a curious metamorphosis 



