THE HYDROMEDUSAE 



a' 



cc 



Fio. 46. 



Fio. 45. 



ier; ; m, nectopnore ; o, onnce lormea oy tne margin or wie umorena ; t, hydrophyllia ; n, 

 ozooid ; i, tentacles ; g, sporosacs. (From Gegenbaur.) 



.Diagram of the structure of a Diphyid. C, coenosarc carrying cormidia ; CC, cir- 

 canal of nectophore ; H, hydroecium ; N', upper, and N", lower, nectophore ; P, pedicle 



45. Fhysophora hydrostatica. a, stem or corni of the colony ; a', pneumatophore (air- 

 bladder) ; ?)i, nectophore ; o, orifice fonued by the margin of the umbrella ; t, hydrophyllia ; n. 

 gastrozooid ' ' x 



4(5.- 



cular canal of nectophore 



of lower nectophore RC, radial canals of necto'phore ; SO, somatocyst/ (Modified from 

 Haeckel.) 



47. Diagram of the structure of an Ersaeome (free monogastric generation of a Diphyid). 

 G, gastrozooid ; H, hydrophylliuiu ; M, sexual medusoids ; N, nectophore ; OL, oleocyst ; 

 T, tentacle of gastrozooid. (Modified from Haeckel.) 



17 



