CNIDARIA 



117 



The Ephyra (Fig. 51, ii and 12, and Fig. 58), accordingly, 

 possesses a flat, discoid body, from the nnder-side of which 

 the manubrium hangs down. The margin is prolonged into 

 bifid marginal lobes, each one of which bears a sensory body 

 between its alar lobes. Four of these are perradial, and 

 correspond to the radii of the oral cross, whereas the four 

 interradial ones fall in the radii of the "^astral filaments. The 



Fig. 58.— Diajjrammatic figure of an embryo of an Ephyra. 0, cruciform mouth- 

 opening ; gf, gastral filaments ; I, lobe-pouches ; /, alar pouches ; c, cathammata, 

 or regions of fusion of the peripheral intestine ; sh, sensory bodies. 





broad, flat gastral space is prolonged into sixteen peripheral 

 marginal pouches, which are connected by means of the 



scular plate. Of these pouches the eight perradial and 



terradial ones are directly continnous with the lobe-pouches 

 and alar pouches. The ectoderm on the oral side of the disc 

 (sub-umbrella) forms a broad, band-like circular muscle, 

 while paired longitudinal muscle-bands stretch along the 

 marginal lobes and into the alar lobes. 



Hypogenetic Development of the Larvae of Pelagia. 



Schneider (iS"o. 113) and Haeckel (No. 107) have already 



