110 



MANUAL OF ZOOLOGY 



SECT. 



which extend about half-way from the centre to the circum- 

 ference. In the outer or peripheral wall of each gastric pouch 

 are three small apertures, leading into as many radial canals 



FIG. 49. Aurelia aurita. Ventral view two of the oral arms are removed ; a.r. c. 

 radial canal ; gon. gonads ; i.r.c. radial canal ; mg. //. marginal lappet ; mth. 

 mouth ; or. a. oral arm ; p.r.c. radial canal ; s.g.p. sub-genital pit ; /. 

 tentacles. 



(a.r.c., i.r.c., p.r.c.}, which pass to the edge of the umbrella 

 and then unite in a very narrow circular canal. 



