222 



CCELENTERATA 



/ / II 



II 



FIG. 186. Ulmaris prototypits (from Hatschek). /, radii of first order (perradii); 

 77, radii of second order (interradii) ; /, marginal lobes; o, oral lobes (cut away on right 

 side) ; t, tentacles (adradial) ; the gonads (right side) are interradial. 





< 





FiG. 187. Polydoniafrondosa* and one of its branching oral lobes, showing the closed 



grooves (.<;) (after Agassiz). 



