11. SCYPUOZOA. 



t I 11 



247 



H 



FIG. 193. Ulmaris prototypus. (From Hatschek.) 7, radii of first order (perradii); 

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

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



FIG. 194. Polyclonia frondnsa * and one of its branching oral lobes, showing the 

 closed grooves (s). (After Agassiz ) 



