' tions of the margin. 



Fig. 23. Moutli parts of a young medusa in the Aurosa 

 stage. 



Fig. 24. Oral disk of an older specimen. 



Fig. 25, One of the oral arms from the same specimen. 



Fig. 26. Floor of the stomach and the ornl arms of an a- 

 dult viewed from the ah oral side. The roof of one subgenital 

 cavity is removed and a thread is represented as passing thro' 

 the external orifice into this cavity. 



Fig. 27. Section of a young bud. x 313. 



Fig. 28. Section through the distal apex of an older bud 

 showir^g the origin of a septal muscle. Zeiss H oc.2. 



Fig. 29. Longitudinal section of a planula-like larva. 

 Zeiss DD oc.2. D was the distal,? the proximal end before 

 it was set free. 



Fig. 30. Adradial section of a scyphistoma of tht same 

 age as Fig. 9. Zeiss DD oc.2. 



Fig. 31. A tangential section of the same larva showing 

 the connection of a septal muscle with the circumoral disk. 

 Zeiss H. oc.2. 



Figs. 32 to 34 are consecutive transverse sections of one 

 individual. Fig. 32 shows the continuity between the ento- 



76 - 



