Plate IV. 



Fig. 16. — Portion of an ephyra-lobe of Cj/anea citrea. Natural size. 



Fig. 17. — Canals in a concentric muscular ridge of Gyanea citrea. Magnified. 



Fig. 18. — Portion of an ephyra-lobe of GyoMea purpurea. \ natural size. 



Fig. 19. — Canals in a concentric muscular ridge of Cyanea purpurea. 

 Magnified. 



Fig. 20. — Parumhrosa polylohata. \ natural size. 



Fig. 21. — Longitudinal section of Parumhrosa polylohata through an inter- 

 radial plane. \ natural size. 



Fig. 22. — Longitudinal section of Parumhrosa p)olyIohata through a per- 

 radial plane. ^ natural size. 



Fig. 23. — Parumhrosa polylohata, seen from oral side, showing oral tube, 

 genital glands, vascular system, etc. Natural size. 



