(The following are of Charybdea, except when specially stated otherwise.)
Fig. 31. Horizontal section through the suspensorium.
Fig. 32. Diagram of a gastric ostium seen from the stomach side.
Fig. 33. Diagram of a vertical section through a gastric ostium.
Fig. 34. Diagram of a horizontal section through a gastric ostium.
Fig. 35. Diagram to illustrate the formation of the central and peripheral gastro-vascular systems of a Hydromedusa (a, b, and c) and a Cubomedusa (d).
Fig. 36. Vertical section through the upper part of the bell, adradial, to show horizontal vascular lamella.
Fig. 37. Vertical section through the perradius, to show vascular lamella of the niche of the margin.
Fig. 38. Vertical section a little to one side of the last, to show same structure.
Fig. 39. Horizontal section through the upper part of the sensory niche, to show vascular lamella of the niche.