The depression of the floor of the stomach just internal to the valve may possibly be a structure of some morphological significance. In one series of sections it was found that in two of the quadrants the depression was deeper than that represented in Fig. 4, and extended perceptibly into the outer or vertical portion of the suspensorium. Fig. 32 is a diagram giving a vertical reconstruction in the perradius of the cross-sections in which this deepened depression was noticed. Fig. 31 is a drawing (the outline by camera lucida) of one of the cross-sections, through the lowermost point of the depression. The figure gives the wall of the stomach lined with high columnar epithelium (_ens_), and the wall of the stomach pockets, with the suspensorium (_su_) connecting them. The section is taken just above the broad angle that lies between the two parts of the suspensorium, that is, in a plane parallel to the arrow _a-b_ in Fig. 32, but a little lower down. At the points to which the reference letter _x_ (Fig. 31) refers are seen the first indications of the division into two parts, _i. e._ of the apex of the angle. The next section or two lower down show the relation seen in Fig. 10 (_su_). There can be no doubt in this case that the depression or pocket lies in the outer vertical limb of the suspensorium. It is the position that gives it at least the appearance of some morphological significance. In two genera of Lucernaridæ named and described by Clark (’78), Halicyathus and Craterolophus, the mesogonia or suspensoria in all four perradii contain broad pockets. These mesogonial pockets in the Lucernaridæ have given rise to considerable misunderstanding owing to the fact that in some forms the reproductive organs bulge out from the stomach pockets in which they structurally lie, and come to take up a secondary position in the walls of the mesogonial pockets. The sections of Charybdea above referred to indicate that among the Cubomedusæ we may have the same structure reduced to its lowest terms, and may be a feather’s weight in favor of the view that the Cubomedusæ are descendants of an attached Lucernaria-like form.