F. S. CONANT ON THE CUBOMEDUS^. 11 



seen in the series of drawings that figure sections of the whole jelly-fish 

 at different levels (Figs. 6-16). Above, the bell cavity is roofed over by 

 the stomach ; below, it is open freely to the water, the opening being 

 narrowed somewhat by the diaphragm-like velarium (Fig. 3, v) ; the four 

 flat perradial sides are bounded by the walls of the four broad stomach 

 pockets, to be described when we come to the internal anatomy. 



(a) The Proboscis. From the stomach there hangs down into the 

 bell cavity the proboscis or manubrium, which consists of a short funnel- 

 shaped stalk bearing on its distal end the four mouth lobes or lips. The 

 latter are somewhat broadly V-shaped processes lying in the perradii 

 with the convexity directed outwards, and with the concavity on the 

 inside forming the beginnings of four perradial furrows that are con- 

 tinued upwards to the stomach. The four furrows are shown in the 

 stalk of the proboscis in Fig. 11, which represents a section taken a little 

 above the level of the mouth lobes. The same cross-shaped section of the 

 stalk shows the four perradial prominences or ridges overlying the 

 furrows, which are the direct continuations of the four projecting mouth 

 lobes. 



(b) The Suspensoria or Mesogonia. The stomach (leaving out of 

 consideration the proboscis) hangs down into the bell cavity as a slightly 

 sagging saucer-shaped roof (Figs. 4 and 5). In the four perradii it is 

 attached to the lateral walls of the subumbrella by four slenderly devel- 

 oped mesentery -like structures, the suspensoria or mesogonia. These are 

 simple ridges of gelatine, covered of course with the epithelium of the 

 bell cavity, which serve to keep the stomach in position much in the way 

 that a shelf is supported by brackets (Fig. 4, su). The suspensorium 

 accordingly has two parts, curved so as to lie at right angles with each 

 other : a vertical portion lying along the wall of the subumbrella, and a 

 horizontal which passes over from the vertical on to the basal wall of 

 the stomach. In Fig. 10 the suspensorium in each quadrant is shown 

 cut across just below the angle between the two parts, so that the two 

 appear in the section as projections on the wall of the stomach and on 

 the wall of the subumbrella. 



(c) The Interradial Funnels or Funnel Cavities. It will be seen at 

 once that the four suspensoria serve as partitions to divide the upper 

 portion of the bell cavity, the part that lies between the stomach and the 

 lateral walls of the subumbrella, into four compartments. These com- 

 partments extend upwards in the four interradii like inverted funnels, 

 whence their name. In the series of cross-sections they can be traced 



