Fig. 1. — The entire Medusa, twice the natural size, seen half from the side, half from 

 below. The quadrangular oesophagus, winch hangs from the middle of the umbrella 

 cavity, is wide opened below. The four radial canals, whose pinnated proximal halves 

 bear the genitalia, spring, with a conical enlargement, at the base of the oesophagus. 

 The numerous tentacles at the umbrella margin are rolled together near their ends into 

 delicate festoons. 



Fig. 2. — The entire Medusa, twice the natural size, seen from below. Through the 

 wide open central mouth, whose free margin (al) is irregularly lobed, we can look into 

 the quadrangular cavity (gc) in whose quadratic fundus the rectangular cross of the 

 central ciliated groove is visible (gs). Four conical funnels (ch) passing immediately 

 into the four perradial canals (cr) run out from the four corners of the bottom of the 

 stomach. The proximal part of the radial canals is occupied by the genitalia, whose 

 pinnated leaves are delicately lobed beneath (s). t Tentacles. ob Marginal clubs. 

 v Velum, w Subumbrella. u Umbrella. 



Fig. 3. — Part of the umbrella margin, three times the natural size. v Velum. 

 w Subumbrella. u Gelatinous disc, e Exumbrella. tb Basal bulbs of the tentacles, 

 ob Marginal clubs. 



Fig. 5. — A genitalium, seen from above, from the umbral surface, three times the 

 natural size, cp Peripheric part of the radial canal, s Pinnated branches of the 

 radial canals, leading into the cavities of the reproductive leaves. 



Fig. 6. — A genitalium, seen from below, from the subumbral surface, three times 

 the natural size, cp Peripheric part of the radial canal, ck Conical basal part of the 

 radial canal, s Reproductive leaf, g Gastral cavity. 



Fig. 7. — Cruciate ciliated groove in the bottom of the stomach (on the gastral surface 

 of the gelatinous umbrella, u), twice the natural size. It is amphithect here (not regular 

 as in fig. 2). The four limbs of the cross, touch each other in pairs and the two pairs are 

 connected like an H by a transverse grove. 



Fig. 8. — A marginal club (cordylis, olfactory club 1) in longitudinal section, ten times 

 the natural size, cy Narrow central canal, h High cylindrical cells of the endoderm 

 q Flat sense cells of the ectoderm. z Supporting plate or fulcra! lamella (fultura) 

 between the two layers of cells. 



