BY R. VON LENDENFELD, PH.D. 309 



which possesses eight accessory marginal bodies besides the eight 

 persistent ones. (Fig. 2.) The flaps of the Umbrella margin 

 adjacent to these ad radial marginal bodies grow out to greater 

 length and commence to divide into two flaps by fission. 



Larvae, with a diameter of 50 mm., loose these adradial bodies 

 also (fig 3), and by a continued fission of the maginal flaps the 

 configuration of the Umbrella margin of the adult animal is 

 attained. 



Such a formation of marginal bodies has, to my knowledge, not 

 been observed before, and tends to prove the great fundamental 

 difference between these Scyphomedusse which have more marginal 

 bodies in the young than in the adult state, and Hydromedusse, 

 which often possess fewer sense-organs, when young, than when 

 grown up. 



Explanation of Plate. 



Plate V.— Part of the Umbrella margin of Phyllorhiza punctata, all 

 enlarged so as to be of the same size. 



Fig. 1. Larva with 15 mm. diameter. 



Fig. 2. Larva with 30 mm. diameter. 



Fig. 3. Larva with 50 mm. diameter. 



Fig. 4. Adult with 250 mm. diameter. 



