622 



MEDUS.E OF THE WORLD. 



Krukenberg, 1880, finds that Aurellia aurita contains 95.34 per cent of water and only 

 4.66 per cent of solid matter. 



The planula larva commonly develops into a scyphostoma which gives rise to a number 

 of ephyrae through strobilization. In aquaria, however, Haeckel, 1881, rinds that the planula 

 may develop directly into a single medusa without passing through the scyphostoma-stage.j 

 In this case the ocular lobes and tentacles grow outward around the gastrula mouth, and the 

 gelatinous substance ot the planula becomes that of the medusa. In other cases the scypho- 

 stoma develops into a single medusa which remains attached by a pedicel formed of the basal 

 part of the scyphostoma, recalling the condition observed in the Stauromedusa?. 



Herouard, 1907 (Comptes Rendus, Paris, tome 145, p. 601, Ibid., 1908, tome 147, p. 1336), 

 finds a peculiar scyphostoma in an aquarium at Roscoff, which may possibly be that of Aurel- 

 lia affected by adverse conditions of confinement, although he calls it T aeniolhydra roscof- 

 ffiisis. It develops lateral buds, and in addition to these peculiar cysts on its pedal zone. 



Synopsis of the Races or Species of Aurellia Continued. 



These are probably one and the same species and should be called Aurellia labiata 



