woula be unfair to expect the hydroid buds on a hydroid to pass 

 through a planula stage or to have their entodenii produced by 

 delamination, or immigration ; while, on the other hand, there 

 is no apparent reason why after these bads are once establish- 

 ed their future development should not proceed in the sajne way 

 as in a larvae produced directly from an egg. In Gimoctantha, 

 according to Brooks (1886), the hydra-like larva produces buds 

 like itself on an aboral stolon and then all the hydras, the 

 original sexually produced ones as well as the others, pass | 

 through a metamorphosis by which they become medusae. No j 

 difference was observed between the medusae for-med fi'om hydras 

 that were produced directly from the egg and those from larvae 

 that were produced indirectly by budding, and beginning with 

 the hydra stage the steps in the development of the two sets 

 of medusae are the same. It will be seen from what follows 

 that the scyphistoma larvae of Cassiopea set free buds of a 

 yer\^ simple structure, and that when these buus have become 

 scyphistomas provided with eight tentacles they are essentially 

 like larvae at a corresponding stage that are developed from 

 the eggs of other Discomedusae. In the absence of any evi- 

 dence to the contrary, it seems fair to assume, that we have 

 here a case similar to OunoclanLha and that the subsequent de- 

 velopment of this larva is the same as that of sexually produ- 



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