STAUROMEDUS.B. 



521 



descended from some more highly organized forms of Scyphomedusae. Their chief reasons 

 for this belief lie in the facts that in the Lucernaridae the marginal anchors (colletocystophores) 

 are highly variable and may therefore be vestigial organs. Moreover, in Lucernaria cam- 

 panulata the marginal anchors exist in the very young medusa but disappear as development 

 proceeds and are not found in the adult. This evidence, although meager, supports the 



Synopsis of the Genera of Stauromedusa. 



