94 



E. PERCIVAIi 



constriction are four ostia which usually remain to form the 

 gastral ring-sinus of the scyphistoma. 



The proboscis of the polyp develops in a manner similar to 

 that of an ephyra, but there is evidence of the formation of a 

 proboscis ring-sinus such as Claus has described for the ephyra. 

 The edge of the proboscis curls outwards but the opening 

 is much wider than that in an ephyra. The passage of the 



Text-fio. 3. 



Interradius Hrradius 1^ 



Before liberation of last ephyra. Polyp complete. 



connecting strands direct to the gastral wall of the enteron 

 and unconnected with the wall of the oral opening was seen 

 in only one case. Such a condition (which it will be remembered 

 Heric regards as normal in Chrysaora) is probably accidental, 

 and may be described in Aureha as abnormal. In a case of 

 this kind there are no septal ostia and so no gastral ring-sinus. 

 The upper portion of the enteron is as entire as in the free 

 ephyra. Usually the columellae persist and the resulting polyp 

 possesses all the features of the original scyphistoma from which 

 it has been formed (Text-fig. 3). 



As far as has been ascertained the peristomial pit of the 



