The Development of Scyphomeclusse. 



247 



months or throughout the entire winter season. The senior 

 author has taken polyps of Aurelia undergoing strobilation and 

 giving birth to ephyrse during the month of April in a locality 

 where during the former summer he had kept some of the same 

 brood of polyps under constant observation for a period of more 

 than a month without finding any sign of metamorphosis. This 



Sketch (camera) of colony in watch-glass, showing various phases from 

 planula; to scyphistoma. 



is in confirmation of the observations of Agassiz (op. cit. p. 77), 

 who reports strobilation as occurring in the month of February 

 and March. 



The polyps feed readily upon various minute organisms, such 

 as larvae of echinoderms, copepods, etc., and in the aquarium 

 have been found to turn cannibal and devour planula?, instances 

 of which we have found several times, in a few cases having wit- 



JOUHNAL OF MORPHOLOGY — VOI.. 21, NO. 2. 



