great numbers searches for males and for females with ripe eggs 



were equally fruitless. The great abundance of young and the 



range in their apparent ages was, therefore, surprising, until 



I founa a method of buuding in the scyphistoraas, to be desci-ib- 



ed later, which easily accounts for these phenomena. 



The full grown medusae could be kept in good condition in 

 I 

 iaquaria for a number of days and could be kept alive for weeks, 



iwhile the young medusae and scyphistomas woula thrive there an 

 indefinite time if there was a little pond ooze at the bottom 

 of the aquarium, and the v;ater was changed twice a day. In- 

 deed the growth and multiplication of the scyphistomas would 

 proceed actively under these conditions. Ey keeping the lar- 

 vae in shallow dishes I was able to watch the whole course of 

 non-sexual development, but the development from eggs remains 

 unkno^vn to me because of the impossibility of finding any that 

 woula develop. 



I shall first give a systematic description of the specieS; 

 with an account of the anatomy of the adult, and follow this 

 with what I have learned of the development, from observation 

 of the living animals while in Jamaica, and by study of sec- 

 tions of the preserved material since my return to Baltimore. 



- 4 - 



