GONIONEMUS 177 



The hydroid generation of Gonionemus is a minute solitary- 

 polyp which lives attached to the bottom in shallow water; 

 it will not be studied here. The polyp is only about one milli- 

 meter in height and has four tentacles which can be extended 

 two millimeters. It is thus very much smaller than the medusa, 

 which has a height of about nine millimeters and a diameter of 

 about twenty. The polyp forms new polyps by budding, but 

 has never been observed forming the medusse, so that it is not 

 known how these originate. 



