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 meduse, so that it is not 
known how these originate. 
