Plate 45. 



Fig. 1. Gonionemus murbachn. Side view of mature medusa. Eel Pond, 

 Woods Hole, Massachusetts, July 22, 1897. 



Fig. 2. Gonionemus murbachu. Oral view of a part of the bell-margin, 

 showing the insertion of a tentacle, its bulbous base, and two 

 lithocysts. 



Fig. 3. Gonionemus murbachu. Showing the outer end of a tentacle with 

 its adhesive "sucker" and sharply bent extremity. 



Fig. 4. Gonionemus murbachii. Aboral view of the mature medusa, show- 

 ing the confluence of the 4 radial-canals through an intermediate 

 vessel. 



Fig. 4. Drawn from life by Dr. Arnold Graff and presented for 

 reproduction by Dr. Louis Murbach. Other figures are from life, by the 

 author. 



