Plate 46. 



Fig. I. Gonionemus murbachii, from Woods Hole, Massachusetts. Profile 

 view of mature medusa, 1.25 times natural size. 



Fig. 2. Gonionemus murbachii. Oral view of the mature medusa. 



Fi°\ 3. Gonionemus murbachii. Oral view of a sector of the bell showing 

 form of gonads, tentacles, lithocysts, and tentacle-bulbs. 



Fig. 4. Aglaura hemistoma. Meridional section showing exumbrella (ex), 

 male gonad (g), circular muscles of the subumbrella (m), sub- 

 umbrella ectoderm (s), and stomach-cavity (si). (See page 398.) 



Fig. 5. Aglaura hemistoma. Meridional section of the bell showing exum- 

 brella (ex), circular muscles of the bell cut across (m), ring-canal 

 (re), subumbrella ectoderm (s), tentacle (t), and velum (v). 



Fig. 6. Cubaia aphrodite, green variety. Key West, Florida, May 27, 1897. 

 (See page 351.) 



Fig. 1 drawn from life by Mr. Hyashi. Figure 2, from life by Dr. 

 Arnold Graff. These drawings were kindly lent for reproduction by Dr. 

 Louis Murbach. Other drawings are from life, by the author. 



