PLATE 74. 



Fig. i. Rhopilema vernllii, mature medusa, 0.5 natural size. Bell shown 

 expanded. When in systole it is higher than a hemisphere. Off 

 Middletown, Pamlico Sound, North Carolina, November 16, 

 1904. 



Fig. i'. Rhopilema verr illii. Marginal sense-organ seen from the exumbrella 

 side, showing the sensory pit in the exumbrella above the club. 

 The sensory-mass is orange. There is no ocellus. 



Fig. 2. Crambione cookii, O.66 natural size. Agassiz Expedition to the Great 

 Barrier Reef, off Cooktown, Queensland, Australia; May 4, 1896. 



For figure 2 see page 677. 

 Drawn from life, by the author. 



