Plate 74. 



Fig. I. Rhopilema verriUii, 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 vernllii. Marginal sense-organ seen from the e.xumhrella 

 side, showing the sensory pit in the e.\umbrella above the club. 

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



Fig. 2. Cramhiotic cooktt, 0.66 natural size. Agassiz Expedition to the Cirear 

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



For figure 2 see page 677. 



Drawn from life, b\- the author. 



