Plate 57. 



Fig. I. Carybdea xaymacana, young medusa. Nematocyst-warts so promi- 

 nent in young medusa (fig. 5, plate 56) are beginning to disappear. 

 Nassau Harbor, Bahamas, June, 1903. 



Fig. 2. Tamoya hapJonrma, natural size. Mature medusa dredged from a 

 depth of 2 fathoms off Brown's Point, Great Peconic Bay, Long 

 Island, New York, September 5, 1902. 



Fig. 2'. Tamoya haphnema. Quadrant of bell-margin showing velar canals. 



Fig. 2". Tamoya haphnema. Sense-club showing side that is directed inward 

 toward the interior of the bell-cavity. 



Fig. 2'". Tamoya haplonema. Side view of sense-club. 



Fi<T. 3. Chiropsalmus cjuadrumanus, 0.66 natural size. Fish Commission 

 Laboratory, Beaufort, North Carolina. From the bottom off 

 Beaufort entrance at a depth of 3 to 9 fathoms, July, 1904. 



Drawn from nature, by the author. 



