Plate 56. 



Fig. I. Side view o( Haliclystus salpinx, from eelgrass near Ram Island, off 



Manchester, Massachusetts, September 7, 1905. 

 Fig. 2. Oral view of medusa shown in figure I. 

 Fig. 3. Section of stalk of medusa shown in figure I. 

 Fig. 4. Side view of marginal organs of medusa shown in figure I. 

 Fig. 5. Young medusa of Caryhdea xaymacana, showing prominent nema- 



tocyst-warts over the exumbrella. Tortugas, Florida, May 24, 



1899. 

 Fig. 6. Quarter-grown medusa of Carybdea xaymacana. Nassau Harbor, 



Bahamas, March, 1893. 

 Fig. 6'. Side view of one of the sense-clubs of medusa shown in figure 6. 

 Fig. 6". Section of sense-club of medusa shown in figure 6. /, ectodermal 



lens of cup-like eye; oc, ocellus; ot, otolith. Entoderm brown, 



ectoderm gray. 

 Fig. 7. Carybdea xaymacana showing gonads; twice natural size. Nassau 



Harbor, Bahamas, April 24, 1907. 

 Fig. 7'. Side view of the sense-club of the medusa shown in figure 7. 

 Fig. 7". View of the sense-club of the medusa shown in figure 7, showing side 



that faces inward in such manner as to observe objects within the 



bell-cavity. 



Drawn from life, by the author. 



