PLATE 59. 

 Figures I to 10 are of Linuche unguiculata; figure 1 1 is of Linuche aquila. 



Fig. I. Side view of mature medusa. Key West, Florida, June I, 1897. 

 Fig. 2. Side view of bell of mature medusa showing sculpturing of the exum- 



brella. Tortugas, Florida, May 12, 1906. 

 Fig. 3. Oral view of an ephyra 2 mm. in diameter. Nassau Harbor, Bahamas, 



March 10, 1893. 



Fig. 4. Marginal sense-organ of the ephyra shown in figure 3. 

 Fig. 5. Oral view of an ephyra 7 mm. in diameter, showing the 4 pairs of 



gonads beginning to develop on both sides of each perradius, and 



masses of brown cells. Ragged Islands, Bahamas, April 5, 1907. 

 Fig. 6. The mouth-parts of the ephyra shown in figure 5. Showing gonads 



and gastric cirri. 

 Fig. 7. Oral view of mature medusa, showing the subumbrella saccules. 



Tortugas, Florida, May 8, 1907. 

 Fig. 8. Oral view of a mature medusa, showing the 16 radial pouches of the 



central stomach. There is no marginal ring-canal. 

 Fig. 9. Marginal sense-organ of a mature medusa. 

 Fig. 10. Side view of an ephyra 3 mm. in diameter, showing the beginning of 



the tentacles. Nassau Harbor, Bahamas, March 14, 1893. 

 Fig. II. Linuche aquila, Wailangilala Atoll, Fiji Islands, South Pacific, 



November 20, 1897. 



Drawn from life, by the author. 



