Plate 49. 

 Fig. 1. Rhopalonema clavigerum, male medusa. Tortugas, Florida, May 



29, 1906. (See page 382.) 

 Fig. 1'. Rhopalonema clavigerum. Aboral view of the medusa shown in 



figure 1, showing the sequence in arrangement of tentacles and 



lithocysts. 

 Fig. 1". Rhopalonema clavigerum. Enlarged view of one of the marginal 



lithocysts. 

 Fig. 2. Aglantha digitale, mature female. Eastport, Maine, August 20, 



1897. (See page 402.) 

 Fig. 2'. Aglantha digitale. One of the marginal lithocyst-clubs. 

 Fig. 3. Aglaura hemistoma, female specimen with moderately long peduncle. 



Tortugas, Florida, July 6, 1907. 

 Fig. 4. Aglaura hemistoma, male. Tortugas, Florida, June, 1898. Medusa 



with peduncle of intermediate length and with wide bell. 

 Fig. 5. Aglaura hemistoma, male. Nassau Harbor, Bahamas, March 18, 



1893. Medusa with long, narrow bell and short peduncle. 

 Fig. 6. Aglaura hemistoma. Extremity of one of the tentacles from the 



medusa shown in figure 3. 

 Fig. 7. Aglaura hemistoma, marginal lithocyst-club. 



Drawn from life, by the author. 



