PLATE 22. 



Fig. i. Disi'jiifinti tiirriJa, mature male. Tortugas, Florida, June 21, 1907. 

 Figs, i to 4. LnrjJici-a cruciatn (" calcarata"). Successive stages in the 



development ot' the medusa. Agassiz Laboratory, Newport, 



Rhode Island. |une to September, 1892. 

 Fig. 5. Laodiccn cntciata ("calcarata"). Part ot" the hell-margin of the 



medusa shown in figure 4. 

 Fig. 6. Laodicfii iriiciritii ("i nlcanita " ). Details of the gonads and manu- 



bnum of the medusa shown in figure 4. 

 Fig. "J. Staurodiscus tctnistaunis, young medusa. Charleston Harbor, South 



Carolina, September 14, 1897. 

 Fig. 8. Staurodiscus ti-ti-astunnis, young medusa. A sense-club from the 



bell-margin. 



See page I in tor description ot figure I. 

 Drawn from life, by the author. 



