Plate 69. 



Fig. I. Cassiopea fronJosa, young medusa, natural size. From the bottom 



of the moat of Fort Jefferson, Tortugas, Florida, July 10, 1905. 

 Fig. 2. Cassiopea fronJosa. Half of exumhrella shown on the right, and halt 



of the subumbrella on the left. Natural size. Moat of Fort 



Jefferson, Tortugas, Florida, June 23, 1907. 

 Fig. 3. Sense-organ of Cassiopea fronJosa seen from subumbrella side. 

 Fig. 4. Cassiopea xamachana, side view, natural size. From moat of Fort 



fefferson, Tortugas, Florida, July, 1905. 

 Fig. 5. The mouth-arms of Cassiopea xamachana, showing side walls of 



stomach cut across. The canal-system in the arms is shown in 



green. 

 Fig. 6. Sagittal section of Cassiopea xamachana, showing stomach cavit)'. 



The gastrovascular canals are shown in green. 

 Fig. 7. Cassiopea xamachana. One of the mouth-arms cut off so as to show 



the branching of the canal-s)stem. 

 Fig. 8. Cassiopea xamachana. Cross-section of a mouth-arm near its base 



showing the fringing tentacles of the mouths and the shapes of 



the appendages. 



Drawn from life, by the author. 



