74 



Papers from the Marine Biological Laboratory at Tortugas. 



2 medusae of Cassiopea starved in 

 running water in diffuse day-light 



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9 10 U 12 13 14 15 16 17 18 19 20 21 22 23 24 25 

 Days X 

 Diagram illustrating Table 15, 



Table i6 shows the decline in weight of two medusae of Cassiopea 

 xamachana starved 9 days in the dark in constantly changing, filtered sea- 

 water at temperatures ranging from 27.3° to 30.1° C, at Tortugas, Florida, 

 from July 10 to 19, 191 1. Compare this with table 15. 



Table 16. 



medusae of Cassiopea starved 

 i dark in running water 



'According to formula y = 51(1 — 0.165)*. 



2 According to formula y = 36.37(1 — 0.18s)'. 



' Medusa C did not begin to lose weight until after 

 it had been confined 24 hours in the dark. The com- 

 mensal plant-cells seem to be of no aid to the medusa 

 when in pure, constantly changing sea-water. The me- 

 dusae live, in nature, only in semi-stagnant salt lagoons. 



0123456789 

 Days X 

 Diagram illustrating Table 16. 



Table 17. 



' According to the formula y = so (i — 0.0SS3)*. 

 * According to the formula y = 40.5(1 — 0.0559)*. 



» According to the formula y = 35.8 (1 — 0.0S7)*' 

 * Probably an error. 



