Papers from the Marine Biological Laboratory at Tortugas. 



37 



in tables 4 to 6. In all these tables the rate is reduced to 100 per minute 

 in natural sea-water in order to facilitate comparisons. Thus, if on the 

 average the medusae actually pulsated at the rate of 80 per minute in natural 

 sea-water, and at 40 per minute in some other solution, these numbers would 

 become 100 and 50, respectively, in the tables. 



Sea water 



2.'?C. 



75 sea wa,ter+ 25 disti tied water 

 5 sea. water. + ^o disti-Uecl wate*' 



2. 7'% C. 



30. S - 31 



2 7.% C. 



vA/^jWTv' 



7S sea, water. + 2S aiifvUea watev^ 

 75 sea wd-ter -Y Z5 dJstULed. water 

 sea.' Wit'eV 



sea vyatef 

 sea. water 





2^.7 



Fig. 3. 

 Table 4 shows the relative rates of nerve-conduction in 20 rings, and of 

 pulsation in 4 normal medusae of Cassiopea xamachana in sea-water and sea- 

 water diluted with distilled water at 29 to 31 C. 



Table 4. 



1 See record, fig. 3 



