74 



PALMER 



FIGURE 2. 



9.02 Naviada gibba at i A. 



g.05 " " " 2 A. 



9.08 Another Naviada at i B. 



9. 1 1 The same at 2 B. 



9.14 " " " 3 B. 



9.17 " " " 4 B. 



9.20 " " " 4 B. Rested three minutes. 



9.23 " " " 5 B. 



9.26 Disappeared Did not return by 9.30. 



Experiment V. — (Figure 3). Amount having been in 

 darkness about one half hour, a Navicida gibha was observed 



