THE BEHAVIOR OF THE SHORE-ANEMONE 311 



crease in temperature in the water rather than from the influence 

 of light. The first series of experiments was conducted on speci- 

 mens which had been kept in the laboratory for about a week, 

 in order that they might have time to become acclimated some- 

 what to laboratory conditions. The second series was, how- 

 ever, carried out on specimens allowed only one day in the 

 laboratory in order that they might become attached and nor- 

 mally expanded. The uniformly closed condition under the 

 influence of darkness was even more completely shown in these 

 individuals fresher from the sea-side. The specimens kept under 

 constant light remained persistently expanded both night and 

 day. Control experiments of individuals taken from the same 

 lots were carried on in each case, the conditions for these being 

 that of normal day and night illumination. These showed the 

 specimens to remain in each case expanded during the day, 

 and contracted during the night. 



The following record shows the results in total darkness for 

 the first two days of the second series of experiments mentioned 

 above. The results for the succeeding three days of the experi- 

 ment being the same as given for the second day, that is, all 

 closed, it is unnecessary to include these. 



November nth. 



i :oo P. M. All six fully expanded (experiment begun). 

 2 ^o " One partially contracted. 



6:00 Four well closed, one partially open, one com- 



pletely open. 

 9:30 " Five well closed, one open. 

 11 :oo " Two partially open, four closed. 



November 12th. 

 8 :oo A. M. All specimens closed 



2 :oo P. M. 



5:00 



7 :oo 



9:30 



11 :oo 



Thus in Cribrina xanthogrammica the evidence seems to point 

 towards the contraction and expansion as resulting very largely 



