THE BEHAVIOR OF LIMPETS 



393 



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2 P.M. 



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Fig. 2. — Graph of the path followed by an individual of Acmea spectrum during a 



period of 28 days. Readings once a day. 

 Fig. 2A.-Shows the extent to which the same limpet moved during a seven hour 



period on the 14th day. 



derings. During the 28 days over which the observations ex- 

 tended, two principal spots were occupied. Both were small 

 depressions in the rock surface, into which the shell of the 

 limpet fitted rather snugly. Figure 2 A indicates the extent 

 of this animal's movements during a seven-hour period of obser- 

 vation on March 9, which was the 14th day shown in Figure 1. 

 Note that the limpet left the depression for only one hour and 

 that during this time it moved out and back, along a path which 

 represents an egg-shaped oval. 



