392 



MORRIS M. WELLS 



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FIG. 1. — Graph of the movements of a non-homing individual of Acmea spectrum. 

 Observations made once a day for 27 daj's. 



Fig. lA.-Graph of the movements of the limpet whose path is shown in Fig. 1. 

 The movements shown in Fig. 1a took place on the 15th day. Read- 

 ings hourly. 



yet it is actually part of the path travelled between the 15th 

 and 16th readings. It is evident that the limpets move about 

 a great deal more than the graph (Fig. 1) would lead us to 

 believe. However, the fact remains that this partictilar limpet 

 showed no signs of homing, during the period of observation. 



Figure 2 indicates the behavior of another individual of Acmea 

 spectrum; this individual was situated upon the same flat rock 

 with the individual discussed above and several times the two 

 animals were but a few inches apart. Figure 2, however, shows 

 a very different type of behavior from that indicated in Fig. 1. 



The limpet, whose path is traced in Fig. 2, shows a marked 

 tendency to return to some particular spot, after its daily wan- 



