OBJECTS CARRIED BY THE SEA-URCHIN. 453 



bouring objects, and simply neglects to drop them again. It 

 was to satisfy myself on this matter that the investigations 

 herein described were really undertaken, and it was not until 

 they had been in progress for some time that my attention 

 became fixed upon the other points explained in this paper. 

 The above-mentioned instances (pp. 447-8) in which the two 

 small Sea-Urchins covered themselves with objects in their 

 energetic and determined manner on several successive occasions 

 proves that the picking up of materials is not merely accidental or 

 incidental. There now appears to me to be little doubt that the 

 Sea-Urchin has the instinct in question. Disguise, however, is 

 probably not the only use of the objects. Another important 

 use may be the resistance which they offer to fixation upon the 

 Sea-Urchin of the everted stomach of a Starfish. 



