234 



MANTON COPELAND AND H. L. WIEMAN. 



August 2, 



9:32:00 A. M. The water was gently stirred with a glass 

 rod and the dish kept under observation for ten minutes. The 

 worms remained in the sand. 



9:51:00. A clam (5.4 cm. in length) cut up on half shell 

 was placed in the center of the dish and the water stirred as 

 before. The worms appeared as follows: worm I at 9:52: 15, 

 seven centimeters from the edge of the dish; II at 9:53: 17; 

 III at 9:54:45; IV at 9:56:50. Worms II, III, and IV ap- 

 peared at the periphery of the dish. 



JL 



FIG. i. Illustrating the responses of worms I., II., III., and IV., described 

 in the text. The arabic numerals denote successive appearances of individual 

 worms. 



Worm I. At its first appearance it made a few wavering 

 movements with the anterior segments of its body at the mouth 



