204 MANTON COPELAND 
other stick. Accordingly, when the apparatus was in position, 
and the snail moving, the baited bag was always in advance and 
lateral to the end of the siphon, and was balanced by the cheese 
cloth ball on the other side. When the siphon was swung to the 
right and left the packets were carried with it, and any dis- 
turbance in the water produced by their movement must have 
been the same on both sides of the siphon. From one packet, 
however, there occurred a continuous emanation of odorous 
material from the contained oyster meat, and although it must 
have been more or less diffused over the greater part of the arc 
described by the moving siphon, the most concentrated stimu- 
lating substance was continually ahead and to one side of the end 
of the siphon. , 
Accordingly if, as it appears, Busycon finds distant food by 
proceeding in the direction in which the siphon points when it 
receives the scent or the strongest scent emanating from it, the 
animal would be expected to circle to the right when the baited 
bag was on the stick directed to the right, and vice versa. 
Table 2, indicating the results of eleven trials involving six 
individuals, shows conclusively that the snails circle in the 
direction of the bag containing the oyster. Only in one instance 
TABLE 2 
Showing the direction in which snails turned when cheese cloth containing oyster 
meat was tied to the end of a stick fastened to the shell siphon so that the packet 
was beyond and on the right or left of the tip of the pallial siphon 
= | = = i EOSLTLON OF DIRECTION 
TRIAL NO. DATE ANIMAL NUMBER Bae TURNED 
1 August 3 1 On the left To the left 
2 August 3 1 Right Right 
3 August 3 2 Right Right 
4 August 4 1 Left Right 
5 | August 5 2 Left Left 
6 August 6 3 Right Right 
ii August 7 4 Right Right 
8 August 10 5 Right Right 
9 August 10 5 Left Left 
10! August 11 5 Left Left 
11 August 18 6 Right Right 
1 The snail was without tentacles in this trial. 
