THOMPSON: METAMORPHOSES OF HERMIT CRAB. 
183 
given as part of the figures for series A. They are separately listed 
here for comparison with the figures for the “ delay ” record. 
B 1. 
The larvae were kept three days without shells and were then 
provided with them, and they entered these within a few hours. 
One experiment, using 10 glaucothoe in the control section, all of 
which lived to the sixth stage; and 10 in the delay section, 7 of 
which attained the moult. 
Control. 
Delay. 
1 glam 10 % r’m’n’d 4 days 
8 “ 80 % “ 6 “ 
1 “ 10 % “ 5i “ 
1 glau. 14 % r’m’n’d 5 days. 
4 “ 57 % “ 5i “ 
2 “ 28 % “ o" “ 
B 2. 
The larvae were kept four days without shells and were then pro¬ 
vided with them. Three experiments, using 55 crabs in the control, 
25 of which attained the moult to the sixth stage; and about the 
same number in the delay, 22 of which reached that moult. 
Control. Delay. 
3 glau. 12 % r’m’n’d 4 days. 6 glau. 27 % r’m’n’d 5 days. 
2 “ 
OO 
41 u 
“■g 
2 “ 
9% “ 
51 “ 
19 “ 
76 % « 
5 “ 
12 “ 
55 % “ 
6 “ 
1 “ 
4% “ 
51 “ 
2 “ 
9% “ 
7 “ 
The curves that may be constructed from the percentages of these 
experiments, resemble in shape the curves for the experiments of 
series A (pi. 7, fig. 32), but have a more restricted range. The 
curve for the three days’ delay (broken line) has the mode between 
the fifth and sixth day; while that for the four days’ delay 
(dotted line) has the mode at the sixth day. The curves for the 
control experiments exactly resemble the curve plotted for series A. 
