Jackson, t?ie Amphipod Byalella Knickerboclceri. 63 
were noted. The number of intervals of any given duration can 
be easily determined from the “Table of Observations upon Molt¬ 
ing." 
Of the twelve specimens which retained a cuticle for a period 
of more than twelve days only three survived. Most of the animals 
that died on account of delayed molting did so within a few hours 
after the molt was completed; three died during the molting and 
one lived four days after the molt. Four individuals which molted 
respectively in twenty-two hours, three days, four days and five 
days, each died shortly after the molt was completed. The one 
which molted in twenty-two hours is interesting. This Hyalella 
was isolated October 20th ; 
TABLE OF OBSERVATIONS UPON MOLTING. 
'd 
G 
Intervals 
(in, Days) 
GO 
s s 
REMARKS. 
■8 i 
Between Molts. 
< TO 
z; 0 
ad. .$ 
1 
21 
9 
1 
' 3 | 
ad. 9 
15 
2 I 
Died three hours after second molt. 
ad. $ 
12 
8 
3 1 
yg- 3 
9 
3 
3 | 
Died about eight hours after third molt. 
ad. $ 
10 
9 
8 
4 1 
ad. 9 
22 
hrs. 
8 
2 j 
Died two days after second molt. 
ad. 9 
.10 
6 
9 
8 
5 
w 
PJ 
ad. $ 
81 
8 
8 
4 
ad. $ 
9 
9 
9 
4 
.2 
yg- 3 
9 
8 
9 
4 
ad. 9 
8 
9 
11 
4 
U 
ad. 9 
8 
8 
8 
4 
1 
yg- 2 
12 
10 
3 
O 
ad. 9 
.11 
14 
■ i 
1 ■ 
3 
Died two days after third molt. 
G 
ad. $ 
14 
10 
3 
a 
yg- $ 
8 
10 
3 
p 
+5 
ad. $ 
9 
10 
9 
4 
P 
ad. 9 
ad.. $ 
8 
11 
13 
10 
3 
3 
Died four days after third molt. 
ad. 9 
10 
10 
3 
ad. $ 
17 
1 
Died in process of second molt. 
ad. 9 
19 
1 ' 
12 
Died six hours after secpnd molt. 
ad. 9 
9 
9 
9 
4 
ad. $ 
8 
11 
3 
ad. $ 
1 
28 
1 
1 
1 
1 
Died in process of second molt. 
