196 
PACIFIC SCIENCE, Vol. XXI, April 1967 
TABLE 3 
Comparison Among the Means: Organic and 
Inorganic Contents of Four Organs of 
P. vigil Throughout the Molt Cycle 
ORGAN AND CONCENTRATION IN DECREASING ORDER 
CARAPACE 
GILL 
MID-GUT 
GLAND 
MUSCLE 
% ORGANIC 
D 3-4 
D3-4 3 * 
D l-2 4 
D l-2 4 
Ci_ 2 
A l-2 3 
D -± 
^3-4 
D 3 -4 4 
^3-4 
Di-2 3 
A^I 
\- 2 2 
Bl-2 
Bi_2 
Cl-2 1 
Bl-2 2 
Ai_2 
Cl-2 
B1-2 1 
Cl-2 
D l-2 
C3-4 
C3-4 
C3-4 
% INORGANIC 
Dl-2 5 
Dl-2 4 
^3-4° 
C3-4 
D 3-4 2 
D3.4 
D l-2 2 
0,-2 
^-3 -4 2 
C3-4 
Ai.2 1 
Cl-2 
C l-2 2 
Cl-2 
Bi-2 1 
D 3-4 
B 1 - 2 X 
Bl-2 
C 3 -4 
B i-2 
A1.2 
Ai-2 
Ci-2 
Ai_2 
* For explanation of superscript numbers see legend for 
Table 2. 
TABLE 4 
STAGE 
Fig. 1. Changes (mean ± S.E.) in the watei 
content of five organs of P. vigil during the molt 
cycle. 
Comparison Among the Means: Calcium and 
Phosphorus Contents of Five Organs 
Throughout the Molt Cycle 
ORGAN AND CONCENTRATION IN 
DECREASING ORDER 
CARAPACE 
GILL 
MID-GUT 
GLAND 
MUSCLE 
BLOOD 
% CALCIUM 
C3-4 2 
c 1 
'-' 3-4 
D 3 - 4 X 
D3-4 1 
D l-2 5 
D 3 - 4 2 
D„ A 
o -4 
Di-2 1 
C3-4 
Bl-2 
Dl-2 1 
Ci-2 1 
C3-4 
D 1 2 
C l-2 
Cl-2 1 
Ai-, 1 
A1-2 
C l-2 
C3-4 
B i-2 
Dl-2 1 
Bi_2 
A i-2 
A1-2 
Ai2 
Bi-2 
Cl-2 
B1-2 
D3.4 
% PHOSPHORUS 
Ai-2 5 
D 3-4 
Bi-2 1 
Di-2 1 
Di-2 4 
B l-2 2 
C3-4 
Ci-2 1 
A1.2 1 
D3.4 1 
Cl-2 1 
Cl-2 
A 1 - 2 1 
C1-2 
Cl-2 
D3-4 
B i-2 
C3-4 1 
B l-2 
Ai-2 
C3-4 
A 1-2 
Di- 2 1 
D3 4 
B i 2 
D i-2 
D 1-2 
D3-4 
C 3-4 
C3-4 
* For explanation of superscript numbers see legend for 
Table 2. 
index. Alterations in one component, e.g., or- 
ganic content, may affect the per cent composi- 
tion of another component, i.e., inorganic con- 
tent. Therefore, losses or gains in one particular 
constituent may only reflect losses or gains in 
another. Alterations in per cent composition 
were chosen because the data appearing in most 
of the literature were expressed in these terms 
and, thus, this index made comparisons more 
accessible. 
More expressive indices would be: mg or 
mEq/mg N, or mg or mEq/gm water. The 
latter ratio is more valid when comparisons 
of equilibria are desired (Robertson, I960). 
Figure 1 illustrates the alterations in water 
content of the carapace, mid-gut gland, muscle, 
gills, and "remainder” during the molt cycle. It 
is clear that the organs become somewhat de- 
hydrated during proecdysis and rapidly rehy- 
drated during ecdysis. 
The organic and inorganic contents of the 
four organs are plotted in Figures 2 and 3, 
respectively. The comparable data for the "re- 
mainder” were not determined because this por- 
