ANNUAL GROWTH OF FRESH-WATER MUSSELS 731 
Table 10. — Median length in relation to age of the Lake Pepin mucket, Lampsilis siliquoidea pepin- 
ensis, Baker 
MALE 
Ring No. 
Number of 
specimens 
Length 
Number of 
specimens 
Length 
I 
200 
Centimeters 
1.98 d- 0.048 
100 
Centimeters 
2.25 d- 0.0548 
II 
200 
3.95 dr 
.050 
100 
3.88 dr 
.0609 
HI _ _ 
200 
5.57 dr 
.054 
100 
5.11 dr 
.0527 
IV.. 
200 
6.77 dr 
.052 
100 
6.17 dr 
.0581 
V 
196 
7.65 ± 
.054 
100 
7.09 ± 
.0489 
VI 
185 
8.31 ± 
.053 
97 
7.69 ± 
.0500 
VII 
132 
8.70 ± 
.057 
85 
8.21 ± 
.0525 
VIII 
85 
9.05 ± 
.071 
60 
8.72 ± 
.1221 
IX 
46 
9.32 ± 
.091 
33 
9.01 dr 
.0742 
X 
25 
9.43 dr 
. 130 
10 
9.32 dr 
.1180 
XI 
8 
9.33 ± 
. 191 
4 
9. 70 dr 
.1686 
XII 
3 
9.70 dr 
.292 
1 
9.81 ± 
XIII 
1 
10.60 
Lake Pepin 
Cross Lake 
FEMALE 
I 
200 
1.96 dr 
0. 049 
100 
1.98 dr 
0. 0511 
II 
200 
4.27 dr 
.042 
100 
3.42 dr 
.0535 
III 
200 
5.66 dr 
.037 
100 
4.93 dr 
.0535 
IV 
200 
6.59 dr 
.040 
100 
5.96 dr 
.0486 
V 
192 
7.15 ± 
.034 
100 
6.67 dr 
.0456 
VI 
139 
7.59 dr 
.042 
100 
7. 24 ± 
.0475 
VII 
86 
7.86 dr 
.050 
73 
7.56 dr 
.0564 
VIII 
30 
7.97 dr 
.092 
32 
7.87 dr 
.0723 
IX 
17 
8. 10 dr 
. 116 
12 
8.40 dr 
.1938 
X 
7 
8.50 dr 
.228 
2 
8.55 ± 
XI 
i 
8. 60 
CMS. 
Figure 16. — Median curve, together with first and ninth decil curves, of growth in length for both sexes of the Lake 
Pepin mucket. Maximum and minimum cases for the various year classes are represented by the locality symbol 
transfixed by a horizontal line. 
