ANNUAL GROWTH OF FRESH-WATER MUSSELS 
719 
CMS. 
Figure 6.— Median curve, together with first and ninth decil curves of growth in length for both sexes of 
yellow sand shell, Lampsilis anodonloides (Lea), Mississippi River, Fairport, Iowa. Maximum and 
minimum cases for the various year classes are represented by the locality symbol, transfixed by a 
horizontal line 
Table 2. — Length in relation to age of yellow sand shell, Lampsilis anodontoides {Lea), Mississippi 
River, Iowa 
[All values in centimeters] 
MALE 
Ring No. 
Minimum 
First decil 
Median 
Ninth decil 
Maximum 
I 
0.4 
0. 88±0. 058 
1. 61±0. 055 
2. 43±0. 092 
3.4 
II 
3.0 
4. 12± .184 
6. 54± .067 
6.50± .081 
7.2 
III 
4.8 
6. 72± .135 
8. 22± .089 
9. 20± . 070 
9.6 
IV 
6.8 
8.32± .090 
9. 57± .085 
10. 36± .055 
11.0 
V 
8.0 
9. 27± .152 
10. 38± .091 
11. 13± .085 
11. 6 
VI 
8.8 
9.40± .452 
11.30± .101 
11.70± .070 
11.8 
VII 
10.6 
10. 78± . 304 
11.90± .145 
12.22± .121 
12.2 
FEMALE 
I 
0.6 
0. 94±0. 052 
1. 58±0. 059 
3. 00±0. 337 
4.6 
II . 
.3 
4. 10± . 107 
5. 17± .094 
6. 70± . 135 
8.0 
Ill 
5.2 
7. 00± .253 
8. 47± . 073 
9. 604= .081 
10.4 
IV 
6.6 
9. 20± . 088 
9. 96± .055 
10.64± .061 
11.2 
V 
8.6 
10. 11± .084 
10.83± .054 
11. 62± . 149 
12.8 
VI 
9.8 
10. 33± . 193 
11.50± .108 
12.27± .097 
12.4 
VII 
10.6 
10.80± .641 
11.90± .178 
12. 80± . 160 
12.8 
VIII 
11.6 
11. 66db . 070 
12. 30± .117 
12.94± .070 
12.8 
29220—31 2 
