718 
BULLETIN OF THE BUREAU OF FISHERIES 
Figure 5. — Median curves of growth in length for both sexes of yellow sand shell, Lampsilis anodontoides 
(Lea) from the Mississippi River, Fairport, Iowa; the White River, Newport, Ark.; and the Rio 
Grande Valley near Mercedes, Tex. Curves obtained by plotting median values for annual length 
against age; that is, first year’s growth precedes formation of Ring 1 
Table 1 . — Median values of length in relation to age of the yellow sand shell , Lampsilis anodontoides 
(. Lea ) 
MALES 
Ring No. 
Mississippi River, Iowa 
White River, Ark. 
Rio Grande Valley, Tex. 
Number 
of speci- 
mens 
Length 
N umber 
of speci- 
mens 
Length 
Number 
of speci- 
mens 
Length 
Centimeters 
Centimeters 
Centimeters 
1 
100 
1. 61±0. 055 
50 
2. 80±0. 2012 
56 
4. 61±0. 1079 
II 
100 
5.54± .067 
50 
6. 69± . 1255 
56 
8. 02± . 1052 
III 
100 
8.22± .089 
40 
8.93± .0767 
49 
10.11± .1072 
IV 
97 
9. 57± . 085 
24 
10.26± .0970 
35 
11. 21± .0832 
V 
57 
10. 38± .091 
7 
11. 50± .1489 
6 
12. 0Q± .3932 
VI 
20 
U.30± .101 
4 
12. 10=b . 1686 
2 
13. 26 
VII 
9 
11. 90rb .145 
4 
12.2 -- .4497 
VIII.. _ 
2 
13.3 
FEMALE 
I 
100 
1. 58±0. 059 
50 
3. 35±0. 1703 
26 
4. 80±0. 1428 
II 
100 
5.17± .094 
50 
6. 93± .1135 
26 
8. 33± . 1320 
III 
100 
8.47± .073 
49 
9. 13± . 1389 
18 
10. 20± . 1832 
IV 
100 
9. 96± .055 
33 
10.43± .0878 
5 
12. 10± . 1130 
V 
92 
10. 83 zb .054 
29 
10. 97± . 1067 
1 
13.00 
VI 
33 
11.50± . 108 
4 
11.40± .3373 
1 
13. 63 
VII 
10 
11. 90± . 178 
VIII 
3 
12. 30± .117 
