724 
BULLETIN OF THE BUREAU OF FISHERIES 
Figure 9.— Carves of annual growth in length, showing seasons of growth and rest of yellow sand shell at Mississippi 
River, Fairport, Iowa; White River, Newport, Ark.; and Rio Grande [Valley near Mercedes, Tex. Increase in 
size; that is, growth values are actual; resting periods estimated on basis of geographic location and length of cold 
season as shown by Weather Bureau 
Table 5. — Increase in length per month of growth for each year of yellow sand shell, Lampsilis anodon- 
toides (Lea) 
[Growing periods estimated] 
Year 
Mississippi River, Iowa 
White River, Ark. 
Rio Grande Valley, Tex. 
Length of 
growing 
season 
Male 
Female 
Length of 
growing 
season 
Male 
Female 
Length of 
growing 
season 
Male 
Female 
Glochidial year 1 _ 
I , 
II 
III 
IV 
V 
VI... - 
VII 
Months 
2 
3 
5 
5 
5 
5 
5 
5 
5 
Cm. 
0. 01 
.53 
.79 
.54 
.27 
. 16 
. 18 
.12 
Cm. 
0. 01 
.52 
.72 
.66 
.30 
.17 
.13 
.08 
.08 
Months 
2 
5 
7 
7 
7 
7 
7 
7 
7 
Cm. 
0.01 
.58 
.56 
.32 
. 19 
.18 
.09 
.01 
. 16 
Cm. 
0. 01 
.67 
.51 
.31 
. 19 
.08 
.06 
Months 
2 
7 a 
9 
9 
9 
9 
9 
Cm. 
0. 01 
.61 
.38 
.23 
. 12 
.09 
. 14 
Cm. 
0. 01 
.64 
.39 
.21 
.21 
.10 
.07 
VIII 
i 
1 See Merrick, 1930. 
