60 
BULLETIN OF THE BUREAU OF FISHERIES 
Table 24. — Rate of growth of the brood of 1912 
When measured 
Selects 1 
Runts s 
Number 
Smallest 
Largest 
Females 
125 mm. 
or more 
in length 
Average 
length 
Number 
Smallest 
Largest 
Females 
125 mm. 
or more 
in length 
Average 
length 
Atm. 
Aim. 
Atm. 
Aim. 
Aim. 
Aim. 
Apr. 29, 1914. . 
100 
51 
83 
65.0 
89 
27 
42 
32. 3 
94 
76 
110 
92.0 
82 
30 
82 
53. 2 
Sept. 7, 1910: » 
19 
81 
98 
87.2 
77 
77 
119 
97. 6 
Oct. 11, 1917: 
18 
82 
98 
88.7 
13 
80 
95 
/ 87 2 
72 
82 
130 
98.0 
56 
77 
136 
/ 9 
1 109. 5 
Sept. 30, 1918: 
Male..- 
18 
85 
100 
/ 90.0 
13 
83 
94 
1 17 
/ 88.3 
Female. 
73 
88 
131 
/ 6 
\ 109. 7 
56 
100 
145 
/ 17 
\ 117.0 
Oct. 1, 1919: 
Male 
18 
« 83 
‘ 99 
/ 91.8 
12 
83 
95 
1 34 
/ 89.7 
Female 
75 
* 87 
139 
/ 19 
\ 115. 1 
56 
< 95 
149 
/ 34 
1 123. 0 
Oct. 5, 1920: 
Male 
17 
83 
100 
/ <91.6 
13 
83 
95 
1 nn 
f « 89. 6 
Female..- - 
75 
89 
143 
i 11 
\ 119.0 
55 
108 
151 
1 127. 1 
Dec. 12, 1922: 
Male,.- . 
18 
83 
100 
/ 92.3 
12 
84 
97 
1 48 
/ 91.0 
Female -. 
< 73 
97 
145 
\ 123. 7 
55 
118 
153 
) 48 
\ 134. 0 
Oct. 10, 1923: 
Male.. - -. 
18 
85 
101 
f 93.4 
12 
85 
98 
1 5n 
/ 91.7 
Female 
70 
111 
146 
\ 127. 1 
55 
122 
155 
\ 135. 9 
Oct. 21, 1925: 
Male 
17 
85 
* 100 
f 93.8 
12 
87 
102 
\ 55 
/ 93.9 
Female 
69 
* 100 
148 
I 48 
\ 128. 0 
55 
125 
155 
\ 138. 2 
Oct. 15, 1927: 
Male - 
17 
86 
102 
f 94.0 
11 
90 
< 101 
/ 97.7 
Female 
67 
115 
151 
\ 130. 7 
54 
126 
158 
\ 141. 1 
i “Selects”; 100 best selected from entire brood, Sept. 13, 1913. 
i “Runts”; 100 poorest selected from entire brood, Sept. 13, 1913. 
3 The sexes could not be distinguished definitely prior to this date. 
< The apparent decrease in size may be due to a somewhat closer measurement, or it may be that the same terrapins were not 
measured, for all the terrapins in 1 pen often are not found. 
Table 25. — Rate of growth of the brood of 1913 
When measured 
Number 
Smallest 
Largest 
Females 
125 mm. 
or more 
in length 
Average 
length 
Remarks 
Apr 29, 1914 
686 
Aim. 
22 
Aim. 
32 
Aim. 
27.6 
Hibernated. 
Do 
504 
23 
48 
31. 1 
Fed first winter. 
Do 
100 
34 
48 
37.5 
Selected best from preceding lot; measurements 
based on 100 largest. 
96 
69 
104 
81.1 
Sept 20, 1916 
94 
73 
112 
88. 6 
Oct. 11, 1917: 
4 
77 
95 
} 4 
/ 84.5 
Prior to this date the sexes could not be separated 
definitely. 
90 
76 
125 
l 96.0 
Oct. 1, 1918: 
4 
80 
‘ 89 
\ 3 
f 86.0 
90 
83 
134 
J 3 
\ 103. 7 
Oct. 1, 1919: 
4 
80 
100 
} 10 
/ 88.0 
Female. 
88 
86 
138 
\ 108.3 
Oct. 13, 1920: 
4 
81 
101 
} 11 
/ 89.2 
86 
88 
140 
l 110. 7 
Dec. 12, 1922: 
4 
82 
1 100 
} 29 
f 90.2 
85 
95 
144 
\ 121. 2 
Oct. 10, 1923: 
4 
85 
101 
} 59 
f 92.2 
79 
102 
148 
\ 125. 6 
Oct. 21, 1925: 
4 
85 
103 
J 56 
J 94.0 
75 
105 
150 
\ 128. 1 
i All the terrapins in a pen seldom are found at one time. The decrease in size probably is due to missing one of the smallest 
animals the preceding year. 
