DIAMOND-BACK TERRAPIN ULTURE 
59 
Table 22. — Rate of growth of the brood of 1910 
When measured 
Winter fed 
Hibernating 
Number 
Smallest 
Largest 
Females 
125 mm. 
or more 
in length 
Average 
length 
Number 
Smallest 
Largest 
Females 
125 mm. 
or more 
in length 
Average 
length 
Mm. 
Mm. 
Mm. 
Mm. 
Mm. 
Aim. 
October, 1910.. 
171 
25 
31 
i 28. 1 
May 10, 1911 
173 
28 
61 
39.7 
Feb. 9 to Apr. 22, 1912... 
105 
35 
78 
53.4 
104 
29 
49 
38.0 
Sept. 9, 1912 
161 
41 
98 
78. 7 
98 
56. 5 
July 2, 1913 
94 
38 
90 
68. 5 
Sept. 10, 1913 
157 
52 
122 
88.4 
97 
62 
105 
84.4 
Apr. 30, 1914 
153 
52 
124 
99.4 
97 
62 
105 
84.4 
Apr. 12, 1915 
94 
83 
118 
101.8 
Oct. 5, 1915 
143 
83 
154 
71 
122. 1 
95 
89 
137 
19 
117.6 
Aug. 29, 1916: 1 2 
Male 
16 
84 
107 
l Qt 
f 98. 0 
5 
90 
96 
\ 4 , 
/ 93.4 
Female 
127 
100 
154 
1 130. 1 
89 
99 
147 
/ 41 
\ 121.4 
Oct. 3, 1917: 
Male. . 
5 
91 
97 
} 55 
r 94.2 
Female 
78 
101 
152 
l 128.2 
Sept. 13, 1918: 
Male.. 
17 
85 
108 
\ in 
/ 98.8 
5 
91 
97 
/ 94.2 
Female 
129 
117 
165 
/ 111 
\ 140. 3 
89 
112 
156 
l 136. 7 
Sept. 20, 1919: 
Male.. .. 
18 
85 
3 109 
/ 3 97. 7 
5 
92 
97 
f 3 94. 8 
Female 
129 
120 
164 
l 140. 1 
89 
114 
158 
\ 136. 4 
Oct. 21, 1925: 
Male 
11 
88 
112 
f 102. 7 
5 
96 
100 
[ 97.8 
Female 
102 
123 
165 
l 142. 6 
87 
127 
163 
I 87 
\ 140. 4 
1 The average size of newly hatched terrapins, according to more recent measurements, is about 27 millimeters. This difference 
between the early and more recent measurements very probably is the result of the methods used. The recent measurements 
were made with calipers, whereas the early ones were made with an ordinary rule and are therefore less accurate. 
2 Some of the males, but not all, were distinguishable prior to this date. 
3 The apparent slight decrease in size may be due in part to a closer measurement, but it is more probable that the terrapins 
measured in 1918 and 1919, in part, were not the same ones, as all the terrapins in any one pen seldom are found at one time. 
Table 23. — Rate of growth of brood of 1911 1 
When measured 
Winter fed 
Hibernating 
Number 
Smallest 
Largest 
Females 
125 mm. 
or more 
in length 
Average 
length 
Number 
Smallest 
Largest 
Females 
125 mm. 
or more 
in length 
Average 
length 
Aim. 
Aim. 
Aim. 
Aim. 
Mm. 
Aim. 
Sept. 10, 1911 
100 
25 
30 
2 28.1 
100 
25 
30 
2 28. 1 
Apr. 23, 1912 
98 
25 
38 
30.9 
98 
24 
31 
27.9 
Se'pt. 9, 1912 
95 
29 
68 
47.0 
89 
30 
59 
43. 1 
May 21, 1913.. 
86 
41 
79 
58.8 
86 
31 
63 
46.8 
Sept. 12, 1913 
83 
47 
102 
79. 1 
84 
42 
88 
64.6 
Apr. 29,' 1914 
82 
49 
105 
79.5 
81 
51 
89 
71.8 
Mar. 23, 1915- 
78 
65 
120 
97.7 
77 
64 
110 
90.5 
Oct. 5, 1915 
81 
96 
145 
33 
115.0 
78 
83 
131 
5 
105.8 
Sept. — , 1916... 
82 
94 
155 
49 
129. 8 
78 
85 
141 
19 
112.4 
Sept. 26, 1919 
82 
110 
162 
82 
141.2 
78 
107 
159 
70 
135.7 
Oct. 16, 1923 
74 
116 
162 
38 
140.7 
Oct. 29, 1925— 
78 
120 
165 
107 
144.6 
72 
110 
164 
35 
143.6 
Oct. 21, 1927 
72 
129 
164 
35 
145.6 
1 The two lots of the 1911 brood contain no males. 
2 The average size of newly hatched terrapins, as shown, is about 28.1 millimeters (1J4 inches). 
