292 A. FRANKLIN SHULL 
TABLE 2 
Showing the number of male- and female-producers in two lines of Hydatina senta, 
one line being the result of inbreeding in the other line, that is, being derived from 
the offspring of a male and female both from the other line. Male-producers are 
designated 7 9@, female-producers 9 @. 
| 
ORIGINAL LINE 1 INBRED LINE 
DISS | Number of 9| Number of 2 Pa EENGO! Eos | Number of o&' 9} Number of 9 2 
young | | young 
October October | 
24 1 8 24 | 0 28 
26 4 30 25 10 36 
28 0 28 | Pil 2 Zit 
29 0 48 | 29 2 17 
* Sil 5 40 | 30 2 43 
November | | | November 
2 | 0 193) 1 3 44 
4 1 15 3 a 38 
6 | 7 33 5 2 45 
8 8 38 6 2; 44 
10 9 | 36 8 | 0 26 
12 0 | 22 10 | 14 36 
14 1 38 12 | 13 9 
16 2 | 46 | 14 | 6 37 
18 5 27 | 16 3 30 
20 8 18 \ 18 10 9 
22 2 3, val 20 0 23 
25 6 39 | 22 1 11 
26 2 28 24 4 10 
28 iR 2B 26 1 7 
30 4 | 4 28 9 25 
December | 30 0 41 
By 0 27 _ December 
4 3 40 2 2 33 
7 3 23 | 4 | 1 43 
9 | 11 4 \ 6 20 20 
12 1 | 22 9 | it 10 
13 0 5 i 2, 
0 29* 11 2 13 
1{:55 0 15e 13 0 17 
15 3 14* 
Rotalersm: 88 736 le 7 732 
Per cent of 
CoG Bootes 10.6 16.7 
| 
* Remainder of family not recorded. 
