APPARENTLY CORRELATED TO THE CONDITIONS OP LIFE. 
327 
Table VI.—Ramleli Fresh-water Lake No. 2. 
(a.) Shells Varying in Length heiiveen 21 mm. and 17 min. 
Measurements of shells in millimetres. 
Average breadth of shells having the .same length. 
Ratio of length to 
breadth. 
Length. 
Breadth. 
Length. 
Average 
breadth. 
Number of 
shells. 
21 
15, 14, 13-5 
21 
14-1 
3 
1:0-67 
20 
14, 13(»), 12-5 
20 
13-1 
5 
'Go 
19-5 
13(2) 
19-5 
13 
2 
-66 
19 
13-5, 130, 12-5(3), 12(2) 
19 
12-7 
10 
-66 
18 
13(3), 12-5, 12, 11-5(3) 
18 
12-3 
7 
-68 
17-5 
12(2) 
17-5 
12 
2 
-68 
17 
11-5 
17 
11-5 
1 
-67 
Average ratio of length to breadth in 30 shells varying in length between 21 mui. and 17 mm. 
is 1: 0‘665. 
(Jj.) Shells Varying in Length hetiveen 29 mm. and 16'5 mm. 
Measurements of shells in millimetres. 
Average breadth of .shells having 
the same length. 
Ratio of length to 
breadth. 
j Length. 
Breadth. 
Length. 
Average 
breadth. 
Number of 
shells. 
! 
29 
17 
29 
17 
1 
1 : 0-58 
28 
19, 18 
28 
18-5 
2 
-66 
27-5 
18-5, 18(2), 17 
27-5 
17-7 
4 
*64 
26 
19, 18-5, 17, 16-5 
26 
17-7 
4 
-68 
25 
17-5, 16 
25 
16-7 
2 
•67 
24 
17(2), 16-5^ 15-5^ 15 
24 
16-2 
5 
-67 
23-5 
15-5 
23-5 
15-5 
1 
-65 
23 
15, 14 
23 
14-5 
2 
-63 
22 
15-5 
22 
15-5 
1 
-70 
21-5 
15, 14 
21-5 
14-5 
2 
•67 
20-5 
13 
20-5 
13 
1 
•65 
20 
14, 12 
20 
13 
2 
•63 
19-5 
13 
19-5 
13 
1 
•66 
19 
12 
19 
12 
1 
•62 
16-5 
11-5 
16-5 
11-5 
1 
•69 
Average ratio of length to breadth in 30 shells varying in length between 29 mm. and 16'5 mm. 
is 1: 0-657. 
