326 
MR. W. BATESON ON SOME VARIATIONS OF CARBIUM EDULE 
Table IV.—Shells from the Bottom of Jaman Klich. 
Measurements of shells In millimetres. 
: Average breadth of shells having the same length. 
Eatio of length to 
breadth. 
Length. 
Breadth. 
I.ength. 
Average 
breaoth. 
Number of 
shells. 
24 
17, 16-5 
24 
16-7 
2 
1 : 0-69 
23 
17, 16 
23 
16-5 
2 
-71 
22 
16(3) 
22 
16 
3 
•72 
21-5 
15-5 
21-5 
15-5 
1 
•72 
21 
15(2) 
21 
15 
2 
•71 
20-5 
15 
20-6 
15 
1 
•73 
20 
14(2) 
20 
14 
2 
•70 
19 
14-5, 14(2), L3-5(2) 
19 
13-9 
5 
•73 
18-5 
14(i), 13 
18-5 
13-8 
5 
•75 
18 
13-5, 13 
18 
13-2 
2 
•73 
17-5 
14, 13 
17-5 
13-5 
2 
•77 
17 
13, 12 
! 17 
12-5 
2 
•73 
16 
11 5 
16 
i 
11-5 
1 
•71 
Average ratio of lengfcli to breadth in SO .shells varying in length between 24 mm. and 16 mm. 
is 1 : 0-726. 
Table V. — Shells from the Shore of Mareotis. 
Shells Varying in Length between 27 mm. and 20 mm,. 
Mea.surements of shells in millimetres. 
Average breadth of shells having 
the same length. 
Eatio of length to 
breadth. 
Length. 
Breadth. 
Length. 
Average 
breadth. 
Number of 
shells. 
27 
19, 18 j 
27 
18-5 
2 
1 : 0-68 
26 
18 1 
26 
18 
1 
•69 
25 
18(2), 17 . 5 ^ 17^ 10 ( 2 ) 
25 
17 
6 
•68 
24-5 
17 
24-5 
17 
1 
•69 
24 
16-5 
24 
16-5 
1 
•68 
23 
16(2), 150 
23 
15-5 
6 
•67 
22-5 
16 ( 2 ), 1 . 5-5 
22-5 
15-8 
3 
•70 
22 
15-5, 15 
22 
15-2 
2 
•69 
21-5 
15 
21-5 
15 
1 
•67 
21 
15, 14(1) 
21 
14-2 
5 
•70 
20 
14(2) 
20 
14 
2 
Average ratio of length to breadth in 30 shells varying in length between 27 mm. and 20 mm. 
is 1: 0-680. 
