Horizontal Distribution — Swarms. 
369 
catches were scattered from 15,000 to 50,000. While there is 
considerable variety in these catches, yet, when the length of 
time and the number of observations are considered, the extent 
of variation lends no support to the theory of occurrence in 
swarms. 
Table XXV. — Diaptomus and Daphnia .— December, 1894—April, 1895. 
Expressed in thousands per sq. meter . 
Diapto¬ 
mus. 
Daphnia. 
Diapto¬ 
mus. 
Daphnia. 
19 
103 
February 15. 
17 
51 
13 
144 
32 
42 
28 
154 
February 19. 
38 
76 
27 
93 
41 
109 
24 
100 
35 
83 
22 
116 
29 
86 
18 
78 
February 23. 
36 
54 
25 
91 
43 
60 
December 7.. 
26 
138 
48 
66 
17 
118 
March 6.... 
24 
30 
December 19. 
17 
57 
29 
41 
23 
41 
March 7. 
31 
48 
J anuary1 . 
13 
45 
32 
69 
17 
52 
51 
45 
25 
55 
March 9. 
36 
56 
January 2 . 
12 
48 
27 
26 
22 
65 
March 12. 
28 
28 
22 
41 
45 
63 
January 6 .......... 
15 
36 
56 
60 
8 
39 
27 
39 
11 
36 
March 16. 
34 
83 
January 9. 
29 
54 
45 
102 
16 
57 
33 
86 
20 
60 
71 
103 
January 16. 
16 
53 
AT a rr’.h 18 .. 
32 
69 
13 
61 
34 
72 
23 
53 
March 23. 
33 
39 
February 14. 
23 
43 j 
27 
40 
The foregoing table shows the numbers of Diaptomus and 
Daphnia hyalina during the winter of 1894-5. Similar results 
24 
