304 University of California Publications in Zoology |Vou.9 
The frequency, total number of animals and highest average 
per hour reach the minimum in Section A, that is, during day- 
light. It should be noted that the plurimum, according to these 
hauls, is at a depth of from 100 to 160 fathoms. 
Section D is next to section A in all respects, and the depth 
at which the plurimum is located is within the same limits as 
for daylight hours. 
Section B, including hauls made between 6 and 10 p.m., 
shows a marked rise in frequency with a greatly increased aver- 
age for the whole time as well as a much greater plurimum. 
The plurimum was found between 7 and 12 fathoms. 
The maximum in all respects is reached between 10 p.m. 
and 2 a.m. (section C), with the plurimum at 10 fathoms. 
While it may be argued that the number of hauls is so small 
as to render it inadvisable to draw conelusions from the hori- 
zontal closing nets, the evidence for diurnal movements is so 
marked in tables 28 and 29 that one can hardly doubt that they 
actually take place. It is noticeable that the main results set 
forth in tables 28 and 29 check closely with those in tables 
26 and 27 for the surface collections. 
The results of hauling with the vertical closing nets are 
given in table 30, which follows. 
TABLE 30 
Distribution of Metridia as shown by the vertical closing nets 
Day Night 
6-12 a.m., 4-6 p.m. 2-6 a.m., 6-8 p.m. (below 50 f.) 
Depth in No. of hauls No. of animals No. of hauls No. of animals 
fathoms Total Suecess. Total Per fath. Freq. Total Success. Total Per fath. Freq. 
y, B Cc D F G H I J 
ile 5-0 15 1 2 0.4 7 14 1 2 0.2 7 
2. 10-5 15 0 0 0.0 0 14 1 4 0.8 7 
3. 15-10 15 0 0 0.0 0 15 3 22 4.4 25 
4. 20-15 15 0 0 0.0 0 15 4 50 10.0 27 
5. 25-20 15 0 0 0.0 0 14 5 81 16.2 36 
6. 30-25 17 0 0 0.0 0 14 6 134 26.8 43 
7. 40-30 14 0 0 0.0 0 14 6 110 11.0 43 
8. 50-40 16 2 2 2.0 12 15 7 LOTS Oe 47 
9. 75-50 iyi 6 485 19.4 35 16 11 175 7.0 69 
10. 100-75 6 2 201 8.0 33 By 1 1036 41.1 33 
11. 150-100 6 4 251 5.0 66 4 3 500 10.0 75 
12. 200-150, 6 6 1467 29.3 100 3 2 34 On 66 
13. 250-200 6 6 828 16.5 100 1 0 0 0.0 0 
14. 300-250 4 3 489 9.8 75 1 0 0 0.0 0 
