388 
PACIFIC SCIENCE, Vol. XXI, July 1967 
TABLE 8 
Day and Night Depth Distributions for 
Streetsia challengeri 
DEPTH IN 
METERS 
TOTAL NO. 
SAMPLES 
NO. 
POSITIVE 
SAMPLES 
PER CENT 
POSITIVE 
Night 
0-50 
4 
2 
50 
50-100 
2 
2 
100 
100-200 
7 
4 
59 
200-300 
4 
2 
50 
300-400 
6 
0 
0 
400-500 
2 
0 
0 
500-600 
7 
0 
0 
600-700 
2 
1 
50 
700-800 
1 
0 
0 
800-900 
1 
1 
100 
900-1100 
3 
0 
0 
Day 
0-50 
2 
0 
0 
50-100 
2 
0 
0 
100-200 
2 
0 
0 
200-300 
4 
3 
75 
300-400 
4 
4 
100 
400-500 
5 
2 
40 
500-600 
5 
2 
40 
600-700 
4 
1 
25 
700-800 
3 
0 
0 
800-900 
4 
2 
50 
900-1100 
8 
3 
37 
Streetsia challengeri Stebbing, 1888:1603- 
1606, pi. 207; Stephensen, 1925:194-199, 
fig. 75; Pirlot, 1929:164-165; Barnard, K. H., 
1930:435; Barnard, K. H., 1932:295; Shoe- 
maker, 1945:255; Fage, 1960:51-63, figs. 36- 
43. 
This species was captured in 31 trawls at 
depths of from 10 to 1100 m. A total of 67 
individuals was sorted from pint aliquots of 
the quantitative samples. 
There is definite evidence of diurnal migra- 
tion toward the surface at night (Table 8). 
Results of sampling with the Foxton device in- 
dicate that the two positive, deep, nighttime 
samples were probably the result of contami- 
nation from shallower depths. 
Family hyperiidae 
Hyperia spinigera Bovallius 
Hyperia spinigera Barnard, K. H., 1932: 
273-274, fig. 160; Thorsteinson, 1941:87-88, 
pi. 8, figs. 79-82; Shoemaker, 1945:238, fig. 
35; Hurley, 1956:15. 
Eight individuals of this species were taken 
in 5 samples at depths of from 300 to 954 m. 
Although only a few specimens were recovered, 
there is some evidence of vertical movement 
upward at night. 
Hyperia bengalensis (Giles) 
Hyperia bengalensis Shoemaker, 1942:49; 
Shoemaker, 1945:238; Hurley, 1956:15-16. 
Some taxonomic confusion accompanies this 
species; Hurley (1956:15-16) gives an ac- 
count of the systematics. The specimens col- 
lected in this present study are very similar to 
that pictured by Stebbing (1888) as H. schizo- 
geneios. 
This species was collected in 13 samples 
ranging in depth from 85 to 975 m. A total 
of 52 individuals was sorted from quantitative 
aliquots. There is definite evidence that Hy- 
peria bengalensis moves toward the surface at 
night. Its daytime depth range was from 288 
to 975 m, while at night it was collected from 
85 to 650 m. 
Hyperia galba (Montague) 
Hyperia galba Sars, 1895:7, pi. 2, fig. 1; 
Caiman, 1898:265; Stephensen, 1924:81, chart 
11; Barnard, K. H., 1932:273. 
Hyperia galba was collected in 31 trawls at 
depths of from 85 to 1100 m, and 78 indi- 
viduals were taken from pint aliquots of quan- 
titative samples. 
The data shown in Table 9 indicate an ob- 
vious migration toward the surface at night, 
concentrating at depths of less than 500 m. 
Family vibiliidae 
Vibilia armata Bovallius 
Vibilia armata Chevreux and Fage, 1925: 
387-388, fig. 391; Pirlot, 1929:100-101; 
Pirlot, 1930:11; Barnard, K. H., 1930:104; 
Barnard, K. H., 1932 :264-265; Hurley, 1956: 
10-11. 
This species was found in 54 samples at 
depths of from 10 to 1100 m. A total of 2,742 
