312 University of California Publications in Zoology [Vou.9 
and 160 fathoms. Specimens were taken both by day and by 
night between 50 and 75 fathoms, but the abundance and 
frequeney are both greater at night. The table gives, on the 
whole, some evidence of an upward movement at night. 
The vertical distribution of Gaidius as shown by hauls with 
the vertical closing nets appears in table 38 which follows. The 
evidence is similar to that in the preceding table, though much 
clearer as to the upward movement at night. The animals were 
not obtained above 100 fathoms except at night, nor below 200 
fathoms except during the day; this evidently points to a 
movement toward the upper levels during the night. 
TABLE 38 
Distribution of Gaidius pungens as shown by hauls with the vertical 
closing nets, day and night hauls compared 
A B Cc D E 
Total Successful Total Animals per Haul 
Depth hauls hauls animals 100-f. haul frequency 
Day Night Day Night Day Night Day Night Day Night 
15 40-0 106 100 0 4 0 9 0 22 0 4 
2. 100-40 39 489 34 0 2 0 3 0 50 0 6 
os 200-100 12 7 5 55 58 55 58 41 85 
4 250-200 6 1 6 316 632 0 100 0 
5. 300-250 4 1 3 0 345 0 690 0 75 0 
Pleuromamma abdominalis—As may be seen in table 11, 
this species was fairly abundant at the surface, ranking fifth 
in that respect. Two hauls at the surface during the day were 
successful, taking two animals; the discussion of surface distri- 
bution may therefore be limited to night hauls. Table 39 is 
arranged like a number that have preceded, but deals only with 
night hauls that obtained P. abdominalis at the surface. Figure 
6 is derived from the data in table 39. 
