326 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
13 
though certainly not neritic, is not oceanic in the true sense, because 
most of its records are from the neighborhood of land, not from the 
high seas, in marked contrast to A. okent. 
QUANTITATIVE HAULS IN THE GULF OF MAINE. 
Quantitative hauls were made at fourteen of the Gulf of Maine 
stations; and they are directly comparable with one another because 
the interval of time between the first and last haul was so short (six 
days) that they can be considered as practically simultaneous. The 
volumes of plankton under each square meter of sea area, calculated 
from them were :— 
ec. in a column ec. in a column 
1 sq. meter in cross 1 sq. meter in cross 
Station section Station section 
10087 180 10099 30 
10089 80 10100 220 
10090 120 10101 100 
10092 160 10102 4 90 
10095 60 10103 70 
10096 120 10104 90 
10098 70 10105 55 
These volumes are not the absolute amounts actually present, 
because they take no account of the coefficient of filtration of the nets. 
This, however, would be the same for all the hauls, and with the com- 
paratively coarse silk of which they were composed would be small. 
It is obvious that the volumes do not give a direct measure of the 
density of the plankton, because the length of the column of water 
through which the net fished varied from 20 to 120 fathoms, according 
to the depth of water at the various stations. The volume of plankton 
per cubic meter of water (coefficient of filtration neglected) was as 
follows :— | 
/ 
Station ec. per. cu. m. Station éc. per cu. m. 
10087 1.4 10099 . 8 
10089 44 10100 1.3 
10090 Sh 10101 1.4 
10092 | i ; 10102 | 
10095 Li 10103 9 
10096 113 10104 6 
10098 1.3 10105 5 
