SEA-FISHERIES LABORATORY. DEL 
As the coarse and the fine nets as a rule catch very 
different assemblages of organisms, we consider that by 
adding the records of the two hauls together we get the 
best possible idea of the plankton obtainable in a traverse 
of the surface of the bay. We then take the numbers 
nets together 
33 
obtained by adding “‘ coarse’ and “‘ fine 
as being what may be considered a standard haul 
comparable with a 15 minutes’ haul of the two similar 
surface nets from the yacht in the sea outside. In 
January there were seven hauls of the coarse net, 
ranging from 1°0 to 3°0 c.c. in quantity of catch, and 
seven hauls of the fine net, ranging from 0°9 to 2°1 c.c., 
and if each pair of hauls taken on the one occasion be 
treated as one, the range for the month is 2°0 to 5'1 c.c., 
and the average double catch is 3°08 c.c. 
In the following table the numbers of the Diatoms 
and other leading groups of organisms have been treated 
in a similar manner to that described above for the 
volume of the catches :— 
TaBLE I, Monthly Averages for Horizontal Surface Nets, in Bay. 




Double Average 
1910. hauls. catch Diatoms. Dinoflag- Copepoda Copepoda Copepoda 
c. +f. In ¢.c. ellates. adult. Juv. nauplii. 
BOUSTY s.0 ce. T 3:08 19,994 953 5,679 497 2,014 
ebruary 9 2-17 43,871 1,214 1,770 199 L777 
PEO coe enet ess 8 Dot 381,662 1,419 858 337 5,919 
BEOEL -... 000542 10 63°35 =: 11,505,577 8,913 7,371 5,105 15,630 
EY os cresees 8 61-18 5,870,037 15,375 7,912 2,656 18,437 
MLO ce coca es ii 36-11 9,812,612 59,121 33,634 5,718 21,526 
MMRLY, cc dense 9 22-98 2,181,002 69,722 51,234 5,662 24,227 
mgust ...... !) 11-66 850 11,467 34,394 2,258 32,360 
September 9 15-58 676,823 19,027 42,170 2,638 36,378 
Dctober ...... 9 13-1 553,601 5,122 30,371 3,849 19,689 
ovember ... 8 4-96 100,262 730 8,590 776 2,929 
December ... 9 5:74 48,391 2,205 6,352 497 1,689 

We have now to add the additional information as 
to the plankton of the bay water obtained from the series 
of vertical hauls. The catches in this case are naturally 
