370 
BULLETIN OP THE BUREAU OP FISHERIES 
by the early spring of 1920, which corroborates Alexander Agassiz’s suggestion that 
Pleurobrachia abandons the surface in the cold season. 
Catches of Pleurobrachia in 1920 1 
Off Seguin Island ; 
20058 
Mar. 4 
/Surface 
None. 
\30-0 meters „ 
Many. 
None. 
Off Cape Elizabeth 
20059 
do _ 
/Surface _ 
160-0- 
Few. 
Near Isles of Shoals 
20060 
do 
/Surface 
None. 
190-0 
Few. 
Off Boston Harbor 
20062 
Mar. 5 
/Surface 
Many. 
Do. 
\30-0 
Browns Bank... 
20072 
Mar. 13 
/Surface 
None. 
\75-0._ 
Many. 
None. 
Off Shelburne, Nova Scotia 
20073 
Mar. 17 
/Surface 
\70-0__ 
35. 
Do 
20074 
Mar. 19 
/Surface 
None. 
1125-0. 
Few. 
Do... 
20075 
do 
/Surface 
None. 
\80-0 
Swarm (2 liters) 
None. 
Off Machias, Me 
20080 
Mar. 22 
/Surface 
\40-0._ 
Many (1 liter) . 
None. 
Off Petit Manan 
20081 
Mar. 23 
/Surface 
\ 140-0 
Occasional. 
Off Yarmouth, Nova Scotia 
20083 
...do 
/Surface 
Do. 
\30-0_ 
Many (1 liter) 
Few. 
Off Seal Island, Nova Scotia 
20084 
do 
/Surface 
130-0. 
Many. 
100+ . 
Do 
German Bank 
20085 
...do 
/Surface 
\60-0__ 
East side of basin 
20086 
do 
/Surface 
None. 
\ 150-0 
Few. 
Off northern Cape Cod 
20088 
Mar. 24 
/Surface 
None. 
\75-0_ 
Few. 
Off Cape Ann 
20090 
Apr. 9 
Apr. 10 
None. 
Platts Bank 
20094 
160 (closing net) 
/Surface 
Few. 
None. 
\60-0 
Few. 
Off Cape Elizabeth 
20095 
do 
60-0 
2. 
Off Seguin Island . .. 
20096 
Few. 
\35-0_ 
Do. 
Off Mount Desert 
20099 
Apr. 12 
None. 
\35-0 
Few. 
Off Yarmouth, Nova Scotia 
20102 
Apr. 13 
/Surface 
12. 
\30-0 
Many. 
None. 
German Bank 
20103 
Apr. 15 
\60-0 
Swarm. 
Off Seal Island, Nova Scotia 
20104 
do 
Many. 
Swarm (4 liters) 
Few. 
\25-0 
Browns Bank 
20106 
Apr. 16 
\40-0 
Many. 
Few. 
Off northern Cape Cod 
20117 
Apr. 18 
Apr. 20 
40-0. 
Cape Cod Bay..’ 
20118 
15-0... . ... . 
Swarm (6 liters) . 
None. 
Massachusetts Bay 
20119 
\40-0__ 
Few. 
Off Merrimac River 
20122 
May 8 
\65-0__ 
Few. 
Southwest part of Georges Bank 
20128 
May 17 
do 
Many. 
None. 
Continental edge 
20129 
/Surface 
\50-0._ 
Many. 
1 For records ol Pleurobrachia from 1912 to 1916 see Bigelow, 1914, p. 126; 1914a, p. 403; 1915, pp. 318and 320; 1917, pp. 303 and 
304; 1922, p. 158. In the winter of 1920-21 it was taken at stations 10488, 10491, 10492, 10497, and 10501. 
In most cases surface hauls alone would not have revealed the existence of the 
local swarms of Pleurobrachia at these stations, but occasionally they are evenly 
distributed downward through the upper 30 meters or so of water in the cold season, 
just as they often are in summer. On the other hand, this ctenophore seldom or 
never sinks into the deepest strata of the gulf, a statement justified by its absence 
over the basins as well as by the fact that most of our records and all the richest 
catches have been from hauls no deeper than 30 to 50 meters. 
Since Pleurobrachia is present in the Gulf of Maine throughout the year, it 
necessarily experiences a wide range of temperature and salinity there. On the one 
