PLANKTON OF THE GULF OF MAINE 
337 
The bathymetric range of T. catharina in the gulf is considerable. We have 
taken it on the surface at four stations in August, two in March, and three in April . 79 
In connection with the relationship of Tomopteris to temperature, discussed below* 
it is interesting that the surface captures in summer have all been in the northeast 
part of the gulf — that is, on German Bank, near Lurcher Shoal, and off the eastern 
coast of Maine— whereas the localities where we have taken it on the surface in early 
spring include Massachusetts Bay and the general neighborhood of the Isles of 
Shoals in the western side as well as German Bank in the eastern. 
At the other extreme T. catharina certainly occurs as deep as 180 meters (closing- 
net haul at station 20079, March 22, 1920), and probably down to 200 meters, if 
not still deeper, though the majority of captures have been in open -net hauls from 
40 to 150 meters depth. When the actual depths of the individual hauls yielding 
Tomopteris are classified by months, its bathymetric distribution appears decidedly 
uniform from season to season, as illustrated by the following partial list of the cap- 
tures for midsummer as compared with early spring: 
Partial list of the captures of Tomopteris for midsummer, as compared with early spring 
MIDSUMMER 
Station 
Date 
Depth in 
meters 
Station 
Date 
Depth in 
meters 
10011 
July 17,1912 
July 24,1912 
Aug. 14.1912 
Aug. 16,1912 
July 8,1913 
do 
110-0 
40-0 
(') 
(>) 
55-0 
73-0 
146-0 
37-0 
36-0 
146-0 
36-0 
165-0 
10103 
Aug. 14,1913 
July 19,1914 
... do . 
55-0 
70-0 
100-0 
240-0 
(’) 
50-0 
0) 
50-0 
175-0 
120-0 
150-0 
10014 
10213 
10030. 
10214 
10032. 
10225.. 
July 23,1914 
do ._ 
10057 
10245 . 
10058 
10240 
Aug. 12,1914 
do 
10088 
Aug. 9, 1913 
Aug. 11,1913 
Aug. 12,1913 
Aug. 13,1913 
do.. 
10247 
10091 
10248 
Aug. 13,1914 
10095 
10249 
10097 
10250... 
Aug. 14, 1914 
Aug. 23,1914 
10099 
10255 
10100 
. _do 
EARLY SPRING 
20050 
Mar. 1, 1920 
Mar. 2,1920 
75-0 
20086 
Mar. 23, 1920 
150-0 
20052 
100-0 
20087 
Mar. 24, 1920 
200-0 
20055 
Mar. 3,1920 
3 180-140 
20092 
Apr. 9, 1920 
.. .do .. 
(’) 
20056 
75-0 
20093 
(') 
35-0 
20057 
Mar. 4,1920 
...do .. 
75-0 
20096.... 
Apr. 10, 1920 
Apr. 11,1920 
do... _ 
20059 
60-0 
20097 
80-0 
20060 
do 
0) 
30-0 
20098 .. 
90-0 
20062. 
Mar. 5, 1920 
Mar. 13,1920 
Mar. 22, 1920 
do. . 
20100 . 
Apr. 12,1920 
Apr. 16,1920 
Apr. 17,1920 
. .do .. 
100-0 
20072 
75-0 
20107 _ 
140-0 
20079 
3 180-0 
20113 
130-0 
20080 
40-0 
20111 
110-0 
20081 
Mar. 23, 1920 
__do 
140-0 
20115 
Apr. 18,1920 
__do _. 
200-0 
20084 
30-0 
20116 
100-0 
20085 
do 
60-0 
20119 
Apr. 20,1920 
0) 
’Surface net. ’Closing net. 
Although T. catharina has not yet been detected in the bottom water of the deep- 
est trough of the gulf, it is to be expected there, for off Ireland it occurs indifferently 
from the surface down to more than 1,000 meters depth (Southern, 1911). Our sur- 
face catches, like Huntsman’s (1921, p. 87) were with one exception between 6 p. m. 
7( The surface records are as follows: Stations 10030 and 10032, Aug. 14 and 16, 1912; stations 10245 and 10247, Aug. 12 and 13, 
1914; stations 20060 and 20085, Mar. 4 and 23, 1920; stations 20092, P0093, and 20119, Apr. 9 and 20, 1920. 
