1903. | PLANKTON OF THE FAEROE CHANNEL, 123 
containing several undoubtedly epiplanktonic species (e. g. Arach- 
nactis albida), and has been relegated to the “ doubtful” category, 
closure of the net not having taken place at the proper time ; 
12 was known to be epiplanktonic, although there was some 
doubt as to the exact depth at which it had been towed. I have 
therefore reprinted in the table (pp. 118, 119) the captures of the 
seven forms which were taken at least six times, sufficiently often 
to give approximate data for an estimate of their vertical distri- 
bution. In discussing this question, I gave a short table on 
p. 546 showing the occurrences of these seven species expressed 
in percentages of those Epiplankton and Mesoplankton hauls 
which contained Copepoda; this can now be amended as follows, 
omitting the four doubtful hauls from the calculation :— 
Total hauls containing Copepoda. 
ER CRETE 
SS Ta ae 
Epiplankton. Mesoplankton. 
Calanus finmarchicus occurred in 83 9/5 and in 91 /p 
1 Bucalanus attenuatus ry) 22 4; 5 41 ,, 
Bucheta norvegica _ iit. = Us op 
Metridia longa 3 22 ,, & 1555 
1Pleuromma abdominale ,, bys 55 58 ,, 
Acartia clausii ie 33, z 25 4, 
Temora longicornis 5 33 4, 25 OF 
The amended table is in harmony with the conclusions drawn 
from the former, as to the vertical distribution of these forms, 
except in the case of Acartia clausii, the question of which was 
expressly reserved (op. cit. p. 549). 
Since the publication of Mr. Thompson’s report, I found that 
Dr. R. Norris Wolfenden was making an exhaustive study of the 
fauna of the Faeroe Channel, and naturally placed my collection 
at his disposal. He has been kind enough to furnish the following 
notes on new and other species, with some of which he has 
already dealt briefly elsewhere *?. Exact data of depth &c. were 
not always available, as by the time that Dr. Wolfenden received 
the specimens all the epiplankton hauls of a station had in many 
cases been put together in one bottle, all the mesoplankton hauls 
in another, for economy of space. 
PLEUROMMA ROBUSTUM Dahl, Zool. Anzeig. v. p. 16 (1893). 
“This is the common Plewromma of the Faeroe Channel, and 
was found to be present in considerable numbers in Dr. Fowler's 
collection, Pl. abdominale occurring much more rarely. In these 
northern latitudes it almost entirely replaces the latter species. 
It is readily distinguishable by the horseshoe-shaped mass of red 
pigment which is present in the anterior and inferior portion of 
the head at the hase of the mouth-organs, and in the male by 
1 Dr. Wolfenden points out that as, according to his wide experience, Mucalanus 
attenuatus is nowhere met with in the Faeroe Channel, unless perhaps quite 
exceptionally, these figures probably refer to Hucalanus elongatus. Similarly, for 
the species Pleuromma abdominale should probably be substituted Pl. robustum. 
2 R. N. Woltenden: Journ. Marine Biol. Assoc. (1902), vi. p. 344. 
