200 PROF. W. A. HERDMAN ON THE DISTRIBUTION 
the laboratory at the Diological Station, the stomach-contents of a number of 
these herrings, I found in every case that the stomach contained a mass of 
red material which was obviously, under the microscope, the broken-down 
remains of Copepoda. A few Crab zoea were recognisable, but the bulk of 
the material consisted undoubtedly of the Copepoda. Mr. Scott examined 
5 c.c. of the stomach-contents for me, and found that it contained 975 easily 
recognisable specimens of Temora. A photograph (fig. 21), which Mr. Scott 
Fra. 21.— Temora remains from the stomachs of the Herring. 
From a photo-micrograph by A. Scott. 
has made from one of the microscopic preparations, shows appendages that 
undoubtedly belong to this Copepod, while here and there in the stomachs 
complete specimens of Temora are to be seen. It is not possible to doubt 
that during these weeks, at the height of the summer herring fishery in the 
Irish Sea, the fish were feeding mainly upon this species of Copepod. 
We recorded a similar occurrence off the Lancashire coast a few years ago, 
when in July 1913, at the time of an abundant mackerel fishery off Walney 
Island, the stomachs of some of the fish were found to be full either of Temora 
alone or of Temora mixed with Jsias and a few other Copepoda (see fig. 19, 
p. 198). A few herrings from the Port Erin fishery of July 1916 were 
found by Mr. Scott to be feeding mainly on Calanus. 
CONCLUDING REMARKS. 
Many food-fishes are known to feed upon Copepod plankton during at 
least some portion of their life. The Loch -Fyne herrings are frequently 
at the time of a fishery found to have their stomachs filled with HKucheta or 
Calanus. Mackerel, in the English Channel and to the S. W. of Ireland and 
elsewhere, have been recorded as feeding on Calanus. It has been shown in 
this paper that in Hebridean Seas the mackerel and in the Irish Sea herrings, 
