SEA-FISHERIES LABORATORY. 101 
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 Isias and a few other Copepoda. A few 
herrings from the Port Erin fishery of July, 1916 were found 
by Mr. Scott to be feeding mainly on Calanus.” * 
Amongst note-worthy large catches of the other more 
important Copepoda, we find :— 
Pseudocalanus elongatus—34,800 on March 28th and 22,200 
on September 6th. 
Oithona sumilis—60,100 on July 15th ; 53,600 on August 5th ; 
88,800 on August 8th and 51,410 on December 21st. 
_ Paracalanus parvus—71,300 on September 6th. 
Acartia’ clausi—62,200 on September 6th; 37,600 on 
August 5th and 39,000 on August 22nd. 
In December there was a decided invasion of our district 
by the minute northern and deep-water Copepod Microcalanus 
pusillus, the distribution of which was discussed in one of 
our former Reports. 
Turnmg now to other less important groups of the 
plankton, we find that Ozkoplewra was, as usual, present 
throughout the year, and was especially abundant in June 
and August. The greatest number recorded for one haul was 
26,000 on June 6th. In August the cast-off “ houses,” or 
cuticular investments, were so prevalent in the plankton of 
Port Erin as to clog the nets and increase greatly the difficulty 
of picking out and counting the other organisms. 
In regard to the various larval forms :—Kchinoderm 
* Herdman, Spolia Runiana III, Journ. Linn. Soc. Bot., XLIV, p. 199 (1918). 
