MARINE BIOLOGICAL STATION AT PORT ERIN. 83 
round from January to December, attains to high 
numbers in early spring, and remains fairly abundant into 
late autumn. It reaches close on 7,000 in one haul on 
April Ist, and 19,000 on April 9th; and shows 1,280 and 
1,600 up to the 23rd September. TZemora longicornis 
seems to be equally abundant inside the bay and in the 
open sea, on the surface and in the deeper waters. Some- 
times the large numbers are in the surface nets, and at 
other times in the weighted net from below. This is one 
of the species that congregates 1n swarms, and so is 
occasionally caught in unusually large numbers. Of four 
similar hauls taken across Port Erin Bay on April 13th, 
the first two gave 875 and 620 and the last two 1,550 and 
3,700 specimens of Temora. On the same date three hauls 
(two surface and one deeper) taken outside (Station IIT) 
gave 800, 890 and 900 specimens, which seems to indicate 
an even distribution, but half an hour later a couple of 
miles away the same two surface nets gave 2,400 and 4,750 
specimens; and moreover in this last case nearly all the 
Temora in the 2,400 were young, while in the second net 
the 4,750 were all adults, indicating a segregation of the 
stages 1n swarms. 
A set of hauls were taken at the end of August on 
Station V, inside the Wart Bank. One remarkable 
feature of this occasion was that the Hensen net hauled up 
from 14 fathoms contained 150 specimens of what is 
probably a new species of Leptopsyllus, while the Nansen 
net used at the same time, and at the same depth, on the 
other side of the ship, caught twice as much material but 
not a single specimen of the new Copepod. The surface 
nets are also somewhat divergent in their results, while the 
deeper weighted net has caught a very much larger 
quantity of material, the greater part of which is clearly 
made up of Copepoda both young and old—about ninety- 
five thousand in all. 
