NOTES ON ECTINOSOMA ATLANTICUM. 265 
the size of those described by him. It is a well- 
marked species, and is easily distinguishable from 
any other British Hctinosoma by the comparatively 
elongated joints of the anterior antenne and by the 
long setz of the fifth feet. It has been obtained at 
several places in the open sea to the west and 
south-west of Ireland, and in Kinsale Harbour; 
while Giesbrecht and Mobius have taken it, and also 
Rhincalanus gigas, in the neighbourhood of Kiel. 
There is no previous record of its occurrence on 
the East of Scotland. It was frequent in midwater- 
net material collected eastward of Inchkeith, Firth 
of Forth, but less frequent in the surface -net 
gatherings. _ : 
