WAR, BRITISH COPEPODA. 
at any rate in the littoral and laminarian zones, 
occurring usually in considerable numbers, though 
never in the countless swarms of some of the larger 
oceanic species. It is occasionally found amongst 
dredged material, but possibly this may, in some cases 
at least, arise from its being entangled during the 
upward passage of the dredge through the water; in 
the open sea it is often taken by the tow-net. Dr. 
Claus has taken it both in the North Sea and in the 
Mediterranean, M. Boeck on the coast of Norway, and 
Fischer in Madeira (?). With so wide a range of 
distribution we need not wonder that its range of 
variation is likewise great, and Dr. Claus has pointed 
out (loc. cit.) some of the characters, especially the 
lengths of the antennal joints, which are thus lable 
to vary; 1 have no doubt that a minute examination 
would show great diversity of structure—perhaps even 
some well-marked races or varieties—in the species as 
it exists on our own shores. At one time, indeed, I 
was disposed to think that two or more species had 
been grouped under one name, but further examina- 
tion showed this idea to be untenable, and without 
more time than I had at my disposal it would have 
been impossible to attempt satisfactorily any un- 
ravelling of the complicated problems connected with 
race variation. 
