229 ON SOME NEW AND RARE COPEPODA FROM THE CLYDE 
shorter than the second joint, and the secondary joints of 
the fifth pair of feet are narrow and of nearly equal width 
throughout ; it is also a larger species. 
Besides /dya minor and Idya furcata, two other species 
of /dya have been obtained in the Clyde district, viz. /dya 
gracilis, T. Scott, and Ldya longicornis, T. and A. Scott. 
Idya gracilis is about twice the length of /dya mznor, 
and is easily distinguished by the remarkably long and slender 
inner branches of the first pair of swimming feet. This species 
was described in part iii. of the “ Thirteenth Annual Report 
of the Fishery Board for Scotland (1895),” from specimens 
obtained in the Firth of Forth. It has not hitherto been 
recorded from the Clyde district, but specimens have now 
been obtained by us in material (chiefly dredged) from one 
or two places in Loch Fyne and in Kilbrennan Sound. 
Idya longicornis is the largest species of /dya known to 
us. It was described in the “ Annals and Magazine of Natural 
History” for June 1895, from specimens discovered in East 
Loch Tarbert (Loch Fyne). It has since been obtained in 
Caradale Bay and a few other Clyde stations, but we know 
of no record for the species beyond the Clyde area. 
CANUELLA PERPLEXA, JZ. and A. Scott. 
This interesting Copepod,so closely resembling Longzpedia 
coronata in general appearance and in several of its structural 
details, and yet differing so much in other points as to make 
it generically distinct, has lately been obtained in some gather- ~ 
ings of Clyde Copepods; it was moderately frequent in 
dredged material from Ayr Bay, and is an addition to the 
Clyde Copepod fauna. Can the close resemblance between © 
Canuella perplexa and Longipedia coronata be considered a 
case of “mimicry” ?: it looks like it. Canuella perplexa was 
described in the “Annals of Scottish Natural History ” for 
April 1893, from specimens obtained in the Firth of Forth ; 
it has also been observed in Liverpool Bay. 
NEOBRADYA PECTINIFER, 7. Scott. 
This was one of a group of peculiarly slender species of 
Copepoda described in the “Tenth Annual Report of the 
Fishery Board for Scotland”; they had been discovered in 
