ON SOME NEW AND RARE COPEPODA FROM THE CLYDE 229 



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 Idya minor and Idya furcata, two other species 

 of Idya have been obtained in the Clyde district, viz. Idya 

 gracilis, T. Scott, and Idya longicornis, T. and A. Scott. 



Idya gracilis is about twice the length of Idya minor, 

 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 Idya 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, 7! and A. Scott. 



This interesting Copepod,so closely resembling Longipedia 

 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, T. 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 



