432 MR. G. S. BRADY ON 



terminal setae, first joint of the lower branch enlarged and trun- 

 cate at the distal end. Maxillae composed of four digitate lobes, 

 each bearing four long terminal setae. Lower footjaw stout, 

 with almost entire margins. Joints of swimming feet very broad, 

 subtriangular, much produced at the external distal angle. Ab- 

 domen slender, four jointed, tail setae slender, finely plumose, 

 the longest equal to about twice the length of the abdomen. 

 Length of animal, - 3 Vth of an inch. 



Hab. — Off Seaham Harbour, dredged in a depth of twenty to 

 thirty fathoms. One specimen only taken. 



The characters of this genus are very remarkable and strongly 

 pronounced, especially as regards the fifth pair of feet of the 

 male, which are more complex than anything of the kind hitherto 

 known amongst the Copepoda. Another species referable to the 

 same genus (P. obtusatus, Brady M.S.) was taken abundantly in 

 the surface-net by Mr. D. Eobertson and myself in Roundstone 

 Bay, Ireland, on a calm moonlight night in June of last year. 



Geiius THORELLIA, Boeclc. 

 1. Thorellia brunnea, Boeck. 



T. brunnea, Boeck (1864), Oversigt over de ved Norges 

 Kyster iagt. Copep., p. 26. 



Cyclops nigricauda, Norman (1868), Last Shetland Dredging 

 Report, p. 295. 



One specimen of this species occurred to me amongst fuci, in 

 pools near low-water mark between Ryhope and Sunderland, in 

 the autumn of 1871. Mr. Norman takes it abundantly amongst 

 Laminariae in Shetland, and at Tobermory in Mull. 



The genus differs from Cyclops chiefly in the conformation of 

 the lower footjaw, which is transformed into a four -jointed clawed 

 foot. M. Boeck describes also in the same place another closely 

 allied genus, Misophria, in which the maxillae are formed as in 

 the Harpactidae, but with a strongly developed palp ; the lower 

 footjaws as in Calanus. 



