104 BRITISH COPEPODA. 



third, and fourth pairs are 3- jointed and bordered 

 with chitinous plates, their marginal spines extremely 

 stout, and in length much exceeding the width of the 

 limb; the last joint has at the apex two long and 

 much more slender spines. Basal joint of the fifth pair 

 produced into a large quadrangular internal segment, 

 which has four apical spines and a few small cilia 

 (fig. 18) ; second joint smaller, subovate, its external 

 margin divided into five setas. 



Several examples of this very distinct species were 

 noticed in a gathering from between tide-marks at 

 Lake Lothing, Suffolk, where the water of Oulton 

 Broad finds its way to the sea. Though the gather- 

 ing was made amongst the fronds of Fuel the water 

 would no doubt be brackish. I have more recently 

 found a few examples at Seaton Sluice, in the brackish 

 pools which have been spoken of in connection with 

 Nannopus palustris and other species. 



Sub-family 7. HAEPACTICIN^, BoecJc (in part). 



Body cylindrical, or, less commonly, broad and de- 

 pressed. First pair of antennas 5 9-jointed ; secondary 

 branch of second pair 2- or 3 -jointed. Mandible- 

 palp 2-branched, usually largely developed. First 

 foot- jaw triangular, not chelate ; with several digi- 

 tate marginal processes, second foot-jaw forming a 

 strong clawed hand; outer branch of the first pair 

 of feet always, inner branch usually, clawed and 



