102 BRITISH COPEPODA. 



developed, while in Nannopus they are obsolete. The 

 second foot-jaw, which in Jurinia is said to be reduced 

 to a few setae only, has not been observed in Nannopus. 

 The specimens were taken in pools of brackish water 

 in a salt marsh at Seaton Sluice, Northumberland, 

 a locality which has yielded many interesting species 

 and which would doubtless well repay an attentive 

 investigation by some naturalist living within easy 

 reach of it. 



Genus 23. PLATYCHELIPUS,* nov. gen. 



Anterior antennas 6-jointed ; secondary branch of the 

 posterior antenna small, 1 -jointed; mandible-palp com- 

 posed of a single 2-jointed branch (PL LXXIX, fig. 20) 

 bearing four apical setas; maxilla (fig. 21) well de- 

 veloped, palp composed of three large setiferous digits ; 

 first foot-jaw (fig. 22) stout, having three large mar- 

 ginal segments, all of which bear short, strong setas ; 

 second pair of foot- jaws (PI. LXXX, fig. 19), forming 

 a clawed prehensile hand. First pair of feet having 

 both branches 2-jointed, the inner elongated and 

 slender, but not forming a clawed hand. Inner branch 

 of the second pair small, 2-jointed, outer branch 

 3-jointed ; the third and fourth pairs have the inner 

 branch reduced to a setiferous tubercle, the outer 

 strong and 3-jointed ; fifth pair, 2-branched, foliaceous. 



This genus agrees very much with Nannopus, but it 



* TrXaritc, broad ; X'A7> claw; TTOVC, foot. 



