102 BRITISH GCOPEPODA. 
developed, while in Nannopus they are obsolete. The 
second foot-jaw, which in Jurinia is said to be reduced 
to afew setz 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 hving within easy 
reach of it. 
Genus 23. PLATYCHELIPUS,* nov. gen. 
Anterior antenne 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 sete; 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 sete ; 
second pair of foot-jaws (Pl. LXXX, fig. 19), forming 
a clawed prehensile hand. First pair of feet having 
both branches 2-jointed, the imner elongated and 
slender, but not forming a clawed hand. Inner branch 
of the second pair small, 2-joimted, 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 
* grarde, broad; xn\7, claw; ove, foot. 
