51 



found rather abundantly along the whole Norwegian coast, from the Christiania 

 Fjord to Vadso. It is a true littoral form, occurring in quite shallow water close 

 to the shore, among algae, and not infrequently left in tidal pools together with 

 other littoral species. It moves in a somewhat jerky manner; but it is more 

 frequently found clinging to the algae or other submarine objects. The two sexes 

 are often found tied together in copula, the male having a firm hold of the female 

 by the aid of his powerful clawed anterior antennae, which are inserted within 

 the hind edge of the cephalic segment of the female. 



Distribution. British Isles (Brady), Heligoland (Glaus), coast of Bohuslan 

 (Coll. Cleve), coast of France (Canu), Arctic Ocean (Scott), coast of North America, 

 Ceylon (A. Scott). 



33. Harpaeticus uniremis, Kroyer. 



(PI. XXIX). 

 Harpaeticus uniremis, Kroyer, in Gaimard's Voyage en Scandinavie, PL 43, fig. 1, a p. 



Syn : Harpaeticus nordlandicus, Boeck. 

 chelifer, var. arctica, Poppe. 



Specific- Characters. Female. Body moderately slender, subdepressed, 

 with the greatest width equalling about y 3 of the length, and occurring a little 

 in front of the middle. Cephalic segment rather large, but less deep than in 

 H. chelifer, rostrum broader and more obtuse at the tip. Epimeral plates of the 

 3 succeeding segments somewhat expanded laterally, and acutely produced at the 

 lateral corners. Last segment of metasome rather broad. Urosome gradually 

 somewhat coarctated behind, with the hind edges of the segments coarsely spinulose 

 ventrally. Caudal rami very short, scarcely as long as they are broad, apical 

 setae slender, the innermost but one more than twice as long as the urosome. 

 Anterior antennae moderately slender, 9-articulate, terminal part considerably 

 exceeding half the length of the proximal one. Posterior antennae about as in 

 H. chelifer. Posterior maxillipeds rather strongly built, though not nearly so 

 powerful as in that species, hand rounded oval in form. First pair of legs re- 

 sembling in structure those in H. chelifer, but with a greater number of claws 

 at the tip of the outer ramus. Last pair of legs with the inner expansion of the 

 proximal joint very large and broad, carrying 4 marginal spines, distal joint 

 comparatively smaller. 



Male, as usual, somewhat larger than female, with the urosome narrower 

 and distinctly 5-articulate. Anterior antennae with the dactylus securiform in 

 shape, projecting outside in a strong spiniform process. Outer ramus of 3rd pair 

 of legs somewhat less powerfully developed than in H. chdifer, 1st joint shorter 



