38 BRITISH COPEPODA. 



gin ; basal joint of the palp large and broad ; branches 

 densely setose, one 4-, the other 2-jointed. Anterior 

 foot jaws broad and strong; posterior elongated, the 

 terminal portion being divided into five joints ; both 

 pairs armed with numerous strong and long setse. 

 Five pairs of feet adapted for swimming, two-branched, 

 each branch being composed of three joints ; in the 

 male, however, the outer branches of the fifth pair 

 are somewhat modified. Abdomen of the male 5-, of 

 the female 4-jointed. 



1. Calanus finmarchicus {Gunner). PL I, figs. 1 — 12. 



Monoculus finmarchicus, Gunner. Act. Hafn., x, 175, figs. 



20—23 (1765). 

 Cetochilus septentrionalis, Goodsir. Edin. New Phil. Journ., 35, 



p. 339, t. vi, figs. 1—11 (1843). 



— — Baird. Nat. Hist. Brit. Entom., p. 235, 



t. xxx, figs. 1 a — g (1850). 



— helgolandicus, Claus. Die frei lebenden Copepoden, 



p. 171, t. xxvi, figs. 2—9 (1863). 

 Calanus finmarchicus, Boeck. Oversigt over de ved Norges Kyster 

 iagttagne Copepoder, p. 8 (1864). 



— — Brady. Nat. Hist. Trans. Northumberland 



and Durham, vol. iv, p. 424 (1872). 



— magnus, borealis, and elegans, Lubbock. Ann. and Mag. 



Nat. Hist., 2nd series, vol. 

 xiv (Aug. 1854). 



Anterior antennae about as long as the body (figs. 



2, 12), the twenty-third and twenty-fourth joints 

 bearing, the one at the apex, the other near the middle, 

 a long whip-like hair which is ringed and densely 

 ciliated ; in the male these hairs are more slender. 

 Posterior antennas two-branched (fig. 3), the outer 



