38 BRITISH COPEPODA. 



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

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

 footjaws broad and strong; posterior elongated, the 

 terminal portion being divided into five joints ; both 

 pairs armed with numerous strong and long setae. 

 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). PI. I, figs. 112. 



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



2023 (1765). 

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



p. 339, t. vi, figs. 111 (1843). 

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



t. xxx, figs. 1 a g (1850). 

 helgolandicus, Glaus. Die frei lebenden Copepoden, 



p. 171, t. xxvi, figs. 29 (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 antennae two-branched (fig. 3), the outer 



