54 BRITISH COPEPODA. 



branches of the first, second, third, and fourth pairs 

 of feet two-jointed. The fifth pair are composed 

 each of one branch, those of the male forming clasping 

 organs. Abdomen of the female three-, of the male 

 four-jointed. 



1. Temora longicornis, Miiller, PI. Ill, figs. 10 — 19. 



Cyclops longicornis, Miiller. Entomostraca p. 115, t. xix, figs. 



7—9 (1785). 

 Temora finmarchica, Baird. Brit. Entom. p. 228, t. xxviii, figs. 1 

 a— g (1850). 



— — Claus. Die frei-leb. Copep., p. 195, t. xxxiv, 



figs. 1—11 (1863). 



— — Brady. Nat. Hist. Trans. Northumberland 



and Durham, vol. i, p. 36, pi. i, fig. 15, and 

 pi. ii, figs. 1—10 (1865). 



— longicornis, Boeck. Loc. cit., p. 15 (1865). 



— — Brady. Nat. Hist. Trans. Northumberland 



and Durham, vol. iv, p. 425 (1872). 

 Diaptomus longicaudatus, Lubbock. Ann. and Mag. Nat. Hist., 



ser. 2, vol. xx pi. x, figs. 11 and 12 

 and pi. xi, figs. 12 and 13 (not Mono- 

 culus finmarchicus, Gunner) (1857). 



Body wide in proportion to its length, dorsal margin 

 much arched, posterior dorsal angle rounded off, 

 ventral produced and subangular. Anterior antennae 

 (fig. 12) rather longer than the cephalothorax, twenty- 

 five-jointed, the segments more attenuated and 

 increasing slightly in length towards the distal 

 extremity, the basal joint, however, being the largest of 

 all ; each segment bears two short slender hairs at its 

 apex. The right antenna of the male (fig. 11) has a 



