146 BRITISH COPEPODA. 



foot the outer branch is converted into a stout clasping 

 organ, which is bent across the inner branch, and had 

 its last joint armed with several strong spines. Ovisac 

 single. 



1. HARPACTICUS OHELIFER (Muller). PL LXV, figs. 



115; and PL LXIV, 

 figs. 19, 20. 



(Not Harpacticus chelifer, Lilljeborg.) 



Cyclops chelifer, O. F. Muller. Zool. Dan. Prodr., 2413 ; Ento- 



mostraca, p. 114, taf . xix, figs. 13 (1776). 

 Nauplius Philippi. "Weigmann's Archiv, p. 69 (1843). 

 Arpacticus Baird. Brit. Entomostraca, p. 212, t. xxix, 



figs. 2, 3, 3 a g (1850). 

 Harpacticus Glaus. Die frei-lebenden Copepoden, p. 135, 



t. xix, figs. 1219 (1863). 

 Boeck. Oversigt Norges Copep., p. 37 (1864). 

 ? gracilis, Glaus. Loc. cit., p. 135, taf. xix, fig. 20. 



? elongatus, Boeck. Oversigt Norges Copep., p. 38 



(1864). 



Body elongated, slender, cylindrical, rostrum rather 

 long and curved, reaching beyond the first joint of 

 the anterior antenna. Anterior antennae (PL LXV, 

 fig. 2) elongated, slender, 9- jointed, third and fourth 

 joints longer than the first two, fifth joint short, 

 sixth nearly twice as long, last three very small. 

 Anterior antenna of the male hinged between the 

 fourth and fifth joints, the next two joints forming a 

 corrugated vesiculiform swelling, and terminating in a 

 crooked, claw-like appendage. Inner joint of the 

 posterior antenna (fig. 4) 2-jointed. Mandibles (fig. 5) 

 broad and strong, basal joint of the palp large, and 

 giving attachment to two slender and nearly equal 



