64 BRITISH COPEPODA. 



spine-like setae. Second pair of foot-jaws (fig. 14) 

 powerfully clawed, and armed with four stout curved 

 spines on the inner aspect, one of these springing from 

 near the middle of the second joint. Fifth pair of feet 

 apparently wanting. The shell structure (PI. XCII, 

 fig. 14) exhibits numerous circular elevations, each of 

 which bears a minute seta on its summit. 



This seems to agree with the genus Dyspontius in 

 every respect except that the fourth pair of feet are 

 2-branched. Though it approaches very closely in 

 most of its characters to A. magniceps, it must, I 

 think, be considered quite distinct by virtue of its 

 more densely setose, fewer-jointed, and stouter ante- 

 rior antennae, the median spine of the second joint of 

 the posterior foot-jaw, and the characters of the caudal 

 segments and setse ; the shell-structure, also, and the 

 joints of the swimming-feet, differ somewhat. A few 

 specimens only were dredged on the Durham coast, 

 six miles off Hawthorn, in a depth of twenty- seven 

 fathoms. 



4. ARTOTROGUS LILLJEBORGII, Boeck. 



Asterocheres Lilljeborgii, Boeck. Tvende nye parasitiske Krebsdyr, 

 p. 6, tab. ii, figs. 111 (1859). 



The siphon here is much less elongated than in the 

 foregoing species, the anterior antennae are slender 

 and 18-jointed, and the fifth pair of feet are 2-jointed. 

 The cephalothorax is very wide in proportion to its 

 length. 



