50 BRITISH COPEPODA. 



branch strongly pectinated on the outer and densely 

 hairy on the inner margin (fig. 8) ; these spines and the 

 plumes of the swimming setae deeply coloured. 

 Fifth pair of feet in the female simple, three-jointed ; 

 terminal joint long and curved, tapering to the ex- 

 tremity, which is sharp and twice dentated on the 

 outer margin. Fifth pair in the male one-branched, 

 that of the left side simple, four- jointed ; the right 

 having the last two joints modified into prehensile 

 form (fig. 10). Last joint of the thorax in the male 

 produced at one side into a long spine ; first abdominal 

 segment produced in a similar way, but on the opposite 

 side (fig. 11). Caudal segments very short; setae about 

 as long as the abdomen. Length of the animal ^th of 

 an inch (2'3 mm.). 



A very few specimens of this interesting species 

 were dredged by Mr. Robertson and myself in June, 

 1873, on very hard ground and in a depth of about 

 forty fathoms, south-west of the island of St. Agnes, 

 Scilly. It appears to be quite distinct from any species 

 described by Dana, Kroyer, Claus, or Boeck, though 

 the female antennas very nearly agree with those of G. 

 longimana, Claus. 



Genus 5. DIAS, Lilljeborq (18o3) 



(Acartia, Dana, in part.) 



Body long and slender, head narrowed above and 

 produced into a slender rostrum. Abdomen consisting 

 in the male of five, in the female of three segments. 



