64 BRITISH COPEPODA. 



generally distributed in the British seas, but nowhere 

 occurs in any great abundance. The localities from 

 which I have specimens are as follows : Off Robin 

 Hood's Bay, Yorkshire, dredged in 35 fathoms ; dredged 

 off Portincross, Ayrshire (20 fathoms) ; off Cumbrae 

 (15 fathoms), in Lough Swilly, Ireland, (3 fathoms) ; 

 taken in the surface-net at Cumbrae, Bridlington Bay, 

 and at Killybegs, Donegal (Mr. E. C. Damson) ; and 

 amongst fuci in Clifden and Roundstone Bays, Ireland. 



Genus 9. CENTROPAGES, Kroyer (1849). 



(Ichthyophorba, Lilljeborg. Calanopia, Dana. ? Catopia, Dana.) 



Body elongated. Head distinct from thorax, more 

 or less distinctly divided by a groove into two seg- 

 ments, and produced into a cloven rostrum. Abdo- 

 men composed of five segments in the male, of three 

 in the female. Anterior antennae 24-jointed, that of 

 the right side in the male geniculated and prehensile. 

 Mouth organs as in Calanus, except that the anterior 

 footjaws are armed with strong bristles as in Pontella. 

 Both branches of the first four pairs of feet 3-jointed ; 

 outer branch of the right fifth pair in the male pre- 

 hensile, internal branch adapted for swimming. Eye 

 median and movable. 



