CTCLOPINA. 91 



apex, with numerous very long setge ; rostrum (PI. XIV, 

 fig. 1) small, pointed, and slender ; abdomen extremely 

 long and slender ; second joint long, third and fifth of 

 moderate length and about equal, fourth somewhat 

 shorter ; tail segments shorter than any of the abdo- 

 minal joints. Two median tail setae of nearly equal 

 length and about as long as the abdomen ; a small seta 

 attached near the base of external margin of caudal 

 segments. Length -^th of an inch (*85 mm.). 



I have found this species in many gatherings from 

 various parts of the British seas ; but, owing to the 

 minuteness, together with the extreme delicacy and 

 transparency, of the animal, have found it very difficult 

 to dissect and examine satisfactorily. I think there 

 can be little doubt of the identity of the species with 

 Boeck's 0. spinifrons, but I am not at all satisfied that 

 this is not synonymous with 0. helgolandica, Claus. 



The following are some of the localities in which it has 

 been observed : in the North Sea off Sunderland, Whitby 

 and Bridlington, and in the Firth of Forth ; off Cumbrae 

 in the Firth of Clyde ; off the Skelligs, and in West- 

 port Bay, Kinsale and Yalentia Harbours, Ireland. So 

 far as I know it haunts exclusively the surface of the 

 sea, being taken only in the towing-net. 



Genus 2. CYCLOPINA, Claus (1863). 



(Die frei-lebenden Copepoden p. 103, 1863.) 



Body elongated and cyclopoid in form. First pair of 



