124 BRITISH COPEPODA. 



slender, 9-jointed; inner branch of the posterior antenna 

 broad, 3-jointed (fig. 10). Basal joint of the mandible- 

 palp almost quadrate. Hand of the second foot-jaw 

 almost exactly like that of the preceding species (fig. 

 11). Branches of the first pair of feet (fig. 12) elon- 

 gated, the inner rather the shorter. Basal joint of 

 the fifth pair of feet in the female broad, triangular, 

 its inner segment (fig. 14 a) tapering to the apex and 

 bearing four setae of moderate length ; outer segment 

 narrow, hastate, with ciliate margin and short ter- 

 minal seta ; second joint elongate-ovate, margin ciliated, 

 setae six, four moderately long, two short. Last 

 three abdominal segments short ; tail segments broad 

 and short. Length -^ud of an inch (1*1 mm.). Male 

 unknown. 



Beside the general build, which is quite different 

 from that of the foregoing species, T. helgolandica is 

 well separated from all others by the characters of the 

 fifth pair of feet ; these, taken together with the 3- 

 jointed inner branch of the second antenna and the 

 absence of a rugose epidermis, form sufficient diagnostic 

 marks. It seems to be one of the rarer British species. 

 The Rev. A. M. Norman has found it at Oban and in 

 Bressay Sound, Shetland. I have myself dredged it 

 off the Durham Coast, in a depth of twenty-seven 

 fathoms, very sparingly, and in rather more abundance 

 off Port Dinlleyn, Carnarvonshire, in ten fathoms. 



