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 setz of moderate length ; outer segment 
narrow, hastate, with ciliate margin and short ter- 
minal seta ; second joint elongate-ovate, margin ciliated, 
sete six, four moderately long, two short. Last 
three abdominal segments short ; tail segments broad 
and short. Length sy;nd of an inch (1‘1 mm.). Male 
unknown. 
Beside the general build, which is quite different 
from that of the foregoing species, 7’. 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. 
