COPEPODA. 
29 
The first joint of the left foot has a short spine on the external margin, and the 
last joint is broad proximally and foliaceous, and on its inner surface is a row of fine 
bristles, with three or four stiff and longer than the rest. 
EUCALANUS (Dana). 
That any species of Eucalanus should be found at extreme southern latitudes is 
certainly curious. E. elongatus certainly occurs south of lat. 40°, and about 40° W. 
long., ‘ Gauss’ collection ; and in the ‘Discovery’ collection I have found about half a 
dozen examples of a Eucalanus which I regard as a variety of E. subtenuis or mucro- 
natus. This occurred at station marked 21. x. 01, lat. 57° 25|' S., long. 151° §' E., 
and station lat. 56° 31' S., long. 156° 19' 30", 22. xi. 01 ; in both cases a long 
distance outside the Antarctic Circle. 
The 2 (no males were found) is 4 mm. long. The head is very triangular, 
elongated, and produced in front into a blunt point slightly bent downwards; there are 
lateral swellings as in attenuatus, the part behind is not, however, indented. The last 
thoracic segment is rounded. The abdomen has three segments, and one tail bristle on 
the left side is a little thicker and longer than the rest. The genital segment is 
laterally swollen and broader than long. Posterior antennm with first and second 
joints of the exopodite coalesced, the first joint of the endopodite about three times as 
long as broad, and about the same length as Ri 2. The mandibles with very short Ri, 
the proximal part about three times as long as the distal, the whole Ri very much 
shorter than the distal part of the basal, and with four bristles and two short marginal 
bristles. Maxilla, B 2 with five, Ri 1 with four, Ri 2 with four, Ri 3 with five bristles. 
With some resemblance to E. subtenuis, pileatus , and mucronatus, it is larger than any 
of them. The five bristles on the B 2 of the maxilla cause it to differ from either 
mucronatus or subtenuis, and it has considerable differences from pileatus in size, 
posterior antenna and mandible. The shape of the head is certainly not that of 
subtenuis, nor is it so triangular and pointed as mucronatus. 
CTENOCALANUS (Giesbrecht). 
Ctenocalanus vanus. 
Ctenocalanus vanus. Giesbrecht, Atti Acc. Lincei Rend., Ser. 4, 1888, p. 335. 
,, „ „ Fauna u. FI. Neap. XIX. (1892), p. 194. 
This is extremely abundant in the ‘ Discovery ’ collections, but does not differ in 
any material particular from the species well known in the Atlantic. Its range of 
distribution is very great, extending from the Faroe Channel (Wolfenden) throughout 
the Atlantic to the southernmost parts of the Antarctic area, i.e. to the ice region. 
N 2 
