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). 



Tliat 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 1 regard us a variety of E. suhtenuis or miicro- 

 natus. This occurred at station marked 21. x. 01, lat. 57° 25|' B., long. 151° f 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 9 (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 aitenuatus, 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 antennae 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 Bi 2. The mandibles with very short Iii, 

 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, Bi 1 with four, Ri 2 with four, Ri 3 with five bristles. 

 With some resemblance to E. suhtenuis, 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 suhtenuis, and it has considerable differences from pileatus in size, 

 posterior antenna and mandible. The shape of the head is certainly not that of 

 suhtenuis, nor is it so triangular and pointed as mucronatus. 



- CTENOCALANUS (Giesbrecht). 

 Ctenocalanus vanus. 



Otenocahmus vanus. Giesbrecht, Atti Ace. Lincei Rend., Ser. 4, 1888, p. 335. 



Fauna u. Fl. Neap. XIX. (l.s',)2), p. I'.U. 



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 (Wolfeuden) throughout 

 the Atlantic to the southernmost parts of the Antarctic area, i.e. to the ice region. 



N 2 



